drawpolygon.java

本书结合作者丰富的实践经验和深厚的理论基础

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 public class DrawPolygon extends JFrame {
   public DrawPolygon (){
     super( " Draw  Polygon " );
     setSize( 280, 235 );
     setVisible( true );
   }
   public void paint( Graphics g ){
      super.paint(g);
      int xValues[] = { 10, 20, 50, 30, 20, 15 };
      int yValues[] = { 50, 50, 60, 80, 80, 60 };
      Polygon polygon1 = new Polygon( xValues, yValues, 6 );
      g.drawPolygon( polygon1 );
      int xValues2[] = { 70, 90, 100, 80, 70, 65, 60 };
      int yValues2[] = { 80, 100, 110, 140, 130, 110, 90 };
      g.drawPolyline( xValues2, yValues2, 7 );
      int xValues3[] = { 120, 130, 150, 190 };
      int yValues3[] = { 40, 70, 80, 60 };
      g.fillPolygon( xValues3, yValues3, 4 );
      Polygon polygon2 = new Polygon();
      polygon2.addPoint( 165, 135 );
      polygon2.addPoint( 175, 150 );
      polygon2.addPoint( 270, 200 );
      polygon2.addPoint( 200, 220 );
      polygon2.addPoint( 130, 180 );
      g.fillPolygon( polygon2 );
 }
  public static void main( String args[] ){
    DrawPolygon app = new DrawPolygon ();
    appDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
  }
}