public static Polygon GetRadiusAsPolygonGeodesic(MapPoint center, double distance, int pointCount)
{
Polyline line = GetRadiusGeodesicAsPolyline(center, distance, pointCount);
Polygon poly = new Polygon() { SpatialReference = new SpatialReference(4326) };
if (line.Paths.Count > 1)
{
PointCollection ring = line.Paths[0];
MapPoint last = ring[ring.Count - 1];
for (int i = 1; i < line.Paths.Count; i++)
{
PointCollection pnts = line.Paths[i];
ring.Add(new MapPoint(180 * Math.Sign(last.X), 90 * Math.Sign(center.Y)));
last = pnts[0];
ring.Add(new MapPoint(180 * Math.Sign(last.X), 90 * Math.Sign(center.Y)));
foreach (MapPoint p in pnts)
ring.Add(p);
last = pnts[pnts.Count - 1];
}
poly.Rings.Add(ring);
}
else
{
poly.Rings.Add(line.Paths[0]);
}
if (distance > _EARTHCIRCUMFERENCE_ * Math.PI / 2 && line.Paths.Count != 2)
{
PointCollection pnts = new PointCollection();
pnts.Add(new MapPoint(-180, -90));
pnts.Add(new MapPoint(180, -90));
pnts.Add(new MapPoint(180, 90));
pnts.Add(new MapPoint(-180, 90));
pnts.Add(new MapPoint(-180, -90));
poly.Rings.Add(pnts); //Exterior
}
return poly;
}