https://github.com/amirk1711/polygon-offsetting
https://github.com/kalluwa/PolyLineOffsetSample
https://github.com/Yidadaa/Offset-Polygen
https://github.com/w8r/polygon-offset
https://github.com/bbecquet/Leaflet.PolylineOffset
https://github.com/jbuckmccready/CavalierContours
An offset algorithm for polyline curves Xu-ZhengLiu2007a.pdf
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