public void bindX(DoubleProperty xProperty){
  minXWorld.bind(xProperty.add(getMinX()));
  maxXWorld.bind(minXWorld.add(getWidth()));
}

public void bindX ( DoubleProperty xProperty ) { minXWorld . bind ( xProperty . add ( getMinX ( ) ) ) ; maxXWorld . bind ( minXWorld . add ( getWidth ( ) ) ) ; }
bind to x property of entity .
