What did you do?

I drew a filled quadrilateral.

What did you expect to happen?

The output would be a contiguous quadrilateral.

What actually happened?

The output was discontiguous.

What are your OS, Python and Pillow versions?

• OS: macOS 10.14.6
• Python: Python 3.7.4 (default, Jul 11 2019, 01:08:00) [Clang 10.0.1 (clang-1001.0.46.4)] on darwin
• Pillow: 6.1.0

from PIL import Image, ImageDraw
img = Image.new("1", (128, 128))
coords = [(29.0, 74.0), (62.0, 57.0), (99.0, 54.0), (66.0, 71.0)]
drawer = ImageDraw.Draw(img)
drawer.polygon(coords,1,1)
img.show()