先看看效果图:
直接上代码了。
微调按钮加画布画几个圆,再实现监听。。。
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package cn.hncu.threadDemo.thread2; import java.awt.Canvas; import java.awt.Color; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JSpinner; import javax.swing.Timer; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class BallsJFrame extends JFrame implements ChangeListener{ private BallsCanvas ball; private JSpinner spinner; public BallsJFrame(){ super ( "弹弹球" ); this .setBounds( 300 , 200 , 400 , 300 ); this .setDefaultCloseOperation(EXIT_ON_CLOSE); Color colors[] = {Color.red,Color.green,Color.blue,Color.magenta,Color.cyan}; ball = new BallsCanvas(colors, 100 ); this .getContentPane().add(ball); //默认是CENTER位置 JPanel panel = new JPanel(); this .getContentPane().add(panel, "South" ); panel.add( new JLabel( "Delay" )); spinner = new JSpinner(); spinner.setValue( 100 ); panel.add(spinner); spinner.addChangeListener( this ); this .setVisible( true ); } @Override public void stateChanged(ChangeEvent e) { int value = Integer.parseInt( "" +spinner.getValue()); ball.setDelay(value); } public static void main(String[] args) { new BallsJFrame(); } } class BallsCanvas extends Canvas implements ActionListener, FocusListener{ private Ball balls[]; //存放所有的球 private Timer timer; //javax.swing.Timer public BallsCanvas(Color colors[] , int delay){ this .balls = new Ball[colors.length]; for ( int i= 0 ,x= 40 ;i<colors.length;i++,x+= 20 ){ this .balls[i] = new Ball(x,x,colors[i]); } //让当前画布监听 焦点事件 this .addFocusListener( this ); timer = new Timer(delay, this ); timer.start(); } public void setDelay( int delay){ timer.setDelay(delay); } @Override public void paint(Graphics g) { for ( int i= 0 ;i< this .balls.length;i++){ g.setColor(balls[i].color); //让每个球的坐标变化一下---(x坐标) balls[i].x = balls[i].left ? balls[i].x- 10 :balls[i].x+ 10 ; //当球碰壁时,更改球的方向 if (balls[i].x<= 0 ||balls[i].x>= this .getWidth()- 24 ){ balls[i].left = !balls[i].left; //切换方向 } //让每个球的坐标变化一下---(y坐标) balls[i].y = balls[i].up ? balls[i].y- 10 :balls[i].y+ 10 ; //当球碰壁时,更改球的方向 if (balls[i].y<= 0 ||balls[i].y>= this .getHeight()- 22 ){ balls[i].up = !balls[i].up; //切换方向 } g.fillOval(balls[i].x, balls[i].y, 20 , 20 ); } } @Override public void actionPerformed(ActionEvent e) { //System.out.println("aaa"); repaint(); //刷新画布.调用paint(Graphics g) } @Override public void focusGained(FocusEvent e) { timer.stop(); } @Override public void focusLost(FocusEvent e) { timer.restart(); } private static class Ball{ int x,y; boolean up,left; Color color; public Ball( int x, int y, Color color) { this .x = x; this .y = y; this .color = color; up = left = false ; } } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/qq_26525215/article/details/50382946