Added basic canvas game files

Author: GalaxiaGuy

canvasGame/Entity.js

@@ -0,0 +1,21 @@
+function Entity(game)
+{
+    this.game = game;
+    this.x = 0;
+    this.y = 0;
+}
+
+Entity.prototype.draw = function(ctx)
+{
+};
+
+Entity.prototype.update = function(elapsed)
+{
+};
+
+Entity.prototype.drawCentered = function(ctx, sprite, x, y)
+{
+    x -= sprite.width/2;
+    y -= sprite.height/2;
+    ctx.drawImage(sprite, x, y);
+};

canvasGame/Game.js

@@ -0,0 +1,34 @@
+function Game()
+{
+}
+
+Game.prototype.loop = function()
+{
+    this.draw(this.ctx);
+    this.update();
+};
+
+Game.prototype.init = function(canvas, imagePrefix)
+{
+    this.imageManager = new ImageManager(imagePrefix);
+    this.ctx = canvas.getContext('2d');
+};
+
+Game.prototype.draw = function(ctx)
+{
+};
+
+Game.prototype.update = function(elapsed)
+{
+    this.imageManager.update();
+};
+
+Game.prototype.start = function()
+{
+    var that = this;
+    (function gameLoop()
+    {
+        that.loop();
+        requestAnimFrame(gameLoop, that.ctx.canvas);
+    })();
+};

canvasGame/ImageManager.js

@@ -0,0 +1,37 @@
+function ImageManager(prefix)
+{
+    this.prefix = prefix;
+    this.successCount = 0;
+    this.errorCount = 0;
+    this.cache = {};
+    this.downloadQueue = [];
+}
+
+ImageManager.prototype.queueDownload = function(path)
+{
+    this.downloadQueue.push(path);
+    this.cache[path] = new Image();
+};
+
+ImageManager.prototype.isDone = function()
+{
+    return (this.downloadQueue.length == this.successCount + this.errorCount);
+};
+
+ImageManager.prototype.update = function()
+{
+    if (this.downloadQueue.length > 0)
+    {
+        var path = this.downloadQueue.pop();
+        this.cache[path].src = this.prefix+path;       
+    }
+};
+
+ImageManager.prototype.get = function(path)
+{
+    if (!this.cache[path])
+    {
+        this.queueDownload(path);
+    }
+    return this.cache[path];
+};