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// Copyright (c) 2014 The Chromium Authors. All rights reserved.
2.// Use of this source code is governed by a BSD-style license that can be
3.// found in the LICENSE file.
4.(function() {
5.'use strict';
6./**
7. * T-Rex runner.
8. * @param {string} outerContainerId Outer containing element id.
9. * @param {object} opt_config
10. * @constructor
11. * @export
12. */
13.function Runner(outerContainerId, opt_config) {
14. // Singleton
15. if (Runner.instance_) {
16. return Runner.instance_;
17. }
18. Runner.instance_ = this;
19.
20. this.outerContainerEl = document.querySelector(outerContainerId);
21. this.containerEl = null;
22. this.detailsButton = this.outerContainerEl.querySelector('#details-button');
23.
24. this.config = opt_config || Runner.config;
25.
26. this.dimensions = Runner.defaultDimensions;
27.
28. this.canvas = null;
29. this.canvasCtx = null;
30.
31. this.tRex = null;
32.
33. this.distanceMeter = null;
34. this.distanceRan = 0;
35.
36. this.highestScore = 0;
37.
38. this.time = 0;
39. this.runningTime = 0;
40. this.msPerFrame = 1000 / FPS;
41. this.currentSpeed = this.config.SPEED;
42.
43. this.obstacles = [];
44.
45. this.started = false;
46. this.activated = false;
47. this.crashed = false;
48. this.paused = false;
49.
50. this.resizeTimerId_ = null;
51.
52. this.playCount = 0;
53.
54. // Sound FX.
55. this.audioBuffer = null;
56. this.soundFx = {};
57.
58. // Global web audio context for playing sounds.
59. this.audioContext = null;
60.
61. // Images.
62. this.images = {};
63. this.imagesLoaded = 0;
64. this.loadImages();
65.}
66.window['Runner'] = Runner;
67.
68.
69./**
70. * Default game width.
71. * @const
72. */
73.var DEFAULT_WIDTH = 600;
74.
75./**
76. * Frames per second.
77. * @const
78. */
79.var FPS = 60;
80.
81./** @const */
82.var IS_HIDPI = window.devicePixelRatio > 1;
83.
84./** @const */
85.var IS_IOS =
86. window.navigator.userAgent.indexOf('UIWebViewForStaticFileContent') > -1;
87.
88./** @const */
89.var IS_MOBILE = window.navigator.userAgent.indexOf('Mobi') > -1 || IS_IOS;
90.
91./** @const */
92.var IS_TOUCH_ENABLED = 'ontouchstart' in window;
93.
94./**
95. * Default game configuration.
96. * @enum {number}
97. */
98.Runner.config = {
99. ACCELERATION: 0.001,
100. BG_CLOUD_SPEED: 0.2,
101. BOTTOM_PAD: 10,
102. CLEAR_TIME: 3000,
103. CLOUD_FREQUENCY: 0.5,
104. GAMEOVER_CLEAR_TIME: 750,
105. GAP_COEFFICIENT: 0.6,
106. GRAVITY: 0.6,
107. INITIAL_JUMP_VELOCITY: 12,
108. MAX_CLOUDS: 6,
109. MAX_OBSTACLE_LENGTH: 3,
110. MAX_SPEED: 12,
111. MIN_JUMP_HEIGHT: 35,
112. MOBILE_SPEED_COEFFICIENT: 1.2,
113. RESOURCE_TEMPLATE_ID: 'audio-resources',
114. SPEED: 6,
115. SPEED_DROP_COEFFICIENT: 3
116.};
117.
118.
119./**
120. * Default dimensions.
121. * @enum {string}
122. */
123.Runner.defaultDimensions = {
124. WIDTH: DEFAULT_WIDTH,
125. HEIGHT: 150
126.};
127.
128.
129./**
130. * CSS class names.
131. * @enum {string}
132. */
133.Runner.classes = {
134. CANVAS: 'runner-canvas',
135. CONTAINER: 'runner-container',
136. CRASHED: 'crashed',
137. ICON: 'icon-offline',
138. TOUCH_CONTROLLER: 'controller'
139.};
140.
141.
142./**
143. * Image source urls.
144. * @enum {array.<object>}
145. */
146.Runner.imageSources = {
147. LDPI: [
148. {name: 'CACTUS_LARGE', id: '1x-obstacle-large'},
149. {name: 'CACTUS_SMALL', id: '1x-obstacle-small'},
150. {name: 'CLOUD', id: '1x-cloud'},
151. {name: 'HORIZON', id: '1x-horizon'},
152. {name: 'RESTART', id: '1x-restart'},
153. {name: 'TEXT_SPRITE', id: '1x-text'},
154. {name: 'TREX', id: '1x-trex'}
155. ],
156. HDPI: [
157. {name: 'CACTUS_LARGE', id: '2x-obstacle-large'},
158. {name: 'CACTUS_SMALL', id: '2x-obstacle-small'},
159. {name: 'CLOUD', id: '2x-cloud'},
160. {name: 'HORIZON', id: '2x-horizon'},
161. {name: 'RESTART', id: '2x-restart'},
162. {name: 'TEXT_SPRITE', id: '2x-text'},
163. {name: 'TREX', id: '2x-trex'}
164. ]
165.};
166.
167.
168./**
169. * Sound FX. Reference to the ID of the audio tag on interstitial page.
170. * @enum {string}
171. */
172.Runner.sounds = {
173. BUTTON_PRESS: 'offline-sound-press',
174. HIT: 'offline-sound-hit',
175. SCORE: 'offline-sound-reached'
176.};
177.
178.
179./**
180. * Key code mapping.
181. * @enum {object}
182. */
183.Runner.keycodes = {
184. JUMP: {'38': 1, '32': 1}, // Up, spacebar
185. DUCK: {'40': 1}, // Down
186. RESTART: {'13': 1} // Enter
187.};
188.
189.
190./**
191. * Runner event names.
192. * @enum {string}
193. */
194.Runner.events = {
195. ANIM_END: 'webkitAnimationEnd',
196. CLICK: 'click',
197. KEYDOWN: 'keydown',
198. KEYUP: 'keyup',
199. MOUSEDOWN: 'mousedown',
200. MOUSEUP: 'mouseup',
201. RESIZE: 'resize',
202. TOUCHEND: 'touchend',
203. TOUCHSTART: 'touchstart',
204. VISIBILITY: 'visibilitychange',
205. BLUR: 'blur',
206. FOCUS: 'focus',
207. LOAD: 'load'
208.};
209.
210.
211.Runner.prototype = {
212. /**
213. * Setting individual settings for debugging.
214. * @param {string} setting
215. * @param {*} value
216. */
217. updateConfigSetting: function(setting, value) {
218. if (setting in this.config && value != undefined) {
219. this.config[setting] = value;
220.
221. switch (setting) {
222. case 'GRAVITY':
223. case 'MIN_JUMP_HEIGHT':
224. case 'SPEED_DROP_COEFFICIENT':
225. this.tRex.config[setting] = value;
226. break;
227. case 'INITIAL_JUMP_VELOCITY':
228. this.tRex.setJumpVelocity(value);
229. break;
230. case 'SPEED':
231. this.setSpeed(value);
232. break;
233. }
234. }
235. },
236.
237. /**
238. * Load and cache the image assets from the page.
239. */
240. loadImages: function() {
241. var imageSources = IS_HIDPI ? Runner.imageSources.HDPI :
242. Runner.imageSources.LDPI;
243.
244. var numImages = imageSources.length;
245.
246. for (var i = numImages - 1; i >= 0; i--) {
247. var imgSource = imageSources;
248. this.images[imgSource.name] = document.getElementById(imgSource.id);
249. }
250. this.init();
251. },
252.
253. /**
254. * Load and decode base 64 encoded sounds.
255. */
256. loadSounds: function() {
257. if (!IS_IOS) {
258. this.audioContext = new AudioContext();
259. var resourceTemplate =
260. document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
261.
262. for (var sound in Runner.sounds) {
263. var soundSrc =
264. resourceTemplate.getElementById(Runner.sounds[sound]).src;
265. soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
266. var buffer = decodeBase64ToArrayBuffer(soundSrc);
267.
268. // Async, so no guarantee of order in array.
269. this.audioContext.decodeAudioData(buffer, function(index, audioData) {
270. this.soundFx[index] = audioData;
271. }.bind(this, sound));
272. }
273. }
274. },
275.
276. /**
277. * Sets the game speed. Adjust the speed accordingly if on a smaller screen.
278. * @param {number} opt_speed
279. */
280. setSpeed: function(opt_speed) {
281. var speed = opt_speed || this.currentSpeed;
282.
283. // Reduce the speed on smaller mobile screens.
284. if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
285. var mobileSpeed = speed * this.dimensions.WIDTH / DEFAULT_WIDTH *
286. this.config.MOBILE_SPEED_COEFFICIENT;
287. this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed;
288. } else if (opt_speed) {
289. this.currentSpeed = opt_speed;
290. }
291. },
292.
293. /**
294. * Game initialiser.
295. */
296. init: function() {
297. // Hide the static icon.
298. document.querySelector('.' + Runner.classes.ICON).style.visibility =
299. 'hidden';
300.
301. this.adjustDimensions();
302. this.setSpeed();
303.
304. this.containerEl = document.createElement('div');
305. this.containerEl.className = Runner.classes.CONTAINER;
306.
307. // Player canvas container.
308. this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
309. this.dimensions.HEIGHT, Runner.classes.PLAYER);
310.
311. this.canvasCtx = this.canvas.getContext('2d');
312. this.canvasCtx.fillStyle = '#f7f7f7';
313. this.canvasCtx.fill();
314. Runner.updateCanvasScaling(this.canvas);
315.
316. // Horizon contains clouds, obstacles and the ground.
317. this.horizon = new Horizon(this.canvas, this.images, this.dimensions,
318. this.config.GAP_COEFFICIENT);
319.
320. // Distance meter
321. this.distanceMeter = new DistanceMeter(this.canvas,
322. this.images.TEXT_SPRITE, this.dimensions.WIDTH);
323.
324. // Draw t-rex
325. this.tRex = new Trex(this.canvas, this.images.TREX);
326.
327. this.outerContainerEl.appendChild(this.containerEl);
328.
329. if (IS_MOBILE) {
330. this.createTouchController();
331. }
332.
333. this.startListening();
334. this.update();
335.
336. window.addEventListener(Runner.events.RESIZE,
337. this.debounceResize.bind(this));
338. },
339.
340. /**
341. * Create the touch controller. A div that covers whole screen.
342. */
343. createTouchController: function() {
344. this.touchController = document.createElement('div');
345. this.touchController.className = Runner.classes.TOUCH_CONTROLLER;
346. },
347.
348. /**
349. * Debounce the resize event.
350. */
351. debounceResize: function() {
352. if (!this.resizeTimerId_) {
353. this.resizeTimerId_ =
354. setInterval(this.adjustDimensions.bind(this), 250);
355. }
356. },
357.
358. /**
359. * Adjust game space dimensions on resize.
360. */
361. adjustDimensions: function() {
362. clearInterval(this.resizeTimerId_);
363. this.resizeTimerId_ = null;
364.
365. var boxStyles = window.getComputedStyle(this.outerContainerEl);
366. var padding = Number(boxStyles.paddingLeft.substr(0,
367. boxStyles.paddingLeft.length - 2));
368.
369. this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
370.
371. // Redraw the elements back onto the canvas.
372. if (this.canvas) {
373. this.canvas.width = this.dimensions.WIDTH;
374. this.canvas.height = this.dimensions.HEIGHT;
375.
376. Runner.updateCanvasScaling(this.canvas);
377.
378. this.distanceMeter.calcXPos(this.dimensions.WIDTH);
379. this.clearCanvas();
380. this.horizon.update(0, 0, true);
381. this.tRex.update(0);
382.
383. // Outer container and distance meter.
384. if (this.activated || this.crashed) {
385. this.containerEl.style.width = this.dimensions.WIDTH + 'px';
386. this.containerEl.style.height = this.dimensions.HEIGHT + 'px';
387. this.distanceMeter.update(0, Math.ceil(this.distanceRan));
388. this.stop();
389. } else {
390. this.tRex.draw(0, 0);
391. }
392.
393. // Game over panel.
394. if (this.crashed && this.gameOverPanel) {
395. this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
396. this.gameOverPanel.draw();
397. }
398. }
399. },
400.
401. /**
402. * Play the game intro.
403. * Canvas container width expands out to the full width.
404. */
405. playIntro: function() {
406. if (!this.started && !this.crashed) {
407. this.playingIntro = true;
408. this.tRex.playingIntro = true;
409.
410. // CSS animation definition.
411. var keyframes = '@-webkit-keyframes intro { ' +
412. 'from { width:' + Trex.config.WIDTH + 'px }' +
413. 'to { width: ' + this.dimensions.WIDTH + 'px }' +
414. '}';
415. document.styleSheets[0].insertRule(keyframes, 0);
416.
417. this.containerEl.addEventListener(Runner.events.ANIM_END,
418. this.startGame.bind(this));
419.
420. this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';
421. this.containerEl.style.width = this.dimensions.WIDTH + 'px';
422.
423. if (this.touchController) {
424. this.outerContainerEl.appendChild(this.touchController);
425. }
426. this.activated = true;
427. this.started = true;
428. } else if (this.crashed) {
429. this.restart();
430. }
431. },
432.
433.
434. /**
435. * Update the game status to started.
436. */
437. startGame: function() {
438. this.runningTime = 0;
439. this.playingIntro = false;
440. this.tRex.playingIntro = false;
441. this.containerEl.style.webkitAnimation = '';
442. this.playCount++;
443.
444. // Handle tabbing off the page. Pause the current game.
445. window.addEventListener(Runner.events.VISIBILITY,
446. this.onVisibilityChange.bind(this));
447.
448. window.addEventListener(Runner.events.BLUR,
449. this.onVisibilityChange.bind(this));
450.
451. window.addEventListener(Runner.events.FOCUS,
452. this.onVisibilityChange.bind(this));
453. },
454.
455. clearCanvas: function() {
456. this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH,
457. this.dimensions.HEIGHT);
458. },
459.
460. /**
461. * Update the game frame.
462. */
463. update: function() {
464. this.drawPending = false;
465.
466. var now = getTimeStamp();
467. var deltaTime = now - (this.time || now);
468. this.time = now;
469.
470. if (this.activated) {
471. this.clearCanvas();
472.
473. if (this.tRex.jumping) {
474. this.tRex.updateJump(deltaTime, this.config);
475. }
476.
477. this.runningTime += deltaTime;
478. var hasObstacles = this.runningTime > this.config.CLEAR_TIME;
479.
480. // First jump triggers the intro.
481. if (this.tRex.jumpCount == 1 && !this.playingIntro) {
482. this.playIntro();
483. }
484.
485. // The horizon doesn't move until the intro is over.
486. if (this.playingIntro) {
487. this.horizon.update(0, this.currentSpeed, hasObstacles);
488. } else {
489. deltaTime = !this.started ? 0 : deltaTime;
490. this.horizon.update(deltaTime, this.currentSpeed, hasObstacles);
491. }
492.
493. // Check for collisions.
494. var collision = hasObstacles &&
495. checkForCollision(this.horizon.obstacles[0], this.tRex);
496.
497. if (!collision) {
498. this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
499.
500. if (this.currentSpeed < this.config.MAX_SPEED) {
501. this.currentSpeed += this.config.ACCELERATION;
502. }
503. } else {
504. this.gameOver();
505. }
506.
507. if (this.distanceMeter.getActualDistance(this.distanceRan) >
508. this.distanceMeter.maxScore) {
509. this.distanceRan = 0;
510. }
511.
512. var playAcheivementSound = this.distanceMeter.update(deltaTime,
513. Math.ceil(this.distanceRan));
514.
515. if (playAcheivementSound) {
516. this.playSound(this.soundFx.SCORE);
517. }
518. }
519.
520. if (!this.crashed) {
521. this.tRex.update(deltaTime);
522. this.raq();
523. }
524. },
525.
526. /**
527. * Event handler.
528. */
529. handleEvent: function(e) {
530. return (function(evtType, events) {
531. switch (evtType) {
532. case events.KEYDOWN:
533. case events.TOUCHSTART:
534. case events.MOUSEDOWN:
535. this.onKeyDown(e);
536. break;
537. case events.KEYUP:
538. case events.TOUCHEND:
539. case events.MOUSEUP:
540. this.onKeyUp(e);
541. break;
542. }
543. }.bind(this))(e.type, Runner.events);
544. },
545.
546. /**
547. * Bind relevant key / mouse / touch listeners.
548. */
549. startListening: function() {
550. // Keys.
551. document.addEventListener(Runner.events.KEYDOWN, this);
552. document.addEventListener(Runner.events.KEYUP, this);
553.
554. if (IS_MOBILE) {
555. // Mobile only touch devices.
556. this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
557. this.touchController.addEventListener(Runner.events.TOUCHEND, this);
558. this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);
559. } else {
560. // Mouse.
561. document.addEventListener(Runner.events.MOUSEDOWN, this);
562. document.addEventListener(Runner.events.MOUSEUP, this);
563. }
564. },
565.
566. /**
567. * Remove all listeners.
568. */
569. stopListening: function() {
570. document.removeEventListener(Runner.events.KEYDOWN, this);
571. document.removeEventListener(Runner.events.KEYUP, this);
572.
573. if (IS_MOBILE) {
574. this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);
575. this.touchController.removeEventListener(Runner.events.TOUCHEND, this);
576. this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);
577. } else {
578. document.removeEventListener(Runner.events.MOUSEDOWN, this);
579. document.removeEventListener(Runner.events.MOUSEUP, this);
580. }
581. },
582.
