shapes2.java

java 课件与资料 java 课件与资料 java 课件与资料 java 课件与资料

// Fig. 12.23: Shapes2.java
// Demonstrating a general path.
import java.awt.*;
import java.awt.geom.*;
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.WHITE );
      setSize( 400, 400 );
      setVisible( true );
   }

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

      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;
      GeneralPath star = new GeneralPath();  // create GeneralPath object

      // 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 ] );

      star.closePath();  // close the shape

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

      // rotate around origin and draw stars in random colors
      for ( int count = 1; count <= 20; count++ ) {
         g2d.rotate( Math.PI / 10.0 );  // rotate coordinate system

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

         g2d.fill( star );  // draw filled 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