rocketpanel.java

Java 程序设计教程（第五版）EXAMPLESchap07源码

//********************************************************************
//  RocketPanel.java       Author: Lewis/Loftus
//
//  Demonstrates the use of polygons and polylines.
//********************************************************************

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

public class RocketPanel extends JPanel
{
   private int[] xRocket = {100, 120, 120, 130, 130, 70, 70, 80, 80};
   private int[] yRocket = {15, 40, 115, 125, 150, 150, 125, 115, 40};

   private int[] xWindow = {95, 105, 110, 90};
   private int[] yWindow = {45, 45, 70, 70};

   private int[] xFlame = {70, 70, 75, 80, 90, 100, 110, 115, 120,
                           130, 130};
   private int[] yFlame = {155, 170, 165, 190, 170, 175, 160, 185,
                           160, 175, 155};

   //-----------------------------------------------------------------
   //  Constructor: Sets up the basic characteristics of this panel.
   //-----------------------------------------------------------------
   public RocketPanel()
   {
      setBackground (Color.black);
      setPreferredSize (new Dimension(200, 200));
   }

   //-----------------------------------------------------------------
   //  Draws a rocket using polygons and polylines.
   //-----------------------------------------------------------------
   public void paintComponent (Graphics page)
   {
      super.paintComponent (page);

      page.setColor (Color.cyan);
      page.fillPolygon (xRocket, yRocket, xRocket.length);

      page.setColor (Color.gray);
      page.fillPolygon (xWindow, yWindow, xWindow.length);

      page.setColor (Color.red);
      page.drawPolyline (xFlame, yFlame, xFlame.length);
   }
}