蛇游戏-不能控制蛇

贴底的实际问题!
首先,我想解释一下我的问题。

我正在写一个基本的蛇游戏,我让蛇自动移动。当您执行代码时,它会自动移动到窗口的右侧,就像预期的那样。但是,我不能按我想要的方向控制我的蛇,它根本不会改变方向。

为了避免混淆, player 是类的实例 Snake .

要解释蛇的运动:

这个 蛇 对象具有 coordinates 属于ArrayList保留的属性 SnakePart 物体。各 蛇形零件 对象具有属性 x 和 y . 使用这个数组列表,蛇通过在画布上绘制小矩形来移动。 X 和 Y 画布Y轴和X轴上的属性。

这个 蛇 对象还具有 dx 和A dy 属性,该属性将添加(或减去--取决于蛇的方向) X 和 Y 性质 蛇形零件 使蛇向某个方向移动。

在中更新arraylist Snake.java :

public void move() {
  SnakePart head = new SnakePart(this.coordinates.get(0).x + this.dx, this.coordinates.get(0).y + this.dy);

  this.coordinates.add(0, head);
  this.coordinates.remove(this.coordinates.size() - 1);
}

在画布上画蛇 Board.java (部分原因是目前不需要其他方法):

@Override
public void paintComponent(Graphics g) {
  this.player.coordinates.forEach(snakePart -> {
    g.setColor(Color.BLUE);
    g.fillRect(snakePart.x, snakePart.y, 10, 10);
  });
}

为了控制蛇的方向,我想用箭头键。根据按下哪个箭头键,蛇的 X 和 Y 修改坐标/属性( 爪哇岛 ):

@Override
public void keyPressed(KeyEvent event) {
  int keyCode = event.getKeyCode();

  if (keyCode == 37) {
    this.player.dx = -10;
    this.player.dy = 0;
  } else if (keyCode == 38) {
    this.player.dx = 0;
    this.player.dy = -10;
  } else if (keyCode == 39) {
    this.player.dx = 10;
    this.player.dy = 0;
  } else if (keyCode == 40) {
    this.player.dx = 0;
    this.player.dy = 10;
  }
}

完整代码:

爪哇蛇 :

package com.codef0x.snake;
import java.util.ArrayList;

public class Snake {
  ArrayList < SnakePart > coordinates;
  int dx = 10;
  int dy = 0;

  public Snake(ArrayList < SnakePart > coords) {
    this.coordinates = coords;
  }

  public void move() {
    SnakePart head = new SnakePart(this.coordinates.get(0).x + this.dx, this.coordinates.get(0).y + this.dy);

    this.coordinates.add(0, head);
    this.coordinates.remove(this.coordinates.size() - 1);
  }

  public void grow() {
    SnakePart newPart = new SnakePart(0, 0);
    newPart.x = this.coordinates.get(this.coordinates.size() - 1).x - 10;
    newPart.y = this.coordinates.get(this.coordinates.size() - 1).y;

    this.coordinates.add(this.coordinates.size() - 1, newPart);
  }
}

爪哇岛 (只显示相关部分,否则代码太多)

package com.codef0x.snake;

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;


public class Board extends JPanel implements KeyListener {
  Snake player;
  ArrayList<SnakePart> snakeCoordinates;

  public Board() {

    this.snakeCoordinates = new ArrayList<>();

    snakeCoordinates.add(new SnakePart(150, 150));
    snakeCoordinates.add(new SnakePart(140, 150));
    snakeCoordinates.add(new SnakePart(130, 150));
    snakeCoordinates.add(new SnakePart(120, 150));

    this.player = new Snake(snakeCoordinates);

    this.food = new Food();
  }

  @Override
  public void paintComponent(Graphics g) {
    clear(g);

    this.player.coordinates.forEach(snakePart - > {
      g.setColor(Color.BLUE);
      g.fillRect(snakePart.x, snakePart.y, 10, 10);
    });
  }

  public void clear(Graphics g) {
    g.clearRect(0, 0, getHeight(), getWidth());
  }

  @Override
  public void update(Graphics g) {
    paintComponent(g);
  }

  @Override
  public void keyPressed(KeyEvent event) {
    int keyCode = event.getKeyCode();

    if (keyCode == 37) {
      this.player.dx = -10;
      this.player.dy = 0;
    } else if (keyCode == 38) {
      this.player.dx = 0;
      this.player.dy = -10;
    } else if (keyCode == 39) {
      this.player.dx = 10;
      this.player.dy = 0;
    } else if (keyCode == 40) {
      this.player.dx = 0;
      this.player.dy = 10;
    }
  }

  @Override
  public void keyTyped(KeyEvent event) {
    return;
  }

  @Override
  public void keyReleased(KeyEvent event) {
    return;
  }

  public void run(Board board) {
    Timer game = new Timer();
    game.schedule(new TimerTask() {
      boolean initiallySpawned = false;
      @Override
      public void run() {
        Graphics g = board.getGraphics();

        if (hitSomething()) { // removed method hitSomething, not relevant
          game.cancel();
          return;
        }

        player.move();
        update(g);
      }
    }, 0, 500);
  }
}

SnakePart.java :

package com.codef0x.snake;

public class SnakePart {
  int x;
  int y;

  public SnakePart(int x, int y) {
    this.x = x;
    this.y = y;
  }
}

我做错了什么?我需要做什么来正确地控制蛇?

如果您仍然希望/需要将所有文件作为一个整体查看,可以在此处查看它们:

Snake.java
Board.java
SnakePart.java
Food.java <-不相关,但可以防止混淆 Food 对象