Posted by dxli on Jul 09, 2014; 1:38am
URL: https://forum.librecad.org/Measurement-input-to-CAD-tp5710133p5710138.html

I think length works for spline in LibreCAD, by approximating spline with line segments.

Need to figure out an algorithm for arbitrary contour. Current polygon area is by summation of:

( - y dx + x dy)/2

we can keep this for straight line edges, but add analytical solution for arc/elliptical arcs. This should be after some robust contour detection.