具有透明背景的精灵的像素完美碰撞检测

具有透明背景的精灵的像素完美碰撞检测

使用该

pygame.mask.from_surface

函数为您的精灵赋予

self.mask

属性。

self.mask = pygame.mask.from_surface(self.image)

然后，您可以将

pygame.sprite.collide_mask

回调函数传递给sprite碰撞函数之一，例如

pygame.sprite.spritecollide

，碰撞检测将是完美的像素。

pygame.sprite.spritecollide(self.player, self.enemies, False, pygame.sprite.collide_mask)

这是一个完整的示例（当两个精灵碰撞时，标题会更改）：

import pygame as pgclass Player(pg.sprite.Sprite):    def __init__(self, pos):        super(Player, self).__init__()        self.image = pg.Surface((120, 120), pg.SRCALPHA)        pg.draw.polygon(self.image, (0, 100, 240), [(60, 0), (120, 120), (0, 120)])        self.rect = self.image.get_rect(center=pos)        self.mask = pg.mask.from_surface(self.image)class Enemy(pg.sprite.Sprite):    def __init__(self, pos):        super(Enemy, self).__init__()        self.image = pg.Surface((120, 120), pg.SRCALPHA)        pg.draw.circle(self.image, (240, 100, 0), (60, 60), 60)        self.rect = self.image.get_rect(center=pos)        self.mask = pg.mask.from_surface(self.image)class Game:    def __init__(self):        self.screen = pg.display.set_mode((640, 480))        self.player = Player((20, 20))        self.enemies = pg.sprite.Group(Enemy((320, 240)))        self.all_sprites = pg.sprite.Group(self.player, self.enemies)        self.done = False        self.clock = pg.time.Clock()    def run(self):        while not self.done: self.event_loop() self.update() self.draw() pg.display.flip() self.clock.tick(60)    def event_loop(self):        for event in pg.event.get(): if event.type == pg.QUIT:     self.done = True elif event.type == pg.MOUSEMOTION:     self.player.rect.center = event.pos    def update(self):        # Check if the player collides with an enemy sprite. The        # `pygame.sprite.collide_mask` callback uses the `mask`        # attributes of the sprites for the collision detection.        if pg.sprite.spritecollide(self.player, self.enemies, False, pg.sprite.collide_mask): pg.display.set_caption('collision')        else: pg.display.set_caption('no collision')    def draw(self):        self.screen.fill((30, 30, 30))        self.all_sprites.draw(self.screen)if __name__ == '__main__':    pg.init()    game = Game()    game.run()    pg.quit()