Question

我一直试图解决这个问题几个小时了，我似乎无法弄明白。我的最终目标是拥有一个内部有移动球的JFrame。我遇到的问题是当我的精灵移动时，留下一条痕迹。这是一个image of what the JFrame looks like。请原谅我对GUI组件的极其有限的了解，因为这是我第一次使用它们。这是我的课程。非常感谢任何帮助，因为我真的很困惑。

公共类TenBall {

private int XPos;
private int YPos;
Image theBall = Toolkit.getDefaultToolkit().getImage("src//ball2.jpeg");

public TenBall(int x,int y) {
    YPos = y;
    XPos = x;
}

public int getXPos(){
    return XPos;
}

public int getYPos() {  
    return YPos;
}
//400,500
public void move() {//this method moves the ball and doesn't let it touch the sides of the JFrame
    XPos++;

    if(XPos >= 390) {
        XPos --;
    }

    if(XPos <= 10) {
        XPos++;
    }
    if(YPos >=490) {
        YPos--;
    }
    if(YPos <=10) {
        YPos++;
    } 

}

public void draw(Graphics g) { //this is the paint method called in gameWindow

    g.drawImage(theBall, (int)XPos, (int)YPos, null);
}



import java.awt.*;

公共类GameAnimation扩展了线程{

private TenBall MyBall;
private gameWindow theWindow;

public GameAnimation(TenBall b, gameWindow win) {
    MyBall  = b;
    theWindow=win;
}

public void run() {
    int t=0;
    while(t<1000) {
        MyBall.move();
        theWindow.repaint();

        try{
            Thread.sleep(2);
        }
        catch (InterruptedException ex)
        {

        }

    }

}

}

现在是GameWindow类

import java.awt.*;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class gameWindow extends JFrame{
public TenBall ATB;

public gameWindow() {
this.setVisible(true);
this.setTitle("Chase the Ball Game");
this.setSize(400,500);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = this.getContentPane();
c.setBackground(Color.red);

ATB = new TenBall(50,50);
JPanel myPanel=new JPanel();
this.getContentPane().add(myPanel);
startGame();
}










public void paint(Graphics g){
    ATB.draw(g);
}
public void startGame() {
    GameAnimation Thread1 = new GameAnimation(ATB, this);
        Thread1.start();
        ATB.move();
}

public static void main(String[] args) {
    new gameWindow();
}

}

在JFrame上移动精灵时，会留下一条踪迹

0 个答案: