public OffsetCurveSetBuilder(Geometry inputGeom,
double distance, OffsetCurveBuilder curveBuilder)
{
curveList = new ArrayList();
this.inputGeom = inputGeom;
m_dDistance = distance;
this.curveBuilder = curveBuilder;
}
public virtual Geometry Buffer(Geometry g, double distance)
{
PrecisionModel 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, quadrantSegments);
curveBuilder.EndCapStyle = endCapStyle;
OffsetCurveSetBuilder curveSetBuilder =
new OffsetCurveSetBuilder(g, distance, curveBuilder);
ArrayList bufferSegStrList = curveSetBuilder.Curves;
// short-circuit test
if (bufferSegStrList.Count <= 0)
{
Geometry emptyGeom =
geomFact.CreateGeometryCollection(new Geometry[0]);
return emptyGeom;
}
ComputeNodedEdges(bufferSegStrList, precisionModel);
graph = new PlanarGraph(new OverlayNodeFactory());
graph.AddEdges(edgeList.Edges);
IList subgraphList = CreateSubgraphs(graph);
PolygonBuilder polyBuilder = new PolygonBuilder(geomFact);
BuildSubgraphs(subgraphList, polyBuilder);
GeometryList resultPolyList = polyBuilder.Build();
Geometry resultGeom = geomFact.BuildGeometry(resultPolyList);
return resultGeom;
}