def __call__(self, maze):
"""
Encode current maze into one frame and return the encoded data.
Note the graphics control block is not added here.
"""
# the image descriptor
if maze.frame_box is not None:
left, top, right, bottom = maze.frame_box
else:
left, top, right, bottom = 0, 0, maze.width - 1, maze.height - 1
width = right - left + 1
height = bottom - top + 1
descriptor = encoder.image_descriptor(
maze.scaling * left + maze.translation[0],
maze.scaling * top + maze.translation[1], maze.scaling * width,
maze.scaling * height)
pixels = [
self.colormap[maze.get_cell(
(x // maze.scaling + left, y // maze.scaling + top))]
for y in range(height * maze.scaling)
for x in range(width * maze.scaling)
]
# the compressed image data of this frame
data = self.compress(pixels)
# clear `num_changes` and `frame_box`
maze.reset()
return descriptor + data
def __call__(self, pcanvas):
"""
Encode current PixelCanvas into one frame and return the encoded data.
Note the graphics control block is not added here.
"""
# the image descriptor
if pcanvas.frame_box is not None:
left, top, right, bottom = pcanvas.frame_box
else:
left, top, right, bottom = 0, 0, pcanvas.width - 1, pcanvas.height - 1
width = right - left + 1
height = bottom - top + 1
descriptor = encoder.image_descriptor(pcanvas.scaling * left + pcanvas.translation[0],
pcanvas.scaling * top + pcanvas.translation[1],
pcanvas.scaling * width,
pcanvas.scaling * height)
pixels = [self.colormap[pcanvas.get_pixel(x // pcanvas.scaling + left,
y // pcanvas.scaling + top)]
for y in range(height * pcanvas.scaling)
for x in range(width * pcanvas.scaling)]
# the compressed image data of this frame
data = self.compress(pixels)
# clear `num_changes` and `frame_box`
pcanvas.reset()
return descriptor + data