} // public Geometry GetResultGeometry( int funcCode )
private void ComputeOverlay( int opCode )
{
// copy points from input Geometries.
// This ensures that any Point geometries
// in the input are considered for inclusion in the result set
CopyPoints(0);
CopyPoints(1);
// node the input Geometries
_arg[0].ComputeSelfNodes( _li );
_arg[1].ComputeSelfNodes( _li );
// compute intersections between edges of the two input geometries
_arg[0].ComputeEdgeIntersections( _arg[1], _li, true );
ArrayList baseSplitEdges = new ArrayList();
_arg[0].ComputeSplitEdges( baseSplitEdges );
_arg[1].ComputeSplitEdges( baseSplitEdges );
ArrayList splitEdges = new ArrayList( baseSplitEdges );
/* NO LONGER USED
// if we are working in fixed precision, we must renode to ensure noding is complete
if (makePrecise) {
List splitEdges1 = completeEdgeNoding(baseSplitEdges);
splitEdges = completeEdgeNoding(splitEdges1);
} */
// add the noded edges to this result graph
InsertUniqueEdges( baseSplitEdges );
ComputeLabelsFromDepths();
ReplaceCollapsedEdges();
//Trace.WriteLine( edgeList.ToString());
_graph.AddEdges( _edgeList );
ComputeLabelling();
LabelIncompleteNodes();
// The ordering of building the result Geometries is important.
// Areas must be built before lines, which must be built before points.
// This is so that lines which are covered by areas are not included
// explicitly, and similarly for points.
FindResultAreaEdges( opCode );
CancelDuplicateResultEdges();
PolygonBuilder polyBuilder = new PolygonBuilder( _geomFact, _cga );
polyBuilder.Add( _graph );
_resultPolyList = polyBuilder.GetPolygons();
LineBuilder lineBuilder = new LineBuilder( this, _geomFact, _ptLocator );
_resultLineList = lineBuilder.Build( opCode );
PointBuilder pointBuilder = new PointBuilder( this, _geomFact, _ptLocator );
_resultPointList = pointBuilder.Build( opCode );
// gather the results from all calculations into a single Geometry for the result set
_resultGeom = ComputeGeometry( _resultPointList, _resultLineList, _resultPolyList );
} //private void ComputeOverlay( int opCode )
} // public Geometry GetResultGeometry( int funcCode )
private void ComputeOverlay(int opCode)
{
// copy points from input Geometries.
// This ensures that any Point geometries
// in the input are considered for inclusion in the result set
CopyPoints(0);
CopyPoints(1);
// node the input Geometries
_arg[0].ComputeSelfNodes(_li);
_arg[1].ComputeSelfNodes(_li);
// compute intersections between edges of the two input geometries
_arg[0].ComputeEdgeIntersections(_arg[1], _li, true);
ArrayList baseSplitEdges = new ArrayList();
_arg[0].ComputeSplitEdges(baseSplitEdges);
_arg[1].ComputeSplitEdges(baseSplitEdges);
ArrayList splitEdges = new ArrayList(baseSplitEdges);
/* NO LONGER USED
* // if we are working in fixed precision, we must renode to ensure noding is complete
* if (makePrecise) {
* List splitEdges1 = completeEdgeNoding(baseSplitEdges);
* splitEdges = completeEdgeNoding(splitEdges1);
* } */
// add the noded edges to this result graph
InsertUniqueEdges(baseSplitEdges);
ComputeLabelsFromDepths();
ReplaceCollapsedEdges();
//Trace.WriteLine( edgeList.ToString());
_graph.AddEdges(_edgeList);
ComputeLabelling();
LabelIncompleteNodes();
// The ordering of building the result Geometries is important.
// Areas must be built before lines, which must be built before points.
// This is so that lines which are covered by areas are not included
// explicitly, and similarly for points.
FindResultAreaEdges(opCode);
CancelDuplicateResultEdges();
PolygonBuilder polyBuilder = new PolygonBuilder(_geomFact, _cga);
polyBuilder.Add(_graph);
_resultPolyList = polyBuilder.GetPolygons();
LineBuilder lineBuilder = new LineBuilder(this, _geomFact, _ptLocator);
_resultLineList = lineBuilder.Build(opCode);
PointBuilder pointBuilder = new PointBuilder(this, _geomFact, _ptLocator);
_resultPointList = pointBuilder.Build(opCode);
// gather the results from all calculations into a single Geometry for the result set
_resultGeom = ComputeGeometry(_resultPointList, _resultLineList, _resultPolyList);
} //private void ComputeOverlay( int opCode )
