Particle effects con candy deletion

code/GameLib.js

@@ -1,3 +1,21 @@
+var Vec2D = {
+  Scale: function(vecIn, scale) {
+    return {
+      X: vecIn.X * scale,
+      Y: vecIn.Y * scale
+    };
+  },
+  Normalize: function(vecIn){
+    var len = Math.sqrt(
+      (vecIn.X * vecIn.X) +
+      (vecIn.Y * vecIn.Y));
+    return {
+      X: vecIn.X / len, 
+      Y: vecIn.Y / len};
+  }
+};
+
+
 
 /////////////////////////////////////////
 //
@@ -164,6 +182,10 @@ GameEntity.prototype = {
 		this.PositionDest.X = position.X;
 		this.PositionDest.Y = position.Y;
 	},
+  AddPosition: function(delta) {
+    this.PositionDest.X = this.Position.X + delta.X;
+    this.PositionDest.Y = this.Position.Y + delta.Y;
+  },
 	Delete: function(){
 		this.Deleted = true;
 	},
@@ -176,6 +198,16 @@ GameEntity.prototype = {
 			true
 		);
 	},
+  InsideScreen: function(){
+    return (
+      (this.Position.X+(this.Size.X/2))>0 &&
+      (this.Position.Y+(this.Size.Y/2))>0 &&
+      (this.Position.X-(this.Size.X/2))
+        <this.GameScreen.Size.X &&
+      (this.Position.Y-(this.Size.Y/2))
+        <this.GameScreen.Size.Y
+    );
+  },
 	Debug: false
 };