App::MathImage::LinesTree -- tree line drawing
This is a special kind of "values" which draws lines between the points of the path in a tree structure.
This suits things like Math::PlanePath::PythagoreanTree, but may be a big mess for non-tree related paths.
Copyright 2010, 2011, 2012, 2013, 2014, 2019 Kevin Ryde
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