public IGeometry Buffer(IGeometry g, double distance)
{
IPrecisionModel precisionModel = _workingPrecisionModel;
if (precisionModel == null)
precisionModel = g.PrecisionModel;
// factory must be the same as the one used by the input
_geomFact = g.Factory;
OffsetCurveBuilder curveBuilder = new OffsetCurveBuilder(precisionModel, _bufParams);
OffsetCurveSetBuilder curveSetBuilder = new OffsetCurveSetBuilder(g, distance, curveBuilder);
var bufferSegStrList = curveSetBuilder.GetCurves();
// short-circuit test
if (bufferSegStrList.Count <= 0)
{
return CreateEmptyResultGeometry();
}
ComputeNodedEdges(bufferSegStrList, precisionModel);
_graph = new PlanarGraph(new OverlayNodeFactory());
_graph.AddEdges(_edgeList.Edges);
IEnumerable<BufferSubgraph> subgraphList = CreateSubgraphs(_graph);
PolygonBuilder polyBuilder = new PolygonBuilder(_geomFact);
BuildSubgraphs(subgraphList, polyBuilder);
var resultPolyList = polyBuilder.Polygons;
// just in case...
if (resultPolyList.Count <= 0)
{
return CreateEmptyResultGeometry();
}
IGeometry resultGeom = _geomFact.BuildGeometry(resultPolyList);
return resultGeom;
}
/// <summary>
///
/// </summary>
/// <param name="inputGeom"></param>
/// <param name="distance"></param>
/// <param name="curveBuilder"></param>
public OffsetCurveSetBuilder(IGeometry inputGeom, double distance, OffsetCurveBuilder curveBuilder)
{
_inputGeom = inputGeom;
_distance = distance;
_curveBuilder = curveBuilder;
}