/// <summary>
/// Collect edges from Area inputs which should be in the result but
/// which have not been included in a result area.
/// This happens ONLY:
/// during an intersection when the boundaries of two
/// areas touch in a line segment
/// OR as a result of a dimensional collapse.
/// </summary>
/// <param name="de"></param>
/// <param name="opCode"></param>
/// <param name="edges"></param>
public void CollectBoundaryTouchEdge(DirectedEdge de, SpatialFunctions opCode, IList edges)
{
Label label = de.Label;
if (de.IsLineEdge)
{
return; // only interested in area edges
}
if (de.IsVisited)
{
return; // already processed
}
if (de.IsInteriorAreaEdge)
{
return; // added to handle dimensional collapses
}
if (de.Edge.IsInResult)
{
return; // if the edge linework is already included, don't include it again
}
// sanity check for labelling of result edgerings
Assert.IsTrue(!(de.IsInResult || de.Sym.IsInResult) || !de.Edge.IsInResult);
// include the linework if it's in the result of the operation
if (OverlayOp.IsResultOfOp(label, opCode) && opCode == SpatialFunctions.Intersection)
{
edges.Add(de.Edge);
de.VisitedEdge = true;
}
}
public static IGeometry Overlay(IGeometry geom0, IGeometry geom1, SpatialFunction opCode)
{
var gov = new OverlayOp(geom0, geom1);
var geomOv = gov.GetResultGeometry(opCode);
return(geomOv);
}
/// <summary>
///
/// </summary>
/// <param name="de"></param>
/// <param name="opCode"></param>
/// <param name="edges"></param>
public void CollectLineEdge(DirectedEdge de, SpatialFunctions opCode, IList edges)
{
Label label = de.Label;
Edge e = de.Edge;
// include Curve edges which are in the result
if (de.IsLineEdge)
{
if (!de.IsVisited && OverlayOp.IsResultOfOp(label, opCode) && !e.IsCovered)
{
edges.Add(e);
de.VisitedEdge = true;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="opCode"></param>
/// <returns></returns>
private IList CollectNodes(SpatialFunction opCode)
{
IList resultNodeList = new ArrayList();
// add nodes from edge intersections which have not already been included in the result
IEnumerator nodeit = op.Graph.Nodes.GetEnumerator();
while (nodeit.MoveNext())
{
Node n = (Node) nodeit.Current;
if (!n.IsInResult)
{
Label label = n.Label;
if (OverlayOp.IsResultOfOp(label, opCode))
resultNodeList.Add(n);
}
}
return resultNodeList;
}
/// <summary>
///
/// </summary>
/// <param name="op"></param>
/// <param name="geometryFactory"></param>
/// <param name="ptLocator"></param>
public LineBuilder(OverlayOp op, IGeometryFactory geometryFactory, PointLocator ptLocator)
{
this.op = op;
this.geometryFactory = geometryFactory;
this.ptLocator = ptLocator;
}
/// <summary>
///
/// </summary>
/// <param name="op"></param>
/// <param name="geometryFactory"></param>
/// <param name="ptLocator"></param>
public LineBuilder(OverlayOp op, IGeometryFactory geometryFactory, PointLocator ptLocator)
{
this.op = op;
this.geometryFactory = geometryFactory;
this.ptLocator = ptLocator;
}
/// <summary>
///
/// </summary>
/// <param name="geom0"></param>
/// <param name="geom1"></param>
/// <param name="opCode"></param>
/// <returns></returns>
public static IGeometry Overlay(IGeometry geom0, IGeometry geom1, SpatialFunctions opCode)
{
OverlayOp gov = new OverlayOp(geom0, geom1);
IGeometry geomOv = gov.GetResultGeometry(opCode);
return geomOv;
}