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Editorial Team
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Asked: 2026-05-24T20:00:44+00:00

I am trying to create a segmented arc using PIL and Imagedraw. The arc

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I am trying to create a segmented arc using PIL and Imagedraw. The arc function allows me to draw an arc easily, but it is just a line. I need to be able to place an arc of given radius and thickness(ID to OD), but AI cannot find any type of thickness or width setting. Is there a way to do this? If not, is there some other way to do this using PIL?

Snippet:

import Image
import ImageDraw

conv = 0.1
ID = 15
OD = 20
image = Image.new('1',(int(ceil(OD/conv))+2,int(ceil(OD/conv))+1), 1)
draw = ImageDraw.Draw(image)
diam = OD-ID
box=(1, 1, int(ceil(diam/conv)), int(ceil(diam/conv))) #create bounding box
draw.arc(box, 0, 90, 0) #draw circle in black
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1 Answer

  1. Editorial Team

    A trick I found that can be pulled is to make a white circle inside the black circle. You can use the pieslice method to break it up as needed. The rendering is sequential, so you just have to get the ordering correct. The hard part is getting the positioning correct, due to Imagedraw’s use of bounding boxes as opposed to center and radius coordinates. You have to make sure that the centers of everything end up exactly on each other.

    THIS SOLUTION IS GOOD ONLY IN A LIMITED CASE, see comment.

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