我正在用Java创建游戏。在其中，您可以控制跟随鼠标的正方形。我想对正方形实施碰撞检测，以使其在JFrame中稍微停下来，而不是在边缘处停下来。使用箭头键执行此操作非常容易，但是我无法使用mouseMoved方法来解决。这是mouseMoved方法所在的代码：
public void mouseMoved(MouseEvent e){
repaint();
if(e.getX() <= 0)
playerX = 0;
if(e.getX() >= 300)
playerX = 500;
if(e.getY() <= 0)
playerY = 0;
if(e.getY() >= 300)
playerY = 500;
else
playerX = e.getX()-25;
playerY = e.getY()-25;
repaint();
}
这是创建正方形的代码：
public void paintComponent(Graphics g) {
Rectangle player = new Rectangle(playerX, playerY, 50, 50);
g.setColor(Color.blue);
g.fillRect(player.x, player.y, player.width, player.height);
repaint();
}
我认为您不需要它，但是以防万一，这是GamePanel类的所有代码，该类充当Main类中JFrame的面板。如果您需要主班让我知道，但我怀疑您会：
package main;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JPanel;
public class GamePanel extends JPanel implements Runnable{
//Global variables
//Double buffering
private Image dbImage;
private Graphics dbg;
//JPanel variables
static final int GWIDTH = 500, GHEIGHT = 500;
static final Dimension gameDim = new Dimension(GWIDTH, GHEIGHT);
//Game variable
private Thread game;
private volatile boolean running = false;
public boolean mouseClicked = false;
//Character variables
int playerX = 150, playerY = 150;
public class Mouse extends MouseAdapter{
public void mousePressed(MouseEvent e){
mouseClicked = true;
}
public void mouseReleased(MouseEvent e){
mouseClicked = false;
}
public void mouseMoved(MouseEvent e){
repaint();
if(e.getX() <= 0)
playerX = 0;
if(e.getX() >= 300)
playerX = 500;
if(e.getY() <= 0)
playerY = 0;
if(e.getY() >= 300)
playerY = 500;
else
playerX = e.getX()-25;
playerY = e.getY()-25;
repaint();
}
}
public GamePanel(){
addMouseMotionListener(new Mouse());
setPreferredSize(gameDim);
setBackground(Color.BLUE);
setFocusable(true);
requestFocus(true);
}
public void run(){
while(running){
}
}
public void addNotify(){
super.addNotify();
startGame();
}
private void startGame(){
if(game == null || !running){
game = new Thread(this);
game.start();
running = true;
}
}
public void stopGame(){
if(running){
running = false;
}
//Paint method
}
public void paint(Graphics g){
dbImage = createImage(getWidth(), getHeight());
dbg = dbImage.getGraphics();
paintComponent(dbg);
g.drawImage(dbImage, 0, 0, this);
}
public void paintComponent(Graphics g) {
Rectangle player = new Rectangle(playerX, playerY, 50, 50);
g.setColor(Color.blue);
g.fillRect(player.x, player.y, player.width, player.height);
repaint();
}
private void log(String s){
System.out.println(s);
}
}
感谢您的帮助。请让我知道您是否需要任何东西。
最佳答案
您的移动代码有点错误。仅当Y不超出范围时才设置x位置，并始终替换Y值。我能否在将来建议全部屏蔽-它们有助于避免此类问题。
playerX = e.getX()-25;
playerY = e.getY()-25;
if(e.getX() <= 0){
playerX = 0;
}
else if(e.getX() >= 300){
playerX = 500;
}
if(e.getY() <= 0){
playerY = 0;
}
else if(e.getY() >= 300){
playerY = 500;
}
这将首先设置位置，然后在玩家超出范围时对其进行更正。