java - Pacman 克隆，当在无法访问的方向按下按钮时，如何让 pacman 保持移动

Question

对不起各位，我不知道标题是否是解释它的最佳方式。我正在使用 libgdx 在 java 中制作 pacman 克隆。我已经在瓷砖上渲染了 map 和碰撞检测。唯一的问题是，无论发生什么情况，吃 bean 人都应该继续移动。当他向右走时，你向下或向上按它被挡住，他就会停下来。我尝试了很多不同的东西，但似乎无法让它正常工作。

这是我的吃 bean 玩家类

package com.psillidev.pacman1;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
import com.badlogic.gdx.math.Rectangle;

public class player {
    private static int height = 16;
    private static int width = 16;

    private int playerX , playerY;
    private int direction;
    private Texture playerTexture;
    private boolean isAlive; 


    public player(int startX,int startY) {
        playerTexture = new Texture(Gdx.files.internal("data/pacman.png"));
        playerX = startX;
        playerY = startY;
    }

    public void move(Map map) {
        if (direction == 0) {
            if (isNoTile(map,direction,getX(),getY())) {
                setY(getY() + (int)(Gdx.graphics.getDeltaTime() + 2));
            }
        }

        if (direction ==1) {
            if (isNoTile(map,direction,getX(),getY())) {
                setX(getX() + (int)(Gdx.graphics.getDeltaTime() + 2));
            }
        }

        if (direction ==2) {
            if (isNoTile(map,direction,getX(),getY())) {
                setY(getY() - (int)(Gdx.graphics.getDeltaTime() + 2));
            }
        }

        if (direction ==3) {
            if (isNoTile(map,direction,getX(),getY())) {
                setX(getX() - (int)(Gdx.graphics.getDeltaTime() + 2));
            }
        }

    }

    private boolean isNoTile(Map map, int dir, int translated_x, int translated_y) {
        System.out.println("X: " + translated_x + " Y: " + translated_y);
        for (Rectangle r : map.getBlockedTiles()) {

            switch (dir) {
            case 0:
                Rectangle up = new Rectangle(translated_x,translated_y + 2 , 16, 16);

                if (up.overlaps(r)) {

                    return false;

                }
                break;

            case 1:
                Rectangle right = new Rectangle(translated_x+2,translated_y, 16, 16);
                if (right.overlaps(r)) {
                    return false;
                }
                break;

            case 2:
                Rectangle down = new Rectangle(translated_x,translated_y - 2, 16, 16);
                if (down.overlaps(r)) {
                    return false;
                }
                break;

            case 3:
                Rectangle left = new Rectangle(translated_x-2,translated_y, 16, 16);
                if (left.overlaps(r)) {
                    return false;
                }
                break;

            default:
                break;
            }
        }

        return true;
    }

    public void render(SpriteBatch batch) {
        batch.draw(playerTexture, playerX, playerY);
    }

    public int getX() {
        return playerX;
    }

    public void setX(int x) {
        playerX = x;
    }

    public int getY() {
        return playerY;
    }

    public void setY(int y) {
        playerY = y;
    }

    public int getDirection() {
        return direction;
    }

    public void setDirection(int dir) {

        direction = dir;
    }

    public Rectangle getRect() {
        return new Rectangle(playerX,playerY,width,height);
    }
}

Answer 1

我无法根据您提供的代码做出回答，但我的建议是您需要对您的 KeyListener 类进行调整。我假设您有一个 KeyListener 正在监听用户按下箭头键。按下某个键时，您是否正在执行类似 Pacman.setDirection() 的操作？

您实际上需要做的是在调用 setDirection() 之前检测方向是否有效。所以你的 KeyListener 代码应该是这样的......

1. 判断用户按下的是上、下、左还是右
2. 检查游戏网格/ map 以查看基于吃 bean 人当前位置的方向是否有效
3. 如果方向有效，调用setDirection()。如果不是，则不要调用任何东西，Pacman 将继续当前方向。