Curved Polys (update)

Clipper does not make it feasible to pass a polygon through and get the related points back, even if you are only doing a boolean operation. All points get scrambled/re-written. So maintaining zones with arcs will require recognizing/converting arcs post-clipper.

Todo:

• Read/write file formats
• Plot arcs as part of polygons
• [x] Convert clipper results to lines/arcs (see SHAPE_LINE_CHAIN::DetectArcs) (Does not work)
• [ ] Integrate DetectArcs to Boolean calculations
• Use Clipper Z value to detect arcs post clipper in boolean operations
• Add unit tests using Simplify to verify that the arcs are not lost and the area not modified
• [ ] Rewrite SHAPE_POLY_SET::Fillet so it creates true arc segments instead of just piecewise linear segments (Not needed as not using in Zone fills)

Stretch tasks:

• [ ] Detect intersections between arcs post Clipper and amend the intersection point (Not needed as not using in Zone fills)