def scale(self, image, geometry, upscale, crop):
"""
Given an image, scales the image down (or up, if ``upscale`` equates
to a boolean ``True``).
:param Image image: This is your engine's ``Image`` object. For
PIL it's PIL.Image.
:param tuple geometry: Geometry of the image in the format of (x,y).
:returns: The scaled image. The returned type depends on your
choice of Engine.
"""
x_image, y_image = map(float, self.get_image_size(image))
# Mod by ksperkins, 2-10-2012
# Allow only x or y geometry and scale other to maintain aspect
# Unspecified value indicated by 0 -- if both 0 return original
# If specified value in geometry is larger than image value and
# upscale not specified then return original.
# It's irrational to use this feature and have crop be set, thus
# crop is temporarily repurposed to support upscaling with less code
if geometry[0] <= 0 or geometry[1] <= 0:
if geometry[0] <= 0 and geometry[1] <= 0:
return image
elif geometry[0] <= 0:
if geometry[1] > y_image:
# Image potentially needs upscaling, however the smaller
# factor will just be 1, so we need to force selecting
# the larger factor if upscaling is True. The following
# line does just that.
crop = upscale
geometry = (x_image, geometry[1])
else:
if geometry[0] > x_image:
crop = upscale # See comment above
geometry = (geometry[0], y_image)
# End Mod
# Calculate scaling factor.
factors = (geometry[0] / x_image, geometry[1] / y_image)
factor = max(factors) if crop else min(factors)
if factor < 1 or upscale:
width = toint(x_image * factor)
height = toint(y_image * factor)
image = self._scale(image, width, height)
return image
def scale(self, image, geometry, upscale, crop):
"""
Given an image, scales the image down (or up, if ``upscale`` equates
to a boolean ``True``).
:param Image image: This is your engine's ``Image`` object. For
PIL it's PIL.Image.
:param tuple geometry: Geometry of the image in the format of (x,y).
:returns: The scaled image. The returned type depends on your
choice of Engine.
"""
x_image, y_image = map(float, self.get_image_size(image))
# Calculate scaling factor.
factors = (geometry[0] / x_image, geometry[1] / y_image)
factor = max(factors) if crop else min(factors)
if factor < 1 or upscale:
width = toint(x_image * factor)
height = toint(y_image * factor)
image = self._scale(image, width, height)
return image
def scale(self, image, geometry, upscale, crop):
"""
Given an image, scales the image down (or up, if ``upscale`` equates
to a boolean ``True``).
:param Image image: This is your engine's ``Image`` object. For
PIL it's PIL.Image.
:param tuple geometry: Geometry of the image in the format of (x,y).
:returns: The scaled image. The returned type depends on your
choice of Engine.
"""
x_image, y_image = map(float, self.get_image_size(image))
# Calculate scaling factor.
factors = (geometry[0] / x_image, geometry[1] / y_image)
factor = max(factors) if crop else min(factors)
if factor < 1 or upscale:
width = toint(x_image * factor)
height = toint(y_image * factor)
image = self._scale(image, width, height)
return image