pygame碰撞器研究 pygame-colliders凹边形碰撞检测与凸边形碰撞检测

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Pygame碰撞器提供了比Pygame模块标准的Rect矩形碰撞检测更复杂的功能。
虽然名字是Pygame碰撞器,但它并不和Pygame模块绑定,即不依赖于Pygame模块,
也和Pygame模块没啥关系。你尽管应用它于tkinter模块或其它地方。

安装这个模块的方法是在命令提示符下输入 pip install pygame-colliders 进行安装。

这个库提供了两种碰撞器,一个是convex即凸边形碰撞器,另一种是concave凹边形碰撞器。

下面是一个例子


collider_a_points = [(13, 10), (13, 3), (6, 3), (6, 10)]
collider_a = create_collider(collider_points)                # 创建碰撞器

collider_b_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
collider_b = create_collider(collider_points)

if collider_a.collide(collider_b):
    print("Collision detected")

上面的程序没有指定是使用哪种碰撞器。下面的代码指定了凸碰撞器。


collider_points = [(13, 10), (13, 3), (6, 3), (6, 10)]
collider = ConvexCollider(collider_points)

凹边形是一个或者多个内角大于180度的多边形。它可以分解为多个凸边形。
如果实例化凹碰撞器,最终也是调用凸边形的碰撞检测。下面是创建一个凹碰撞器。

collider_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
collider = ConcaveCollider(collider_points)

上面的代码会创建一像C形状的碰撞器。

下面是test程序:


from pygame_colliders import ConcaveCollider, ConvexCollider


def test_no_collision():
    poly_a_points = [(13, 10), (13, 3), (6, 3), (6, 10)]
    poly_b_points = [(14, 18), (15, 11), (10, 13)]

    poly_a = ConvexCollider(poly_a_points)
    poly_b = ConvexCollider(poly_b_points)

    assert poly_a.collide(poly_b) is False


def test_collision_2():
    collider_a_points = [(13, 20), (13, 13), (6, 13), (6, 20)]
    collider_b_points = [(13, 13), (8, 9), (7, 15)]

    collider_a = ConvexCollider(collider_a_points)
    collider_b = ConvexCollider(collider_b_points)

    assert collider_a.collide(collider_b) is True


def test_collision():
    poly_a = [(11, 10), (11, 3), (4, 3), (4, 10)]
    poly_b = [(13, 13), (8, 9), (7, 15)]

    p_a = ConvexCollider(poly_a)
    p_b = ConvexCollider(poly_b)

    assert p_a.collide(p_b) is True


def test_clockwise():
    poly = [(13, 13), (8, 9), (7, 15)]
    p = ConvexCollider(poly)

    assert p.is_clockwise is True


def test_counter_clockwise():
    poly = [(7, 15), (8, 9), (13, 13)]
    p = ConvexCollider(poly)

    assert p.is_clockwise is False


def test_point_collide():
    poly_points = [(7, 15), (8, 9), (13, 13)]
    point = (10, 12)
    poly = ConvexCollider(poly_points)

    assert poly.point_collide(point) is True


def test_point_not_collide():
    poly_points = [(7, 15), (8, 9), (13, 13)]
    point = (10, 7)
    poly = ConvexCollider(poly_points)

    assert poly.point_collide(point) is False


def test_concave_convex_collision():
    poly_a_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
    poly_b_points = [(4.5, 3.5), (6, 2), (6, 4)]

    poly_a = ConcaveCollider(poly_a_points)
    poly_b = ConvexCollider(poly_b_points)

    assert poly_a.collide(poly_b) is True


def test_convex_concave_collision():
    poly_a_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
    poly_b_points = [(4.5, 3.5), (6, 2), (6, 4)]

    poly_a = ConcaveCollider(poly_a_points)
    poly_b = ConvexCollider(poly_b_points)

    assert poly_b.collide(poly_a) is True


def test_concave_no_collision():
    poly_a_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
    poly_b_points = [(6.5, 3.5), (8, 2), (8, 4)]

    poly_a = ConcaveCollider(poly_a_points)
    poly_b = ConvexCollider(poly_b_points)

    assert poly_a.collide(poly_b) is False


def test_concave_concave_collision():
    poly_a_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
    poly_b_points = [(6.5, 5.5), (4.5, 5.5), (4.5, 6.5), (5.5, 6.5), (5.5, 7.5), (4.5, 7.5), (4.5, 8.5), (6.5, 8.5)]

    poly_a = ConcaveCollider(poly_a_points)
    poly_b = ConcaveCollider(poly_b_points)

    assert poly_a.collide(poly_b) is True

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