private static void renderHull(PtEntry pt) {
Inf inf = Inf.create();
int count = 30;
PtEntry ptStart = pt;
do {
inf.update();
if (pt.prev(true) != null) {
boolean valley = false;
valley =
(pt.prev(true).source() == pt.source() && pt.prev(true).orig().next(true) != pt.orig());
V.pushColor(MyColor.cBLUE);
V.pushStroke(valley ? STRK_RUBBERBAND : STRK_THICK);
V.drawLine(pt.prev(true), pt);
V.pop(2);
}
V.pushColor(MyColor.cDARKGREEN);
V.mark(pt, MARK_DISC, .6);
V.pop();
if (Editor.withLabels(true)) {
StringBuilder sb = new StringBuilder();
sb.append(" #" + pt.id());
if (pt.source() != null) sb.append(" <" + pt.source() + ">");
V.pushScale(.6);
V.draw(sb.toString(), MyMath.ptOnCircle(pt, MyMath.radians(30), 3), TX_FRAME | TX_BGND);
V.pop();
}
pt = pt.next(true);
if (count-- == 0) V.draw("too many points rendering!", 50, 50, TX_CLAMP);
} while (pt != ptStart && count > 0);
}
/**
* 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();
}