from PIL import Image from .helper import assert_image_equal, assert_image_similar, hopper def rotate(im, mode, angle, center=None, translate=None): out = im.rotate(angle, center=center, translate=translate) assert out.mode == mode assert out.size == im.size # default rotate clips output out = im.rotate(angle, center=center, translate=translate, expand=1) assert out.mode == mode if angle % 180 == 0: assert out.size == im.size elif im.size == (0, 0): assert out.size == im.size else: assert out.size != im.size def test_mode(): for mode in ("1", "P", "L", "RGB", "I", "F"): im = hopper(mode) rotate(im, mode, 45) def test_angle(): for angle in (0, 90, 180, 270): with Image.open("Tests/images/test-card.png") as im: rotate(im, im.mode, angle) def test_zero(): for angle in (0, 45, 90, 180, 270): im = Image.new("RGB", (0, 0)) rotate(im, im.mode, angle) def test_resample(): # Target image creation, inspected by eye. # >>> im = Image.open('Tests/images/hopper.ppm') # >>> im = im.rotate(45, resample=Image.BICUBIC, expand=True) # >>> im.save('Tests/images/hopper_45.png') with Image.open("Tests/images/hopper_45.png") as target: for (resample, epsilon) in ( (Image.NEAREST, 10), (Image.BILINEAR, 5), (Image.BICUBIC, 0), ): im = hopper() im = im.rotate(45, resample=resample, expand=True) assert_image_similar(im, target, epsilon) def test_center_0(): im = hopper() im = im.rotate(45, center=(0, 0), resample=Image.BICUBIC) with Image.open("Tests/images/hopper_45.png") as target: target_origin = target.size[1] / 2 target = target.crop((0, target_origin, 128, target_origin + 128)) assert_image_similar(im, target, 15) def test_center_14(): im = hopper() im = im.rotate(45, center=(14, 14), resample=Image.BICUBIC) with Image.open("Tests/images/hopper_45.png") as target: target_origin = target.size[1] / 2 - 14 target = target.crop((6, target_origin, 128 + 6, target_origin + 128)) assert_image_similar(im, target, 10) def test_translate(): im = hopper() with Image.open("Tests/images/hopper_45.png") as target: target_origin = (target.size[1] / 2 - 64) - 5 target = target.crop( (target_origin, target_origin, target_origin + 128, target_origin + 128) ) im = im.rotate(45, translate=(5, 5), resample=Image.BICUBIC) assert_image_similar(im, target, 1) def test_fastpath_center(): # if the center is -1,-1 and we rotate by 90<=x<=270 the # resulting image should be black for angle in (90, 180, 270): im = hopper().rotate(angle, center=(-1, -1)) assert_image_equal(im, Image.new("RGB", im.size, "black")) def test_fastpath_translate(): # if we post-translate by -128 # resulting image should be black for angle in (0, 90, 180, 270): im = hopper().rotate(angle, translate=(-128, -128)) assert_image_equal(im, Image.new("RGB", im.size, "black")) def test_center(): im = hopper() rotate(im, im.mode, 45, center=(0, 0)) rotate(im, im.mode, 45, translate=(im.size[0] / 2, 0)) rotate(im, im.mode, 45, center=(0, 0), translate=(im.size[0] / 2, 0)) def test_rotate_no_fill(): im = Image.new("RGB", (100, 100), "green") im = im.rotate(45) with Image.open("Tests/images/rotate_45_no_fill.png") as target: assert_image_equal(im, target) def test_rotate_with_fill(): im = Image.new("RGB", (100, 100), "green") im = im.rotate(45, fillcolor="white") with Image.open("Tests/images/rotate_45_with_fill.png") as target: assert_image_equal(im, target) def test_alpha_rotate_no_fill(): # Alpha images are handled differently internally im = Image.new("RGBA", (10, 10), "green") im = im.rotate(45, expand=1) corner = im.getpixel((0, 0)) assert corner == (0, 0, 0, 0) def test_alpha_rotate_with_fill(): # Alpha images are handled differently internally im = Image.new("RGBA", (10, 10), "green") im = im.rotate(45, expand=1, fillcolor=(255, 0, 0, 255)) corner = im.getpixel((0, 0)) assert corner == (255, 0, 0, 255)