tomshen

var RenderObject = function(rend, drawingContext){
    var currentCtx = (drawingContext !== undefined) ? drawingContext : ctx;

    if ( (rend.visible == undefined) ? true : rend.visible){
      currentCtx.save();
      if (rend.x != undefined && rend.y != undefined)
        currentCtx.translate(rend.x, rend.y);
      else if (rend.loc != undefined)
        currentCtx.translate(rend.loc.getX(), rend.loc.getY());