如何制作透明的pygame.draw.circle [英] How to make transparent pygame.draw.circle

问题描述

如何使 pygame.draw.circle 透明(添加 alpha 级别)，至于surface"set_alpha"?我找到了一个解决方案，只是将 pygame.draw.circle 的颜色更改为不那么亮

解决方案

你必须使用

导入pygamepygame.init()wndsize = (400, 400)窗口 = pygame.display.set_mode(wndsize)时钟 = pygame.time.Clock()运行 = 真运行时:时钟滴答(60)对于 pygame.event.get() 中的事件:如果 event.type == pygame.QUIT:运行 = 错误window.fill(0)pygame.draw.rect(窗口, (0, 0, 255), (0, 0, 200, 400))半径 = 100circle = pygame.Surface((radius*2, radius*2), pygame.SRCALPHA)pygame.draw.circle(circle, (255, 0, 0, 128), (radius, radius), radius)window.blit(circle, (100, 100))pygame.display.flip()

How to make pygame.draw.circle transparent (add alpha level), as for "surface" "set_alpha"? I found a solution only in changing the color of pygame.draw.circle to less bright

解决方案

You've to use a pygame.Surface. Create a Surface with a per pixel alpha image format. e.g:

radius = 100
circle = pygame.Surface((radius*2, radius*2), pygame.SRCALPHA)

And draw a transparent circle on it. The color of the circle has to have an alpha channel < 255 (e.g. 128):

pygame.draw.circle(circle, (255, 0, 0, 128), (radius, radius), radius)

blit() the Surface to the window. e.g.:

window.blit(circle, (100, 100))

Example:

import pygame

pygame.init()
wndsize = (400, 400)
window = pygame.display.set_mode(wndsize)
clock = pygame.time.Clock()

run = True
while run:
    clock.tick(60)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    window.fill(0)
    pygame.draw.rect(window, (0, 0, 255), (0, 0, 200, 400))

    radius = 100
    circle = pygame.Surface((radius*2, radius*2), pygame.SRCALPHA)   
    pygame.draw.circle(circle, (255, 0, 0, 128), (radius, radius), radius)
    window.blit(circle, (100, 100))

    pygame.display.flip()

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