overlay.java

java 图形处理

//package paint2d;

import java.awt.*;
import java.awt.geom.*;

/** A Overlay is a Picture that consists of
    one picture on top of another.
*/ 

public class Overlay extends Picture {

   private Picture over, under;

   /** Create Picture consisting of picture p1
       overlying picture p2.
   */
   public Overlay(Picture p1, Picture p2) {
      over = p1;
      under = p2;
   }

   /** Apply transformation t to this Overlay picture,
       and display it using graphics g2.
   */
   public void transDisplay
      (AffineTransform t, Graphics2D g2) {
      under.transDisplay(t,g2);
      over.transDisplay(t,g2);
   }
}