我的碰撞检测无法正常工作

Question

我在 python 中使用 pygame 和数学模块编写游戏。我写了这些代码来进行碰撞检测（我设置了 5 个障碍物，我希望我的玩家与之碰撞）但问题是在玩游戏的过程中，有时有效，有时无效。

这些是我定义的碰撞函数

def collide1(binX, binY, playerX, playerY):
    distance = math.sqrt(math.pow(binX - playerX, 2) + math.pow(binY - playerY, 2))
    if distance == 27:
        return True
    else:
        return False


def collide2(snowX, snowY, playerX, playerY):
    distance = math.sqrt(math.pow(snowX - playerX, 2) + math.pow(snowY - playerY, 2))
    if distance == 27:
        return True
    else:
        return False


def collide3(glacierX, glacierY, playerX, playerY):
    distance = math.sqrt(math.pow(glacierX - playerX, 2) + math.pow(glacierY - playerY, 2))
    if distance == 27:
        return True
    else:
        return False


def collide4(boardX, boardY, playerX, playerY):
    distance = math.sqrt(math.pow(boardX - playerX, 2) + math.pow(boardY - playerY, 2))
    if distance == 27:
        return True
    else:
        return False


def collide5(iceX, iceY, playerX, playerY):
    distance = math.sqrt(math.pow(iceX - playerX, 2) + math.pow(iceY - playerY, 2))
    if distance == 27:
        return True
    else:
        return False

在 while 循环中

# Collision Detection
collision1 = collide1(binX, binY, playerX, playerY)
collision2 = collide2(snowX, snowY, playerX, playerY)
collision3 = collide3(glacierX, glacierY, playerX, playerY)
collision4 = collide4(boardX, boardY, playerX, playerY)
collision5 = collide5(iceX, iceY, playerX, playerY)

if collision1:
    print("You have collided!")
elif collision2:
    print("You have collided!")
elif collision3:
    print("You have collided!")
elif collision4:
    print("You have collided!")
elif collision5:
    print("You have collided!")

请告诉我哪里做错了。

Answer 1

现在只有当距离恰好为 27 时才会发生碰撞。如果你假设是球体，如果它们的距离小于 27 像素，你仍然可以认为它们在“碰撞”。

所以用 if distance <= 27: 替换所有距离，注意小于或等于。

另外需要注意的是计算平方根的速度非常慢。检查 distance_squared <= 27 * 27 是否比 math.pow(distance_squared, 0.5) <= 27.

要快得多

Answer 2

实际上，您只是在检查玩家是否碰到了障碍物，但是如果玩家与障碍物相交，您将错过碰撞。您必须评估 distance <= 27 而不是 distance == 27。此外，碰撞测试实现1个功能就完全足够了。

def collide(x1, y1, x2, y2):
    distance = math.sqrt(math.pow(x1 - x2, 2) + math.pow(y1 - y2, 2))
    if distance <= 27:
        return True
    else:
        return False

函数可以进一步简化：

def collide(x1, y1, x2, y2):
    distance = math.hypot(x1 - x2, y1 - y2)
    return distance <= 27

使用循环做碰撞测试：

obstacles = [(binX, binY), (snowX, snowY), (glacierX, glacierY), (boardX, boardY), (iceX, iceY)]

for x, y in obstacles:
    collision = collide(x, y, playerX, playerY)
    if collision:
        print("You have collided!")

我的碰撞检测无法正常工作

My collision detection is not working properly

python

pygame

collision