(根据尚学堂课程学习制作,侵删)
1.桌球横向移动
import java.awt.*;
import javax.swing.*;
public class BallGame extends JFrame {
Image ball=Toolkit.getDefaultToolkit().getImage("images/ball.png");
Image desk=Toolkit.getDefaultToolkit().getImage("images/desk.jpg");
double x = 100; //小球的横坐标
double y = 100; //小球的纵坐标
boolean right = true; //方向
//画窗口的方法
public void paint(Graphics g){
System.out.println("窗口被画了一次");
g.drawImage(desk,0,0,null);
g.drawImage(ball,(int)x,(int)y,null);
if(right){
x=x+10;
}else{
x=x-10;
}
if(x>856-40-30){ //856是窗口宽度,40是桌子边框宽度,30是小球直径
right=false;
}
if(x<40){ //40是桌子边框宽度
right=true;
}
}
//窗口加载
void launchFrame(){
setSize(856,500);
setLocation(50,50);
setVisible(true);
//重画窗口
while(true){
repaint();
try{
Thread.sleep(40); //40ms
}catch(Exception e){
e.printStackTrace();
}
}
}
//main方法是程序执行的入口
public static void main(String[] args){
BallGame game = new BallGame();
game.launchFrame();
}
}
2.桌球自由移动
import java.awt.*;
import javax.swing.*;
public class BallGame2 extends JFrame {
Image ball=Toolkit.getDefaultToolkit().getImage("images/ball.png");
Image desk=Toolkit.getDefaultToolkit().getImage("images/desk.jpg");
double x = 100; //小球的横坐标
double y = 100; //小球的纵坐标
double degree = 3.14/3; //弧度,此处就是60度。
//画窗口的方法
public void paint(Graphics g){
System.out.println("窗口被画了一次");
g.drawImage(desk,0,0,null);
g.drawImage(ball,(int)x,(int)y,null);
x = x+10*Math.cos(degree);
y = y+10*Math.sin(degree);
if(y>500-40-40 || y<40+40){ //500是窗口高度,40是桌子边框,30是球的直径,最后一个40是标题栏的高度
degree = -degree;
}
//碰到左右边界
if(x<40 || x>856-40-30){
degree = 3.14-degree;
}
}
//窗口加载
void launchFrame(){
setSize(856,500);
setLocation(50,50);
setVisible(true);
//重画窗口
while(true){
repaint();
try{
Thread.sleep(40); //40ms
}catch(Exception e){
e.printStackTrace();
}
}
}
//main方法是程序执行的入口
public static void main(String[] args){
BallGame2 game = new BallGame2();
game.launchFrame();
}
}