Java 我无法绘制对象并让它们在屏幕上移动
我可以在屏幕上画静态的东西,但我想让它们随着用户键的输入而移动。我不知道该怎么办,我一直在寻找,还没有找到答案。请帮忙Java 我无法绘制对象并让它们在屏幕上移动,java,swing,jframe,jpanel,keylistener,Java,Swing,Jframe,Jpanel,Keylistener,我可以在屏幕上画静态的东西,但我想让它们随着用户键的输入而移动。我不知道该怎么办,我一直在寻找,还没有找到答案。请帮忙 package com.Game.game; import java.awt.Color; import java.awt.Graphics; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.JFrame; import javax.swing.JPa
package com.Game.game;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Game extends JFrame
{
final static int width = 500;
final static int height = 500;
public int x = 250;
public int y = 250;
public int changeX = 10;
public int changeY = 10;
public static void main(String[] args)
{
new Game();
}
public Game()
{
KeyListener listener = new KeyListening();
addKeyListener(listener);
setFocusable(true);
DrawingStuff drawingstuff = new DrawingStuff();
add(drawingstuff);
setSize(width, height);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public class DrawingStuff extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawString("Hey there!", 300, 300);
g.setColor(Color.RED);
g.fillRect(x, y, 50, 50);
}
}
public class KeyListening implements KeyListener
{
DrawingStuff drawingstuff = new DrawingStuff();
@Override
public void keyPressed(KeyEvent e)
{
if(e.getKeyCode() == KeyEvent.VK_UP)
{
y = y + changeY;
System.out.println("Hey");
drawingstuff.repaint();
}
}
@Override
public void keyReleased(KeyEvent e)
{
}
@Override
public void keyTyped(KeyEvent e)
{
}
}
public void update()
{
}
}
编辑:修复了它。我去掉了构造函数方法中的关键侦听器内容,添加了一个命令来关注构造函数方法中的“drawingstuff”,最重要的是,在构造函数方法的末尾添加了以下代码:
while(true)
{
drawingstuff.repaint();
}
问题在于,您的
keyseating
对象引用的DrawingStuff
对象与您在Game
构造函数中添加到UI的对象不同
public class KeyListening implements KeyListener
{
DrawingStuff drawingstuff = new DrawingStuff();
...
您应该将
DrawingStuff
引用传递给keysiting
实例,这样它就可以告诉正确的对象重新绘制自身。即使这样做有效,在while循环中执行#repaint()
也不是正确的方法。