myframe.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.

package arrow;

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.KeyEvent;

public class MyFrame extends Frame{
    private Ball ball;
    public static final int STEP = 3;
    public MyFrame(){
        super();
        ball = new Ball();
        ball.setX(150);
        ball.setY(130);
        ball.setR(10);
        this.addKeyListener(new ArrowDecoratorListener(new ArrowKeyListener(){

            public void leftArrowPressed(KeyEvent event) {
                ball.setX(ball.getX()-STEP);
                repaint();
            }

            public void rightArrowPressed(KeyEvent event) {
                ball.setX(ball.getX()+STEP);
                repaint();
            }

            public void upArrowPressed(KeyEvent event) {
                ball.setY(ball.getY()-STEP);
                repaint();
            }

            public void downArrowPressed(KeyEvent event) {
                ball.setY(ball.getY()+STEP);
                repaint();
            }

            public void upLeftArrowPressed(KeyEvent event) {
                ball.setX(ball.getX()-STEP);
                ball.setY(ball.getY()-STEP);
                repaint();
            }

            public void upRightArrowPressed(KeyEvent event) {
                ball.setX(ball.getX()+STEP);
                ball.setY(ball.getY()-STEP);
                repaint();
            }

            public void downLeftArrowPressed(KeyEvent event) {
                ball.setX(ball.getX()-STEP);
                ball.setY(ball.getY()+STEP);
                repaint();
            }

            public void downRightArrowPressed(KeyEvent event) {
                ball.setX(ball.getX()+STEP);
                ball.setY(ball.getY()+STEP);
                repaint();
            }
        }));
        
    }
    @Override
    public void paint(Graphics g){
        super.paint(g);
        ball.paintMySelf(g);
    }
    
    public static void main(String[] args) {
        MyFrame f = new MyFrame();
        f.setSize(300,260);
        f.setVisible(true);
    }


}