583. /**
584. * Process keydown.
585. * @param {Event} e
586. */
587. onKeyDown: function(e) {
588. if (e.target != this.detailsButton) {
589. if (!this.crashed && (Runner.keycodes.JUMP[String(e.keyCode)] ||
590. e.type == Runner.events.TOUCHSTART)) {
591. if (!this.activated) {
592. this.loadSounds();
593. this.activated = true;
594. }
595.
596. if (!this.tRex.jumping) {
597. this.playSound(this.soundFx.BUTTON_PRESS);
598. this.tRex.startJump();
599. }
600. }
601.
602. if (this.crashed && e.type == Runner.events.TOUCHSTART &&
603. e.currentTarget == this.containerEl) {
604. this.restart();
605. }
606. }
607.
608. // Speed drop, activated only when jump key is not pressed.
609. if (Runner.keycodes.DUCK[e.keyCode] && this.tRex.jumping) {
610. e.preventDefault();
611. this.tRex.setSpeedDrop();
612. }
613. },
614.
615.
616. /**
617. * Process key up.
618. * @param {Event} e
619. */
620. onKeyUp: function(e) {
621. var keyCode = String(e.keyCode);
622. var isjumpKey = Runner.keycodes.JUMP[keyCode] ||
623. e.type == Runner.events.TOUCHEND ||
624. e.type == Runner.events.MOUSEDOWN;
625.
626. if (this.isRunning() && isjumpKey) {
627. this.tRex.endJump();
628. } else if (Runner.keycodes.DUCK[keyCode]) {
629. this.tRex.speedDrop = false;
630. } else if (this.crashed) {
631. // Check that enough time has elapsed before allowing jump key to restart.
632. var deltaTime = getTimeStamp() - this.time;
633.
634. if (Runner.keycodes.RESTART[keyCode] ||
635. (e.type == Runner.events.MOUSEUP && e.target == this.canvas) ||
636. (deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
637. Runner.keycodes.JUMP[keyCode])) {
638. this.restart();
639. }
640. } else if (this.paused && isjumpKey) {
641. this.play();
642. }
643. },
644.
645. /**
646. * RequestAnimationFrame wrapper.
647. */
648. raq: function() {
649. if (!this.drawPending) {
650. this.drawPending = true;
651. this.raqId = requestAnimationFrame(this.update.bind(this));
652. }
653. },
654.
655. /**
656. * Whether the game is running.
657. * @return {boolean}
658. */
659. isRunning: function() {
660. return !!this.raqId;
661. },
662.
663. /**
664. * Game over state.
665. */
666. gameOver: function() {
667. this.playSound(this.soundFx.HIT);
668. vibrate(200);
669.
670. this.stop();
671. this.crashed = true;
672. this.distanceMeter.acheivement = false;
673.
674. this.tRex.update(100, Trex.status.CRASHED);
675.
676. // Game over panel.
677. if (!this.gameOverPanel) {
678. this.gameOverPanel = new GameOverPanel(this.canvas,
679. this.images.TEXT_SPRITE, this.images.RESTART,
680. this.dimensions);
681. } else {
682. this.gameOverPanel.draw();
683. }
684.
685. // Update the high score.
686. if (this.distanceRan > this.highestScore) {
687. this.highestScore = Math.ceil(this.distanceRan);
688. this.distanceMeter.setHighScore(this.highestScore);
689. }
690.
691. // Reset the time clock.
692. this.time = getTimeStamp();
693. },
694.
695. stop: function() {
696. this.activated = false;
697. this.paused = true;
698. cancelAnimationFrame(this.raqId);
699. this.raqId = 0;
700. },
701.
702. play: function() {
703. if (!this.crashed) {
704. this.activated = true;
705. this.paused = false;
706. this.tRex.update(0, Trex.status.RUNNING);
707. this.time = getTimeStamp();
708. this.update();
709. }
710. },
711.
712. restart: function() {
713. if (!this.raqId) {
714. this.playCount++;
715. this.runningTime = 0;
716. this.activated = true;
717. this.crashed = false;
718. this.distanceRan = 0;
719. this.setSpeed(this.config.SPEED);
720.
721. this.time = getTimeStamp();
722. this.containerEl.classList.remove(Runner.classes.CRASHED);
723. this.clearCanvas();
724. this.distanceMeter.reset(this.highestScore);
725. this.horizon.reset();
726. this.tRex.reset();
727. this.playSound(this.soundFx.BUTTON_PRESS);
728.
729. this.update();
730. }
731. },
732.
733. /**
734. * Pause the game if the tab is not in focus.
735. */
736. onVisibilityChange: function(e) {
737. if (document.hidden || document.webkitHidden || e.type == 'blur') {
738. this.stop();
739. } else {
740. this.play();
741. }
742. },
743.
744. /**
745. * Play a sound.
746. * @param {SoundBuffer} soundBuffer
747. */
748. playSound: function(soundBuffer) {
749. if (soundBuffer) {
750. var sourceNode = this.audioContext.createBufferSource();
751. sourceNode.buffer = soundBuffer;
752. sourceNode.connect(this.audioContext.destination);
753. sourceNode.start(0);
754. }
755. }
756.};
757.
758.
759./**
760. * Updates the canvas size taking into
761. * account the backing store pixel ratio and
762. * the device pixel ratio.
763. *
764. * See article by Paul Lewis:
765. *http://www.html5rocks.com/en/tutorials/canvas/hidpi/
766. *
767. * @param {HTMLCanvasElement} canvas
768. * @param {number} opt_width
769. * @param {number} opt_height
770. * @return {boolean} Whether the canvas was scaled.
771. */
772.Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {
773. var context = canvas.getContext('2d');
774.
775. // Query the various pixel ratios
776. var devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
777. var backingStoreRatio = Math.floor(context.webkitBackingStorePixelRatio) || 1;
778. var ratio = devicePixelRatio / backingStoreRatio;
779.
780. // Upscale the canvas if the two ratios don't match
781. if (devicePixelRatio !== backingStoreRatio) {
782.
783. var oldWidth = opt_width || canvas.width;
784. var oldHeight = opt_height || canvas.height;
785.
786. canvas.width = oldWidth * ratio;
787. canvas.height = oldHeight * ratio;
788.
789. canvas.style.width = oldWidth + 'px';
790. canvas.style.height = oldHeight + 'px';
791.
792. // Scale the context to counter the fact that we've manually scaled
793. // our canvas element.
794. context.scale(ratio, ratio);
795. return true;
796. }
797. return false;
798.};
799.
800.
801./**
802. * Get random number.
803. * @param {number} min
804. * @param {number} max
805. * @param {number}
806. */
807.function getRandomNum(min, max) {
808. return Math.floor(Math.random() * (max - min + 1)) + min;
809.}
810.
811.
812./**
813. * Vibrate on mobile devices.
814. * @param {number} duration Duration of the vibration in milliseconds.
815. */
816.function vibrate(duration) {
817. if (IS_MOBILE && window.navigator.vibrate) {
818. window.navigator.vibrate(duration);
819. }
820.}
821.
822.
823./**
824. * Create canvas element.
825. * @param {HTMLElement} container Element to append canvas to.
826. * @param {number} width
827. * @param {number} height
828. * @param {string} opt_classname
829. * @return {HTMLCanvasElement}
830. */
831.function createCanvas(container, width, height, opt_classname) {
832. var canvas = document.createElement('canvas');
833. canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' +
834. opt_classname : Runner.classes.CANVAS;
835. canvas.width = width;
836. canvas.height = height;
837. container.appendChild(canvas);
838.
839. return canvas;
840.}
841.
842.
843./**
844. * Decodes the base 64 audio to ArrayBuffer used by Web Audio.
845. * @param {string} base64String
846. */
847.function decodeBase64ToArrayBuffer(base64String) {
848. var len = (base64String.length / 4) * 3;
849. var str = atob(base64String);
850. var arrayBuffer = new ArrayBuffer(len);
851. var bytes = new Uint8Array(arrayBuffer);
852.
853. for (var i = 0; i < len; i++) {
854. bytes = str.charCodeAt(i);
855. }
856. return bytes.buffer;
857.}
858.
859.
860./**
861. * Return the current timestamp.
862. * @return {number}
863. */
864.function getTimeStamp() {
865. return IS_IOS ? new Date().getTime() : performance.now();
866.}
867.
868.
869.//******************************************************************************
870.
871.
872./**
873. * Game over panel.
874. * @param {!HTMLCanvasElement} canvas
875. * @param {!HTMLImage} textSprite
876. * @param {!HTMLImage} restartImg
877. * @param {!Object} dimensions Canvas dimensions.
878. * @constructor
879. */
880.function GameOverPanel(canvas, textSprite, restartImg, dimensions) {
881. this.canvas = canvas;
882. this.canvasCtx = canvas.getContext('2d');
883. this.canvasDimensions = dimensions;
884. this.textSprite = textSprite;
885. this.restartImg = restartImg;
886. this.draw();
887.};
888.
889.
890./**
891. * Dimensions used in the panel.
892. * @enum {number}
893. */
894.GameOverPanel.dimensions = {
895. TEXT_X: 0,
896. TEXT_Y: 13,
897. TEXT_WIDTH: 191,
898. TEXT_HEIGHT: 11,
899. RESTART_WIDTH: 36,
900. RESTART_HEIGHT: 32
901.};
902.
903.
904.GameOverPanel.prototype = {
905. /**
906. * Update the panel dimensions.
907. * @param {number} width New canvas width.
908. * @param {number} opt_height Optional new canvas height.
909. */
910. updateDimensions: function(width, opt_height) {
911. this.canvasDimensions.WIDTH = width;
912. if (opt_height) {
913. this.canvasDimensions.HEIGHT = opt_height;
914. }
915. },
916.
917. /**
918. * Draw the panel.
919. */
920. draw: function() {
921. var dimensions = GameOverPanel.dimensions;
922.
923. var centerX = this.canvasDimensions.WIDTH / 2;
924.
925. // Game over text.
926. var textSourceX = dimensions.TEXT_X;
927. var textSourceY = dimensions.TEXT_Y;
928. var textSourceWidth = dimensions.TEXT_WIDTH;
929. var textSourceHeight = dimensions.TEXT_HEIGHT;
930.
931. var textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
932. var textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
933. var textTargetWidth = dimensions.TEXT_WIDTH;
934. var textTargetHeight = dimensions.TEXT_HEIGHT;
935.
936. var restartSourceWidth = dimensions.RESTART_WIDTH;
937. var restartSourceHeight = dimensions.RESTART_HEIGHT;
938. var restartTargetX = centerX - (dimensions.RESTART_WIDTH / 2);
939. var restartTargetY = this.canvasDimensions.HEIGHT / 2;
940.
941. if (IS_HIDPI) {
942. textSourceY *= 2;
943. textSourceX *= 2;
944. textSourceWidth *= 2;
945. textSourceHeight *= 2;
946. restartSourceWidth *= 2;
947. restartSourceHeight *= 2;
948. }
949.
950. // Game over text from sprite.
951. this.canvasCtx.drawImage(this.textSprite,
952. textSourceX, textSourceY, textSourceWidth, textSourceHeight,
953. textTargetX, textTargetY, textTargetWidth, textTargetHeight);
954.
955. // Restart button.
956. this.canvasCtx.drawImage(this.restartImg, 0, 0,
957. restartSourceWidth, restartSourceHeight,
958. restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
959. dimensions.RESTART_HEIGHT);
960. }
961.};
962.
963.
964.//******************************************************************************
965.
966./**
967. * Check for a collision.
968. * @param {!Obstacle} obstacle
969. * @param {!Trex} tRex T-rex object.
970. * @param {HTMLCanvasContext} opt_canvasCtx Optional canvas context for drawing
971. * collision boxes.
972. * @return {Array.<CollisionBox>}
973. */
974.function checkForCollision(obstacle, tRex, opt_canvasCtx) {
975. var obstacleBoxXPos = Runner.defaultDimensions.WIDTH + obstacle.xPos;
976.
977. // Adjustments are made to the bounding box as there is a 1 pixel white
978. // border around the t-rex and obstacles.
979. var tRexBox = new CollisionBox(
980. tRex.xPos + 1,
981. tRex.yPos + 1,
982. tRex.config.WIDTH - 2,
983. tRex.config.HEIGHT - 2);
984.
985. var obstacleBox = new CollisionBox(
986. obstacle.xPos + 1,
987. obstacle.yPos + 1,
988. obstacle.typeConfig.width * obstacle.size - 2,
989. obstacle.typeConfig.height - 2);
990.
991. // Debug outer box
992. if (opt_canvasCtx) {
993. drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);
994. }
995.
996. // Simple outer bounds check.
997. if (boxCompare(tRexBox, obstacleBox)) {
998. var collisionBoxes = obstacle.collisionBoxes;
999. var tRexCollisionBoxes = Trex.collisionBoxes;
1000.
1001. // Detailed axis aligned box check.
1002. for (var t = 0; t < tRexCollisionBoxes.length; t++) {
1003. for (var i = 0; i < collisionBoxes.length; i++) {
1004. // Adjust the box to actual positions.
1005. var adjTrexBox =
1006. createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
1007. var adjObstacleBox =
1008. createAdjustedCollisionBox(collisionBoxes, obstacleBox);
1009. var crashed = boxCompare(adjTrexBox, adjObstacleBox);
1010.
1011. // Draw boxes for debug.
1012. if (opt_canvasCtx) {
1013. drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
1014. }
1015.
1016. if (crashed) {
1017. return [adjTrexBox, adjObstacleBox];
1018. }
1019. }
1020. }
1021. }
1022. return false;
1023.};
1024.
1025.
1026./**
1027. * Adjust the collision box.
1028. * @param {!CollisionBox} box The original box.
1029. * @param {!CollisionBox} adjustment Adjustment box.
1030. * @return {CollisionBox} The adjusted collision box object.
1031. */
1032.function createAdjustedCollisionBox(box, adjustment) {
1033. return new CollisionBox(
1034. box.x + adjustment.x,
1035. box.y + adjustment.y,
1036. box.width,
1037. box.height);
1038.};
1039.
1040.
1041./**
1042. * Draw the collision boxes for debug.
1043. */
1044.function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
1045. canvasCtx.save();
1046. canvasCtx.strokeStyle = '#f00';
1047. canvasCtx.strokeRect(tRexBox.x, tRexBox.y,
1048. tRexBox.width, tRexBox.height);
1049.
1050. canvasCtx.strokeStyle = '#0f0';
1051. canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
1052. obstacleBox.width, obstacleBox.height);
1053. canvasCtx.restore();
1054.};
1055.
1056.
1057./**
1058. * Compare two collision boxes for a collision.
1059. * @param {CollisionBox} tRexBox
1060. * @param {CollisionBox} obstacleBox
1061. * @return {boolean} Whether the boxes intersected.
1062. */
1063.function boxCompare(tRexBox, obstacleBox) {
1064. var crashed = false;
1065. var tRexBoxX = tRexBox.x;
1066. var tRexBoxY = tRexBox.y;
1067.
1068. var obstacleBoxX = obstacleBox.x;
1069. var obstacleBoxY = obstacleBox.y;
1070.
1071. // Axis-Aligned Bounding Box method.
1072. if (tRexBox.x < obstacleBoxX + obstacleBox.width &&
1073. tRexBox.x + tRexBox.width > obstacleBoxX &&
1074. tRexBox.y < obstacleBox.y + obstacleBox.height &&
1075. tRexBox.height + tRexBox.y > obstacleBox.y) {
1076. crashed = true;
1077. }
1078.
1079. return crashed;
1080.};
1081.
1082.
1083.//******************************************************************************
1084.
1085./**
1086. * Collision box object.
1087. * @param {number} x X position.
1088. * @param {number} y Y Position.
1089. * @param {number} w Width.
1090. * @param {number} h Height.
1091. */
1092.function CollisionBox(x, y, w, h) {
1093. this.x = x;
1094. this.y = y;
1095. this.width = w;
1096. this.height = h;
1097.};
1098.
1099.
1100.//******************************************************************************
1101.
1102./**
1103. * Obstacle.
1104. * @param {HTMLCanvasCtx} canvasCtx
1105. * @param {Obstacle.type} type
1106. * @param {image} obstacleImg Image sprite.
1107. * @param {Object} dimensions
1108. * @param {number} gapCoefficient Mutipler in determining the gap.
1109. * @param {number} speed
1110. */
1111.function Obstacle(canvasCtx, type, obstacleImg, dimensions,
1112. gapCoefficient, speed) {
1113.
1114. this.canvasCtx = canvasCtx;
1115. this.image = obstacleImg;
1116. this.typeConfig = type;
1117. this.gapCoefficient = gapCoefficient;
1118. this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
1119. this.dimensions = dimensions;
1120. this.remove = false;
1121. this.xPos = 0;
1122. this.yPos = this.typeConfig.yPos;
1123. this.width = 0;
1124. this.collisionBoxes = [];
1125. this.gap = 0;
1126.
1127. this.init(speed);
1128.};
1129.
1130./**
1131. * Coefficient for calculating the maximum gap.
1132. * @const
1133. */
1134.Obstacle.MAX_GAP_COEFFICIENT = 1.5;
1135.
1136./**
1137. * Maximum obstacle grouping count.
1138. * @const
1139. */
1140.Obstacle.MAX_OBSTACLE_LENGTH = 3,
1141.
1142.
1143.Obstacle.prototype = {
1144. /**
1145. * Initialise the DOM for the obstacle.
