/// <summary>
///
/// </summary>
/// <returns></returns>
public bool MoveNext()
{
if (_currNode == null)
{
_currNode = _nextNode;
_currSegIndex = _currNode.SegmentIndex;
ReadNextNode();
return(true);
}
// check for trying to read too far
if (_nextNode == null)
{
return(false);
}
if (_nextNode.SegmentIndex == _currNode.SegmentIndex)
{
_currNode = _nextNode;
_currSegIndex = _currNode.SegmentIndex;
ReadNextNode();
return(true);
}
if (_nextNode.SegmentIndex > _currNode.SegmentIndex)
{
}
return(false);
}
private void AddEdgeCoordinates(SegmentNode ei0, SegmentNode ei1,
CoordinateList coordList)
{
var npts = ei1.SegmentIndex - ei0.SegmentIndex + 2;
var lastSegStartPt = _edge.GetCoordinate(ei1.SegmentIndex);
// if the last intersection point is not equal to the its segment start pt,
// add it to the points list as well.
// (This check is needed because the distance metric is not totally reliable!)
// The check for point equality is 2D only - Z values are ignored
var useIntPt1 = ei1.IsInterior || !ei1.Coord.Equals2D(lastSegStartPt);
if (!useIntPt1)
{
npts--;
}
var ipt = 0;
coordList.Add(new Coordinate(ei0.Coord), false);
for (var i = ei0.SegmentIndex + 1; i <= ei1.SegmentIndex; i++)
{
coordList.Add(_edge.GetCoordinate(i));
}
if (useIntPt1)
{
coordList.Add(new Coordinate(ei1.Coord));
}
}
/*
* /// <summary>
* /// Checks the correctness of the set of split edges corresponding to this edge.
* /// </summary>
* /// <param name="splitEdges"></param>
* private void CheckSplitEdgesCorrectness(IList<ISegmentString> splitEdges)
* {
* var edgePts = _edge.Coordinates;
*
* // check that first and last points of split edges are same as endpoints of edge
* var split0 = (ISegmentString) splitEdges[0];
* var pt0 = split0.Coordinates[0];
* if (!pt0.Equals2D(edgePts[0]))
* throw new Exception("bad split edge start point at " + pt0);
*
* var splitn = (ISegmentString)splitEdges[splitEdges.Count - 1];
* var splitnPts = splitn.Coordinates;
* var ptn = splitnPts[splitnPts.Length - 1];
* if (!ptn.Equals2D(edgePts[edgePts.Length - 1]))
* throw new Exception("bad split edge end point at " + ptn);
* }
*/
/// <summary>
/// Create a new "split edge" with the section of points between
/// (and including) the two intersections.
/// The label for the new edge is the same as the label for the parent edge.
/// </summary>
/// <param name="ei0"></param>
/// <param name="ei1"></param>
/// <returns></returns>
ISegmentString CreateSplitEdge(SegmentNode ei0, SegmentNode ei1)
{
var npts = ei1.SegmentIndex - ei0.SegmentIndex + 2;
var lastSegStartPt = _edge.GetCoordinate(ei1.SegmentIndex);
// if the last intersection point is not equal to the its segment start pt, add it to the points list as well.
// (This check is needed because the distance metric is not totally reliable!)
// The check for point equality is 2D only - Z values are ignored
var useIntPt1 = ei1.IsInterior || !ei1.Coord.Equals2D(lastSegStartPt);
if (!useIntPt1)
{
npts--;
}
var pts = new Coordinate[npts];
var ipt = 0;
pts[ipt++] = new Coordinate(ei0.Coord);
for (var i = ei0.SegmentIndex + 1; i <= ei1.SegmentIndex; i++)
{
pts[ipt++] = _edge.GetCoordinate(i);
}
if (useIntPt1)
{
pts[ipt] = new Coordinate(ei1.Coord);
}
return(new NodedSegmentString(pts, _edge.Context));
}
/// <summary>
/// Extracts the points for a split edge running between two nodes.
/// The extracted points should contain no duplicate points.
/// There should always be at least two points extracted
/// (which will be the given nodes).
/// </summary>
/// <param name="ei0">The start node of the split edge</param>
/// <param name="ei1">The end node of the split edge</param>
/// <returns>The points for the split edge</returns>
private Coordinate[] CreateSplitEdgePts(SegmentNode ei0, SegmentNode ei1)
{
//Debug.WriteLine("\nCreateSplitEdge"); Debug.print(ei0); Debug.print(ei1);
int npts = ei1.SegmentIndex - ei0.SegmentIndex + 2;
var lastSegStartPt = _edge.GetCoordinate(ei1.SegmentIndex);
// if the last intersection point is not equal to the its segment start pt, add it to the points list as well.
