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---
description: Generating geometric line art
created: 2024-05-12
---
Needed a clean picture of [Envelope (mathematics)](https://en.wikipedia.org/wiki/Envelope_%28mathematics%29),
for PCB silk screen art.
I used [Python Pillow](https://python-pillow.org/)
```
pip install pillow~=10.3
```
```python
from PIL import Image, ImageDraw
# https://en.wikipedia.org/wiki/Envelope_%28mathematics%29
dim = 200 # Image dimensions (pixels)
skip = 10 # Only draw a line every X pixels
width = 1 # Line width
color = "white"
with Image.new(mode = "RGB", size = (dim, dim)) as im: # mode="RGBA" for transparent background
draw = ImageDraw.Draw(im)
for i in range(dim):
if i % skip:
continue
rev = dim - i
draw.line([(0, i), (i, dim)], fill=color, width=width)
im.show() # im.save("/tmp/Envelope.png")
```
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