File:Stella octangula circle packing.svg
Jump to navigation
Jump to search
Original file (SVG file, nominally 361 × 220 pixels, file size: 471 bytes)
Summary
| Description |
English: Four mutually-tangent circles (black) and another four mutually-tangent circles that pass perpendicularly through the same points of tangency (black). When lifted to a sphere by a conformal azimuthal projection, these circles lie on the face planes of a stellated octahedron. |
| Date | |
| Source | Own work |
| Author | David Eppstein |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
 
|
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
|
Source code
from SVG import SVG,colors
import sys
rad = 100 # radius of large two circles
margin = 10 # extra space around boundary of image
height = 2*(rad+margin)
width = (2+2**0.5)*rad + 2*margin
bbox = width + 1j*height
svg = SVG(bbox,sys.stdout)
x1 = 2**0.5/2*rad
x2 = rad - x1
y2 = abs(x1-x2)
scale = x2/(x1+rad)
circles = [
(bbox/2 - x1, rad),
(bbox/2 - x2 + 1j*y2, y2),
(bbox/2 - x2 - 1j*y2, y2),
(bbox/2 + x1*scale, rad*scale)
]
svg.group(fill="none")
svg.group(stroke=colors.black)
for (c,r) in circles:
svg.circle(c,r)
svg.ungroup()
svg.group(stroke=colors.blue)
for (c,r) in circles:
svg.circle(bbox-c,r)
svg.ungroup()
svg.ungroup()
svg.close()
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:28, 2 July 2026 | | 361 × 220 (471 bytes) | wikimediacommons>David Eppstein | Uploaded own work with UploadWizard |
File usage
There are no pages that use this file.
