private void AddPolygonRing(WriteableBitmap context, SqlGeometry polygon, Func <Point, Point> transform, int border, int fill)
{
int numberOfPoints = polygon.STNumPoints().Value;
int[] points = new int[2 * numberOfPoints];
//STPointN(index): index is between 1 and number of points
for (int i = 0; i < numberOfPoints; i++)
{
var point = transform(polygon.STPointN(i + 1).AsWpfPoint());
points[2 * i] = (int)point.X;
points[2 * i + 1] = (int)point.Y;
}
//if (border.HasValue)
//{
WriteableBitmapExtensions.DrawPolylineAa(context, points, border);
//}
//if (fill.HasValue)
//{
WriteableBitmapExtensions.FillPolygon(context, points, fill);
//}
}