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----
-description: Generating geometric line art
-created: 2024-05-12
----
-
-![Envelope](Envelope.png)
-
-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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