Add Circle and Ellipse, and move hit tests into shapes

src/pixi/core/Ellipse.js

@@ -0,0 +1,81 @@
+/**
+ * @author Chad Engler <chad@pantherdev.com>
+ */
+
+/**
+ * @class Ellipse
+ * @constructor
+ * @param x {Number} The X coord of the upper-left corner of the framing rectangle of this circle
+ * @param y {Number} The Y coord of the upper-left corner of the framing rectangle of this circle
+ * @param width {Number} The overall height of this ellipse
+ * @param height {Number} The overall width of this ellipse
+ */
+PIXI.Ellipse = function(x, y, width, height)
+{
+    /**
+     * @property x
+     * @type Number
+     * @default 0
+     */
+    this.x = x || 0;
+    
+    /**
+     * @property y
+     * @type Number
+     * @default 0
+     */
+    this.y = y || 0;
+    
+    /**
+     * @property width
+     * @type Number
+     * @default 0
+     */
+    this.width = width || 0;
+    
+    /**
+     * @property height
+     * @type Number
+     * @default 0
+     */
+    this.height = height || 0;
+}
+
+/**
+ * @method clone
+ * @return a copy of the polygon
+ */
+PIXI.Ellipse.clone = function()
+{
+    return new PIXI.Ellipse(this.x, this.y, this.width, this.height);
+}
+
+/**
+ * @method contains
+ * @param x {Number} The X coord of the point to test
+ * @param y {Number} The Y coord of the point to test
+ * @return if the x/y coords are within this polygon
+ */
+PIXI.Ellipse.contains = function(x, y)
+{
+    if(this.width <= 0 || this.height <= 0)
+        return false;
+
+    //normalize the coords to an ellipse with center 0,0
+    //and a radius of 0.5
+    var normx = ((x - this.x) / this.width) - 0.5,
+        normy = ((y - this.y) / this.height) - 0.5;
+
+    normx *= normx;
+    normy *= normy;
+
+    return (normx + normy < 0.25);
+}
+
+PIXI.Ellipse.getBounds = function()
+{
+    return new PIXI.Rectangle(this.x, this.y, this.width, this.height);
+}
+
+PIXI.Ellipse.constructor = PIXI.Ellipse;
+