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即时通讯相当新的Java和我很困惑如何做到这一点。我有一个听取WASD的关键听众,它指示我的Snake的移动。关键听众改变了我的蛇段的x和y位置。我有一个计时器链接到名为“Listener”的监听器,该监听器将移动重新绘制到缓冲区和屏幕上。我的问题是,为什么我的关键听众指示的移动不会将其放到缓冲区中?另外,我知道我的移动功能工作原因是snek.move(4);在计时器中工作。最后说明,这是一个我几乎没有开始的Snake游戏。聆听者和定时器之间的通信
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class SnekePanel extends JPanel
{
private static final int FRAME1 = 1000;
private static final int FRAME2 = 1000;
private static final Color BACKGROUND = new Color(0, 0, 0);
private BufferedImage myImage;
private Graphics myBuffer;
private Sneke snek;
private Food food;
private Timer t;
private int points = 0;
public SnekePanel()
{
myImage = new BufferedImage(FRAME1, FRAME2, BufferedImage.TYPE_INT_RGB);
myBuffer = myImage.getGraphics();
myBuffer.setColor(BACKGROUND);
myBuffer.fillRect(0, 0, FRAME1,FRAME2);
int xPos = (int)(Math.random()*(FRAME1-100) + 50);
int yPos = (int)(Math.random()*(FRAME2-100)+ 50);
food = new Food(xPos, yPos, 10, Color.RED);
snek = new Sneke(200,200,1,Color.WHITE);
t = new Timer(5, new Listener());
t.start();
addKeyListener(new Key());
setFocusable(true);
}
public void paintComponent(Graphics g)
{
g.drawImage(myImage, 0, 0, getWidth(), getHeight(), null);
}
private class Key extends KeyAdapter
{
public void keyPressed(KeyEvent e)
{
if(e.getKeyCode() == KeyEvent.VK_W)
{
snek.move(1);
}
if(e.getKeyCode() == KeyEvent.VK_A)
{
snek.move(2);
}
if(e.getKeyCode() == KeyEvent.VK_S)
{
snek.move(3);
}
if(e.getKeyCode() == KeyEvent.VK_D)
{
snek.move(4);
}
}
}
private class Listener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(snek.checkBlock() != 0)
{
myBuffer.setColor(BACKGROUND);
myBuffer.fillRect(0,0,FRAME1,FRAME2);
snek.move(4);
collide(snek, food);
food.draw(myBuffer);
snek.draw(myBuffer);
myBuffer.setColor(Color.BLACK);
repaint();
}
}
}
private void collide(Sneke b, Food pd)
{
int sx = b.getX(snek.getLength()-1);
int sy = b.getY(snek.getLength()-1);
int fx = pd.getX();
int fy = pd.getY();
if(sx == sy && fx == fy)
{
snek.setLength(snek.getLength()+1);
}
}
}
很好,因为关键监听改变蛇的领域,然后蛇在计时器重新绘制,我希望计时器反映关键听众的I/O。 –
@SompTingWong:好吧,因为你的计时器改变了字段,所以你需要调整你的期望。也许你不应该在定时器中设置蛇的状态。 –
@SompTingWong:查看使用密钥绑定的示例请 –