void ProvinceSubstractProvinceEnclaves(int provinceIndex, Region region, Poly2Tri.Polygon poly)
{
List <Region> negativeRegions = new List <Region> ();
for (int oc = 0; oc < _countries.Length; oc++)
{
Country ocCountry = _countries [oc];
if (ocCountry.hidden || ocCountry.provinces == null)
{
continue;
}
if (!ocCountry.regionsRect2D.Overlaps(region.latlonRect2D))
{
continue;
}
for (int op = 0; op < ocCountry.provinces.Length; op++)
{
Province opProvince = ocCountry.provinces [op];
if (opProvince == provinces [provinceIndex] || opProvince.hidden)
{
continue;
}
if (opProvince.regions == null)
{
continue;
}
if (opProvince.regionsRect2D.Overlaps(region.latlonRect2D, true))
{
Region oProvRegion = opProvince.regions [opProvince.mainRegionIndex];
if (region.Contains(oProvRegion)) // just check main region of province for speed purposes
{
negativeRegions.Add(oProvRegion);
}
}
}
}
// Collapse negative regions in big holes
// Collapse negative regions in big holes
for (int nr = 0; nr < negativeRegions.Count - 1; nr++)
{
for (int nr2 = nr + 1; nr2 < negativeRegions.Count; nr2++)
{
if (negativeRegions [nr].Intersects(negativeRegions [nr2]))
{
Clipper clipper = new Clipper();
clipper.AddPath(negativeRegions [nr], PolyType.ptSubject);
clipper.AddPath(negativeRegions [nr2], PolyType.ptClip);
clipper.Execute(ClipType.ctUnion, negativeRegions [nr]);
negativeRegions.RemoveAt(nr2);
nr = -1;
break;
}
}
}
// Substract holes
for (int r = 0; r < negativeRegions.Count; r++)
{
Poly2Tri.Polygon polyHole = new Poly2Tri.Polygon(negativeRegions [r].latlon);
poly.AddHole(polyHole);
}
}
