我想在運行時動態更改矩形的顏色。當前set_colour正在用單一顏色值填充表面的所有像素。這是可行的，但是當調用類似的方法時會出現問題set_outline，該方法會修改表面的透明度。class Rectangle(pg.sprite.Sprite): def __init__(self): pg.sprite.Sprite.__init__(self) self.original_image = pg.Surface((10, 10)) self.image = self.original_image self.rect = self.image.get_rect() def set_colour(self, colour_value): self.colour = colour_value self.image.fill(self.colour) self.original_image.fill(self.colour) def set_outline(self, thickness): self.thickness = thickness size = self.image.get_size() calc = thickness/100 p_width, p_height = size[0], size[1] width, height = size[0]*calc, size[1]*calc self.image = self.image.convert_alpha() center_x, center_y = (p_width//2)-(width//2), (p_height//2)-(height//2) pg.draw.rect(self.image, (0, 0, 0, 0), (center_x, center_y, width, height))現在，如果我嘗試在運行時更改該矩形的顏色，它將覆蓋在set_outline.有沒有辦法將顏色遮罩或混合到矩形上，這樣它就不會替換任何透明度？
1 回答
臨摹微笑
TA貢獻1982條經驗 獲得超2個贊
您可以通過 2 個步驟來實現這一目標。self.original_image包含具有所需顏色的填充矩形：
self.original_image.fill(self.colour)
生成一個全白色的矩形和透明區域。使用 ( self.image) 和混合模式混合矩形BLEND_MAX（參見 pygame.Surface.blit）：
whiteTransparent = pg.Surface(self.image.get_size(), pg.SRCALPHA) whiteTransparent.fill((255, 255, 255, 0)) self.image.blit(whiteTransparent, (0, 0), special_flags=pg.BLEND_MAX)
現在矩形是完全白色的，但透明區域被保留。使用混合模式BLEND_MULT并混合self.original_image以self.image獲得所需的結果：
self.image.blit(self.original_image, (0, 0), special_flags=pg.BLEND_MULT)
最小的例子：
repl.it/@Rabbid76/PyGame-ChangeColorOfSpriteArea
https://i.stack.imgur.com/oldLt.gif
import pygame as pg
class Rectangle(pg.sprite.Sprite):
def __init__(self):
pg.sprite.Sprite.__init__(self)
self.original_image = pg.Surface((150, 150))
self.image = self.original_image
self.rect = self.image.get_rect(center = (150, 150))
def set_colour(self, colour_value):
self.colour = colour_value
self.original_image.fill(self.colour)
whiteTransparent = pg.Surface(self.image.get_size(), pg.SRCALPHA)
whiteTransparent.fill((255, 255, 255, 0))
self.image.blit(whiteTransparent, (0, 0), special_flags=pg.BLEND_MAX)
self.image.blit(self.original_image, (0, 0), special_flags=pg.BLEND_MULT)
def set_outline(self, thickness):
self.thickness = thickness
size = self.image.get_size()
calc = thickness/100
p_width, p_height = size[0], size[1]
width, height = size[0]*calc, size[1]*calc
self.image = self.image.convert_alpha()
center_x, center_y = (p_width//2)-(width//2), (p_height//2)-(height//2)
pg.draw.rect(self.image, (0, 0, 0, 0), (center_x, center_y, width, height))
pg.init()
window = pg.display.set_mode((300, 300))
clock = pg.time.Clock()
sprite = Rectangle()
sprite.set_colour((255, 0, 0, 255))
sprite.set_outline(50)
group = pg.sprite.Group(sprite)
colorVal = 0
colorAdd = 5
run = True
while run:
clock.tick(60)
for event in pg.event.get():
if event.type == pg.QUIT:
run = False
sprite.set_colour((min(colorVal, 255), max(0, min(511-colorVal, 255)), 0, 255))
colorVal += colorAdd
if colorVal <= 0 or colorVal >= 511:
colorAdd *= -1
window.fill(0)
group.draw(window)
pg.display.flip()
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