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| View Original: | Gray configuration.svg (367x374) | |||
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| Keywords: Gray configuration.svg The Gray configuration 27 points and 27 lines meeting three lines to a point and three points to a line drawn as a perspective view of a three-dimensional 3x3x3 grid Own 2008-04-12 David Eppstein Source code This image was created as a pdf file by the following Python code then rescaled and converted to SVG <source lang python > from pyx import canvas path color from math import sqrt tan asin pov -20 6 5 x y z 2 1 0 radius 0 05 scale 10 0 vertexColor color rgb red edgeColor color rgb black def distance p q return sqrt sum pi-qi 2 for i in x y z def perspective loc dz locz-povz return locx-povx scale/dz locy-povy scale/dz def vertex p lx ly perspective p prad scale 1 1 tan asin radius/ distance p pov c fill path circle lx ly prad vertexColor def edge p q lx1 ly1 perspective p lx2 ly2 perspective q c stroke path line lx1 ly1 lx2 ly2 edgeColor c canvas canvas for i in range 3 for j in range 3 edge i j 0 i j 2 edge i 0 j i 2 j edge 0 i j 2 i j for i in range 3 for j in range 3 for k in range 3 vertex i j k c writePDFfile Gray configuration </source> Files by User David Eppstein from en wikipedia Gray graph Projective geometry Lines and points Images with Python source code | ||||
