4 Commits

This Branch

This Branch

All Branches

Author	SHA1	Message	Date
Mike Sheldrake	73aae07e74	842, 847 slightly enlarge a clip polygon to counteract integer truncation ... Geomery in referenced issues triggered Clipper problems, but also pointed to a situation where integer truncation (as coordinates pass into Clipper) might be shrinking a clip polygon in a way that leaves degenerate or unwanted thin clip results. Growing the clip polygon by 2 is expected to overcome any issues caused by truncation of floats.	2013-01-11 10:15:42 -08:00
Mike Sheldrake	4b91496edd	use remove_coinciding_points before convex_hull ... convex_hull returns polygons with sharp concaves sometimes when duplicate points are present	2012-09-27 06:47:38 -07:00
Mike Sheldrake	5ee68aa916	$parallel_degrees_limit decreased, 3 to 0.1, #704 ... Geometry::lines_parallel() test used for collapsing adjacent colinear lines was too loose in testing for colinearity, because of this constant setting. Gradualy curving and high-res outer perimiters would over-simplify into straight lines.	2012-09-27 06:14:54 -07:00
Mike Sheldrake	2bcac88683	Increase scale factor for Clipper::offset ... A default scale of 1 was being calculated most of the time. That's too low to avoid artifacts from offsetting concave curves. Setting scale to a default of 100000 eliminates artifacts in the test cases in issues #700, #702 and #703. There is a risk of large point proliferation with this scale in combination with the JT_ROUND option, but in the four places where that option is used, scale is already explicitly set to a safer low value.	2012-09-27 05:50:54 -07:00