Pygame 碰撞点 () 无法正常工作

Question

我正在制作一个游戏，你可以在其中砍伐树木并想要它，以便你只能砍伐你在游戏中的位置（由一个正方形）。问题是，当我测试它时，我发现它只起作用了一次，我的意思是你只需要移动来阻止半径屏障起作用，你就可以摧毁任何一棵树。有人能告诉我为什么会这样以及如何解决吗？代码如下：

# I'll only put in the bit that makes the bug
# Tree objects are sorted in a Tree class with a method destroy() to destroy the tree
for tree in trees:
    if pygame.mouse.get_pressed()[0] and tree.trunk.collidepoint(pygame.mouse.get_pos()):
        mouse_x, mouse_y = pygame.mouse.get_pos()
        print('clicked tree') # For testing purposes
        if mouse_x < x + 51 and mouse_y < y + 51:
            countdown = 3
            destroy_tree = tree
        elif mouse_x < x + 51 and mouse_y < y - 51:
            countdown = 3
            destroy_tree = tree
        elif mouse_x < x - 51 and mouse_y < y - 51:
            countdown = 3
            destroy_tree = tree
        elif mouse_x < x - 51 and mouse_y < y + 51:
            countdown = 3
            destroy_tree = tree

Answer 1

你必须评估坐标是否在一个范围内，在一个相同的条件下。你实际做的是这样的：

if x < value + 50:
   countdown = 3
elif x > value - 50:
   countdown = 3

总是满足其中一个条件，最后 countdown 在任何情况下都成立。

条件必须是：

if x - 51 < mouse_x < x + 51:
    if y - 51 < mouse_y < y + 51:
        countdown = 3
        destroy_tree = tree

此外，使用abs()可以简化算法。例如：

mouse_x, mouse_y = pygame.mouse.get_pos()
for tree in trees:
    if pygame.mouse.get_pressed()[0] and tree.trunk.collidepoint((mouse_x, mouse_y)):
        print('clicked tree') # For testing purposes

        dx = mouse_x - x
        dy = mouse_y - y
        if abs(dx) <= 50 and abs(dy) <= 50:
            countdown = 3
            destroy_tree = tree

或者您可以计算 Euclidean distance:

mouse_x, mouse_y = pygame.mouse.get_pos()
for tree in trees:
    if pygame.mouse.get_pressed()[0] and tree.trunk.collidepoint((mouse_x, mouse_y)):
        print('clicked tree') # For testing purposes

        dx, dy = (mouse_x - x, mouse_y - y)
        if dx*dx + dy*dy <= 50*50:
            countdown = 3
            destroy_tree = tree

Pygame 碰撞点 () 无法正常工作

Pygame collidepoint() not working correctly

python

pygame

click

python-3.x