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我试图让一个简单的精灵在我的屏幕上移动。我无法弄清楚这段代码有什么问题，因为我遵循了来自不同源代码的说明，但删除了其他代码中其他功能添加的一些复杂性。现在我只是想让它在屏幕上自由移动。后来我打算让动画在移动时改变。这两个类的代码如下。

package game;

import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JPanel;
import javax.swing.Timer:

public class Game extends JPanel implements ActionListener {

int x, y, b_width, b_height;
Player player;
      Timer timer;

public Game() {
    addKeyListener(new KeyRecorder());
    player = new Player();

                timer = new Timer(5, this);
                timer.start();
}

public void paint(Graphics g){
    g.drawImage(player.image, player.getX(), player.getY(), this);
}

@Override
public void actionPerformed(ActionEvent e) {
    player.move();
    repaint();
}

public class KeyRecorder extends KeyAdapter{
    public void keyPressed(KeyEvent e){
        player.keyPressed(e);
        repaint();
    }
    public void keyReleased(KeyEvent e){
        player.keyReleased(e);
    }
}

}

和精灵：

package game;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;

import javax.swing.ImageIcon;

public class Player {

private String sprite = "sprite.png"; 
int x, y, dx, dy;
int width, height;
Image image;

public Player() {
    ImageIcon ii = new ImageIcon(this.getClass().getResource(sprite));
    image = ii.getImage();

}

public int getX(){
    return x;
}

public int getY(){
    return y;
}

public void move() {
    x = x + dx;
    y = y + dy;
}

public void keyPressed(KeyEvent e){
    int key = e.getKeyCode();

    if(key == KeyEvent.VK_UP){
        dy -= 3;
    }
    if(key == KeyEvent.VK_DOWN){
        dy += 3;
    }
    if(key == KeyEvent.VK_LEFT){
        dx -= 3;
    }
    if(key == KeyEvent.VK_RIGHT){
        dx += 3;
    }
}

public void keyReleased(KeyEvent e){
             int key = e.getKeyCode();

    if(key == KeyEvent.VK_UP){
        dy -= 0;
    }
    if(key == KeyEvent.VK_DOWN){
        dy += 0;
    }
    if(key == KeyEvent.VK_LEFT){
        dx -= 0;
    }
    if(key == KeyEvent.VK_RIGHT){
        dx += 0;
    }
}


}
4

2 回答 2

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自定义绘画是通过覆盖paintComponent() 方法而不是paint() 方法来完成的。

KeyEvent 仅由具有焦点的组件接收。看起来您的面板没有焦点。在构造函数中，您需要添加： 

setFocusable(true);
于 2013-02-18T16:10:23.263 回答
0

我对摇摆知之甚少，但是您是否为要绘制的每一帧调用“repaint()”？例如

thePanel.repaint();

如果它闪烁，您可能还需要将面板设置为双缓冲

setDoubleBuffered(true);

我希望这些对你有帮助。如果这不能回答您的问题，也许这将http://docs.oracle.com/javase/tutorial/uiswing/painting/我没有时间阅读它，但我确实浏览了它，它看起来不错。

于 2013-02-18T16:42:09.550 回答