Define colorAt at declaration.

Author: octalmage

index.js

@@ -12,13 +12,13 @@ function bitmap(width, height, byteWidth, bitsPerPixel, bytesPerPixel, image)
     this.bitsPerPixel = bitsPerPixel;
     this.bytesPerPixel = bytesPerPixel;
     this.image = image;
+    
+    this.colorAt = function(x, y)
+    {
+        return robotjs.getColor(this, x, y);
+    };
 }
 
-bitmap.prototype.colorAt = function(x, y)
-{
-    return robotjs.getColor(this, x, y);
-};
-
 module.exports.screen.capture = function(x, y, width, height)
 {
     //If coords have been passed, use them.