Original file (SVG file, nominally 540 × 531 pixels, file size: 6 KB)
This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
Source code
This image was created as a pdf file by the following Python code, then recolored in Adobe Illustrator and converted to SVG.
from pyx import canvas , path , color
from math import *
rot = [ e ** ( pi * 0.4 j * i ) for i in range ( 5 )]
def orient ( p , q ):
return p . real * q . imag - p . imag * q . real
def testx ( x ):
p = rot [ 1 ] . real + 1 j * x
return orient ( p - 1 , p * rot [ 3 ] - 1 )
lo , hi = 3 , 4
while hi - lo > 1e-8 :
mid = ( lo + hi ) / 2.0
if testx ( mid ) < 0 : hi = mid
else : lo = mid
c = canvas . canvas ()
scale = 2.0
def edge ( p , q ):
c . stroke ( path . line ( p . real * scale , p . imag * scale , q . real * scale , q . imag * scale ),
[ color . rgb . black ])
def point ( p ):
c . fill ( path . circle ( p . real * scale , p . imag * scale , 0.08 * scale ),[ color . rgb . red ])
for i in range ( 5 ):
p2 = 1 * rot [ i - 4 ]
p3 = ( rot [ 1 ] . real + 1 j * mid ) * rot [ i ]
p4 = p3 * rot [ 2 ]
edge ( p3 , p4 )
edge ( p4 , p2 )
for i in range ( 5 ):
point ( 1 * rot [ i ])
point (( rot [ 1 ] . real + 1 j * mid ) * rot [ i ])
c . writePDFfile ( "Non-Desargues configuration" )
Licensing
Public domain Public domain false false
I, the copyright holder of this work, release this work into the public domain . This applies worldwide.In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose , without any conditions, unless such conditions are required by law.
English Add a one-line explanation of what this file represents
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time Thumbnail Dimensions User Comment
current 07:33, 9 April 2008 540 × 531 (6 KB) wikimediacommons>David Eppstein Recolor more boldly
File usage
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