splatpanel.java

Java 程序设计教程（第五版）EXAMPLESchap04源码

//********************************************************************
//  SplatPanel.java       Author: Lewis/Loftus
//
//  Demonstrates the use of graphical objects.
//********************************************************************

import javax.swing.*;
import java.awt.*;

public class SplatPanel extends JPanel
{
   private Circle circle1, circle2, circle3, circle4, circle5;

   //-----------------------------------------------------------------
   //  Constructor: Creates five Circle objects.
   //-----------------------------------------------------------------
   public SplatPanel()
   {
      circle1 = new Circle (30, Color.red, 70, 35);
      circle2 = new Circle (50, Color.green, 30, 20);
      circle3 = new Circle (100, Color.cyan, 60, 85);
      circle4 = new Circle (45, Color.yellow, 170, 30);
      circle5 = new Circle (60, Color.blue, 200, 60);

      setPreferredSize (new Dimension(300, 200));
      setBackground (Color.black);
   }

   //-----------------------------------------------------------------
   //  Draws this panel by requesting that each circle draw itself.
   //-----------------------------------------------------------------
   public void paintComponent (Graphics page)
   {
      super.paintComponent(page);

      circle1.draw(page);
      circle2.draw(page);
      circle3.draw(page);
      circle4.draw(page);
      circle5.draw(page);
   }
}