Gabriel Wicke 6b3815a766
[path] Implement Ramer-Douglas-Peucker line simplification ...
Implement an iterative version of the Ramer-Douglas-Peucker line
simplification algorithm
(https://en.wikipedia.org/wiki/Ramer%E2%80%93Douglas%E2%80%93Peucker_algorithm ),
which reduces line complexity to a limited linear deviation from the
original polyline. The ability to reason about linear deflection is the
key improvement over the previous linear implementation.
Worst case complexity is O(n^2), but expected complexity for typical
cases is O(n log n). A potentially faster alternative would be to call
out to libclipper, treating the line as a closed polygon. However, in
practice, performance of this implementation seems good enough. A
complex 3d surface operation optimizes in a few seconds, and reduces
output gcode size from about 220MB with the previous implementation to
10MB.
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