1146. * @param {number} speed
1147. */
1148. init: function(speed) {
1149. this.cloneCollisionBoxes();
1150.
1151. // Only allow sizing if we're at the right speed.
1152. if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {
1153. this.size = 1;
1154. }
1155.
1156. this.width = this.typeConfig.width * this.size;
1157. this.xPos = this.dimensions.WIDTH - this.width;
1158.
1159. this.draw();
1160.
1161. // Make collision box adjustments,
1162. // Central box is adjusted to the size as one box.
1163. // ____ ______ ________
1164. // _| |-| _| |-| _| |-|
1165. // | |<->| | | |<--->| | | |<----->| |
1166. // | | 1 | | | | 2 | | | | 3 | |
1167. // |_|___|_| |_|_____|_| |_|_______|_|
1168. //
1169. if (this.size > 1) {
1170. this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -
1171. this.collisionBoxes[2].width;
1172. this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;
1173. }
1174.
1175. this.gap = this.getGap(this.gapCoefficient, speed);
1176. },
1177.
1178. /**
1179. * Draw and crop based on size.
1180. */
1181. draw: function() {
1182. var sourceWidth = this.typeConfig.width;
1183. var sourceHeight = this.typeConfig.height;
1184.
1185. if (IS_HIDPI) {
1186. sourceWidth = sourceWidth * 2;
1187. sourceHeight = sourceHeight * 2;
1188. }
1189.
1190. // Sprite
1191. var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1));
1192. this.canvasCtx.drawImage(this.image,
1193. sourceX, 0,
1194. sourceWidth * this.size, sourceHeight,
1195. this.xPos, this.yPos,
1196. this.typeConfig.width * this.size, this.typeConfig.height);
1197. },
1198.
1199. /**
1200. * Obstacle frame update.
1201. * @param {number} deltaTime
1202. * @param {number} speed
1203. */
1204. update: function(deltaTime, speed) {
1205. if (!this.remove) {
1206. this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
1207. this.draw();
1208.
1209. if (!this.isVisible()) {
1210. this.remove = true;
1211. }
1212. }
1213. },
1214.
1215. /**
1216. * Calculate a random gap size.
1217. * - Minimum gap gets wider as speed increses
1218. * @param {number} gapCoefficient
1219. * @param {number} speed
1220. * @return {number} The gap size.
1221. */
1222. getGap: function(gapCoefficient, speed) {
1223. var minGap = Math.round(this.width * speed +
1224. this.typeConfig.minGap * gapCoefficient);
1225. var maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
1226. return getRandomNum(minGap, maxGap);
1227. },
1228.
1229. /**
1230. * Check if obstacle is visible.
1231. * @return {boolean} Whether the obstacle is in the game area.
1232. */
1233. isVisible: function() {
1234. return this.xPos + this.width > 0;
1235. },
1236.
1237. /**
1238. * Make a copy of the collision boxes, since these will change based on
1239. * obstacle type and size.
1240. */
1241. cloneCollisionBoxes: function() {
1242. var collisionBoxes = this.typeConfig.collisionBoxes;
1243.
1244. for (var i = collisionBoxes.length - 1; i >= 0; i--) {
1245. this.collisionBoxes = new CollisionBox(collisionBoxes.x,
1246. collisionBoxes.y, collisionBoxes.width,
1247. collisionBoxes.height);
1248. }
1249. }
1250.};
1251.
1252.
1253./**
1254. * Obstacle definitions.
1255. * minGap: minimum pixel space betweeen obstacles.
1256. * multipleSpeed: Speed at which multiples are allowed.
1257. */
1258.Obstacle.types = [
1259. {
1260. type: 'CACTUS_SMALL',
1261. className: ' cactus cactus-small ',
1262. width: 17,
1263. height: 35,
1264. yPos: 105,
1265. multipleSpeed: 3,
1266. minGap: 120,
1267. collisionBoxes: [
1268. new CollisionBox(0, 7, 5, 27),
1269. new CollisionBox(4, 0, 6, 34),
1270. new CollisionBox(10, 4, 7, 14)
1271. ]
1272. },
1273. {
1274. type: 'CACTUS_LARGE',
1275. className: ' cactus cactus-large ',
1276. width: 25,
1277. height: 50,
1278. yPos: 90,
1279. multipleSpeed: 6,
1280. minGap: 120,
1281. collisionBoxes: [
1282. new CollisionBox(0, 12, 7, 38),
1283. new CollisionBox(8, 0, 7, 49),
1284. new CollisionBox(13, 10, 10, 38)
1285. ]
1286. }
1287.];
1288.
1289.
1290.//******************************************************************************
1291./**
1292. * T-rex game character.
1293. * @param {HTMLCanvas} canvas
1294. * @param {HTMLImage} image Character image.
1295. * @constructor
1296. */
1297.function Trex(canvas, image) {
1298. this.canvas = canvas;
1299. this.canvasCtx = canvas.getContext('2d');
1300. this.image = image;
1301. this.xPos = 0;
1302. this.yPos = 0;
1303. // Position when on the ground.
1304. this.groundYPos = 0;
1305. this.currentFrame = 0;
1306. this.currentAnimFrames = [];
1307. this.blinkDelay = 0;
1308. this.animStartTime = 0;
1309. this.timer = 0;
1310. this.msPerFrame = 1000 / FPS;
1311. this.config = Trex.config;
1312. // Current status.
1313. this.status = Trex.status.WAITING;
1314.
1315. this.jumping = false;
1316. this.jumpVelocity = 0;
1317. this.reachedMinHeight = false;
1318. this.speedDrop = false;
1319. this.jumpCount = 0;
1320. this.jumpspotX = 0;
1321.
1322. this.init();
1323.};
1324.
1325.
1326./**
1327. * T-rex player config.
1328. * @enum {number}
1329. */
1330.Trex.config = {
1331. DROP_VELOCITY: -5,
1332. GRAVITY: 0.6,
1333. HEIGHT: 47,
1334. INIITAL_JUMP_VELOCITY: -10,
1335. INTRO_DURATION: 1500,
1336. MAX_JUMP_HEIGHT: 30,
1337. MIN_JUMP_HEIGHT: 30,
1338. SPEED_DROP_COEFFICIENT: 3,
1339. SPRITE_WIDTH: 262,
1340. START_X_POS: 50,
1341. WIDTH: 44
1342.};
1343.
1344.
1345./**
1346. * Used in collision detection.
1347. * @type {Array.<CollisionBox>}
1348. */
1349.Trex.collisionBoxes = [
1350. new CollisionBox(1, -1, 30, 26),
1351. new CollisionBox(32, 0, 8, 16),
1352. new CollisionBox(10, 35, 14, 8),
1353. new CollisionBox(1, 24, 29, 5),
1354. new CollisionBox(5, 30, 21, 4),
1355. new CollisionBox(9, 34, 15, 4)
1356.];
1357.
1358.
1359./**
1360. * Animation states.
1361. * @enum {string}
1362. */
1363.Trex.status = {
1364. CRASHED: 'CRASHED',
1365. JUMPING: 'JUMPING',
1366. RUNNING: 'RUNNING',
1367. WAITING: 'WAITING'
1368.};
1369.
1370./**
1371. * Blinking coefficient.
1372. * @const
1373. */
1374.Trex.BLINK_TIMING = 7000;
1375.
1376.
1377./**
1378. * Animation config for different states.
1379. * @enum {object}
1380. */
1381.Trex.animFrames = {
1382. WAITING: {
1383. frames: [44, 0],
1384. msPerFrame: 1000 / 3
1385. },
1386. RUNNING: {
1387. frames: [88, 132],
1388. msPerFrame: 1000 / 12
1389. },
1390. CRASHED: {
1391. frames: [220],
1392. msPerFrame: 1000 / 60
1393. },
1394. JUMPING: {
1395. frames: [0],
1396. msPerFrame: 1000 / 60
1397. }
1398.};
1399.
1400.
1401.Trex.prototype = {
1402. /**
1403. * T-rex player initaliser.
1404. * Sets the t-rex to blink at random intervals.
1405. */
1406. init: function() {
1407. this.blinkDelay = this.setBlinkDelay();
1408. this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
1409. Runner.config.BOTTOM_PAD;
1410. this.yPos = this.groundYPos;
1411. this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;
1412.
1413. this.draw(0, 0);
1414. this.update(0, Trex.status.WAITING);
1415. },
1416.
1417. /**
1418. * Setter for the jump velocity.
1419. * The approriate drop velocity is also set.
1420. */
1421. setJumpVelocity: function(setting) {
1422. this.config.INIITAL_JUMP_VELOCITY = -setting;
1423. this.config.DROP_VELOCITY = -setting / 2;
1424. },
1425.
1426. /**
1427. * Set the animation status.
1428. * @param {!number} deltaTime
1429. * @param {Trex.status} status Optional status to switch to.
1430. */
1431. update: function(deltaTime, opt_status) {
1432. this.timer += deltaTime;
1433.
1434. // Update the status.
1435. if (opt_status) {
1436. this.status = opt_status;
1437. this.currentFrame = 0;
1438. this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
1439. this.currentAnimFrames = Trex.animFrames[opt_status].frames;
1440.
1441. if (opt_status == Trex.status.WAITING) {
1442. this.animStartTime = getTimeStamp();
1443. this.setBlinkDelay();
1444. }
1445. }
1446.
1447. // Game intro animation, T-rex moves in from the left.
1448. if (this.playingIntro && this.xPos < this.config.START_X_POS) {
1449. this.xPos += Math.round((this.config.START_X_POS /
1450. this.config.INTRO_DURATION) * deltaTime);
1451. }
1452.
1453. if (this.status == Trex.status.WAITING) {
1454. this.blink(getTimeStamp());
1455. } else {
1456. this.draw(this.currentAnimFrames[this.currentFrame], 0);
1457. }
1458.
1459. // Update the frame position.
1460. if (this.timer >= this.msPerFrame) {
1461. this.currentFrame = this.currentFrame ==
1462. this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
1463. this.timer = 0;
1464. }
1465. },
1466.
1467. /**
1468. * Draw the t-rex to a particular position.
1469. * @param {number} x
1470. * @param {number} y
1471. */
1472. draw: function(x, y) {
1473. var sourceX = x;
1474. var sourceY = y;
1475. var sourceWidth = this.config.WIDTH;
1476. var sourceHeight = this.config.HEIGHT;
1477.
1478. if (IS_HIDPI) {
1479. sourceX *= 2;
1480. sourceY *= 2;
1481. sourceWidth *= 2;
1482. sourceHeight *= 2;
1483. }
1484.
1485. this.canvasCtx.drawImage(this.image, sourceX, sourceY,
1486. sourceWidth, sourceHeight,
1487. this.xPos, this.yPos,
1488. this.config.WIDTH, this.config.HEIGHT);
1489. },
1490.
1491. /**
1492. * Sets a random time for the blink to happen.
1493. */
1494. setBlinkDelay: function() {
1495. this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
1496. },
1497.
1498. /**
1499. * Make t-rex blink at random intervals.
1500. * @param {number} time Current time in milliseconds.
1501. */
1502. blink: function(time) {
1503. var deltaTime = time - this.animStartTime;
1504.
1505. if (deltaTime >= this.blinkDelay) {
1506. this.draw(this.currentAnimFrames[this.currentFrame], 0);
1507.
1508. if (this.currentFrame == 1) {
1509. // Set new random delay to blink.
1510. this.setBlinkDelay();
1511. this.animStartTime = time;
1512. }
1513. }
1514. },
1515.
1516. /**
1517. * Initialise a jump.
1518. */
1519. startJump: function() {
1520. if (!this.jumping) {
1521. this.update(0, Trex.status.JUMPING);
1522. this.jumpVelocity = this.config.INIITAL_JUMP_VELOCITY;
1523. this.jumping = true;
1524. this.reachedMinHeight = false;
1525. this.speedDrop = false;
1526. }
1527. },
1528.
1529. /**
1530. * Jump is complete, falling down.
1531. */
1532. endJump: function() {
1533. if (this.reachedMinHeight &&
1534. this.jumpVelocity < this.config.DROP_VELOCITY) {
1535. this.jumpVelocity = this.config.DROP_VELOCITY;
1536. }
1537. },
1538.
1539. /**
1540. * Update frame for a jump.
1541. * @param {number} deltaTime
1542. */
1543. updateJump: function(deltaTime) {
1544. var msPerFrame = Trex.animFrames[this.status].msPerFrame;
1545. var framesElapsed = deltaTime / msPerFrame;
1546.
1547. // Speed drop makes Trex fall faster.
1548. if (this.speedDrop) {
1549. this.yPos += Math.round(this.jumpVelocity *
1550. this.config.SPEED_DROP_COEFFICIENT * framesElapsed);
1551. } else {
1552. this.yPos += Math.round(this.jumpVelocity * framesElapsed);
1553. }
1554.
1555. this.jumpVelocity += this.config.GRAVITY * framesElapsed;
1556.
1557. // Minimum height has been reached.
1558. if (this.yPos < this.minJumpHeight || this.speedDrop) {
1559. this.reachedMinHeight = true;
1560. }
1561.
1562. // Reached max height
1563. if (this.yPos < this.config.MAX_JUMP_HEIGHT || this.speedDrop) {
1564. this.endJump();
1565. }
1566.
1567. // Back down at ground level. Jump completed.
1568. if (this.yPos > this.groundYPos) {
1569. this.reset();
1570. this.jumpCount++;
1571. }
1572.
1573. this.update(deltaTime);
1574. },
1575.
1576. /**
1577. * Set the speed drop. Immediately cancels the current jump.
1578. */
1579. setSpeedDrop: function() {
1580. this.speedDrop = true;
1581. this.jumpVelocity = 1;
1582. },
1583.
1584. /**
1585. * Reset the t-rex to running at start of game.
1586. */
1587. reset: function() {
1588. this.yPos = this.groundYPos;
1589. this.jumpVelocity = 0;
1590. this.jumping = false;
1591. this.update(0, Trex.status.RUNNING);
1592. this.midair = false;
1593. this.speedDrop = false;
1594. this.jumpCount = 0;
1595. }
1596.};
1597.
1598.
1599.//******************************************************************************
1600.
1601./**
1602. * Handles displaying the distance meter.
1603. * @param {!HTMLCanvasElement} canvas
1604. * @param {!HTMLImage} spriteSheet Image sprite.
1605. * @param {number} canvasWidth
1606. * @constructor
1607. */
1608.function DistanceMeter(canvas, spriteSheet, canvasWidth) {
1609. this.canvas = canvas;
1610. this.canvasCtx = canvas.getContext('2d');
1611. this.image = spriteSheet;
1612. this.x = 0;
1613. this.y = 5;
1614.
1615. this.currentDistance = 0;
1616. this.maxScore = 0;
1617. this.highScore = 0;
1618. this.container = null;
1619.
1620. this.digits = [];
1621. this.acheivement = false;
1622. this.defaultString = '';
1623. this.flashTimer = 0;
1624. this.flashIterations = 0;
1625.
1626. this.config = DistanceMeter.config;
1627. this.init(canvasWidth);
1628.};
1629.
1630.
1631./**
1632. * @enum {number}
1633. */
1634.DistanceMeter.dimensions = {
1635. WIDTH: 10,
1636. HEIGHT: 13,
1637. DEST_WIDTH: 11
1638.};
1639.
1640.
1641./**
1642. * Y positioning of the digits in the sprite sheet.
1643. * X position is always 0.
1644. * @type {array.<number>}
1645. */
1646.DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];
1647.
1648.
1649./**
1650. * Distance meter config.
1651. * @enum {number}
1652. */
1653.DistanceMeter.config = {
1654. // Number of digits.
1655. MAX_DISTANCE_UNITS: 5,
1656.
1657. // Distance that causes achievement animation.
1658. ACHIEVEMENT_DISTANCE: 100,
1659.
1660. // Used for conversion from pixel distance to a scaled unit.
1661. COEFFICIENT: 0.025,
1662.
1663. // Flash duration in milliseconds.
1664. FLASH_DURATION: 1000 / 4,
1665.
1666. // Flash iterations for achievement animation.
1667. FLASH_ITERATIONS: 3
1668.};
1669.
1670.
1671.DistanceMeter.prototype = {
1672. /**
1673. * Initialise the distance meter to '00000'.
1674. * @param {number} width Canvas width in px.
1675. */
1676. init: function(width) {
1677. var maxDistanceStr = '';
1678.
1679. this.calcXPos(width);
1680. this.maxScore = this.config.MAX_DISTANCE_UNITS;
1681. for (var i = 0; i < this.config.MAX_DISTANCE_UNITS; i++) {
1682. this.draw(i, 0);
1683. this.defaultString += '0';
1684. maxDistanceStr += '9';
1685. }
1686.
1687. this.maxScore = parseInt(maxDistanceStr);
1688. },
1689.
1690. /**
1691. * Calculate the xPos in the canvas.
1692. * @param {number} canvasWidth
1693. */
1694. calcXPos: function(canvasWidth) {
1695. this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *
1696. (this.config.MAX_DISTANCE_UNITS + 1));
1697. },
1698.
1699. /**
1700. * Draw a digit to canvas.
1701. * @param {number} digitPos Position of the digit.
1702. * @param {number} value Digit value 0-9.
1703. * @param {boolean} opt_highScore Whether drawing the high score.
1704. */
1705. draw: function(digitPos, value, opt_highScore) {
1706. var sourceWidth = DistanceMeter.dimensions.WIDTH;
1707. var sourceHeight = DistanceMeter.dimensions.HEIGHT;
1708. var sourceX = DistanceMeter.dimensions.WIDTH * value;
1709.
