我正在尝试创建一种方法来基本上擦除表面上的绘图。我的功能适用于包含 png 的表面,但是当我使用相同的方法删除 pygame.draw.lines() 绘制的表面时,它不会被擦除。
这两个表面之间的主要区别是一个是透明的,另一个是不透明的。我想我可能不完全理解 pygames 透明表面是如何工作的。
无法使用 undraw():
class MovementComponent(AbstactComponent):
def __init__(self) -> None:
super().__init__()
game_surfaces = GameSurfaces() #singleton class that rerenders all of the surfaces in order
self.movement_surface = game_surfaces.movement_surface
self.path_surface = pg.Surface(self.movement_surface.get_size(), pg.SRCALPHA)
self.path_surface.set_alpha(150)
def draw_movement(self):
if len(self.queue()) >= 2:
tile_centers = []
for tile in self.queue():
tile_centers.append(tile.center_pixel)
pg.draw.lines(
self.path_surface,
self.character.color,
False, tile_centers, 3
)
self.movement_surface.blit(self.path_surface, (0,0))
def undraw_movement(self):
empty = pg.Color(0,0,0,0)
self.path_surface.fill(empty)
self.movement_surface.blit(self.path_surface, (0,0))
另一个组件中的工作取消绘制:
class SpriteComponent(AbstactComponent):
NORMAL_SIZE = (55,55)
def __init__(self, image: pg.image):
surfaces = GameSurfaces()
self.char_surface = surfaces.character_surface
self.pixel_pos: (int,int) = None
self.standard_image = pg.transform.scale(image, self.NORMAL_SIZE)
self.empty = pg.Color(0,0,0,0)
def draw(self, pixel_pos: (int, int)):
self.pixel_pos = pixel_pos
top_left_pixel = self.get_topleft_pos(pixel_pos)
self.char_surface.blit(self.standard_image, top_left_pixel)
def undraw(self, pixel_pos: (int, int)=None):
pixel_pos = pixel_pos if pixel_pos else self.pixel_pos
top_left_pixel = self.get_topleft_pos(self.pixel_pos)
rect_to_clear = pg.Rect(top_left_pixel, self.NORMAL_SIZE)
self.char_surface.fill(self.empty, rect_to_clear)
透明的
Surface
与背景混合。然而,删除时,您希望完全覆盖背景。因此,您必须再次使 Surface
暂时不透明才能删除:
class MovementComponent(AbstactComponent):
# [...]
def undraw_movement(self):
empty = pg.Color(0,0,0,0)
self.path_surface.fill(empty)
self.path_surface.set_alpha(None)
self.movement_surface.blit(self.path_surface, (0,0))
self.path_surface.set_alpha(150)