I've added Chandan's scaling funtion to util
Called by
scaled = util.scale_rectangle_to_max((2304, 3072), (100, 200))
def scale_rectangle_to_max(size, max_size):
'''
returns a scaled rectangle size fitting the size to max_size
this can be used to scale images for viewing in a browser and
retaining the aspect ratio
'''
try:
scaled_width = max_size[0]
scaled_height = max_size[1]
# if actual image aspect ratio > scaled image aspect ratio then
scale height
if float(size[0]) / size[1] > float(scaled_width) / scaled_height:
scaled_height = scaled_width * size[1] / size[0]
else: # else scale width
scaled_width = scaled_height * size[0] / size[1]
except ZeroDivisionError:
pass
return (scaled_width, scaled_height)
This can be used to scale an image when the full image is opened in the
browser, keeping the aspect ratio.
May be this should really by kaa.imlib2
Duncan
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