1710. var targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
1711. var targetY = this.y;
1712. var targetWidth = DistanceMeter.dimensions.WIDTH;
1713. var targetHeight = DistanceMeter.dimensions.HEIGHT;
1714.
1715. // For high DPI we 2x source values.
1716. if (IS_HIDPI) {
1717. sourceWidth *= 2;
1718. sourceHeight *= 2;
1719. sourceX *= 2;
1720. }
1721.
1722. this.canvasCtx.save();
1723.
1724. if (opt_highScore) {
1725. // Left of the current score.
1726. var highScoreX = this.x - (this.config.MAX_DISTANCE_UNITS * 2) *
1727. DistanceMeter.dimensions.WIDTH;
1728. this.canvasCtx.translate(highScoreX, this.y);
1729. } else {
1730. this.canvasCtx.translate(this.x, this.y);
1731. }
1732.
1733. this.canvasCtx.drawImage(this.image, sourceX, 0,
1734. sourceWidth, sourceHeight,
1735. targetX, targetY,
1736. targetWidth, targetHeight
1737. );
1738.
1739. this.canvasCtx.restore();
1740. },
1741.
1742. /**
1743. * Covert pixel distance to a 'real' distance.
1744. * @param {number} distance Pixel distance ran.
1745. * @return {number} The 'real' distance ran.
1746. */
1747. getActualDistance: function(distance) {
1748. return distance ?
1749. Math.round(distance * this.config.COEFFICIENT) : 0;
1750. },
1751.
1752. /**
1753. * Update the distance meter.
1754. * @param {number} deltaTime
1755. * @param {number} distance
1756. * @return {boolean} Whether the acheivement sound fx should be played.
1757. */
1758. update: function(deltaTime, distance) {
1759. var paint = true;
1760. var playSound = false;
1761.
1762. if (!this.acheivement) {
1763. distance = this.getActualDistance(distance);
1764.
1765. if (distance > 0) {
1766. // Acheivement unlocked
1767. if (distance % this.config.ACHIEVEMENT_DISTANCE == 0) {
1768. // Flash score and play sound.
1769. this.acheivement = true;
1770. this.flashTimer = 0;
1771. playSound = true;
1772. }
1773.
1774. // Create a string representation of the distance with leading 0.
1775. var distanceStr = (this.defaultString +
1776. distance).substr(-this.config.MAX_DISTANCE_UNITS);
1777. this.digits = distanceStr.split('');
1778. } else {
1779. this.digits = this.defaultString.split('');
1780. }
1781. } else {
1782. // Control flashing of the score on reaching acheivement.
1783. if (this.flashIterations <= this.config.FLASH_ITERATIONS) {
1784. this.flashTimer += deltaTime;
1785.
1786. if (this.flashTimer < this.config.FLASH_DURATION) {
1787. paint = false;
1788. } else if (this.flashTimer >
1789. this.config.FLASH_DURATION * 2) {
1790. this.flashTimer = 0;
1791. this.flashIterations++;
1792. }
1793. } else {
1794. this.acheivement = false;
1795. this.flashIterations = 0;
1796. this.flashTimer = 0;
1797. }
1798. }
1799.
1800. // Draw the digits if not flashing.
1801. if (paint) {
1802. for (var i = this.digits.length - 1; i >= 0; i--) {
1803. this.draw(i, parseInt(this.digits));
1804. }
1805. }
1806.
1807. this.drawHighScore();
1808.
1809. return playSound;
1810. },
1811.
1812. /**
1813. * Draw the high score.
1814. */
1815. drawHighScore: function() {
1816. this.canvasCtx.save();
1817. this.canvasCtx.globalAlpha = .8;
1818. for (var i = this.highScore.length - 1; i >= 0; i--) {
1819. this.draw(i, parseInt(this.highScore, 10), true);
1820. }
1821. this.canvasCtx.restore();
1822. },
1823.
1824. /**
1825. * Set the highscore as a array string.
1826. * Position of char in the sprite: H - 10, I - 11.
1827. * @param {number} distance Distance ran in pixels.
1828. */
1829. setHighScore: function(distance) {
1830. distance = this.getActualDistance(distance);
1831. var highScoreStr = (this.defaultString +
1832. distance).substr(-this.config.MAX_DISTANCE_UNITS);
1833.
1834. this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));
1835. },
1836.
1837. /**
1838. * Reset the distance meter back to '00000'.
1839. */
1840. reset: function() {
1841. this.update(0);
1842. this.acheivement = false;
1843. }
1844.};
1845.
1846.
1847.//******************************************************************************
1848.
1849./**
1850. * Cloud background item.
1851. * Similar to an obstacle object but without collision boxes.
1852. * @param {HTMLCanvasElement} canvas Canvas element.
1853. * @param {Image} cloudImg
1854. * @param {number} containerWidth
1855. */
1856.function Cloud(canvas, cloudImg, containerWidth) {
1857. this.canvas = canvas;
1858. this.canvasCtx = this.canvas.getContext('2d');
1859. this.image = cloudImg;
1860. this.containerWidth = containerWidth;
1861. this.xPos = containerWidth;
1862. this.yPos = 0;
1863. this.remove = false;
1864. this.cloudGap = getRandomNum(Cloud.config.MIN_CLOUD_GAP,
1865. Cloud.config.MAX_CLOUD_GAP);
1866.
1867. this.init();
1868.};
1869.
1870.
1871./**
1872. * Cloud object config.
1873. * @enum {number}
1874. */
1875.Cloud.config = {
1876. HEIGHT: 14,
1877. MAX_CLOUD_GAP: 400,
1878. MAX_SKY_LEVEL: 30,
1879. MIN_CLOUD_GAP: 100,
1880. MIN_SKY_LEVEL: 71,
1881. WIDTH: 46
1882.};
1883.
1884.
1885.Cloud.prototype = {
1886. /**
1887. * Initialise the cloud. Sets the Cloud height.
1888. */
1889. init: function() {
1890. this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
1891. Cloud.config.MIN_SKY_LEVEL);
1892. this.draw();
1893. },
1894.
1895. /**
1896. * Draw the cloud.
1897. */
1898. draw: function() {
1899. this.canvasCtx.save();
1900. var sourceWidth = Cloud.config.WIDTH;
1901. var sourceHeight = Cloud.config.HEIGHT;
1902.
1903. if (IS_HIDPI) {
1904. sourceWidth = sourceWidth * 2;
1905. sourceHeight = sourceHeight * 2;
1906. }
1907.
1908. this.canvasCtx.drawImage(this.image, 0, 0,
1909. sourceWidth, sourceHeight,
1910. this.xPos, this.yPos,
1911. Cloud.config.WIDTH, Cloud.config.HEIGHT);
1912.
1913. this.canvasCtx.restore();
1914. },
1915.
1916. /**
1917. * Update the cloud position.
1918. * @param {number} speed
1919. */
1920. update: function(speed) {
1921. if (!this.remove) {
1922. this.xPos -= Math.ceil(speed);
1923. this.draw();
1924.
1925. // Mark as removeable if no longer in the canvas.
1926. if (!this.isVisible()) {
1927. this.remove = true;
1928. }
1929. }
1930. },
1931.
1932. /**
1933. * Check if the cloud is visible on the stage.
1934. * @return {boolean}
1935. */
1936. isVisible: function() {
1937. return this.xPos + Cloud.config.WIDTH > 0;
1938. }
1939.};
1940.
1941.
1942.//******************************************************************************
1943.
1944./**
1945. * Horizon Line.
1946. * Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.
1947. * @param {HTMLCanvasElement} canvas
1948. * @param {HTMLImage} bgImg Horizon line sprite.
1949. * @constructor
1950. */
1951.function HorizonLine(canvas, bgImg) {
1952. this.image = bgImg;
1953. this.canvas = canvas;
1954. this.canvasCtx = canvas.getContext('2d');
1955. this.sourceDimensions = {};
1956. this.dimensions = HorizonLine.dimensions;
1957. this.sourceXPos = [0, this.dimensions.WIDTH];
1958. this.xPos = [];
1959. this.yPos = 0;
1960. this.bumpThreshold = 0.5;
1961.
1962. this.setSourceDimensions();
1963. this.draw();
1964.};
1965.
1966.
1967./**
1968. * Horizon line dimensions.
1969. * @enum {number}
1970. */
1971.HorizonLine.dimensions = {
1972. WIDTH: 600,
1973. HEIGHT: 12,
1974. YPOS: 127
1975.};
1976.
1977.
1978.HorizonLine.prototype = {
1979. /**
1980. * Set the source dimensions of the horizon line.
1981. */
1982. setSourceDimensions: function() {
1983.
1984. for (var dimension in HorizonLine.dimensions) {
1985. if (IS_HIDPI) {
1986. if (dimension != 'YPOS') {
1987. this.sourceDimensions[dimension] =
1988. HorizonLine.dimensions[dimension] * 2;
1989. }
1990. } else {
1991. this.sourceDimensions[dimension] =
1992. HorizonLine.dimensions[dimension];
1993. }
1994. this.dimensions[dimension] = HorizonLine.dimensions[dimension];
1995. }
1996.
1997. this.xPos = [0, HorizonLine.dimensions.WIDTH];
1998. this.yPos = HorizonLine.dimensions.YPOS;
1999. },
2000.
2001. /**
2002. * Return the crop x position of a type.
2003. */
2004. getRandomType: function() {
2005. return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
2006. },
2007.
2008. /**
2009. * Draw the horizon line.
2010. */
2011. draw: function() {
2012. this.canvasCtx.drawImage(this.image, this.sourceXPos[0], 0,
2013. this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
2014. this.xPos[0], this.yPos,
2015. this.dimensions.WIDTH, this.dimensions.HEIGHT);
2016.
2017. this.canvasCtx.drawImage(this.image, this.sourceXPos[1], 0,
2018. this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
2019. this.xPos[1], this.yPos,
2020. this.dimensions.WIDTH, this.dimensions.HEIGHT);
2021. },
2022.
2023. /**
2024. * Update the x position of an indivdual piece of the line.
2025. * @param {number} pos Line position.
2026. * @param {number} increment
2027. */
2028. updateXPos: function(pos, increment) {
2029. var line1 = pos;
2030. var line2 = pos == 0 ? 1 : 0;
2031.
2032. this.xPos[line1] -= increment;
2033. this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
2034.
2035. if (this.xPos[line1] <= -this.dimensions.WIDTH) {
2036. this.xPos[line1] += this.dimensions.WIDTH * 2;
2037. this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
2038. this.sourceXPos[line1] = this.getRandomType();
2039. }
2040. },
2041.
2042. /**
2043. * Update the horizon line.
2044. * @param {number} deltaTime
2045. * @param {number} speed
2046. */
2047. update: function(deltaTime, speed) {
2048. var increment = Math.floor(speed * (FPS / 1000) * deltaTime);
2049.
2050. if (this.xPos[0] <= 0) {
2051. this.updateXPos(0, increment);
2052. } else {
2053. this.updateXPos(1, increment);
2054. }
2055. this.draw();
2056. },
2057.
2058. /**
2059. * Reset horizon to the starting position.
2060. */
2061. reset: function() {
2062. this.xPos[0] = 0;
2063. this.xPos[1] = HorizonLine.dimensions.WIDTH;
2064. }
2065.};
2066.
2067.
2068.//******************************************************************************
2069.
2070./**
2071. * Horizon background class.
2072. * @param {HTMLCanvasElement} canvas
2073. * @param {Array.<HTMLImageElement>} images
2074. * @param {object} dimensions Canvas dimensions.
2075. * @param {number} gapCoefficient
2076. * @constructor
2077. */
2078.function Horizon(canvas, images, dimensions, gapCoefficient) {
2079. this.canvas = canvas;
2080. this.canvasCtx = this.canvas.getContext('2d');
2081. this.config = Horizon.config;
2082. this.dimensions = dimensions;
2083. this.gapCoefficient = gapCoefficient;
2084. this.obstacles = [];
2085. this.horizonOffsets = [0, 0];
2086. this.cloudFrequency = this.config.CLOUD_FREQUENCY;
2087.
2088. // Cloud
2089. this.clouds = [];
2090. this.cloudImg = images.CLOUD;
2091. this.cloudSpeed = this.config.BG_CLOUD_SPEED;
2092.
2093. // Horizon
2094. this.horizonImg = images.HORIZON;
2095. this.horizonLine = null;
2096.
2097. // Obstacles
2098. this.obstacleImgs = {
2099. CACTUS_SMALL: images.CACTUS_SMALL,
2100. CACTUS_LARGE: images.CACTUS_LARGE
2101. };
2102.
2103. this.init();
2104.};
2105.
2106.
2107./**
2108. * Horizon config.
2109. * @enum {number}
2110. */
2111.Horizon.config = {
2112. BG_CLOUD_SPEED: 0.2,
2113. BUMPY_THRESHOLD: .3,
2114. CLOUD_FREQUENCY: .5,
2115. HORIZON_HEIGHT: 16,
2116. MAX_CLOUDS: 6
2117.};
2118.
2119.
2120.Horizon.prototype = {
2121. /**
2122. * Initialise the horizon. Just add the line and a cloud. No obstacles.
2123. */
2124. init: function() {
2125. this.addCloud();
2126. this.horizonLine = new HorizonLine(this.canvas, this.horizonImg);
2127. },
2128.
2129. /**
2130. * @param {number} deltaTime
2131. * @param {number} currentSpeed
2132. * @param {boolean} updateObstacles Used as an override to prevent
2133. * the obstacles from being updated / added. This happens in the
2134. * ease in section.
2135. */
2136. update: function(deltaTime, currentSpeed, updateObstacles) {
2137. this.runningTime += deltaTime;
2138. this.horizonLine.update(deltaTime, currentSpeed);
2139. this.updateClouds(deltaTime, currentSpeed);
2140.
2141. if (updateObstacles) {
2142. this.updateObstacles(deltaTime, currentSpeed);
2143. }
2144. },
2145.
2146. /**
2147. * Update the cloud positions.
2148. * @param {number} deltaTime
2149. * @param {number} currentSpeed
2150. */
2151. updateClouds: function(deltaTime, speed) {
2152. var cloudSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
2153. var numClouds = this.clouds.length;
2154.
2155. if (numClouds) {
2156. for (var i = numClouds - 1; i >= 0; i--) {
2157. this.clouds.update(cloudSpeed);
2158. }
2159.
2160. var lastCloud = this.clouds[numClouds - 1];
2161.
2162. // Check for adding a new cloud.
2163. if (numClouds < this.config.MAX_CLOUDS &&
2164. (this.dimensions.WIDTH - lastCloud.xPos) > lastCloud.cloudGap &&
2165. this.cloudFrequency > Math.random()) {
2166. this.addCloud();
2167. }
2168.
2169. // Remove expired clouds.
2170. this.clouds = this.clouds.filter(function(obj) {
2171. return !obj.remove;
2172. });
2173. }
2174. },
2175.
2176. /**
2177. * Update the obstacle positions.
2178. * @param {number} deltaTime
2179. * @param {number} currentSpeed
2180. */
2181. updateObstacles: function(deltaTime, currentSpeed) {
2182. // Obstacles, move to Horizon layer.
2183. var updatedObstacles = this.obstacles.slice(0);
2184.
2185. for (var i = 0; i < this.obstacles.length; i++) {
2186. var obstacle = this.obstacles;
2187. obstacle.update(deltaTime, currentSpeed);
2188.
2189. // Clean up existing obstacles.
2190. if (obstacle.remove) {
2191. updatedObstacles.shift();
2192. }
2193. }
2194. this.obstacles = updatedObstacles;
2195.
2196. if (this.obstacles.length > 0) {
2197. var lastObstacle = this.obstacles[this.obstacles.length - 1];
2198.
2199. if (lastObstacle && !lastObstacle.followingObstacleCreated &&
2200. lastObstacle.isVisible() &&
2201. (lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <
2202. this.dimensions.WIDTH) {
2203. this.addNewObstacle(currentSpeed);
2204. lastObstacle.followingObstacleCreated = true;
2205. }
2206. } else {
2207. // Create new obstacles.
2208. this.addNewObstacle(currentSpeed);
2209. }
2210. },
2211.
2212. /**
2213. * Add a new obstacle.
2214. * @param {number} currentSpeed
2215. */
2216. addNewObstacle: function(currentSpeed) {
2217. var obstacleTypeIndex =
2218. getRandomNum(0, Obstacle.types.length - 1);
2219. var obstacleType = Obstacle.types[obstacleTypeIndex];
2220. var obstacleImg = this.obstacleImgs[obstacleType.type];
2221.
2222. this.obstacles.push(new Obstacle(this.canvasCtx, obstacleType,
2223. obstacleImg, this.dimensions, this.gapCoefficient, currentSpeed));
2224. },
2225.
2226. /**
2227. * Reset the horizon layer.
2228. * Remove existing obstacles and reposition the horizon line.
2229. */
2230. reset: function() {
2231. this.obstacles = [];
2232. this.horizonLine.reset();
2233. },
2234.
2235. /**
2236. * Update the canvas width and scaling.
2237. * @param {number} width Canvas width.
2238. * @param {number} height Canvas height.
2239. */
2240. resize: function(width, height) {
2241. this.canvas.width = width;
2242. this.canvas.height = height;
2243. },
2244.
2245. /**
2246. * Add a new cloud to the horizon.
2247. */
2248. addCloud: function() {
2249. this.clouds.push(new Cloud(this.canvas, this.cloudImg,
2250. this.dimensions.WIDTH));
2251. }
2252.};
2253.})();

quote:

Orijinalden alıntı: takıntılı bir adam

// Copyright (c) 2014 The Chromium Authors. All rights reserved.
