X-border

by NightElfik
Short link: http://malsys.cz/g/pL38xSMI
X-border

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By William McWorter

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Source code

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lsystem XBorder {
 
set iterations = 3;
set symbols axiom =
X Y X Y X Y X +
X Y X Y X Y X +
X Y X Y X Y X +
X Y X Y X Y X;
 
interpret F as DrawForward(5);
interpret + as TurnLeft(90);
interpret - as TurnLeft(-90);
 
rewrite F to nothing;
rewrite X to F X + F X + F X F Y - F Y -;
rewrite Y to + F X + F X F Y - F Y - F Y;
}
 
process all with SvgRenderer;