Zoom initial implementation. No UI, only bound to mousewheel. Everything is broken, to amend !

js/utils/CanvasUtils.js

@@ -15,8 +15,23 @@
           canvas.classList.add(classList[i]);
         }
       }
-      
+
       return canvas;
+    },
+
+    disableImageSmoothing : function (canvas) {
+      var context = canvas.getContext('2d');
+      context.imageSmoothingEnabled = false;
+      context.mozImageSmoothingEnabled = false;
+      context.oImageSmoothingEnabled = false;
+      context.webkitImageSmoothingEnabled = false;
+      context.msImageSmoothingEnabled = false;
+    },
+
+    clear : function (canvas) {
+      if (canvas) {
+        canvas.getContext("2d").clearRect(0, 0, canvas.width, canvas.height);
+      }
     }
   };
 })();