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Merge pull request #4014 from radarhere/arc

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Fixed arc drawing bug for a non-whole number of degrees
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Hugo van Kemenade 2019-09-05 22:52:05 +03:00 committed by GitHub
commit bd2d7cb247
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3 changed files with 13 additions and 1 deletions
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Tests/images/imagedraw_arc_width_non_whole_angle.png Normal file
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12
Tests/test_imagedraw.py
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@ -140,6 +140,18 @@ class TestImageDraw(PillowTestCase):
# Assert # Assert
self.assert_image_similar(im, Image.open(expected), 1) self.assert_image_similar(im, Image.open(expected), 1)
def test_arc_width_non_whole_angle(self):
# Arrange
im = Image.new("RGB", (W, H))
draw = ImageDraw.Draw(im)
expected = "Tests/images/imagedraw_arc_width_non_whole_angle.png"
# Act
draw.arc(BBOX1, 10, 259.5, width=5)
# Assert
self.assert_image_similar(im, Image.open(expected), 1)
def test_bitmap(self): def test_bitmap(self):
# Arrange # Arrange
small = Image.open("Tests/images/pil123rgba.png").resize((50, 50)) small = Image.open("Tests/images/pil123rgba.png").resize((50, 50))

2
src/libImaging/Draw.c
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@ -834,7 +834,7 @@ ellipse(Imaging im, int x0, int y0, int x1, int y1,
// Build edge list // Build edge list
// malloc check UNDONE, FLOAT? // malloc check UNDONE, FLOAT?
maxEdgeCount = end - start; maxEdgeCount = ceil(end - start);
if (inner) { if (inner) {
maxEdgeCount *= 2; maxEdgeCount *= 2;
} }