shapes2.java

一个Java图形程序

// Fig. 11.23: Shapes2.java
// Demonstrating a general path

// Java core packages
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;

// Java extension packages
import javax.swing.*;

public class Shapes2 extends JFrame {

   // set window's title bar String, background color
   // and dimensions
   public Shapes2()
   {
      super( "Drawing 2D Shapes" );

      getContentPane().setBackground( Color.yellow );
      setSize( 400, 400 );
      show();
   }

   // draw general paths
   public void paint( Graphics g )
   {
      // call superclass's paint method
      super.paint( g );

      int xPoints[] = 
         { 55, 67, 109, 73, 83, 55, 27, 37, 1, 43 };
      int yPoints[] = 
         { 0, 36, 36, 54, 96, 72, 96, 54, 36, 36 };

      Graphics2D g2d = ( Graphics2D ) g;

      // create a star from a series of points
      GeneralPath star = new GeneralPath();

      // set the initial coordinate of the General Path
      star.moveTo( xPoints[ 0 ], yPoints[ 0 ] );

      // create the star--this does not draw the star
      for ( int count = 1; count < xPoints.length; count++ )
         star.lineTo( xPoints[ count ], yPoints[ count ] );

      // close the shape
      star.closePath();

      // translate the origin to (200, 200)
      g2d.translate( 200, 200 );

      // rotate around origin and draw stars in random colors
      for ( int count = 1; count <= 20; count++ ) {

         // rotate coordinate system
         g2d.rotate( Math.PI / 10.0 );

         // set random draw ing color
         g2d.setColor( new Color( 
            ( int ) ( Math.random() * 256 ),
            ( int ) ( Math.random() * 256 ),              
            ( int ) ( Math.random() * 256 ) ) );

         // draw filled star
         g2d.fill( star );   
      }

   }  // end method paint
 
   // execute application
   public static void main( String args[] )
   {
      Shapes2 application = new Shapes2();

      application.setDefaultCloseOperation(
         JFrame.EXIT_ON_CLOSE );
   }
  
}  // end class Shapes2

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 * (C) Copyright 2002 by Deitel & Associates, Inc. and Prentice Hall.     *
 * All Rights Reserved.                                                   *
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