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这篇CFSDN的博客文章Java实力弹弹球实现代码由作者收集整理,如果你对这篇文章有兴趣,记得点赞哟.
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
;
}
}
}
|
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原文链接:http://blog.csdn.net/qq_26525215/article/details/50382946 。
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