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improve thin wall detection

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This commit is contained in:
Stewart Allen 2018-01-14 13:15:05 -05:00
commit 8a4e5a053f
7 changed files with 51 additions and 40 deletions
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12
js/geo-polygons.js
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@ -447,7 +447,6 @@ var gs_base_polygons = exports;
* @param {Polygon[]} polys
* @param {number} dist1 first offset distance
* @param {number} dist2 2nd thru last offset distance
* @param {number} over additional offset over then under
* @param {Polygon[]} out optional collector
* @param {number} count offset passes (0 == until no space left)
* @param {Function} collector receives output of each pass
@ -455,7 +454,7 @@ var gs_base_polygons = exports;
* @param {number} [z] defaults to 0
* @returns {Polygon[]} last offset
*/
function expand2(polys, dist1, dist2, over, out, count, collector, thins, z) {
function expand2(polys, dist1, dist2, out, count, collector, thins, z) {
// prepare alignments for clipper lib
alignWindings(polys);
polys.forEach(function(poly) {
@ -470,7 +469,8 @@ var gs_base_polygons = exports;
cety = clib.EndType,
coff = new clib.ClipperOffset(),
ctre = new clib.PolyTree(),
orig = polys;
orig = polys,
over = dist1 * 0.45;
// inset
polys.forEach(function(poly) {
@ -489,7 +489,7 @@ var gs_base_polygons = exports;
var simple = clip.SimplifyPolygons(clean, cpft.pftNonZero);
coff.AddPaths(simple, cjnt.jtMiter, cety.etClosedPolygon);
});
coff.Execute(ctre, (-over) * fact);
coff.Execute(ctre, -over * fact);
polys = fromClipperTree(ctre, z);
// detect possible thin walls
@ -499,7 +499,7 @@ var gs_base_polygons = exports;
diff = Math.abs(1 - (circ1 / circ2));
if (diff > 0.2) {
thins(orig, polys, diff);
thins(orig, out.length ? polys : null, diff, -over);
}
}
@ -507,7 +507,7 @@ var gs_base_polygons = exports;
if (out) out.appendAll(polys);
if (collector) collector(polys, count);
if ((count === 0 || count > 1) && polys.length > 0) {
expand2(polys, dist2 || dist1, dist2, over, out, count > 0 ? count-1 : 0, collector, thins, z);
expand2(polys, dist2 || dist1, dist2, out, count > 0 ? count-1 : 0, collector, thins, z);
}
return polys;