2.// Use of this source code is governed by a BSD-style license that can be
3.// found in the LICENSE file.
4.(function() {
5.'use strict';
6./**
7. * T-Rex runner.
8. * @param {string} outerContainerId Outer containing element id.
9. * @param {object} opt_config
10. * @constructor
11. * @export
12. */
13.function Runner(outerContainerId, opt_config) {
14. // Singleton
15. if (Runner.instance_) {
16. return Runner.instance_;
17. }
18. Runner.instance_ = this;
19.
20. this.outerContainerEl = document.querySelector(outerContainerId);
21. this.containerEl = null;
22. this.detailsButton = this.outerContainerEl.querySelector('#details-button');
23.
24. this.config = opt_config || Runner.config;
25.
26. this.dimensions = Runner.defaultDimensions;
27.
28. this.canvas = null;
29. this.canvasCtx = null;
30.
31. this.tRex = null;
32.
33. this.distanceMeter = null;
34. this.distanceRan = 0;
35.
36. this.highestScore = 0;
37.
38. this.time = 0;
39. this.runningTime = 0;
40. this.msPerFrame = 1000 / FPS;
41. this.currentSpeed = this.config.SPEED;
42.
43. this.obstacles = [];
44.
45. this.started = false;
46. this.activated = false;
47. this.crashed = false;
48. this.paused = false;
49.
50. this.resizeTimerId_ = null;
51.
52. this.playCount = 0;
53.
54. // Sound FX.
55. this.audioBuffer = null;
56. this.soundFx = {};
57.
58. // Global web audio context for playing sounds.
59. this.audioContext = null;
60.
61. // Images.
62. this.images = {};
63. this.imagesLoaded = 0;
64. this.loadImages();
65.}
66.window['Runner'] = Runner;
67.
68.
69./**
70. * Default game width.
71. * @const
72. */
73.var DEFAULT_WIDTH = 600;
74.
75./**
76. * Frames per second.
77. * @const
78. */
79.var FPS = 60;
80.
81./** @const */
82.var IS_HIDPI = window.devicePixelRatio > 1;
83.
84./** @const */
85.var IS_IOS =
86. window.navigator.userAgent.indexOf('UIWebViewForStaticFileContent') > -1;
87.
88./** @const */
89.var IS_MOBILE = window.navigator.userAgent.indexOf('Mobi') > -1 || IS_IOS;
90.
91./** @const */
92.var IS_TOUCH_ENABLED = 'ontouchstart' in window;
93.
94./**
95. * Default game configuration.
96. * @enum {number}
97. */
98.Runner.config = {
99. ACCELERATION: 0.001,
100. BG_CLOUD_SPEED: 0.2,
101. BOTTOM_PAD: 10,
102. CLEAR_TIME: 3000,
103. CLOUD_FREQUENCY: 0.5,
104. GAMEOVER_CLEAR_TIME: 750,
105. GAP_COEFFICIENT: 0.6,
106. GRAVITY: 0.6,
107. INITIAL_JUMP_VELOCITY: 12,
108. MAX_CLOUDS: 6,
109. MAX_OBSTACLE_LENGTH: 3,
110. MAX_SPEED: 12,
111. MIN_JUMP_HEIGHT: 35,
112. MOBILE_SPEED_COEFFICIENT: 1.2,
113. RESOURCE_TEMPLATE_ID: 'audio-resources',
114. SPEED: 6,
115. SPEED_DROP_COEFFICIENT: 3
116.};
117.
118.
119./**
120. * Default dimensions.
121. * @enum {string}
122. */
123.Runner.defaultDimensions = {
124. WIDTH: DEFAULT_WIDTH,
125. HEIGHT: 150
126.};
127.
128.
129./**
130. * CSS class names.
131. * @enum {string}
132. */
133.Runner.classes = {
134. CANVAS: 'runner-canvas',
135. CONTAINER: 'runner-container',
136. CRASHED: 'crashed',
137. ICON: 'icon-offline',
138. TOUCH_CONTROLLER: 'controller'
139.};
140.
141.
142./**
143. * Image source urls.
144. * @enum {array.<object>}
145. */
146.Runner.imageSources = {
147. LDPI: [
148. {name: 'CACTUS_LARGE', id: '1x-obstacle-large'},
149. {name: 'CACTUS_SMALL', id: '1x-obstacle-small'},
150. {name: 'CLOUD', id: '1x-cloud'},
151. {name: 'HORIZON', id: '1x-horizon'},
152. {name: 'RESTART', id: '1x-restart'},
153. {name: 'TEXT_SPRITE', id: '1x-text'},
154. {name: 'TREX', id: '1x-trex'}
155. ],
156. HDPI: [
157. {name: 'CACTUS_LARGE', id: '2x-obstacle-large'},
158. {name: 'CACTUS_SMALL', id: '2x-obstacle-small'},
159. {name: 'CLOUD', id: '2x-cloud'},
160. {name: 'HORIZON', id: '2x-horizon'},
161. {name: 'RESTART', id: '2x-restart'},
162. {name: 'TEXT_SPRITE', id: '2x-text'},
163. {name: 'TREX', id: '2x-trex'}
164. ]
165.};
166.
167.
168./**
169. * Sound FX. Reference to the ID of the audio tag on interstitial page.
170. * @enum {string}
171. */
172.Runner.sounds = {
173. BUTTON_PRESS: 'offline-sound-press',
174. HIT: 'offline-sound-hit',
175. SCORE: 'offline-sound-reached'
176.};
177.
178.
179./**
180. * Key code mapping.
181. * @enum {object}
182. */
183.Runner.keycodes = {
184. JUMP: {'38': 1, '32': 1}, // Up, spacebar
185. DUCK: {'40': 1}, // Down
186. RESTART: {'13': 1} // Enter
187.};
188.
189.
190./**
191. * Runner event names.
192. * @enum {string}
193. */
194.Runner.events = {
195. ANIM_END: 'webkitAnimationEnd',
196. CLICK: 'click',
197. KEYDOWN: 'keydown',
198. KEYUP: 'keyup',
199. MOUSEDOWN: 'mousedown',
200. MOUSEUP: 'mouseup',
201. RESIZE: 'resize',
202. TOUCHEND: 'touchend',
203. TOUCHSTART: 'touchstart',
204. VISIBILITY: 'visibilitychange',
205. BLUR: 'blur',
206. FOCUS: 'focus',
207. LOAD: 'load'
208.};
209.
210.
211.Runner.prototype = {
212. /**
213. * Setting individual settings for debugging.
214. * @param {string} setting
215. * @param {*} value
216. */
217. updateConfigSetting: function(setting, value) {
218. if (setting in this.config && value != undefined) {
219. this.config[setting] = value;
220.
221. switch (setting) {
222. case 'GRAVITY':
223. case 'MIN_JUMP_HEIGHT':
224. case 'SPEED_DROP_COEFFICIENT':
225. this.tRex.config[setting] = value;
226. break;
227. case 'INITIAL_JUMP_VELOCITY':
228. this.tRex.setJumpVelocity(value);
229. break;
230. case 'SPEED':
231. this.setSpeed(value);
232. break;
233. }
234. }
235. },
236.
237. /**
238. * Load and cache the image assets from the page.
239. */
240. loadImages: function() {
241. var imageSources = IS_HIDPI ? Runner.imageSources.HDPI :
242. Runner.imageSources.LDPI;
243.
244. var numImages = imageSources.length;
245.
246. for (var i = numImages - 1; i >= 0; i--) {
247. var imgSource = imageSources;
248. this.images[imgSource.name] = document.getElementById(imgSource.id);
249. }
250. this.init();
251. },
252.
253. /**
254. * Load and decode base 64 encoded sounds.
255. */
256. loadSounds: function() {
257. if (!IS_IOS) {
258. this.audioContext = new AudioContext();
259. var resourceTemplate =
260. document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
261.
262. for (var sound in Runner.sounds) {
263. var soundSrc =
264. resourceTemplate.getElementById(Runner.sounds[sound]).src;
265. soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
266. var buffer = decodeBase64ToArrayBuffer(soundSrc);
267.
268. // Async, so no guarantee of order in array.
269. this.audioContext.decodeAudioData(buffer, function(index, audioData) {
270. this.soundFx[index] = audioData;
271. }.bind(this, sound));
272. }
273. }
274. },
275.
276. /**
277. * Sets the game speed. Adjust the speed accordingly if on a smaller screen.
278. * @param {number} opt_speed
279. */
280. setSpeed: function(opt_speed) {
281. var speed = opt_speed || this.currentSpeed;
282.
283. // Reduce the speed on smaller mobile screens.
284. if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
285. var mobileSpeed = speed * this.dimensions.WIDTH / DEFAULT_WIDTH *
286. this.config.MOBILE_SPEED_COEFFICIENT;
287. this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed;
288. } else if (opt_speed) {
289. this.currentSpeed = opt_speed;
290. }
291. },
292.
293. /**
294. * Game initialiser.
295. */
296. init: function() {
297. // Hide the static icon.
298. document.querySelector('.' + Runner.classes.ICON).style.visibility =
299. 'hidden';
300.
301. this.adjustDimensions();
302. this.setSpeed();
303.
304. this.containerEl = document.createElement('div');
305. this.containerEl.className = Runner.classes.CONTAINER;
306.
307. // Player canvas container.
308. this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
309. this.dimensions.HEIGHT, Runner.classes.PLAYER);
310.
311. this.canvasCtx = this.canvas.getContext('2d');
312. this.canvasCtx.fillStyle = '#f7f7f7';
313. this.canvasCtx.fill();
314. Runner.updateCanvasScaling(this.canvas);
315.
316. // Horizon contains clouds, obstacles and the ground.
317. this.horizon = new Horizon(this.canvas, this.images, this.dimensions,
318. this.config.GAP_COEFFICIENT);
319.
320. // Distance meter
321. this.distanceMeter = new DistanceMeter(this.canvas,
322. this.images.TEXT_SPRITE, this.dimensions.WIDTH);
323.
324. // Draw t-rex
325. this.tRex = new Trex(this.canvas, this.images.TREX);
326.
327. this.outerContainerEl.appendChild(this.containerEl);
328.
329. if (IS_MOBILE) {
330. this.createTouchController();
331. }
332.
333. this.startListening();
334. this.update();
335.
336. window.addEventListener(Runner.events.RESIZE,
337. this.debounceResize.bind(this));
338. },
339.
340. /**
341. * Create the touch controller. A div that covers whole screen.
342. */
343. createTouchController: function() {
344. this.touchController = document.createElement('div');
345. this.touchController.className = Runner.classes.TOUCH_CONTROLLER;
346. },
347.
348. /**
349. * Debounce the resize event.
350. */
351. debounceResize: function() {
352. if (!this.resizeTimerId_) {
353. this.resizeTimerId_ =
354. setInterval(this.adjustDimensions.bind(this), 250);
355. }
356. },
357.
358. /**
359. * Adjust game space dimensions on resize.
360. */
361. adjustDimensions: function() {
362. clearInterval(this.resizeTimerId_);
363. this.resizeTimerId_ = null;
364.
365. var boxStyles = window.getComputedStyle(this.outerContainerEl);
366. var padding = Number(boxStyles.paddingLeft.substr(0,
367. boxStyles.paddingLeft.length - 2));
368.
369. this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
370.
371. // Redraw the elements back onto the canvas.
372. if (this.canvas) {
373. this.canvas.width = this.dimensions.WIDTH;
374. this.canvas.height = this.dimensions.HEIGHT;
375.
376. Runner.updateCanvasScaling(this.canvas);
377.
378. this.distanceMeter.calcXPos(this.dimensions.WIDTH);
379. this.clearCanvas();
380. this.horizon.update(0, 0, true);
381. this.tRex.update(0);
382.
383. // Outer container and distance meter.
384. if (this.activated || this.crashed) {
385. this.containerEl.style.width = this.dimensions.WIDTH + 'px';
386. this.containerEl.style.height = this.dimensions.HEIGHT + 'px';
387. this.distanceMeter.update(0, Math.ceil(this.distanceRan));
388. this.stop();
389. } else {
390. this.tRex.draw(0, 0);
391. }
392.
393. // Game over panel.
394. if (this.crashed && this.gameOverPanel) {
395. this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
396. this.gameOverPanel.draw();
397. }
398. }
399. },
400.
401. /**
402. * Play the game intro.
403. * Canvas container width expands out to the full width.
404. */
405. playIntro: function() {
406. if (!this.started && !this.crashed) {
407. this.playingIntro = true;
408. this.tRex.playingIntro = true;
409.
410. // CSS animation definition.
411. var keyframes = '@-webkit-keyframes intro { ' +
412. 'from { width:' + Trex.config.WIDTH + 'px }' +
413. 'to { width: ' + this.dimensions.WIDTH + 'px }' +
414. '}';
415. document.styleSheets[0].insertRule(keyframes, 0);
416.
417. this.containerEl.addEventListener(Runner.events.ANIM_END,
418. this.startGame.bind(this));
419.
420. this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';
421. this.containerEl.style.width = this.dimensions.WIDTH + 'px';
422.
423. if (this.touchController) {
424. this.outerContainerEl.appendChild(this.touchController);
425. }
426. this.activated = true;
427. this.started = true;
428. } else if (this.crashed) {
429. this.restart();
430. }
431. },
432.
433.
434. /**
435. * Update the game status to started.
436. */
437. startGame: function() {
438. this.runningTime = 0;
439. this.playingIntro = false;
440. this.tRex.playingIntro = false;
441. this.containerEl.style.webkitAnimation = '';
442. this.playCount++;
443.
444. // Handle tabbing off the page. Pause the current game.
445. window.addEventListener(Runner.events.VISIBILITY,
446. this.onVisibilityChange.bind(this));
447.
448. window.addEventListener(Runner.events.BLUR,
449. this.onVisibilityChange.bind(this));
450.
451. window.addEventListener(Runner.events.FOCUS,
452. this.onVisibilityChange.bind(this));
453. },
454.
455. clearCanvas: function() {
456. this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH,
457. this.dimensions.HEIGHT);
458. },
459.
460. /**
461. * Update the game frame.
462. */
463. update: function() {
464. this.drawPending = false;
465.
466. var now = getTimeStamp();
467. var deltaTime = now - (this.time || now);
468. this.time = now;
469.
470. if (this.activated) {
471. this.clearCanvas();
472.
473. if (this.tRex.jumping) {
474. this.tRex.updateJump(deltaTime, this.config);
475. }
476.
477. this.runningTime += deltaTime;
478. var hasObstacles = this.runningTime > this.config.CLEAR_TIME;
479.
480. // First jump triggers the intro.
481. if (this.tRex.jumpCount == 1 && !this.playingIntro) {
482. this.playIntro();
483. }
484.
485. // The horizon doesn't move until the intro is over.
486. if (this.playingIntro) {
487. this.horizon.update(0, this.currentSpeed, hasObstacles);
488. } else {
489. deltaTime = !this.started ? 0 : deltaTime;
490. this.horizon.update(deltaTime, this.currentSpeed, hasObstacles);
491. }
492.
493. // Check for collisions.
494. var collision = hasObstacles &&
495. checkForCollision(this.horizon.obstacles[0], this.tRex);
496.
497. if (!collision) {
498. this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
499.
500. if (this.currentSpeed < this.config.MAX_SPEED) {
501. this.currentSpeed += this.config.ACCELERATION;
502. }
503. } else {
504. this.gameOver();
505. }
506.
507. if (this.distanceMeter.getActualDistance(this.distanceRan) >
508. this.distanceMeter.maxScore) {
509. this.distanceRan = 0;
510. }
511.
512. var playAcheivementSound = this.distanceMeter.update(deltaTime,
513. Math.ceil(this.distanceRan));
514.
515. if (playAcheivementSound) {
516. this.playSound(this.soundFx.SCORE);
517. }
518. }
519.
520. if (!this.crashed) {
521. this.tRex.update(deltaTime);
522. this.raq();
523. }
524. },
525.
526. /**
527. * Event handler.
528. */
529. handleEvent: function(e) {
530. return (function(evtType, events) {
531. switch (evtType) {
532. case events.KEYDOWN:
533. case events.TOUCHSTART:
534. case events.MOUSEDOWN:
535. this.onKeyDown(e);
536. break;
537. case events.KEYUP:
538. case events.TOUCHEND:
539. case events.MOUSEUP:
540. this.onKeyUp(e);
541. break;
542. }
543. }.bind(this))(e.type, Runner.events);
544. },
545.
546. /**
547. * Bind relevant key / mouse / touch listeners.
548. */
549. startListening: function() {
550. // Keys.
551. document.addEventListener(Runner.events.KEYDOWN, this);
552. document.addEventListener(Runner.events.KEYUP, this);
553.
554. if (IS_MOBILE) {
555. // Mobile only touch devices.
556. this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
557. this.touchController.addEventListener(Runner.events.TOUCHEND, this);
558. this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);
559. } else {
560. // Mouse.
561. document.addEventListener(Runner.events.MOUSEDOWN, this);
562. document.addEventListener(Runner.events.MOUSEUP, this);
563. }
564. },
565.
566. /**
567. * Remove all listeners.
568. */
569. stopListening: function() {
570. document.removeEventListener(Runner.events.KEYDOWN, this);
571. document.removeEventListener(Runner.events.KEYUP, this);
572.
573. if (IS_MOBILE) {
574. this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);
575. this.touchController.removeEventListener(Runner.events.TOUCHEND, this);
576. this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);
577. } else {
578. document.removeEventListener(Runner.events.MOUSEDOWN, this);
579. document.removeEventListener(Runner.events.MOUSEUP, this);
580. }
581. },
582.
