/**
* Calculate possible hull of a pair of polygons
*
* @param a
* @param b
* @return possible hull
*/
private static EdPolygon calcPHull(EdPolygon aPoly, EdPolygon bPoly) {
final boolean db = true;
if (db && T.update())
T.msg(
"calc possible hull of two polygons"
+ T.show(aPoly, MyColor.cBLUE, STRK_THICK, -1)
+ T.show(bPoly, MyColor.cDARKGREEN, STRK_THICK, -1));
PtEntry a = PtEntry.buildFrom(aPoly);
PtEntry b = PtEntry.buildFrom(bPoly);
PtEntry aHull = PtEntry.convexHull(a);
PtEntry bHull = PtEntry.convexHull(b);
inf = Inf.create();
if (db && T.update()) {
T.msg(
"convex hulls"
+ T.show(aHull.toPolygon(), MyColor.cBLUE, STRK_THICK, -1)
+ T.show(bHull.toPolygon(), MyColor.cDARKGREEN, STRK_THICK, -1));
}
PtEntry ph = hullOfPolygons(a, b, aHull, bHull);
traceHullPt = ph;
insertValleys(ph, a.source(), b.source());
expandHull(ph, aHull, bHull, true);
expandHull(ph, aHull, bHull, false);
return ph.toPolygon();
}
