java编程加载窗口，实现物体变速运动（台球的运动）

1.整体的结构图：



2.编写GameFrame03.java的代码：

package cn.bjsxt.test;

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class GameFrame03 extends Frame {

Image image = GameUtil.getImage("images/sun.jpg");

public void launchFrame() {
setSize(500, 500);
setLocation(100, 100);
setVisible(true);
new PaintThread().start();
addWindowListener(new WindowAdapter() {
// 单击右键选择“source”中的“override/implement
// methods”，frame里面勾选“windowClosed”点击“OK”
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}

private double x = 100, y = 100;
private double degree = 3.14 / 3;
private double speed = 13;

// 单击右键选择“source”中的“override/implement
// methods”，window里面勾选“paint(graphic)”点击“OK”
@Override
public void paint(Graphics g) {
g.drawImage(image, (int) x, (int) y, null);
if (speed > 0) {
speed -= 0.1;
} else {
speed = 0;
}
x += speed * Math.cos(degree);
y += speed * Math.sin(degree);
if (y > 500 - 130 || y < 30) {
degree = -degree;
}
if (x < 0 || x > 500 - 130) {
degree = Math.PI - degree;
}
}

class PaintThread extends Thread {
public void run() {
while (true) {
repaint();
try {
Thread.sleep(40);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}

public static void main(String[] args) {
GameFrame03 gf = new GameFrame03();
gf.launchFrame();
}

}


3.编写GameUtil.java的代码：
package cn.bjsxt.test;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;

public class GameUtil {

private GameUtil() {
}

public static Image getImage(String path) {
URL u = GameUtil.class.getClassLoader().getResource(path);
BufferedImage image = null;
try {
image = ImageIO.read(u);
} catch (IOException e) {
e.printStackTrace();
}
return image;
}

}


4.运行之后的结果：