583. /**
584. * Process keydown.
585. * @param {Event} e
586. */
587. onKeyDown: function(e) {
588. if (e.target != this.detailsButton) {
589. if (!this.crashed && (Runner.keycodes.JUMP[String(e.keyCode)] ||
590. e.type == Runner.events.TOUCHSTART)) {
591. if (!this.activated) {
592. this.loadSounds();
593. this.activated = true;
594. }
595.
596. if (!this.tRex.jumping) {
597. this.playSound(this.soundFx.BUTTON_PRESS);
598. this.tRex.startJump();
599. }
600. }
601.
602. if (this.crashed && e.type == Runner.events.TOUCHSTART &&
603. e.currentTarget == this.containerEl) {
604. this.restart();
605. }
606. }
607.
608. // Speed drop, activated only when jump key is not pressed.
609. if (Runner.keycodes.DUCK[e.keyCode] && this.tRex.jumping) {
610. e.preventDefault();
611. this.tRex.setSpeedDrop();
612. }
613. },
614.
615.
616. /**
617. * Process key up.
618. * @param {Event} e
619. */
620. onKeyUp: function(e) {
621. var keyCode = String(e.keyCode);
622. var isjumpKey = Runner.keycodes.JUMP[keyCode] ||
623. e.type == Runner.events.TOUCHEND ||
624. e.type == Runner.events.MOUSEDOWN;
625.
626. if (this.isRunning() && isjumpKey) {
627. this.tRex.endJump();
628. } else if (Runner.keycodes.DUCK[keyCode]) {
629. this.tRex.speedDrop = false;
630. } else if (this.crashed) {
631. // Check that enough time has elapsed before allowing jump key to restart.
632. var deltaTime = getTimeStamp() - this.time;
633.
634. if (Runner.keycodes.RESTART[keyCode] ||
635. (e.type == Runner.events.MOUSEUP && e.target == this.canvas) ||
636. (deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
637. Runner.keycodes.JUMP[keyCode])) {
638. this.restart();
639. }
640. } else if (this.paused && isjumpKey) {
641. this.play();
642. }
643. },
644.
645. /**
646. * RequestAnimationFrame wrapper.
647. */
648. raq: function() {
649. if (!this.drawPending) {
650. this.drawPending = true;
651. this.raqId = requestAnimationFrame(this.update.bind(this));
652. }
653. },
654.
655. /**
656. * Whether the game is running.
657. * @return {boolean}
658. */
659. isRunning: function() {
660. return !!this.raqId;
661. },
662.
663. /**
664. * Game over state.
665. */
666. gameOver: function() {
667. this.playSound(this.soundFx.HIT);
668. vibrate(200);
669.
670. this.stop();
671. this.crashed = true;
672. this.distanceMeter.acheivement = false;
673.
674. this.tRex.update(100, Trex.status.CRASHED);
675.
676. // Game over panel.
677. if (!this.gameOverPanel) {
678. this.gameOverPanel = new GameOverPanel(this.canvas,
679. this.images.TEXT_SPRITE, this.images.RESTART,
680. this.dimensions);
681. } else {
682. this.gameOverPanel.draw();
683. }
684.
685. // Update the high score.
686. if (this.distanceRan > this.highestScore) {
687. this.highestScore = Math.ceil(this.distanceRan);
688. this.distanceMeter.setHighScore(this.highestScore);
689. }
690.
691. // Reset the time clock.
692. this.time = getTimeStamp();
693. },
694.
695. stop: function() {
696. this.activated = false;
697. this.paused = true;
698. cancelAnimationFrame(this.raqId);
699. this.raqId = 0;
700. },
701.
702. play: function() {
703. if (!this.crashed) {
704. this.activated = true;
705. this.paused = false;
706. this.tRex.update(0, Trex.status.RUNNING);
707. this.time = getTimeStamp();
708. this.update();
709. }
710. },
711.
712. restart: function() {
713. if (!this.raqId) {
714. this.playCount++;
715. this.runningTime = 0;
716. this.activated = true;
717. this.crashed = false;
718. this.distanceRan = 0;
719. this.setSpeed(this.config.SPEED);
720.
721. this.time = getTimeStamp();
722. this.containerEl.classList.remove(Runner.classes.CRASHED);
723. this.clearCanvas();
724. this.distanceMeter.reset(this.highestScore);
725. this.horizon.reset();
726. this.tRex.reset();
727. this.playSound(this.soundFx.BUTTON_PRESS);
728.
729. this.update();
730. }
731. },
732.
733. /**
734. * Pause the game if the tab is not in focus.
735. */
736. onVisibilityChange: function(e) {
737. if (document.hidden || document.webkitHidden || e.type == 'blur') {
738. this.stop();
739. } else {
740. this.play();
741. }
742. },
743.
744. /**
745. * Play a sound.
746. * @param {SoundBuffer} soundBuffer
747. */
748. playSound: function(soundBuffer) {
749. if (soundBuffer) {
750. var sourceNode = this.audioContext.createBufferSource();
751. sourceNode.buffer = soundBuffer;
752. sourceNode.connect(this.audioContext.destination);
753. sourceNode.start(0);
754. }
755. }
756.};
757.
758.
759./**
760. * Updates the canvas size taking into
761. * account the backing store pixel ratio and
762. * the device pixel ratio.
763. *
764. * See article by Paul Lewis:
765. *http://www.html5rocks.com/en/tutorials/canvas/hidpi/
766. *
767. * @param {HTMLCanvasElement} canvas
768. * @param {number} opt_width
769. * @param {number} opt_height
770. * @return {boolean} Whether the canvas was scaled.
771. */
772.Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {
773. var context = canvas.getContext('2d');
774.
775. // Query the various pixel ratios
776. var devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
777. var backingStoreRatio = Math.floor(context.webkitBackingStorePixelRatio) || 1;
778. var ratio = devicePixelRatio / backingStoreRatio;
779.
780. // Upscale the canvas if the two ratios don't match
781. if (devicePixelRatio !== backingStoreRatio) {
782.
783. var oldWidth = opt_width || canvas.width;
784. var oldHeight = opt_height || canvas.height;
785.
786. canvas.width = oldWidth * ratio;
787. canvas.height = oldHeight * ratio;
788.
789. canvas.style.width = oldWidth + 'px';
790. canvas.style.height = oldHeight + 'px';
791.
792. // Scale the context to counter the fact that we've manually scaled
793. // our canvas element.
794. context.scale(ratio, ratio);
795. return true;
796. }
797. return false;
798.};
799.
800.
801./**
802. * Get random number.
803. * @param {number} min
804. * @param {number} max
805. * @param {number}
806. */
807.function getRandomNum(min, max) {
808. return Math.floor(Math.random() * (max - min + 1)) + min;
809.}
810.
811.
812./**
813. * Vibrate on mobile devices.
814. * @param {number} duration Duration of the vibration in milliseconds.
815. */
816.function vibrate(duration) {
817. if (IS_MOBILE && window.navigator.vibrate) {
818. window.navigator.vibrate(duration);
819. }
820.}
821.
822.
823./**
824. * Create canvas element.
825. * @param {HTMLElement} container Element to append canvas to.
826. * @param {number} width
827. * @param {number} height
828. * @param {string} opt_classname
829. * @return {HTMLCanvasElement}
830. */
831.function createCanvas(container, width, height, opt_classname) {
832. var canvas = document.createElement('canvas');
833. canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' +
834. opt_classname : Runner.classes.CANVAS;
835. canvas.width = width;
836. canvas.height = height;
837. container.appendChild(canvas);
838.
839. return canvas;
840.}
841.
842.
843./**
844. * Decodes the base 64 audio to ArrayBuffer used by Web Audio.
845. * @param {string} base64String
846. */
847.function decodeBase64ToArrayBuffer(base64String) {
848. var len = (base64String.length / 4) * 3;
849. var str = atob(base64String);
850. var arrayBuffer = new ArrayBuffer(len);
851. var bytes = new Uint8Array(arrayBuffer);
852.
853. for (var i = 0; i < len; i++) {
854. bytes = str.charCodeAt(i);
855. }
856. return bytes.buffer;
857.}
858.
859.
860./**
861. * Return the current timestamp.
862. * @return {number}
863. */
864.function getTimeStamp() {
865. return IS_IOS ? new Date().getTime() : performance.now();
866.}
867.
868.
869.//******************************************************************************
870.
871.
872./**
873. * Game over panel.
874. * @param {!HTMLCanvasElement} canvas
875. * @param {!HTMLImage} textSprite
876. * @param {!HTMLImage} restartImg
877. * @param {!Object} dimensions Canvas dimensions.
878. * @constructor
879. */
880.function GameOverPanel(canvas, textSprite, restartImg, dimensions) {
881. this.canvas = canvas;
882. this.canvasCtx = canvas.getContext('2d');
883. this.canvasDimensions = dimensions;
884. this.textSprite = textSprite;
885. this.restartImg = restartImg;
886. this.draw();
887.};
888.
889.
890./**
891. * Dimensions used in the panel.
892. * @enum {number}
893. */
894.GameOverPanel.dimensions = {
895. TEXT_X: 0,
896. TEXT_Y: 13,
897. TEXT_WIDTH: 191,
898. TEXT_HEIGHT: 11,
899. RESTART_WIDTH: 36,
900. RESTART_HEIGHT: 32
901.};
902.
903.
904.GameOverPanel.prototype = {
905. /**
906. * Update the panel dimensions.
907. * @param {number} width New canvas width.
908. * @param {number} opt_height Optional new canvas height.
909. */
910. updateDimensions: function(width, opt_height) {
911. this.canvasDimensions.WIDTH = width;
912. if (opt_height) {
913. this.canvasDimensions.HEIGHT = opt_height;
914. }
915. },
916.
917. /**
918. * Draw the panel.
919. */
920. draw: function() {
921. var dimensions = GameOverPanel.dimensions;
922.
923. var centerX = this.canvasDimensions.WIDTH / 2;
924.
925. // Game over text.
926. var textSourceX = dimensions.TEXT_X;
927. var textSourceY = dimensions.TEXT_Y;
928. var textSourceWidth = dimensions.TEXT_WIDTH;
929. var textSourceHeight = dimensions.TEXT_HEIGHT;
930.
931. var textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
932. var textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
933. var textTargetWidth = dimensions.TEXT_WIDTH;
934. var textTargetHeight = dimensions.TEXT_HEIGHT;
935.
936. var restartSourceWidth = dimensions.RESTART_WIDTH;
937. var restartSourceHeight = dimensions.RESTART_HEIGHT;
938. var restartTargetX = centerX - (dimensions.RESTART_WIDTH / 2);
939. var restartTargetY = this.canvasDimensions.HEIGHT / 2;
940.
941. if (IS_HIDPI) {
942. textSourceY *= 2;
943. textSourceX *= 2;
944. textSourceWidth *= 2;
945. textSourceHeight *= 2;
946. restartSourceWidth *= 2;
947. restartSourceHeight *= 2;
948. }
949.
950. // Game over text from sprite.
951. this.canvasCtx.drawImage(this.textSprite,
952. textSourceX, textSourceY, textSourceWidth, textSourceHeight,
953. textTargetX, textTargetY, textTargetWidth, textTargetHeight);
954.
955. // Restart button.
956. this.canvasCtx.drawImage(this.restartImg, 0, 0,
957. restartSourceWidth, restartSourceHeight,
958. restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
959. dimensions.RESTART_HEIGHT);
960. }
961.};
962.
963.
964.//******************************************************************************
965.
966./**
967. * Check for a collision.
968. * @param {!Obstacle} obstacle
969. * @param {!Trex} tRex T-rex object.
970. * @param {HTMLCanvasContext} opt_canvasCtx Optional canvas context for drawing
971. * collision boxes.
972. * @return {Array.<CollisionBox>}
973. */
974.function checkForCollision(obstacle, tRex, opt_canvasCtx) {
975. var obstacleBoxXPos = Runner.defaultDimensions.WIDTH + obstacle.xPos;
976.
977. // Adjustments are made to the bounding box as there is a 1 pixel white
978. // border around the t-rex and obstacles.
979. var tRexBox = new CollisionBox(
980. tRex.xPos + 1,
981. tRex.yPos + 1,
982. tRex.config.WIDTH - 2,
983. tRex.config.HEIGHT - 2);
984.
985. var obstacleBox = new CollisionBox(
986. obstacle.xPos + 1,
987. obstacle.yPos + 1,
988. obstacle.typeConfig.width * obstacle.size - 2,
989. obstacle.typeConfig.height - 2);
990.
991. // Debug outer box
992. if (opt_canvasCtx) {
993. drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);
994. }
995.
996. // Simple outer bounds check.
997. if (boxCompare(tRexBox, obstacleBox)) {
998. var collisionBoxes = obstacle.collisionBoxes;
999. var tRexCollisionBoxes = Trex.collisionBoxes;
1000.
1001. // Detailed axis aligned box check.
1002. for (var t = 0; t < tRexCollisionBoxes.length; t++) {
1003. for (var i = 0; i < collisionBoxes.length; i++) {
1004. // Adjust the box to actual positions.
1005. var adjTrexBox =
1006. createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
1007. var adjObstacleBox =
1008. createAdjustedCollisionBox(collisionBoxes, obstacleBox);
1009. var crashed = boxCompare(adjTrexBox, adjObstacleBox);
1010.
1011. // Draw boxes for debug.
1012. if (opt_canvasCtx) {
1013. drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
1014. }
1015.
1016. if (crashed) {
1017. return [adjTrexBox, adjObstacleBox];
1018. }
1019. }
1020. }
1021. }
1022. return false;
1023.};
1024.
1025.
1026./**
1027. * Adjust the collision box.
1028. * @param {!CollisionBox} box The original box.
1029. * @param {!CollisionBox} adjustment Adjustment box.
1030. * @return {CollisionBox} The adjusted collision box object.
1031. */
1032.function createAdjustedCollisionBox(box, adjustment) {
1033. return new CollisionBox(
1034. box.x + adjustment.x,
1035. box.y + adjustment.y,
1036. box.width,
1037. box.height);
1038.};
1039.
1040.
1041./**
1042. * Draw the collision boxes for debug.
1043. */
1044.function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
1045. canvasCtx.save();
1046. canvasCtx.strokeStyle = '#f00';
1047. canvasCtx.strokeRect(tRexBox.x, tRexBox.y,
1048. tRexBox.width, tRexBox.height);
1049.
1050. canvasCtx.strokeStyle = '#0f0';
1051. canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
1052. obstacleBox.width, obstacleBox.height);
1053. canvasCtx.restore();
1054.};
1055.
1056.
1057./**
1058. * Compare two collision boxes for a collision.
1059. * @param {CollisionBox} tRexBox
1060. * @param {CollisionBox} obstacleBox
1061. * @return {boolean} Whether the boxes intersected.
1062. */
1063.function boxCompare(tRexBox, obstacleBox) {
1064. var crashed = false;
1065. var tRexBoxX = tRexBox.x;
1066. var tRexBoxY = tRexBox.y;
1067.
1068. var obstacleBoxX = obstacleBox.x;
1069. var obstacleBoxY = obstacleBox.y;
1070.
1071. // Axis-Aligned Bounding Box method.
1072. if (tRexBox.x < obstacleBoxX + obstacleBox.width &&
1073. tRexBox.x + tRexBox.width > obstacleBoxX &&
1074. tRexBox.y < obstacleBox.y + obstacleBox.height &&
1075. tRexBox.height + tRexBox.y > obstacleBox.y) {
1076. crashed = true;
1077. }
1078.
1079. return crashed;
1080.};
1081.
1082.
1083.//******************************************************************************
1084.
1085./**
1086. * Collision box object.
1087. * @param {number} x X position.
1088. * @param {number} y Y Position.
1089. * @param {number} w Width.
1090. * @param {number} h Height.
1091. */
1092.function CollisionBox(x, y, w, h) {
1093. this.x = x;
1094. this.y = y;
1095. this.width = w;
1096. this.height = h;
1097.};
1098.
1099.
1100.//******************************************************************************
1101.
1102./**
1103. * Obstacle.
1104. * @param {HTMLCanvasCtx} canvasCtx
1105. * @param {Obstacle.type} type
1106. * @param {image} obstacleImg Image sprite.
1107. * @param {Object} dimensions
1108. * @param {number} gapCoefficient Mutipler in determining the gap.
1109. * @param {number} speed
1110. */
1111.function Obstacle(canvasCtx, type, obstacleImg, dimensions,
1112. gapCoefficient, speed) {
1113.
1114. this.canvasCtx = canvasCtx;
1115. this.image = obstacleImg;
1116. this.typeConfig = type;
1117. this.gapCoefficient = gapCoefficient;
1118. this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
1119. this.dimensions = dimensions;
1120. this.remove = false;
1121. this.xPos = 0;
1122. this.yPos = this.typeConfig.yPos;
1123. this.width = 0;
1124. this.collisionBoxes = [];
1125. this.gap = 0;
1126.
1127. this.init(speed);
1128.};
1129.
1130./**
1131. * Coefficient for calculating the maximum gap.
1132. * @const
1133. */
1134.Obstacle.MAX_GAP_COEFFICIENT = 1.5;
1135.
1136./**
1137. * Maximum obstacle grouping count.
1138. * @const
1139. */
1140.Obstacle.MAX_OBSTACLE_LENGTH = 3,
1141.
1142.
1143.Obstacle.prototype = {
1144. /**
1145. * Initialise the DOM for the obstacle.
