def test_rotate(self):
a = AffineTransform()
self.assertEqual(a.rotate(0), a)
self.assertEqual(a.rotate(360), a)
self.assertEqual(a.rotate(90), a.rotate(270, clockwise=True))
self.assertEqual(a.rotate(90), AffineTransform((0, -1, 0, 1, 0, 0, 0, 0, 1)))
def test_rotate(self):
a = AffineTransform()
self.assertEqual(a.rotate(0), a)
self.assertEqual(a.rotate(360), a)
self.assertEqual(a.rotate(90), a.rotate(270, clockwise=True))
self.assertEqual(a.rotate(90),
AffineTransform((0, -1, 0, 1, 0, 0, 0, 0, 1)))
def rotate(self,
degrees,
clockwise=False,
resample_algorithm=nearest,
resize_canvas=True):
"""
Returns the image obtained by rotating this image by the
given number of degrees.
Anticlockwise unless clockwise=True is given.
"""
# translate to the origin first, then rotate, then translate back
transform = AffineTransform()
transform = transform.translate(self.width * -0.5, self.height * -0.5)
transform = transform.rotate(degrees, clockwise=clockwise)
width, height = self.width, self.height
if resize_canvas:
# determine new width
width, height = get_transformed_dimensions(transform,
(0, 0, width, height))
transform = transform.translate(width * 0.5, height * 0.5)
pixels = resample_algorithm.affine(self,
transform,
resize_canvas=resize_canvas)
return self._copy(pixels)
def rotate(self, degrees, clockwise=False, resample_algorithm=nearest, resize_canvas=True):
"""
Returns the image obtained by rotating this image by the
given number of degrees.
Anticlockwise unless clockwise=True is given.
"""
# translate to the origin first, then rotate, then translate back
transform = AffineTransform()
transform = transform.translate(self.width * -0.5, self.height * -0.5)
transform = transform.rotate(degrees, clockwise=clockwise)
width, height = self.width, self.height
if resize_canvas:
# determine new width
width, height = get_transformed_dimensions(transform, (0, 0, width, height))
transform = transform.translate(width * 0.5, height * 0.5)
pixels = resample_algorithm.affine(self, transform, resize_canvas=resize_canvas)
return self._copy(pixels)
