python pygame 掩码碰撞

Question

当我尝试使用这段代码时，它只适用于 1 个对象，而不适用于所有对象。我正在尝试修改此视频 (https://www.youtube.com/watch?v=Idu8XfwKUao) 中的代码。有没有更简单的方法得到结果？如果有，请告诉我

#part of code that doesn't matter
randomx = [100,400,300]
randomy = [100,0,300]
green_blob = pygame.image.load("greenblob-59x51.png").convert_alpha()
orange_blob = pygame.image.load("orangeblob-59x51.png").convert_alpha()
blob_mask = pygame.mask.from_surface(green_blob)
blob_color = green_blob
obstacle = []
obstacle_mask = []
oy = []
ox = []
for i in range(4):
    obstacle.append(pygame.image.load("obstacle-400x399.png").convert_alpha())
    obstacle_mask.append(pygame.mask.from_surface(obstacle[i]))
    ox.append(random.choice(randomx))
    oy.append(random.choice(randomy))
# main loop
while True:
    events()
    for i in range(4):
        mx, my = pygame.mouse.get_pos()

        offset = ((mx - int(ox[i]))), ((my - int(oy[i])))
        result = obstacle_mask[i].overlap(blob_mask, offset)
        if result:
            blob_color = orange_blob
        else:
            blob_color = green_blob
        screen.blit(obstacle[i], (ox[i], oy[i]))
        screen.blit(blob_color, (mx, my))



    pygame.display.update()
    CLOCK.tick(FPS)
    screen.fill(BLACK)

Answer 1

您的应用程序运行良好。问题是，overlap 的每次评估结果都会导致 blob_color 的变化。所以循环中的最后一个障碍"wins"。如果最后一个障碍overlaps是blob，那么颜色就是orange_blob，否则就是green_blob.
在循环之前设置绿色。如果有任何障碍 overlaps blob，则将其更改为橙色。 blob 必须在循环后绘制一次。例如：

while True:
    events()

    blob_color = green_blob
    for i in range(4):
        mx, my = pygame.mouse.get_pos()

        offset = (int(mx - ox[i]), int(my - oy[i]))
        if obstacle_mask[i].overlap(blob_mask, offset):
            blob_color = orange_blob

        screen.blit(obstacle[i], (ox[i], oy[i]))

    screen.blit(blob_color, (mx, my))

要在不重叠的随机位置找到障碍物，您必须评估新障碍物是否撞到任何以前的障碍物。
创建一个随机位置：

x, y = random.randint(100, 400), random.randint(100, 400)

并评估是否有 any 个障碍 overlap 作为新位置。

isect = any(obstacle_mask[j].overlap(obstacle_mask[i], (x-ox[j], y-oy[j])) for j in range(i))

如果是这样，则重复该过程。创建一个新的随机位置并测试重叠：

obstacle = []
obstacle_mask = []
oy = []
ox = []
for i in range(4):
    obstacle.append(pygame.image.load("obstacle-400x399.png").convert_alpha())
    obstacle_mask.append(pygame.mask.from_surface(obstacle[i]))

    isect = True
    while isect:
        x, y = random.randint(100, 400), random.randint(100, 400)
        isect = any(obstacle_mask[j].overlap(obstacle_mask[i], (x-ox[j], y-oy[j])) for j in range(i))

    ox.append(x)
    oy.append(y)

python pygame 掩码碰撞

python pygame mask collision

python

pygame

mask