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Added tests for lines with 1px slope

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This tests are designed to guarantee that the wide lines behave exactly
like normal lines drawn with the Bresenham's algorithm.
This tests are somewhat subjective since this is non-defined behavior,
but I think that mimic the Bresenham's algorithm is reliable enough.

Currently the horizontal version of this test **fail**.
This commit is contained in:
Terseus 2014-04-09 19:12:03 +02:00
parent 4b7236f460
commit b987d90568
3 changed files with 10 additions and 0 deletions
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Tests/images/imagedraw/line_horizontal_slope1px_w2px.png Normal file
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Tests/test_imagedraw.py
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@ -92,6 +92,11 @@ def test_line_horizontal():
img, draw = create_base_image_draw((200, 110)) img, draw = create_base_image_draw((200, 110))
draw.line((5, 55, 195, 55), BLACK, 101) draw.line((5, 55, 195, 55), BLACK, 101)
assert_image_equal(img, expected, 'line straigth horizontal 101px wide failed') assert_image_equal(img, expected, 'line straigth horizontal 101px wide failed')
expected = Image.open(os.path.join(IMAGES_PATH, 'line_horizontal_slope1px_w2px.png'))
expected.load()
img, draw = create_base_image_draw((20, 20))
draw.line((5, 5, 14, 6), BLACK, 2)
assert_image_equal(img, expected, 'line horizontal 1px slope 2px wide failed')
def test_line_vertical(): def test_line_vertical():
@ -118,6 +123,11 @@ def test_line_vertical():
img, draw = create_base_image_draw((110, 200)) img, draw = create_base_image_draw((110, 200))
draw.line((55, 5, 55, 195), BLACK, 101) draw.line((55, 5, 55, 195), BLACK, 101)
assert_image_equal(img, expected, 'line straigth vertical 101px wide failed') assert_image_equal(img, expected, 'line straigth vertical 101px wide failed')
expected = Image.open(os.path.join(IMAGES_PATH, 'line_vertical_slope1px_w2px.png'))
expected.load()
img, draw = create_base_image_draw((20, 20))
draw.line((5, 5, 6, 14), BLACK, 2)
assert_image_equal(img, expected, 'line vertical 1px slope 2px wide failed')
def test_line_oblique_45(): def test_line_oblique_45():