圆圈正好在两个正方形之间时会改变其方向

Question

我有一个Box2D世界，其中的圆圈代表行人，正方形代表建筑物，我有一个算法可以找到最近的建筑物，然后它将在边缘旋转，但是我有一个问题，当它恰好位于之间建筑物，因此该算法有效，但不适用于我想要的方式

def pedestrian_walk(pedestrian, buildings):
    ## Find the building nearest to the pedestrian
    list_of_distances = []
    for building in buildings:
        list_of_distances.append(np.sqrt((pedestrian.body.position[0] - building.footprint.position[0])**2 + (pedestrian.body.position[1] - building.footprint.position[1])**2))
    pedestrian.nearest_building= list_of_distances.index(min(list_of_distances))
    #print(f"Nearest builing index is: {pedestrian.nearest_building}")


    building = buildings[pedestrian.nearest_building]

    #Pedestrian walks around the left side of the nearest building
    if pedestrian.body.position[0] <= building.position[0] and  building.position[1] - building.shape[1] <= pedestrian.position[1] <= building.position[1] + 1.05*building.shape[1]:
        pedestrian.body.__SetLinearVelocity(b2Vec2(0,pedestrian.ped_velocity))
        print("1st if")
    #Pedestrian walks around the right side of the nearest building
    elif pedestrian.body.position[0] > building.position[0] and building.position[1] - building.shape[1] <= pedestrian.position[1]<= building.position[1] + 1.05*building.shape[1]:
        pedestrian.body.__SetLinearVelocity(b2Vec2(0,-pedestrian.ped_velocity))
        print("2nd if")

    #Pedestrian walks around the upper side of the nearest building
    elif pedestrian.body.position[1] > building.position[1] and building.position[0] - building.shape[0] <= pedestrian.position[0] <= building.position[0] + 1.05*building.shape[0]:
        pedestrian.body.__SetLinearVelocity(b2Vec2(pedestrian.ped_velocity,0))
        print("3rd if")
    #Pedestrian walks around the lower side of the nearest building
    elif pedestrian.body.position[1] <= building.position[1] and building.position[0] - building.shape[0] <= pedestrian.position[0] <= building.position[0] + 1.05*building.shape[0]:
        pedestrian.body.__SetLinearVelocity(b2Vec2(-pedestrian.ped_velocity,0))
        print("4th if")

我在pygame主游戏循环中调用了该函数，它可以正常运行：

Skyscrapers = create four buildings
while running:

...

    while k <= MAX_AMOUNT_PEDESTRIANS:
        random_skyscraper = random.choice(skyscrapers) #Randomly choose a skyscraper next to which a pedestrian is generated
        skyscraper_to_walk_around.append(random_skyscraper)
        new_walker = Pedestrian(box2world, position = (random_skyscraper.position[0] -random.randint(-random_skyscraper.shape[0],random_skyscraper.shape[0]),\
                            random_skyscraper.position[1] -random.randint(-random_skyscraper.shape[1],random_skyscraper.shape[1])))
        walkers.append(new_walker)
        positive_negative.append([-1,1][random.randrange(2)])
        k = k+1

    for ped in range(MAX_AMOUNT_PEDESTRIANS):
        pedestrian_walk(walkers[ped],skyscrapers)

[如果可能的话，我将有另一个请求，是否还有其他“ pythonic”方式使代码更简单或更简洁（但这是第二个问题，我需要首先解决问题）？非常感谢]]

编辑：我的代码背后的主要思想是：我有行人和建筑物类，行人是动态物体，而建筑物是静态物体。我需要行人到最近的建筑物走动并穿过“街道”（我试图在上一个问题“ Rolling a circle around a square”中找到可行的算法，在这里您可以找到我对这两个类别的定义。我能够解决滚动问题，它不能完美运行，但令人满意]

问题是，当行人试图越过“街道”时，它恰好位于两座建筑物之间的中间，它仍然没有向前移动到第二座建筑物，而是转过90°，然后“在路中间“

问题出在if语句中，当它更改最接近的建筑参数时，如果不知道该如何解决，它也会从第1个if跳过到第3个。。。

我尽力使自己清楚，但是如果仍然有关于我的代码的问题，我可以发布我的代码（我试图避免这种情况，因为它不是很短的代码）

我尝试按照下面的注释中的建议，为最近的建筑物更改函数中的代码，但是很遗憾，它没有用

[图像：这是当前操作的图像，我希望黄色圆圈（“行人”）在这些蓝色线条（“栅栏”）指定的范围内绕着这些蓝色正方形（“建筑物”）走动。我希望行人找到他们最近的建筑物（可以正常运行），然后在建筑物周围走动，或者至少在他们到达最近建筑物的拐角处时转弯，但是您可以看到，当“ nearest_building”出现时，行人改变了方向“参数已更改...很明显，他们正走在“街道”的中间...这是错误的

我有一个Box2D世界，其中的圆圈代表行人，正方形代表建筑物，我有一个算法可以找到最近的建筑物，然后它将在边缘转弯，但是我有一个...

Answer 1

嗯，最终，我自己找到了答案，问题是我没有正确设置if语句的限制，现在可以了。我做了这个改进：

def pedestrian_walk(pedestrian, buildings):
    ## Find the building nearest to the pedestrian
    list_of_distances = []
    for building in buildings:
        list_of_distances.append(np.sqrt((pedestrian.body.position[0] - building.footprint.position[0])**2 + (pedestrian.body.position[1] - building.footprint.position[1])**2))
    pedestrian.nearest_building= list_of_distances.index(min(list_of_distances))
    #print(f"Nearest builing index is: {pedestrian.nearest_building}")

    building = buildings[pedestrian.nearest_building]
    #Pedestrian walks around either the left or right side of the nearest building
    if building.position[0] - 1.15*building.shape[0]  <=pedestrian.body.position[0] <= building.position[0] + 1.15*building.shape[0]  and  building.position[1] - building.shape[1] <= pedestrian.position[1] <= building.position[1] + 1.05*building.shape[1]:
        pedestrian.body.__SetLinearVelocity(b2Vec2(0,pedestrian.ped_velocity))
        print("1st if")

    #Pedestrian walks around either lower or upper side of the nearest building
    elif building.position[1] - 1.15*building.shape[1] <= pedestrian.body.position[1] <= building.position[1] + 1.15*building.shape[1]:
        pedestrian.body.__SetLinearVelocity(b2Vec2(-pedestrian.ped_velocity,0))
        print("2nd if")