1 files changed, 125 insertions, 0 deletions
diff --git a/static/tests/canvas1/jsplatformer5_files/GameObjectManager.js b/static/tests/canvas1/jsplatformer5_files/GameObjectManager.js
new file mode 100644
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+++ b/static/tests/canvas1/jsplatformer5_files/GameObjectManager.js
@@ -0,0 +1,125 @@
+/**
+    A manager for all the objects in the game
+    @author <a href="mailto:matthewcasperson@gmail.com">Matthew Casperson</a>
+    @class
+*/
+function GameObjectManager()
+{
+    /** An array of game objects 
+        @type Arary
+    */
+    this.gameObjects = new Array();
+    /** The time that the last frame was rendered  
+        @type Date
+    */
+    this.lastFrame = new Date().getTime();
+    /** The global scrolling value of the x axis  
+        @type Number
+    */
+    this.xScroll = 0;
+    /** The global scrolling value of the y axis  
+        @type Number
+    */
+    this.yScroll = 0;
+    /** A reference to the ApplicationManager instance  
+        @type ApplicationManager
+    */
+    this.applicationManager = null;
+    /** A reference to the canvas element  
+        @type HTMLCanvasElement
+    */
+    this.canvas = null;
+    /** A reference to the 2D context of the canvas element
+        @type CanvasRenderingContext2D
+    */
+    this.context2D = null;
+    /** A reference to the in-memory canvas used as a back buffer 
+        @type HTMLCanvasElement
+    */
+    this.backBuffer = null;
+    /** A reference to the backbuffer 2D context 
+        @type CanvasRenderingContext2D
+    */
+    this.backBufferContext2D = null;
+
+    /**
+        Initialises this object
+        @return A reference to the initialised object
+    */
+    this.startupGameObjectManager = function()
+    {
+        // set the global pointer to reference this object
+        g_GameObjectManager = this;
+        
+        // get references to the canvas elements and their 2D contexts
+        this.canvas = document.getElementById('canvas');
+        this.context2D = this.canvas.getContext('2d');
+        this.backBuffer = document.createElement('canvas');
+        this.backBuffer.width = this.canvas.width;
+        this.backBuffer.height = this.canvas.height;
+        this.backBufferContext2D = this.backBuffer.getContext('2d');
+        
+        // create a new ApplicationManager
+        this.applicationManager = new ApplicationManager().startupApplicationManager();
+        
+        // use setInterval to call the draw function 
+        setInterval(function(){g_GameObjectManager.draw();}, SECONDS_BETWEEN_FRAMES);
+        
+        return this;        
+    }
+    
+    /**
+        The render loop
+    */
+    this.draw = function ()
+    {
+        // calculate the time since the last frame
+        var thisFrame = new Date().getTime();
+        var dt = (thisFrame - this.lastFrame)/1000;
+        this.lastFrame = thisFrame;
+        
+        // clear the drawing contexts
+        this.backBufferContext2D.clearRect(0, 0, this.backBuffer.width, this.backBuffer.height);
+        this.context2D.clearRect(0, 0, this.canvas.width, this.canvas.height);
+        
+        // first update all the game objects
+        for (x in this.gameObjects)
+        {
+            if (this.gameObjects[x].update)
+            {
+                this.gameObjects[x].update(dt, this.backBufferContext2D, this.xScroll, this.yScroll);
+            }
+        }
+
+        // then draw the game objects
+        for (x in this.gameObjects)
+        {
+            if (this.gameObjects[x].draw)
+            {
+                this.gameObjects[x].draw(dt, this.backBufferContext2D, this.xScroll, this.yScroll);
+            }
+        }
+        
+        // copy the back buffer to the displayed canvas
+        this.context2D.drawImage(this.backBuffer, 0, 0);
+    };
+    
+    /**
+        Adds a new GameObject to the gameObjects collection
+        @param gameObject The object to add
+    */
+    this.addGameObject = function(gameObject)
+    {
+        this.gameObjects.push(gameObject);
+        this.gameObjects.sort(function(a,b){return a.zOrder - b.zOrder;})
+    };
+    
+    /**
+        Removes a GameObject from the gameObjects collection
+        @param gameObject The object to remove
+    */
+    this.removeGameObject = function(gameObject)
+    {
+        this.gameObjects.removeObject(gameObject);
+    }
+}