iwmlib/lib/stylus/README.txt

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https://mattdesl.svbtle.com/drawing-lines-is-hard
http://perfectionkills.com/exploring-canvas-drawing-techniques/
https://github.com/mattdesl/polyline-normals
var path = [ [0, 122], [0, 190], [90, 190] ]
//get the normals as a closed loop
var normals = getNormals(path, true)