Question

我正在尝试开发碰撞检测。由于某种原因，冲突正在为LinkedList中的最后一个实体工作。我已尽力使用控制台调试它以查看它停止的位置，但我没有运气。所有其他实体都不工作，只有最后一个实体。这是代码：

public class Player implements Entity {

Image player;

public float x = 100f;
public float y = 100f;

boolean canGoLeft = true;
boolean canGoRight = true;
boolean canGoUp = true;
boolean canGoDown = true;

public float speed = 0.15f;

public Rectangle leftRect;
public Rectangle rightRect;
public Rectangle topRect;
public Rectangle bottomRect;

int i = 0;

Entities entities = new Entities();

public Player() {

}

public void update(GameContainer game, int delta) {

    if(Keyboard.isKeyDown(Keyboard.KEY_D)) {
        if(canGoRight) {
            x += speed * delta; 
        }
    }

    if(Keyboard.isKeyDown(Keyboard.KEY_A)) {
        if(canGoLeft) {
            x -= speed * delta;
        }
    }

    if(Keyboard.isKeyDown(Keyboard.KEY_W)) {
        if(canGoUp) {
            y -= speed * delta; 
        }
    }

    if(Keyboard.isKeyDown(Keyboard.KEY_S)) {
        if(canGoDown) {
            y += speed * delta;
        }
    }

    for(Entity entity : Game.entities.entities) {
        checkCollisions(entity);
    }

}

public void render(GameContainer game, Graphics g) {

    leftRect = new Rectangle(x, y + 5, 2, 80);
    rightRect = new Rectangle(x + 45, y + 5, 2, 80);
    topRect = new Rectangle(x + 6, y, 36, 2);
    bottomRect = new Rectangle(x + 6, y + 90, 36, 2);

    //rect = new Rectangle(200, 100, 60, 88);

    try {
        player = new Image("res/Player.png");
        player.setFilter(Image.FILTER_NEAREST);
    } catch (SlickException e) {
        e.printStackTrace();
    }


    player.draw(x, y, 60, 88);

    //g.draw(leftRect);
    //g.draw(rightRect);
    //g.draw(topRect);
    //g.draw(bottomRect);

}

public void checkCollisions(Entity entity) {

    // Collision Detection

    canGoLeft = !leftRect.intersects(entity.getRect());
    canGoRight = !rightRect.intersects(entity.getRect());
    canGoDown = !bottomRect.intersects(entity.getRect());
    canGoUp = !topRect.intersects(entity.getRect());

}

public Rectangle getRect() {
    return null;
}

}

Answer 1

遍历整个列表，但checkCollisions每次调用时都会覆盖canGoLeft，canGoRright等的值。

您应该执行类似

的操作

canGoLeft = canGoLeft && !leftRect.intersects(entity.getRect());

为什么LinkedList不通过所有实体？

1 个答案: