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add min sizing for poly cleanup in more cases

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This commit is contained in:
Stewart Allen 2020-05-09 20:33:25 -04:00
commit 579fdaccfa
5 changed files with 18 additions and 15 deletions
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19
js/geo-polygons.js
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@ -62,21 +62,24 @@ var gs_base_polygons = exports;
return poly;
};
function fromClipperTree(tnode, z, tops, parent) {
function fromClipperTree(tnode, z, tops, parent, minarea) {
var polys = tops || [],
poly;
poly,
min = minarea || 0.1;
tnode.m_Childs.forEach(function(child) {
poly = fromClipperNode(child, z);
// throw out all tiny polygons
if (poly.area() < 0.1) return;
if (poly.area() < min) {
return;
}
if (parent) {
parent.addInner(poly);
} else {
polys.push(poly);
}
if (child.m_Childs) {
fromClipperTree(child, z, polys, parent ? null : poly);
fromClipperTree(child, z, polys, parent ? null : poly, minarea);
}
});
@ -298,7 +301,7 @@ var gs_base_polygons = exports;
if (clip.Execute(ctyp.ctDifference, ctre, cfil.pftEvenOdd, cfil.pftEvenOdd)) {
cleanClipperTree(ctre);
filter(fromClipperTree(ctre, z), outA);
filter(fromClipperTree(ctre, z, null, null, min), outA);
}
}
@ -313,7 +316,7 @@ var gs_base_polygons = exports;
if (clip.Execute(ctyp.ctDifference, ctre, cfil.pftEvenOdd, cfil.pftEvenOdd)) {
cleanClipperTree(ctre);
filter(fromClipperTree(ctre, z), outB);
filter(fromClipperTree(ctre, z, null, null, min), outB);
}
}
@ -416,7 +419,7 @@ var gs_base_polygons = exports;
* @param {Function} [collector] receives output of each pass
* @returns {Polygon[]} last offset
*/
function expand(polys, distance, z, out, count, distance2, collector) {
function expand(polys, distance, z, out, count, distance2, collector, min) {
// prepare alignments for clipper lib
alignWindings(polys);
polys.forEach(function(poly) {
@ -440,7 +443,7 @@ var gs_base_polygons = exports;
});
coff.Execute(ctre, distance * fact);
polys = fromClipperTree(ctre, z);
polys = fromClipperTree(ctre, z, null, null, min);
if (out) out.appendAll(polys);
if (collector) collector(polys, count);