// (This check is needed because the distance metric is not totally reliable!)
// The check for point equality is 2D only - Z values are ignored
bool useIntPt1 = ei1.IsInterior || !ei1.Coord.Equals2D(lastSegStartPt);
if (!useIntPt1)
{
npts--;
}
var pts = new Coordinate[npts];
int ipt = 0;
pts[ipt++] = ei0.Coord.Copy();
for (int i = ei0.SegmentIndex + 1; i <= ei1.SegmentIndex; i++)
{
pts[ipt++] = _edge.GetCoordinate(i);
}
if (useIntPt1)
{
pts[ipt] = ei1.Coord.Copy();
}
return(pts);
}
/// <summary>
///
/// </summary>
private void ReadNextNode()
{
if (_nodeIt.MoveNext())
{
_nextNode = (SegmentNode)_nodeIt.Current;
}
else
{
_nextNode = null;
}
}
/// <summary>
/// Adds an intersection into the list, if it isn't already there.
/// The input segmentIndex and dist are expected to be normalized.
/// </summary>
/// <param name="intPt"></param>
/// <param name="segmentIndex"></param>
/// <returns>The SegmentIntersection found or added.</returns>
public SegmentNode Add(Coordinate intPt, int segmentIndex)
{
var eiNew = new SegmentNode(_edge, intPt, segmentIndex, _edge.GetSegmentOctant(segmentIndex));
object eiObj;
if (_nodeMap.TryGetValue(eiNew, out eiObj))
{
var ei = (SegmentNode)eiObj;
// debugging sanity check
Assert.IsTrue(ei.Coord.Equals2D(intPt), "Found equal nodes with different coordinates");
return(ei);
}
// node does not exist, so create it
_nodeMap.Add(eiNew, eiNew);
return(eiNew);
}
/// <summary>
///
/// </summary>
/// <param name="ei0"></param>
/// <param name="ei1"></param>
/// <param name="collapsedVertexIndex"></param>
/// <returns></returns>
private static bool FindCollapseIndex(SegmentNode ei0, SegmentNode ei1, int[] collapsedVertexIndex)
{
// only looking for equal nodes
if (!ei0.Coord.Equals2D(ei1.Coord))
{
return(false);
}
var numVerticesBetween = ei1.SegmentIndex - ei0.SegmentIndex;
if (!ei1.IsInterior)
{
numVerticesBetween--;
}
// if there is a single vertex between the two equal nodes, this is a collapse
if (numVerticesBetween == 1)
{
collapsedVertexIndex[0] = ei0.SegmentIndex + 1;
return(true);
}
return(false);
}
/*
* /// <summary>
* /// Checks the correctness of the set of split edges corresponding to this edge.
* /// </summary>
* /// <param name="splitEdges"></param>
* private void CheckSplitEdgesCorrectness(IList<ISegmentString> splitEdges)
* {
* var edgePts = _edge.Coordinates;
*
* // check that first and last points of split edges are same as endpoints of edge
* var split0 = (ISegmentString) splitEdges[0];
* var pt0 = split0.Coordinates[0];
* if (!pt0.Equals2D(edgePts[0]))
* throw new Exception("bad split edge start point at " + pt0);
*
* var splitn = (ISegmentString)splitEdges[splitEdges.Count - 1];
* var splitnPts = splitn.Coordinates;
* var ptn = splitnPts[splitnPts.Length - 1];
* if (!ptn.Equals2D(edgePts[edgePts.Length - 1]))
* throw new Exception("bad split edge end point at " + ptn);
* }
*/
/// <summary>
/// Create a new "split edge" with the section of points between
/// (and including) the two intersections.
/// The label for the new edge is the same as the label for the parent edge.
/// </summary>
/// <param name="ei0"></param>
/// <param name="ei1"></param>
/// <returns></returns>
private ISegmentString CreateSplitEdge(SegmentNode ei0, SegmentNode ei1)
{
var pts = CreateSplitEdgePts(ei0, ei1);
return(new NodedSegmentString(pts, _edge.Context));
}
public LineNode(SegmentNode node, Location locForward, Location locBackward)
{
_node = node;
_location[Forward] = locForward;
_location[Backward] = locBackward;
}
