def get_sprite_bbox(coord, spritesheet, border_color, border_thickness=1):
""" Return the bounding box of the sprite at <coord> in <spritesheet> with <border_color>
is spritesheet background color. <border_thickness> is the size of the border surrounding the sprite """
x, y = coord
selected_pixel = spritesheet.getpixel((x, y))
if selected_pixel == border_color:
return None
# get bounding box surrounding selected pixel
bbox = BoundingBox(x - 1, y - 1, x + 2, y + 2)
sprite = crop(spritesheet, bbox)
# since the option can be 0, we need at least 1 pixel thickness to detect border, after that we subtract the result
border_thickness += 1
while not have_all_border(sprite, border_color, border_thickness):
if bbox.left <= 0 or bbox.top <= 0 or bbox.right > spritesheet.width or bbox.bottom > spritesheet.height:
return BoundingBox.empty_bbox()
while not have_top_border(sprite, border_color,
border_thickness) and bbox.top > 0:
bbox.top -= 1
sprite = crop(spritesheet, bbox)
while not have_bottom_border(
sprite, border_color,
border_thickness) and bbox.bottom <= spritesheet.height:
bbox.bottom += 1
sprite = crop(spritesheet, bbox)
while not have_left_border(sprite, border_color,
border_thickness) and bbox.left > 0:
bbox.left -= 1
sprite = crop(spritesheet, bbox)
while not have_right_border(
sprite, border_color,
border_thickness) and bbox.right <= spritesheet.width:
bbox.right += 1
sprite = crop(spritesheet, bbox)
# after have_all_border() return False we have a bounding box that has extra one pixel border
bbox = BoundingBox(bbox.left + 1, bbox.top + 1, bbox.right - 1,
bbox.bottom - 1)
if debugging:
print(str(bbox))
# sprite.show()
return bbox
def _get_bbox(image):
bbox = image.getbbox()
if bbox is None:
return BoundingBox.empty_bbox()
return BoundingBox(bbox[0], bbox[1], bbox[2], bbox[3])