def enqueue_shadow(self, screen):
"""Add it's own shadow to the list of shadows that the ground have to
paint.
"""
min_depth = int(self.pos[2])-1
tile_y, tile_x = int(self.pos[0]), int(self.pos[1])
if (self.pos[0] < 0.0 or self.pos[0] >= len(Ground.pattern[0]) or
self.pos[1] < 0.0 or self.pos[1] >= len(Ground.pattern[0][0])):
return
while min_depth < len(Ground.pattern):
if not Ground.pattern[min_depth][tile_x][tile_y]:
min_depth += 1
continue
shadow_pos = self.pos[:]
shadow_pos[2] = len(Ground.pattern) - min_depth + 0.3
# The shadow behaves different if there is a slope.
if Ground.pattern[min_depth][tile_x][tile_y]==2:
shadow_pos[2] += self.pos[0]-tile_y
elif Ground.pattern[min_depth][tile_x][tile_y]==3:
shadow_pos[2] += self.pos[1]-tile_x
elif Ground.pattern[min_depth][tile_x][tile_y]==4:
shadow_pos[2] -= self.pos[0]-tile_y-1
elif Ground.pattern[min_depth][tile_x][tile_y]==5:
shadow_pos[2] -= self.pos[1]-tile_x-1
Ground.add_shadow(screen, shadow_pos, min_depth, self.radius)
min_depth += 1
