[英]How to move object left, right, up and down using KeyListener does not seem to be working
[英]Java - How to move object up and down using KeyListener?
我正在制作一个程序,用户可以使用键盘上的箭头键在迷宫中移动。 我能够让机器人对象从左向右移动就好了; 但我不能为向上或向下移动做同样的事情。 当我试图将它朝这些方向移动时,我完全不理解的事情没有发生。 我究竟做错了什么? 这是代码:
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class Droid2 extends JPanel
{
int x=10, y=200;
ImageIcon icon = new ImageIcon("robot.jpg");
public Droid2()
{
addKeyListener (new DotsListener());
setFocusable(true);
setPreferredSize(new Dimension(850, 600));
}
public void paintComponent(Graphics page)
{
super.paintComponent(page);
File input = new File("maze.png");
Image img = new ImageIcon("maze.png").getImage();
Image img2 = new ImageIcon("robot.png").getImage();
BufferedImage bufferedImage;
try {
bufferedImage = ImageIO.read(input);
Color c=new Color(bufferedImage.getRGB(x, y));// & 255;int d=(bufferedImage.getRGB(x, y)<<16)&0xFF;
System.out.println("Red:"+c.getRed()+",\t Green:"+c.getGreen()+",\t Blue:"+c.getBlue());
if(c.getBlue()<255)
y-=10;
} catch (IOException e) {
e.printStackTrace();
}
page.drawImage(img, 0, 0, null);
page.drawImage(img2, x, 260, null);
System.out.println();
}
private class DotsListener implements KeyListener
{
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_RIGHT)
x+=10;
else if(e.getKeyCode()==KeyEvent.VK_DOWN)
y+=10;
else if(e.getKeyCode() ==KeyEvent.VK_LEFT)
x-=10;
else if(e.getKeyCode() ==KeyEvent.VK_UP)
y-=10;
repaint();
}
@Override
public void keyReleased(KeyEvent e) {
}
}
}
`
可能是因为您没有使用y
变量来绘制图像,而是使用了硬编码260
。
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