我正在编写Tower Defense游戏，现在我已经遇到了与MouseListener相关的一些问题。我已经创建了类Mouse Hanlder（它实现了Mouse Listener）和第二个类，其中全屏由paint（Graphics g）制作。我想检查玩家是否按下塔来购买它。不起作用的是，getX（）和getY（）从我的屏幕返回0而不是右坐标。我应该改变什么？
public class MouseHandler implements MouseListener, MouseMotionListener {
private GameScreen screen;
private GameScreen.MouseHeld mouseHeld;
public MouseHandler(GameScreen screen){
this.screen = screen;
this.mouseHeld = this.screen.new MouseHeld();
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
this.mouseHeld.mouseDown(e);
}
public void mouseReleased(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
this.mouseHeld.mouseMove(e);
}
public void mouseMoved(MouseEvent e) {
this.mouseHeld.mouseMove(e);
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
}
用屏幕上课：
public class GameScreen extends JPanel implements Runnable {
private static final long serialVersionUID = 1L;
public Thread thread = new Thread(this)
public GameScreen(GameFrame frame) {
this.frame = frame;
this.setSize(1280, 800);
this.addMouseListener(new MouseHandler(this));
thread.start();
}
public void paint(Graphics g) {
// Code with my painted screen
}
// Some code with running game
public class MouseHeld {
boolean mouseDown = false;
int hand = 0;
int handXPos;
int handYPos;
public void mouseDown(MouseEvent e) {
mouseDown = true;
if(hand != 0){
hand = 0;
}
System.out.println(handYPos);
System.out.println(handXPos);
uptadeMouse(e);
}
public void mouseMove(MouseEvent e) {
handXPos = e.getX();
handYPos = e.getY();
}
public void uptadeMouse(MouseEvent e) {
if (mouseDown && hand == 0) {
if (handYPos <= 680 && handYPos >= 640) {
// Tower 1
if (handXPos >= 300 && handXPos <= 340) {
if (player.money >= Tower.allTowers[0].cost) {
System.out.println("You bought a tower!");
hand = 1;
}
}
}
}
}
}
}
答案 0 :(得分：2)
您只能在mouseMove中更新handXPos和handYPos，而不能更新其他鼠标方法。您永远不会将处理程序添加为MouseMotionListener，因此永远不会调用mouseMove。
如，
public GameScreen(GameFrame frame) {
this.frame = frame;
this.setSize(1280, 800); // avoid this
MouseHandler mouseHandler = new MouseHandler(this);
addMouseListener(mouseHandler);
addMouseMotionListener(mouseHandler);
}
另一个更好的解决方案是在所有使用的鼠标方法中更新handXPos和handYPos。
这是我的最小测试计划，您应该为将来的问题提供这些计划：
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.*;
import javax.swing.*;
public class FooGui {
private static void createAndShowGui() {
FooGui mainPanel = new FooGui();
GameFrame frame = new GameFrame("Foo Gui");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(new GameScreen(frame));
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
class MouseHandler implements MouseListener, MouseMotionListener {
private GameScreen screen;
private GameScreen.MouseHeld mouseHeld;
public MouseHandler(GameScreen screen) {
this.screen = screen;
this.mouseHeld = this.screen.new MouseHeld();
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
this.mouseHeld.mouseDown(e);
}
public void mouseReleased(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
this.mouseHeld.mouseMove(e);
}
public void mouseMoved(MouseEvent e) {
this.mouseHeld.mouseMove(e);
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
}
class GameScreen extends JPanel {
private static final long serialVersionUID = 1L;
private static final int PREF_W = 400;
private static final int PREF_H = PREF_W;
private GameFrame frame;
public GameScreen(GameFrame frame) {
this.frame = frame;
this.setSize(1280, 800);
MouseHandler mouseHandler = new MouseHandler(this);
addMouseListener(mouseHandler);
addMouseMotionListener(mouseHandler);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
public class MouseHeld {
boolean mouseDown = false;
int handXPos;
int handYPos;
public void mouseDown(MouseEvent e) {
mouseDown = true;
System.out.println(handYPos);
System.out.println(handXPos);
uptadeMouse(e);
}
public void mouseMove(MouseEvent e) {
handXPos = e.getX();
handYPos = e.getY();
}
public void uptadeMouse(MouseEvent e) {
}
}
}
class GameFrame extends JFrame {
public GameFrame(String name) {
super(name);
}
}
还要避免覆盖JPanel的绘制方法，而是使用paintComponent
退房：