1146. * @param {number} speed
1147. */
1148. init: function(speed) {
1149. this.cloneCollisionBoxes();
1150.
1151. // Only allow sizing if we're at the right speed.
1152. if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {
1153. this.size = 1;
1154. }
1155.
1156. this.width = this.typeConfig.width * this.size;
1157. this.xPos = this.dimensions.WIDTH - this.width;
1158.
1159. this.draw();
1160.
1161. // Make collision box adjustments,
1162. // Central box is adjusted to the size as one box.
1163. // ____ ______ ________
1164. // _| |-| _| |-| _| |-|
1165. // | |<->| | | |<--->| | | |<----->| |
1166. // | | 1 | | | | 2 | | | | 3 | |
1167. // |_|___|_| |_|_____|_| |_|_______|_|
1168. //
1169. if (this.size > 1) {
1170. this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -
1171. this.collisionBoxes[2].width;
1172. this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;
1173. }
1174.
1175. this.gap = this.getGap(this.gapCoefficient, speed);
1176. },
1177.
1178. /**
1179. * Draw and crop based on size.
1180. */
1181. draw: function() {
1182. var sourceWidth = this.typeConfig.width;
1183. var sourceHeight = this.typeConfig.height;
1184.
1185. if (IS_HIDPI) {
1186. sourceWidth = sourceWidth * 2;
1187. sourceHeight = sourceHeight * 2;
1188. }
1189.
1190. // Sprite
1191. var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1));
1192. this.canvasCtx.drawImage(this.image,
1193. sourceX, 0,
1194. sourceWidth * this.size, sourceHeight,
1195. this.xPos, this.yPos,
1196. this.typeConfig.width * this.size, this.typeConfig.height);
1197. },
1198.
1199. /**
1200. * Obstacle frame update.
1201. * @param {number} deltaTime
1202. * @param {number} speed
1203. */
1204. update: function(deltaTime, speed) {
1205. if (!this.remove) {
1206. this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
1207. this.draw();
1208.
1209. if (!this.isVisible()) {
1210. this.remove = true;
1211. }
1212. }
1213. },
1214.
1215. /**
1216. * Calculate a random gap size.
1217. * - Minimum gap gets wider as speed increses
1218. * @param {number} gapCoefficient
1219. * @param {number} speed
1220. * @return {number} The gap size.
1221. */
1222. getGap: function(gapCoefficient, speed) {
1223. var minGap = Math.round(this.width * speed +
1224. this.typeConfig.minGap * gapCoefficient);
1225. var maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
1226. return getRandomNum(minGap, maxGap);
1227. },
1228.
1229. /**
1230. * Check if obstacle is visible.
1231. * @return {boolean} Whether the obstacle is in the game area.
1232. */
1233. isVisible: function() {
1234. return this.xPos + this.width > 0;
1235. },
1236.
1237. /**
1238. * Make a copy of the collision boxes, since these will change based on
1239. * obstacle type and size.
1240. */
1241. cloneCollisionBoxes: function() {
1242. var collisionBoxes = this.typeConfig.collisionBoxes;
1243.
1244. for (var i = collisionBoxes.length - 1; i >= 0; i--) {
1245. this.collisionBoxes = new CollisionBox(collisionBoxes.x,
1246. collisionBoxes.y, collisionBoxes.width,
1247. collisionBoxes.height);
1248. }
1249. }
1250.};
1251.
1252.
1253./**
1254. * Obstacle definitions.
1255. * minGap: minimum pixel space betweeen obstacles.
1256. * multipleSpeed: Speed at which multiples are allowed.
1257. */
1258.Obstacle.types = [
1259. {
1260. type: 'CACTUS_SMALL',
1261. className: ' cactus cactus-small ',
1262. width: 17,
1263. height: 35,
1264. yPos: 105,
1265. multipleSpeed: 3,
1266. minGap: 120,
1267. collisionBoxes: [
1268. new CollisionBox(0, 7, 5, 27),
1269. new CollisionBox(4, 0, 6, 34),
1270. new CollisionBox(10, 4, 7, 14)
1271. ]
1272. },
1273. {
1274. type: 'CACTUS_LARGE',
1275. className: ' cactus cactus-large ',
1276. width: 25,
1277. height: 50,
1278. yPos: 90,
1279. multipleSpeed: 6,
1280. minGap: 120,
1281. collisionBoxes: [
1282. new CollisionBox(0, 12, 7, 38),
1283. new CollisionBox(8, 0, 7, 49),
1284. new CollisionBox(13, 10, 10, 38)
1285. ]
1286. }
1287.];
1288.
1289.
1290.//******************************************************************************
1291./**
1292. * T-rex game character.
1293. * @param {HTMLCanvas} canvas
1294. * @param {HTMLImage} image Character image.
1295. * @constructor
1296. */
1297.function Trex(canvas, image) {
1298. this.canvas = canvas;
1299. this.canvasCtx = canvas.getContext('2d');
1300. this.image = image;
1301. this.xPos = 0;
1302. this.yPos = 0;
1303. // Position when on the ground.
1304. this.groundYPos = 0;
1305. this.currentFrame = 0;
1306. this.currentAnimFrames = [];
1307. this.blinkDelay = 0;
1308. this.animStartTime = 0;
1309. this.timer = 0;
1310. this.msPerFrame = 1000 / FPS;
1311. this.config = Trex.config;
1312. // Current status.
1313. this.status = Trex.status.WAITING;
1314.
1315. this.jumping = false;
1316. this.jumpVelocity = 0;
1317. this.reachedMinHeight = false;
1318. this.speedDrop = false;
1319. this.jumpCount = 0;
1320. this.jumpspotX = 0;
1321.
1322. this.init();
1323.};
1324.
1325.
1326./**
1327. * T-rex player config.
1328. * @enum {number}
1329. */
1330.Trex.config = {
1331. DROP_VELOCITY: -5,
1332. GRAVITY: 0.6,
1333. HEIGHT: 47,
1334. INIITAL_JUMP_VELOCITY: -10,
1335. INTRO_DURATION: 1500,
1336. MAX_JUMP_HEIGHT: 30,
1337. MIN_JUMP_HEIGHT: 30,
1338. SPEED_DROP_COEFFICIENT: 3,
1339. SPRITE_WIDTH: 262,
1340. START_X_POS: 50,
1341. WIDTH: 44
1342.};
1343.
1344.
1345./**
1346. * Used in collision detection.
1347. * @type {Array.<CollisionBox>}
1348. */
1349.Trex.collisionBoxes = [
1350. new CollisionBox(1, -1, 30, 26),
1351. new CollisionBox(32, 0, 8, 16),
1352. new CollisionBox(10, 35, 14, 8),
1353. new CollisionBox(1, 24, 29, 5),
1354. new CollisionBox(5, 30, 21, 4),
1355. new CollisionBox(9, 34, 15, 4)
1356.];
1357.
1358.
1359./**
1360. * Animation states.
1361. * @enum {string}
1362. */
1363.Trex.status = {
1364. CRASHED: 'CRASHED',
1365. JUMPING: 'JUMPING',
1366. RUNNING: 'RUNNING',
1367. WAITING: 'WAITING'
1368.};
1369.
1370./**
1371. * Blinking coefficient.
1372. * @const
1373. */
1374.Trex.BLINK_TIMING = 7000;
1375.
1376.
1377./**
1378. * Animation config for different states.
1379. * @enum {object}
1380. */
1381.Trex.animFrames = {
1382. WAITING: {
1383. frames: [44, 0],
1384. msPerFrame: 1000 / 3
1385. },
1386. RUNNING: {
1387. frames: [88, 132],
1388. msPerFrame: 1000 / 12
1389. },
1390. CRASHED: {
1391. frames: [220],
1392. msPerFrame: 1000 / 60
1393. },
1394. JUMPING: {
1395. frames: [0],
1396. msPerFrame: 1000 / 60
1397. }
1398.};
1399.
1400.
1401.Trex.prototype = {
1402. /**
1403. * T-rex player initaliser.
1404. * Sets the t-rex to blink at random intervals.
1405. */
1406. init: function() {
1407. this.blinkDelay = this.setBlinkDelay();
1408. this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
1409. Runner.config.BOTTOM_PAD;
1410. this.yPos = this.groundYPos;
1411. this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;
1412.
1413. this.draw(0, 0);
1414. this.update(0, Trex.status.WAITING);
1415. },
1416.
1417. /**
1418. * Setter for the jump velocity.
1419. * The approriate drop velocity is also set.
1420. */
1421. setJumpVelocity: function(setting) {
1422. this.config.INIITAL_JUMP_VELOCITY = -setting;
1423. this.config.DROP_VELOCITY = -setting / 2;
1424. },
1425.
1426. /**
1427. * Set the animation status.
1428. * @param {!number} deltaTime
1429. * @param {Trex.status} status Optional status to switch to.
1430. */
1431. update: function(deltaTime, opt_status) {
1432. this.timer += deltaTime;
1433.
1434. // Update the status.
1435. if (opt_status) {
1436. this.status = opt_status;
1437. this.currentFrame = 0;
1438. this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
1439. this.currentAnimFrames = Trex.animFrames[opt_status].frames;
1440.
1441. if (opt_status == Trex.status.WAITING) {
1442. this.animStartTime = getTimeStamp();
1443. this.setBlinkDelay();
1444. }
1445. }
1446.
1447. // Game intro animation, T-rex moves in from the left.
1448. if (this.playingIntro && this.xPos < this.config.START_X_POS) {
1449. this.xPos += Math.round((this.config.START_X_POS /
1450. this.config.INTRO_DURATION) * deltaTime);
1451. }
1452.
1453. if (this.status == Trex.status.WAITING) {
1454. this.blink(getTimeStamp());
1455. } else {
1456. this.draw(this.currentAnimFrames[this.currentFrame], 0);
1457. }
1458.
1459. // Update the frame position.
1460. if (this.timer >= this.msPerFrame) {
1461. this.currentFrame = this.currentFrame ==
1462. this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
1463. this.timer = 0;
1464. }
1465. },
1466.
1467. /**
1468. * Draw the t-rex to a particular position.
1469. * @param {number} x
1470. * @param {number} y
1471. */
1472. draw: function(x, y) {
1473. var sourceX = x;
1474. var sourceY = y;
1475. var sourceWidth = this.config.WIDTH;
1476. var sourceHeight = this.config.HEIGHT;
1477.
1478. if (IS_HIDPI) {
1479. sourceX *= 2;
1480. sourceY *= 2;
1481. sourceWidth *= 2;
1482. sourceHeight *= 2;
1483. }
1484.
1485. this.canvasCtx.drawImage(this.image, sourceX, sourceY,
1486. sourceWidth, sourceHeight,
1487. this.xPos, this.yPos,
1488. this.config.WIDTH, this.config.HEIGHT);
1489. },
1490.
1491. /**
1492. * Sets a random time for the blink to happen.
1493. */
1494. setBlinkDelay: function() {
1495. this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
1496. },
1497.
1498. /**
1499. * Make t-rex blink at random intervals.
1500. * @param {number} time Current time in milliseconds.
1501. */
1502. blink: function(time) {
1503. var deltaTime = time - this.animStartTime;
1504.
1505. if (deltaTime >= this.blinkDelay) {
1506. this.draw(this.currentAnimFrames[this.currentFrame], 0);
1507.
1508. if (this.currentFrame == 1) {
1509. // Set new random delay to blink.
1510. this.setBlinkDelay();
1511. this.animStartTime = time;
1512. }
1513. }
1514. },
1515.
1516. /**
1517. * Initialise a jump.
1518. */
1519. startJump: function() {
1520. if (!this.jumping) {
1521. this.update(0, Trex.status.JUMPING);
1522. this.jumpVelocity = this.config.INIITAL_JUMP_VELOCITY;
1523. this.jumping = true;
1524. this.reachedMinHeight = false;
1525. this.speedDrop = false;
1526. }
1527. },
1528.
1529. /**
1530. * Jump is complete, falling down.
1531. */
1532. endJump: function() {
1533. if (this.reachedMinHeight &&
1534. this.jumpVelocity < this.config.DROP_VELOCITY) {
1535. this.jumpVelocity = this.config.DROP_VELOCITY;
1536. }
1537. },
1538.
1539. /**
1540. * Update frame for a jump.
1541. * @param {number} deltaTime
1542. */
1543. updateJump: function(deltaTime) {
1544. var msPerFrame = Trex.animFrames[this.status].msPerFrame;
1545. var framesElapsed = deltaTime / msPerFrame;
1546.
1547. // Speed drop makes Trex fall faster.
1548. if (this.speedDrop) {
1549. this.yPos += Math.round(this.jumpVelocity *
1550. this.config.SPEED_DROP_COEFFICIENT * framesElapsed);
1551. } else {
1552. this.yPos += Math.round(this.jumpVelocity * framesElapsed);
1553. }
1554.
1555. this.jumpVelocity += this.config.GRAVITY * framesElapsed;
1556.
1557. // Minimum height has been reached.
1558. if (this.yPos < this.minJumpHeight || this.speedDrop) {
1559. this.reachedMinHeight = true;
1560. }
1561.
1562. // Reached max height
1563. if (this.yPos < this.config.MAX_JUMP_HEIGHT || this.speedDrop) {
1564. this.endJump();
1565. }
1566.
1567. // Back down at ground level. Jump completed.
1568. if (this.yPos > this.groundYPos) {
1569. this.reset();
1570. this.jumpCount++;
1571. }
1572.
1573. this.update(deltaTime);
1574. },
1575.
1576. /**
1577. * Set the speed drop. Immediately cancels the current jump.
1578. */
1579. setSpeedDrop: function() {
1580. this.speedDrop = true;
1581. this.jumpVelocity = 1;
1582. },
1583.
1584. /**
1585. * Reset the t-rex to running at start of game.
1586. */
1587. reset: function() {
1588. this.yPos = this.groundYPos;
1589. this.jumpVelocity = 0;
1590. this.jumping = false;
1591. this.update(0, Trex.status.RUNNING);
1592. this.midair = false;
1593. this.speedDrop = false;
1594. this.jumpCount = 0;
1595. }
1596.};
1597.
1598.
1599.//******************************************************************************
1600.
1601./**
1602. * Handles displaying the distance meter.
1603. * @param {!HTMLCanvasElement} canvas
1604. * @param {!HTMLImage} spriteSheet Image sprite.
1605. * @param {number} canvasWidth
1606. * @constructor
1607. */
1608.function DistanceMeter(canvas, spriteSheet, canvasWidth) {
1609. this.canvas = canvas;
1610. this.canvasCtx = canvas.getContext('2d');
1611. this.image = spriteSheet;
1612. this.x = 0;
1613. this.y = 5;
1614.
1615. this.currentDistance = 0;
1616. this.maxScore = 0;
1617. this.highScore = 0;
1618. this.container = null;
1619.
1620. this.digits = [];
1621. this.acheivement = false;
1622. this.defaultString = '';
1623. this.flashTimer = 0;
1624. this.flashIterations = 0;
1625.
1626. this.config = DistanceMeter.config;
1627. this.init(canvasWidth);
1628.};
1629.
1630.
1631./**
1632. * @enum {number}
1633. */
1634.DistanceMeter.dimensions = {
1635. WIDTH: 10,
1636. HEIGHT: 13,
1637. DEST_WIDTH: 11
1638.};
1639.
1640.
1641./**
1642. * Y positioning of the digits in the sprite sheet.
1643. * X position is always 0.
1644. * @type {array.<number>}
1645. */
1646.DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];
1647.
1648.
1649./**
1650. * Distance meter config.
1651. * @enum {number}
1652. */
1653.DistanceMeter.config = {
1654. // Number of digits.
1655. MAX_DISTANCE_UNITS: 5,
1656.
1657. // Distance that causes achievement animation.
1658. ACHIEVEMENT_DISTANCE: 100,
1659.
1660. // Used for conversion from pixel distance to a scaled unit.
1661. COEFFICIENT: 0.025,
1662.
1663. // Flash duration in milliseconds.
1664. FLASH_DURATION: 1000 / 4,
1665.
1666. // Flash iterations for achievement animation.
1667. FLASH_ITERATIONS: 3
1668.};
1669.
1670.
1671.DistanceMeter.prototype = {
1672. /**
1673. * Initialise the distance meter to '00000'.
1674. * @param {number} width Canvas width in px.
1675. */
1676. init: function(width) {
1677. var maxDistanceStr = '';
1678.
1679. this.calcXPos(width);
1680. this.maxScore = this.config.MAX_DISTANCE_UNITS;
1681. for (var i = 0; i < this.config.MAX_DISTANCE_UNITS; i++) {
1682. this.draw(i, 0);
1683. this.defaultString += '0';
1684. maxDistanceStr += '9';
1685. }
1686.
1687. this.maxScore = parseInt(maxDistanceStr);
1688. },
1689.
1690. /**
1691. * Calculate the xPos in the canvas.
1692. * @param {number} canvasWidth
1693. */
1694. calcXPos: function(canvasWidth) {
1695. this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *
1696. (this.config.MAX_DISTANCE_UNITS + 1));
1697. },
1698.
1699. /**
1700. * Draw a digit to canvas.
1701. * @param {number} digitPos Position of the digit.
1702. * @param {number} value Digit value 0-9.
1703. * @param {boolean} opt_highScore Whether drawing the high score.
1704. */
1705. draw: function(digitPos, value, opt_highScore) {
1706. var sourceWidth = DistanceMeter.dimensions.WIDTH;
1707. var sourceHeight = DistanceMeter.dimensions.HEIGHT;
1708. var sourceX = DistanceMeter.dimensions.WIDTH * value;
1709.
