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我一直在尝试使用箭头键移动JPanel
。它一直没有工作。我相信这是我的内心阶层延伸KeyAdapter
。我也不确定ActionListener
是如何实施的。我所做的其他课并不重要,因为它只是框架。使用KeyListener使用箭头键移动JPanel中的矩形
package jerryWorlds;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Jerry extends JPanel implements ActionListener{
int SizeX, SizeY, PosX, PosY, VelX, VelY;
Image img;
Timer time = new Timer(1, this);
public Jerry(){
ImageIcon i = new ImageIcon();
addKeyListener(new AL());
time.start();
img = i.getImage();
PosX = 375;
PosY = 250;
}
public void paint(Graphics g){
Graphics2D g2d = (Graphics2D)g;
g2d.fillRect(PosX, PosY, 50, 100);
}
public void actionPerformed(ActionEvent e) {
PosX = PosX + VelX;
repaint();
}
private class AL extends KeyAdapter{
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
System.out.println("YAY!");
if(key == KeyEvent.VK_LEFT)
VelX = -1;
else if(key == KeyEvent.VK_RIGHT)
VelX = 1;
}
public void keyReleased(KeyEvent e) {
int key = e.getKeyCode();
if(key == KeyEvent.VK_LEFT)
VelX = 0;
else if(key == KeyEvent.VK_RIGHT)
VelX = 0;
}
}
}
这篇由@camickr发表的文章,关于[Motion Using the Keyboard](http://tips4java.wordpress.com/2013/06/09/motion-using-the-keyboard/),肯定会为您的知识增加一些内容:-)。好像你的问题没有写在写作的意义上,看着你看到的代码,当你按下箭头键时你想画一个新的矩形,你真的不会移动你的标题中所述的'JPanel' ... –