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)
def test_chained_translate_rotate(self):
a = AffineTransform()
# translate by (3, 4). rotate by 90 degrees
t = a.translate(3, 4).rotate(90)
self.assertEqual(t.matrix, (0, -1, 0, 1, 0, 0, 4, -3, 1))
def test_translate(self):
a = AffineTransform()
t = a.translate(3, 4)
self.assertEqual(t.matrix, (1, 0, 0, 0, 1, 0, 3, 4, 1))
self.assertEqual(t.translate(3, 4).matrix, (1, 0, 0, 0, 1, 0, 6, 8, 1))
def test_chained_translate_rotate_translate(self):
a = AffineTransform()
# translate by (3, 4). rotate by 90 degrees. then translate back.
t = a.translate(3, 4).rotate(90).translate(-3, -4)
self.assertEqual(t.matrix, (0, -1, 0, 1, 0, 0, 1, -7, 1))
def test_chained_translate_rotate_translate(self):
a = AffineTransform()
# translate by (3, 4). rotate by 90 degrees. then translate back.
t = a.translate(3, 4).rotate(90).translate(-3, -4)
self.assertEqual(t.matrix, (0, -1, 0, 1, 0, 0, 1, -7, 1))
def test_chained_translate_rotate(self):
a = AffineTransform()
# translate by (3, 4). rotate by 90 degrees
t = a.translate(3, 4).rotate(90)
self.assertEqual(t.matrix, (0, -1, 0, 1, 0, 0, 4, -3, 1))
def test_translate(self):
a = AffineTransform()
t = a.translate(3, 4)
self.assertEqual(t.matrix, (1, 0, 0, 0, 1, 0, 3, 4, 1))
self.assertEqual(t.translate(3, 4).matrix, (1, 0, 0, 0, 1, 0, 6, 8, 1))