1710. var targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
1711. var targetY = this.y;
1712. var targetWidth = DistanceMeter.dimensions.WIDTH;
1713. var targetHeight = DistanceMeter.dimensions.HEIGHT;
1714.
1715. // For high DPI we 2x source values.
1716. if (IS_HIDPI) {
1717. sourceWidth *= 2;
1718. sourceHeight *= 2;
1719. sourceX *= 2;
1720. }
1721.
1722. this.canvasCtx.save();
1723.
1724. if (opt_highScore) {
1725. // Left of the current score.
1726. var highScoreX = this.x - (this.config.MAX_DISTANCE_UNITS * 2) *
1727. DistanceMeter.dimensions.WIDTH;
1728. this.canvasCtx.translate(highScoreX, this.y);
1729. } else {
1730. this.canvasCtx.translate(this.x, this.y);
1731. }
1732.
1733. this.canvasCtx.drawImage(this.image, sourceX, 0,
1734. sourceWidth, sourceHeight,
1735. targetX, targetY,
1736. targetWidth, targetHeight
1737. );
1738.
1739. this.canvasCtx.restore();
1740. },
1741.
1742. /**
1743. * Covert pixel distance to a 'real' distance.
1744. * @param {number} distance Pixel distance ran.
1745. * @return {number} The 'real' distance ran.
1746. */
1747. getActualDistance: function(distance) {
1748. return distance ?
1749. Math.round(distance * this.config.COEFFICIENT) : 0;
1750. },
1751.
1752. /**
1753. * Update the distance meter.
1754. * @param {number} deltaTime
1755. * @param {number} distance
1756. * @return {boolean} Whether the acheivement sound fx should be played.
1757. */
1758. update: function(deltaTime, distance) {
1759. var paint = true;
1760. var playSound = false;
1761.
1762. if (!this.acheivement) {
1763. distance = this.getActualDistance(distance);
1764.
1765. if (distance > 0) {
1766. // Acheivement unlocked
1767. if (distance % this.config.ACHIEVEMENT_DISTANCE == 0) {
1768. // Flash score and play sound.
1769. this.acheivement = true;
1770. this.flashTimer = 0;
1771. playSound = true;
1772. }
1773.
1774. // Create a string representation of the distance with leading 0.
1775. var distanceStr = (this.defaultString +
1776. distance).substr(-this.config.MAX_DISTANCE_UNITS);
1777. this.digits = distanceStr.split('');
1778. } else {
1779. this.digits = this.defaultString.split('');
1780. }
1781. } else {
1782. // Control flashing of the score on reaching acheivement.
1783. if (this.flashIterations <= this.config.FLASH_ITERATIONS) {
1784. this.flashTimer += deltaTime;
1785.
1786. if (this.flashTimer < this.config.FLASH_DURATION) {
1787. paint = false;
1788. } else if (this.flashTimer >
1789. this.config.FLASH_DURATION * 2) {
1790. this.flashTimer = 0;
1791. this.flashIterations++;
1792. }
1793. } else {
1794. this.acheivement = false;
1795. this.flashIterations = 0;
1796. this.flashTimer = 0;
1797. }
1798. }
1799.
1800. // Draw the digits if not flashing.
1801. if (paint) {
1802. for (var i = this.digits.length - 1; i >= 0; i--) {
1803. this.draw(i, parseInt(this.digits));
1804. }
1805. }
1806.
1807. this.drawHighScore();
1808.
1809. return playSound;
1810. },
1811.
1812. /**
1813. * Draw the high score.
1814. */
1815. drawHighScore: function() {
1816. this.canvasCtx.save();
1817. this.canvasCtx.globalAlpha = .8;
1818. for (var i = this.highScore.length - 1; i >= 0; i--) {
1819. this.draw(i, parseInt(this.highScore, 10), true);
1820. }
1821. this.canvasCtx.restore();
1822. },
1823.
1824. /**
1825. * Set the highscore as a array string.
1826. * Position of char in the sprite: H - 10, I - 11.
1827. * @param {number} distance Distance ran in pixels.
1828. */
1829. setHighScore: function(distance) {
1830. distance = this.getActualDistance(distance);
1831. var highScoreStr = (this.defaultString +
1832. distance).substr(-this.config.MAX_DISTANCE_UNITS);
1833.
1834. this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));
1835. },
1836.
1837. /**
1838. * Reset the distance meter back to '00000'.
1839. */
1840. reset: function() {
1841. this.update(0);
1842. this.acheivement = false;
1843. }
1844.};
1845.
1846.
1847.//******************************************************************************
1848.
1849./**
1850. * Cloud background item.
1851. * Similar to an obstacle object but without collision boxes.
1852. * @param {HTMLCanvasElement} canvas Canvas element.
1853. * @param {Image} cloudImg
1854. * @param {number} containerWidth
1855. */
1856.function Cloud(canvas, cloudImg, containerWidth) {
1857. this.canvas = canvas;
1858. this.canvasCtx = this.canvas.getContext('2d');
1859. this.image = cloudImg;
1860. this.containerWidth = containerWidth;
1861. this.xPos = containerWidth;
1862. this.yPos = 0;
1863. this.remove = false;
1864. this.cloudGap = getRandomNum(Cloud.config.MIN_CLOUD_GAP,
1865. Cloud.config.MAX_CLOUD_GAP);
1866.
1867. this.init();
1868.};
1869.
1870.
1871./**
1872. * Cloud object config.
1873. * @enum {number}
1874. */
1875.Cloud.config = {
1876. HEIGHT: 14,
1877. MAX_CLOUD_GAP: 400,
1878. MAX_SKY_LEVEL: 30,
1879. MIN_CLOUD_GAP: 100,
1880. MIN_SKY_LEVEL: 71,
1881. WIDTH: 46
1882.};
1883.
1884.
1885.Cloud.prototype = {
1886. /**
1887. * Initialise the cloud. Sets the Cloud height.
1888. */
1889. init: function() {
1890. this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
1891. Cloud.config.MIN_SKY_LEVEL);
1892. this.draw();
1893. },
1894.
1895. /**
1896. * Draw the cloud.
1897. */
1898. draw: function() {
1899. this.canvasCtx.save();
1900. var sourceWidth = Cloud.config.WIDTH;
1901. var sourceHeight = Cloud.config.HEIGHT;
1902.
1903. if (IS_HIDPI) {
1904. sourceWidth = sourceWidth * 2;
1905. sourceHeight = sourceHeight * 2;
1906. }
1907.
1908. this.canvasCtx.drawImage(this.image, 0, 0,
1909. sourceWidth, sourceHeight,
1910. this.xPos, this.yPos,
1911. Cloud.config.WIDTH, Cloud.config.HEIGHT);
1912.
1913. this.canvasCtx.restore();
1914. },
1915.
1916. /**
1917. * Update the cloud position.
1918. * @param {number} speed
1919. */
1920. update: function(speed) {
1921. if (!this.remove) {
1922. this.xPos -= Math.ceil(speed);
1923. this.draw();
1924.
1925. // Mark as removeable if no longer in the canvas.
1926. if (!this.isVisible()) {
1927. this.remove = true;
1928. }
1929. }
1930. },
1931.
1932. /**
1933. * Check if the cloud is visible on the stage.
1934. * @return {boolean}
1935. */
1936. isVisible: function() {
1937. return this.xPos + Cloud.config.WIDTH > 0;
1938. }
1939.};
1940.
1941.
1942.//******************************************************************************
1943.
1944./**
1945. * Horizon Line.
1946. * Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.
1947. * @param {HTMLCanvasElement} canvas
1948. * @param {HTMLImage} bgImg Horizon line sprite.
1949. * @constructor
1950. */
1951.function HorizonLine(canvas, bgImg) {
1952. this.image = bgImg;
1953. this.canvas = canvas;
1954. this.canvasCtx = canvas.getContext('2d');
1955. this.sourceDimensions = {};
1956. this.dimensions = HorizonLine.dimensions;
1957. this.sourceXPos = [0, this.dimensions.WIDTH];
1958. this.xPos = [];
1959. this.yPos = 0;
1960. this.bumpThreshold = 0.5;
1961.
1962. this.setSourceDimensions();
1963. this.draw();
1964.};
1965.
1966.
1967./**
1968. * Horizon line dimensions.
1969. * @enum {number}
1970. */
1971.HorizonLine.dimensions = {
1972. WIDTH: 600,
1973. HEIGHT: 12,
1974. YPOS: 127
1975.};
1976.
1977.
1978.HorizonLine.prototype = {
1979. /**
1980. * Set the source dimensions of the horizon line.
1981. */
1982. setSourceDimensions: function() {
1983.
1984. for (var dimension in HorizonLine.dimensions) {
1985. if (IS_HIDPI) {
1986. if (dimension != 'YPOS') {
1987. this.sourceDimensions[dimension] =
1988. HorizonLine.dimensions[dimension] * 2;
1989. }
1990. } else {
1991. this.sourceDimensions[dimension] =
1992. HorizonLine.dimensions[dimension];
1993. }
1994. this.dimensions[dimension] = HorizonLine.dimensions[dimension];
1995. }
1996.
1997. this.xPos = [0, HorizonLine.dimensions.WIDTH];
1998. this.yPos = HorizonLine.dimensions.YPOS;
1999. },
2000.
2001. /**
2002. * Return the crop x position of a type.
2003. */
2004. getRandomType: function() {
2005. return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
2006. },
2007.
2008. /**
2009. * Draw the horizon line.
2010. */
2011. draw: function() {
2012. this.canvasCtx.drawImage(this.image, this.sourceXPos[0], 0,
2013. this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
2014. this.xPos[0], this.yPos,
2015. this.dimensions.WIDTH, this.dimensions.HEIGHT);
2016.
2017. this.canvasCtx.drawImage(this.image, this.sourceXPos[1], 0,
2018. this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
2019. this.xPos[1], this.yPos,
2020. this.dimensions.WIDTH, this.dimensions.HEIGHT);
2021. },
2022.
2023. /**
2024. * Update the x position of an indivdual piece of the line.
2025. * @param {number} pos Line position.
2026. * @param {number} increment
2027. */
2028. updateXPos: function(pos, increment) {
2029. var line1 = pos;
2030. var line2 = pos == 0 ? 1 : 0;
2031.
2032. this.xPos[line1] -= increment;
2033. this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
2034.
2035. if (this.xPos[line1] <= -this.dimensions.WIDTH) {
2036. this.xPos[line1] += this.dimensions.WIDTH * 2;
2037. this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
2038. this.sourceXPos[line1] = this.getRandomType();
2039. }
2040. },
2041.
2042. /**
2043. * Update the horizon line.
2044. * @param {number} deltaTime
2045. * @param {number} speed
2046. */
2047. update: function(deltaTime, speed) {
2048. var increment = Math.floor(speed * (FPS / 1000) * deltaTime);
2049.
2050. if (this.xPos[0] <= 0) {
2051. this.updateXPos(0, increment);
2052. } else {
2053. this.updateXPos(1, increment);
2054. }
2055. this.draw();
2056. },
2057.
2058. /**
2059. * Reset horizon to the starting position.
2060. */
2061. reset: function() {
2062. this.xPos[0] = 0;
2063. this.xPos[1] = HorizonLine.dimensions.WIDTH;
2064. }
2065.};
2066.
2067.
2068.//******************************************************************************
2069.
2070./**
2071. * Horizon background class.
2072. * @param {HTMLCanvasElement} canvas
2073. * @param {Array.<HTMLImageElement>} images
2074. * @param {object} dimensions Canvas dimensions.
2075. * @param {number} gapCoefficient
2076. * @constructor
2077. */
2078.function Horizon(canvas, images, dimensions, gapCoefficient) {
2079. this.canvas = canvas;
2080. this.canvasCtx = this.canvas.getContext('2d');
2081. this.config = Horizon.config;
2082. this.dimensions = dimensions;
2083. this.gapCoefficient = gapCoefficient;
2084. this.obstacles = [];
2085. this.horizonOffsets = [0, 0];
2086. this.cloudFrequency = this.config.CLOUD_FREQUENCY;
2087.
2088. // Cloud
2089. this.clouds = [];
2090. this.cloudImg = images.CLOUD;
2091. this.cloudSpeed = this.config.BG_CLOUD_SPEED;
2092.
2093. // Horizon
2094. this.horizonImg = images.HORIZON;
2095. this.horizonLine = null;
2096.
2097. // Obstacles
2098. this.obstacleImgs = {
2099. CACTUS_SMALL: images.CACTUS_SMALL,
2100. CACTUS_LARGE: images.CACTUS_LARGE
2101. };
2102.
2103. this.init();
2104.};
2105.
2106.
2107./**
2108. * Horizon config.
2109. * @enum {number}
2110. */
2111.Horizon.config = {
2112. BG_CLOUD_SPEED: 0.2,
2113. BUMPY_THRESHOLD: .3,
2114. CLOUD_FREQUENCY: .5,
2115. HORIZON_HEIGHT: 16,
2116. MAX_CLOUDS: 6
2117.};
2118.
2119.
2120.Horizon.prototype = {
2121. /**
2122. * Initialise the horizon. Just add the line and a cloud. No obstacles.
2123. */
2124. init: function() {
2125. this.addCloud();
2126. this.horizonLine = new HorizonLine(this.canvas, this.horizonImg);
2127. },
2128.
2129. /**
2130. * @param {number} deltaTime
2131. * @param {number} currentSpeed
2132. * @param {boolean} updateObstacles Used as an override to prevent
2133. * the obstacles from being updated / added. This happens in the
2134. * ease in section.
2135. */
2136. update: function(deltaTime, currentSpeed, updateObstacles) {
2137. this.runningTime += deltaTime;
2138. this.horizonLine.update(deltaTime, currentSpeed);
2139. this.updateClouds(deltaTime, currentSpeed);
2140.
2141. if (updateObstacles) {
2142. this.updateObstacles(deltaTime, currentSpeed);
2143. }
2144. },
2145.
2146. /**
2147. * Update the cloud positions.
2148. * @param {number} deltaTime
2149. * @param {number} currentSpeed
2150. */
2151. updateClouds: function(deltaTime, speed) {
2152. var cloudSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
2153. var numClouds = this.clouds.length;
2154.
2155. if (numClouds) {
2156. for (var i = numClouds - 1; i >= 0; i--) {
2157. this.clouds.update(cloudSpeed);
2158. }
2159.
2160. var lastCloud = this.clouds[numClouds - 1];
2161.
2162. // Check for adding a new cloud.
2163. if (numClouds < this.config.MAX_CLOUDS &&
2164. (this.dimensions.WIDTH - lastCloud.xPos) > lastCloud.cloudGap &&
2165. this.cloudFrequency > Math.random()) {
2166. this.addCloud();
2167. }
2168.
2169. // Remove expired clouds.
2170. this.clouds = this.clouds.filter(function(obj) {
2171. return !obj.remove;
2172. });
2173. }
2174. },
2175.
2176. /**
2177. * Update the obstacle positions.
2178. * @param {number} deltaTime
2179. * @param {number} currentSpeed
2180. */
2181. updateObstacles: function(deltaTime, currentSpeed) {
2182. // Obstacles, move to Horizon layer.
2183. var updatedObstacles = this.obstacles.slice(0);
2184.
2185. for (var i = 0; i < this.obstacles.length; i++) {
2186. var obstacle = this.obstacles;
2187. obstacle.update(deltaTime, currentSpeed);
2188.
2189. // Clean up existing obstacles.
2190. if (obstacle.remove) {
2191. updatedObstacles.shift();
2192. }
2193. }
2194. this.obstacles = updatedObstacles;
2195.
2196. if (this.obstacles.length > 0) {
2197. var lastObstacle = this.obstacles[this.obstacles.length - 1];
2198.
2199. if (lastObstacle && !lastObstacle.followingObstacleCreated &&
2200. lastObstacle.isVisible() &&
2201. (lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <
2202. this.dimensions.WIDTH) {
2203. this.addNewObstacle(currentSpeed);
2204. lastObstacle.followingObstacleCreated = true;
2205. }
2206. } else {
2207. // Create new obstacles.
2208. this.addNewObstacle(currentSpeed);
2209. }
2210. },
2211.
2212. /**
2213. * Add a new obstacle.
2214. * @param {number} currentSpeed
2215. */
2216. addNewObstacle: function(currentSpeed) {
2217. var obstacleTypeIndex =
2218. getRandomNum(0, Obstacle.types.length - 1);
2219. var obstacleType = Obstacle.types[obstacleTypeIndex];
2220. var obstacleImg = this.obstacleImgs[obstacleType.type];
2221.
2222. this.obstacles.push(new Obstacle(this.canvasCtx, obstacleType,
2223. obstacleImg, this.dimensions, this.gapCoefficient, currentSpeed));
2224. },
2225.
2226. /**
2227. * Reset the horizon layer.
2228. * Remove existing obstacles and reposition the horizon line.
2229. */
2230. reset: function() {
2231. this.obstacles = [];
2232. this.horizonLine.reset();
2233. },
2234.
2235. /**
2236. * Update the canvas width and scaling.
2237. * @param {number} width Canvas width.
2238. * @param {number} height Canvas height.
2239. */
2240. resize: function(width, height) {
2241. this.canvas.width = width;
2242. this.canvas.height = height;
2243. },
2244.
2245. /**
2246. * Add a new cloud to the horizon.
2247. */
2248. addCloud: function() {
2249. this.clouds.push(new Cloud(this.canvas, this.cloudImg,
2250. this.dimensions.WIDTH));
2251. }
2252.};
2253.})();