mouseMoved方法中的碰撞检测

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Collision detection in mouseMoved method

我正在用java创建一个游戏。在其中，您控制一个跟随鼠标的正方形。我想为正方形实现碰撞检测，使其在 JFrame 内略微停止，而不是在边缘处。使用箭头键执行此操作非常容易，但我无法使用 mouseMoved 方法解决。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();



    }

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();



  }

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);



  }



}
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;

}

这是创建正方形的代码：

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();



    }

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();



  }

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);



  }



}
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;

}

我不认为你会需要这个，但以防万一，这里是 GamePanel 类的所有代码，它用作 Main 类中我的 JFrame 的面板。如果您需要 Main 课程，请告诉我，但我怀疑您会：

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 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();



  }

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);



  }



}
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;

}

感谢您的帮助。如果您需要任何东西，请告诉我。

你的动作代码有点不对劲。仅当 Y 未超出范围并始终替换 Y 值时，才设置 x 位置。我可以建议将来使用完整的块吗？它们有助于避免这样的问题。

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 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();



  }

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);



  }



}
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，然后在玩家出界时进行更正。

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