public static Geometry AddHole(Geometry polyGeom, Geometry hole)
{
var factory = polyGeom.Factory;
// input checks
if (!(polyGeom is Polygon polygon))
{
throw new ArgumentException("A is not a polygon");
}
if (!(hole is Polygon || hole is LineString))
{
throw new ArgumentException("B must be a polygon or line");
}
var holePts = ExtractLine(hole);
if (!CoordinateArrays.IsRing(holePts))
{
throw new ArgumentException("B is not a valid ring");
}
var shell = (LinearRing)polygon.ExteriorRing.Copy();
var holes = new LinearRing[polygon.NumInteriorRings + 1];
for (int i = 0; i < polygon.NumInteriorRings; i++)
{
holes[i] = (LinearRing)polygon.GetInteriorRingN(i).Copy();
}
holes[holes.Length - 1] = factory.CreateLinearRing(holePts);
return(factory.CreatePolygon(shell, holes));
}
private void AddLineString(Geometry line)
{
if (_curveBuilder.IsLineOffsetEmpty(_distance))
{
return;
}
var coord = CoordinateArrays.RemoveRepeatedPoints(line.Coordinates);
/*
* Rings (closed lines) are generated with a continuous curve,
* with no end arcs. This produces better quality linework,
* and avoids noding issues with arcs around almost-parallel end segments.
* See JTS #523 and #518.
*
* Singled-sided buffers currently treat rings as if they are lines.
*/
if (CoordinateArrays.IsRing(coord) && !_curveBuilder.BufferParameters.IsSingleSided)
{
AddRingBothSides(coord, _distance);
}
else
{
var curve = _curveBuilder.GetLineCurve(coord, _distance);
AddCurve(curve, Location.Exterior, Location.Interior);
}
}