fixed up Canvas type bug. The Canvas constructor can now also take an optional isBuffer param. If not defined, default value is scene

src/Layer.js

@@ -39,9 +39,7 @@ Kinetic.Layer.prototype = {
         this.afterDrawFunc = undefined;
         this.canvas = new Kinetic.Canvas();
         this.canvas.getElement().style.position = 'absolute';
-        this.canvas.getContext().type = 'scene';
-        this.bufferCanvas = new Kinetic.Canvas();
-        this.bufferCanvas.getContext().type = 'buffer'; 
+        this.bufferCanvas = new Kinetic.Canvas(0, 0, true);
 
         // call super constructor
         Kinetic.Container.call(this, config);

src/Node.js

@@ -732,7 +732,7 @@ Kinetic.Node.prototype = {
             canvas = new Kinetic.Canvas(config.width, config.height);
         }
         else {
-            canvas = this.getStage().bufferCanvas;
+            canvas = this.getStage().canvas;
             canvas.clear();
         }
 

src/Stage.js

@@ -563,9 +563,7 @@ Kinetic.Stage.prototype = {
         this.attrs.container.appendChild(this.content);
 
         this.canvas = new Kinetic.Canvas();
-        this.canvas.getContext().type = 'scene';
-        this.bufferCanvas = new Kinetic.Canvas();
-        this.bufferCanvas.getContext().type = 'buffer';
+        this.bufferCanvas = new Kinetic.Canvas(0, 0, true);
 
         this._resizeDOM();
     },

src/util/Canvas.js

@@ -4,13 +4,16 @@
  * @param {Number} width
  * @param {Number} height
  */
-Kinetic.Canvas = function(width, height) {
+Kinetic.Canvas = function(width, height, isBuffer) {
     this.element = document.createElement('canvas');
     this.context = this.element.getContext('2d');
 
     // set dimensions
     this.element.width = width || 0;
     this.element.height = height || 0;
+
+    // set type
+    this.context.type = isBuffer ? 'buffer' : 'scene';
 };
 
 Kinetic.Canvas.prototype = {