demowindowframe.java

java绘图 java awt 经典绘图的例子,对于初学awt模块的人非常有帮助.

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package swing;

import java.awt.AWTException;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JWindow;

/**
 *
 * @author zhaolin
 */
public class DemoWindowFrame extends JWindow {
    private Robot r;
    private BufferedImage image;
    private Rectangle rect;
    public DemoWindowFrame(){
        try {
            r = new Robot();
        } catch (AWTException ex) {
            Logger.getLogger(DemoWindowFrame.class.getName()).log(Level.SEVERE, null, ex);
        }
        rect = new Rectangle();
        rect.x = 0;
        rect.y = 0;
        rect.width = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();
        rect.height = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();
        image = r.createScreenCapture(rect);
        this.addMouseMotionListener(new MouseMotionListener(){

            public void mouseDragged(MouseEvent e) {
                getGraphics().setColor(Color.red);
                getGraphics().fillRect(e.getX(), e.getY(), 5, 5);
            }

            public void mouseMoved(MouseEvent e) {
                //throw new UnsupportedOperationException("Not supported yet.");
            }
            
        });
        this.setSize(rect.width,rect.height);
        this.setVisible(true);
    }
            
    public void paint(Graphics g){
        super.paint(g);
        g.drawImage(image, 0, 0, this);
              
    }
    
     public static void main(String[] args) {
        new DemoWindowFrame();
    }

}