public void pop(){
  state=(GraphicsState)stack.pop();
  setTransform(state.xform);
  setClip(state.cliprgn);
}

public void pop ( ) { state = ( GraphicsState ) stack . pop ( ) ; setTransform ( state . xform ) ; setClip ( state . cliprgn ) ; }
restore the state of this object to what it was when the previous push ( ) was called .
