Java中的Pacman碰撞

问题描述

我正在用Java开发一个pacman街机游戏，但是我的碰撞有问题。 如果看到我的形象 here我的吃豆精灵在走到拐角处或试图转回其出现的方向时（即向左走但不再向右走）静止不动（无x或y运动）。我了解这是因为，如果检测到冲突，我会将xMovement设置为0，将yMovement设置为0（请参见collide（）下的第二个代码块）。

如果我的crash（）不允许这样做，我该如何允许pacman精灵以另一种方式移动（即它来自左侧，我希望它向右移动）或越过一个角落？

下面是App.java类中的draw方法，该方法根据用户的输入绘制播放器。按键分别对应于上，左，下，右。仅使用this.direction，以便在发生碰撞时玩家不会浪费任何举动，也不会穿过墙。 *请注意，我放(this.player.x_ord + 2) % 16 == 0是因为我的吃豆人图像不是16x16图像，这与我的墙壁不同。

public void draw() { // This is an infinite loop
    mapDraw(); // this draws my map constantly so I do not have multiple pacman sprites drawn 
    this.player.tick(); // see second code below for details
    if (keypressed){ // Used wasd rather than arrow keys
        if (key == 's' && this.direction != 's' && (this.player.x_ord + 2) % 16 == 0 && 
        (this.player.y_ord + 4) % 16 == 0){ // We dont want Player to turn ever on a non 16 divisible area
            this.player.p = this.loadImage("src/main/resources/playerDown.png");
            this.player.yMovement = this.player.speed;
            this.player.xMovement = 0;
            this.direction = 's';
        }
        else if (key == 'w' && this.direction != 'w' && (this.player.x_ord + 2) % 16 == 0 && 
        (this.player.y_ord + 4) % 16 == 0){
            this.player.p = this.loadImage("src/main/resources/playerUp.png");
            this.player.yMovement = -this.player.speed;
            this.player.xMovement = 0; // I do not want my pacman to move diagonally so thats why
            this.direction = 'w';

        }
        else if (key == 'd' && this.direction != 'd' && (this.player.x_ord + 2) % 16 == 0 && 
        (this.player.y_ord + 4) % 16 == 0){
            this.player.p = this.loadImage("src/main/resources/playerRight.png");
            this.player.xMovement = this.player.speed;
            this.player.yMovement = 0;
            this.direction = 'd';
        }
        else if (key == 'a' && this.direction != 'a' && (this.player.x_ord + 2) % 16 == 0 && 
        (this.player.y_ord + 4) % 16 == 0){
            this.player.p = this.loadImage("src/main/resources/playerLeft.png");
            this.player.xMovement = -this.player.speed;
            this.player.yMovement = 0;
            this.direction = 'a';
        }
    }
    this.player.draw(this); //see second code below for details
}

下面是我的player.java类 *请再次注意，this.x_ord + 2 == w.x_pos + 16 && this.y_ord + 4 == w.y_pos因为我的吃豆精灵精灵大于我的16x16墙壁而偏移了。

   public void tick(){
    // //logic   
    this.detectCollision();
    if (this.isLiving){
        this.y_ord += this.yMovement;
        this.x_ord += this.xMovement;
    }
}

public void draw(papplet a){ //just draw the sprite
    if (this.isLiving){
        a.image(this.p,this.x_ord,this.y_ord);
    }
    
}

public void collide(boolean isX){ // Is it an x or y collision
    if (isX == true){ // If it moves left or right into a wall
        this.xMovement = 0;
    }
    else if (isX == false){ // If it moves up or down into a wall
        this.xMovement = 0;
    }
}

public void detectCollision(){
    for (Walls w: this.wallLocations){ // A list of wall locations from a .txt file
        if (this.x_ord + 2 == w.x_pos + 16 && this.y_ord + 4 == w.y_pos){ // Detect left movement into right wall piece
            collide(true);
        }

        if (this.x_ord + 2 + 16 == w.x_pos && this.y_ord + 4 == w.y_pos){ // Detect right movement into left wall piece
            collide(true);
        }

        if (this.y_ord + 4 == w.y_pos + 16 && this.x_ord + 2 == w.x_pos){ // Detect up movement into bottom wall piece
            collide(false);
        }

        if (this.y_ord + 4 + 16 == w.y_pos && this.x_ord + 2 == w.x_pos){ // Detect down movement into top wall piece
            collide(false);
        }
    }

对于我的问题的任何帮助，我们深表感谢。

解决方法

我没有深入分析您的代码，但是在我看来，您的主要问题是collide方法仅考虑2种情况，即垂直移动或水平移动。如果要在4个不同的方向上移动，则该方法需要具有4个不同的状态。

为此，您可以创建一个代表方向的枚举。然后在detectCollision中将适当的Direction传递到collide中。最后，在collide中考虑4个不同的方向。例如，如果右侧有障碍，则xMovement必须为非正数。 collide方法看起来像这样：

public void collide(Direction direction){ 
    if (direction == Direction.RIGHT){ 
        this.xMovement = Math.min(0,this.xMovement);
    }
    if (direction == Direction.LEFT){ 
        this.xMovement = Math.max(0,this.xMovement);
    }
    if (direction == Direction.UP){ 
        this.yMovement = Math.min(0,this.yMovement);
    }
    if (direction == Direction.DOWN){ 
        this.yMovement = Math.max(0,this.yMovement);
    }
}