shapes.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. 12.22: Shapes.java
// Demonstrating some Java2D shapes.
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;

public class Shapes extends JFrame {

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

      setSize( 425, 160 );
      setVisible( true );
   }

   // draw shapes with Java2D API
   public void paint( Graphics g )
   {
      super.paint( g );  // call superclass's paint method

      Graphics2D g2d = ( Graphics2D ) g;  // cast g to Graphics2D

      // draw 2D ellipse filled with a blue-yellow gradient
      g2d.setPaint( new GradientPaint( 5, 30, Color.BLUE, 35, 100, 
         Color.YELLOW, true ) );  
      g2d.fill( new Ellipse2D.Double( 5, 30, 65, 100 ) );

      // draw 2D rectangle in red
      g2d.setPaint( Color.RED );                  
      g2d.setStroke( new BasicStroke( 10.0f ) ); 
      g2d.draw( new Rectangle2D.Double( 80, 30, 65, 100 ) );

      // draw 2D rounded rectangle with a buffered background
      BufferedImage buffImage = new BufferedImage( 10, 10, 
         BufferedImage.TYPE_INT_RGB );

      Graphics2D gg = buffImage.createGraphics();   
      gg.setColor( Color.YELLOW ); // draw in yellow
      gg.fillRect( 0, 0, 10, 10 ); // draw a filled rectangle
      gg.setColor( Color.BLACK );  // draw in black
      gg.drawRect( 1, 1, 6, 6 );   // draw a rectangle
      gg.setColor( Color.BLUE );   // draw in blue
      gg.fillRect( 1, 1, 3, 3 );   // draw a filled rectangle
      gg.setColor( Color.RED );    // draw in red
      gg.fillRect( 4, 4, 3, 3 );   // draw a filled rectangle

      // paint buffImage onto the JFrame
      g2d.setPaint( new TexturePaint( buffImage, 
         new Rectangle( 10, 10 ) ) );
      g2d.fill( new RoundRectangle2D.Double( 155, 30, 75, 100, 50, 50 ) );

      // draw 2D pie-shaped arc in white
      g2d.setPaint( Color.WHITE );
      g2d.setStroke( new BasicStroke( 6.0f ) ); 
      g2d.draw( new Arc2D.Double( 240, 30, 75, 100, 0, 270, Arc2D.PIE ) );

      // draw 2D lines in green and yellow
      g2d.setPaint( Color.GREEN );
      g2d.draw( new Line2D.Double( 395, 30, 320, 150 ) );

      float dashes[] = { 10 };

      g2d.setPaint( Color.YELLOW );    
      g2d.setStroke( new BasicStroke( 4, BasicStroke.CAP_ROUND,
         BasicStroke.JOIN_ROUND, 10, dashes, 0 ) ); 
      g2d.draw( new Line2D.Double( 320, 30, 395, 150 ) );

   } // end method paint

   // execute application
   public static void main( String args[] )
   {
      Shapes application = new Shapes();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

} // end class Shapes