Gamedev.tutsplus Introduction to Spritesheet Animation - multiple cycles

A demo of creating a spritesheet animation from a spritesheet with multiple cycles.

by Steven Lambert

HTML

<canvas id="canvas" width="150" height="150"></canvas>

CSS

canvas {
    border: 1px solid black;
}

JavaScript

/**
 * Copyright (C) 2013 Steven Lambert
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
 * OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * Full tutorial can be found on gamedev.tutsplus.com
 */

var ctx = document.getElementById('canvas').getContext('2d');

/**
 * Creates a Spritesheet to define our data.
 * @param {string} - Path to the image.
 * @param {number} - Width (in px) of each frame.
 * @param {number} - Height (in px) of each frame.
 */
function SpriteSheet(path, frameWidth, frameHeight) {
  this.image = new Image();
  this.frameWidth = frameWidth;
  this.frameHeight = frameHeight;

  // calculate the number of frames in a row after the image loads
  var self = this;
  this.image.onload = function() {
    self.framesPerRow = Math.floor(self.image.width / self.frameWidth);
  };

  this.image.src = path;
}

/**
 * Creates an animation from a spritesheet.
 * @param {SpriteSheet} - The spritesheet used to create the animation.
 * @param {number}      - Number of frames to wait for before transitioning the animation.
 * @param {array}       - Range or sequence of frame numbers for the animation.
 * @param {boolean}     -...