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override public function transformWorldToScene(inPos:Point):Point {
   var px:int = inPos.x * mapBlockGapX;
   var py:int = Math.floor(inPos.y / 2) * mapBlockGapY;
   // stagger if row is even
   if (inPos.y % 2 == 0) {
    px -= mapBlockStaggerX;
    py -= mapBlockStaggerY;
   }
   return new Point(px, py);
  }