internal virtual int Find_prev_non_degenerate(com.epl.geometry.SegmentIterator segIter, int index)
{
segIter.ResetToVertex(index, -1);
while (segIter.HasPreviousSegment())
{
com.epl.geometry.Segment segment = segIter.PreviousSegment();
double length = segment.CalculateLength2D();
if (length != 0)
{
return(segIter.GetStartPointIndex());
}
}
return(-1);
}
public static com.epl.geometry.QuadTree BuildQuadTree(com.epl.geometry.MultiPath multipath)
{
com.epl.geometry.Envelope2D extent = new com.epl.geometry.Envelope2D();
multipath.QueryEnvelope2D(extent);
com.epl.geometry.QuadTree quadTree = new com.epl.geometry.QuadTree(extent, 8);
int hint_index = -1;
com.epl.geometry.SegmentIterator seg_iter = multipath.QuerySegmentIterator();
while (seg_iter.NextPath())
{
while (seg_iter.HasNextSegment())
{
com.epl.geometry.Segment segment = seg_iter.NextSegment();
int index = seg_iter.GetStartPointIndex();
com.epl.geometry.Envelope2D boundingbox = new com.epl.geometry.Envelope2D();
segment.QueryEnvelope2D(boundingbox);
hint_index = quadTree.Insert(index, boundingbox, hint_index);
}
}
return(quadTree);
}
internal virtual com.epl.geometry.Proximity2DResult MultiPathGetNearestCoordinate(com.epl.geometry.MultiPath geom, com.epl.geometry.Point2D inputPoint, bool bTestPolygonInterior, bool bCalculateLeftRightSide)
{
if (geom.GetType() == com.epl.geometry.Geometry.Type.Polygon && bTestPolygonInterior)
{
com.epl.geometry.Envelope2D env = new com.epl.geometry.Envelope2D();
geom.QueryEnvelope2D(env);
double tolerance = com.epl.geometry.InternalUtils.CalculateToleranceFromGeometry(null, env, false);
com.epl.geometry.PolygonUtils.PiPResult pipResult;
if (bCalculateLeftRightSide)
{
pipResult = com.epl.geometry.PolygonUtils.IsPointInPolygon2D((com.epl.geometry.Polygon)geom, inputPoint, 0.0);
}
else
{
pipResult = com.epl.geometry.PolygonUtils.IsPointInPolygon2D((com.epl.geometry.Polygon)geom, inputPoint, tolerance);
}
if (pipResult != com.epl.geometry.PolygonUtils.PiPResult.PiPOutside)
{
com.epl.geometry.Proximity2DResult result = new com.epl.geometry.Proximity2DResult(inputPoint, 0, 0.0);
if (bCalculateLeftRightSide)
{
result.SetRightSide(true);
}
return(result);
}
}
com.epl.geometry.SegmentIterator segIter = geom.QuerySegmentIterator();
com.epl.geometry.Point2D closest = new com.epl.geometry.Point2D();
int closestVertexIndex = -1;
int closestPathIndex = -1;
double closestDistanceSq = com.epl.geometry.NumberUtils.DoubleMax();
bool bRight = false;
int num_candidates = 0;
while (segIter.NextPath())
{
while (segIter.HasNextSegment())
{
com.epl.geometry.Segment segment = segIter.NextSegment();
double t = segment.GetClosestCoordinate(inputPoint, false);
com.epl.geometry.Point2D point = segment.GetCoord2D(t);
double distanceSq = com.epl.geometry.Point2D.SqrDistance(point, inputPoint);
if (distanceSq < closestDistanceSq)
{
num_candidates = 1;
closest = point;
closestVertexIndex = segIter.GetStartPointIndex();
closestPathIndex = segIter.GetPathIndex();
closestDistanceSq = distanceSq;
}
else
{
if (distanceSq == closestDistanceSq)
{
num_candidates++;
}
}
}
}
com.epl.geometry.Proximity2DResult result_1 = new com.epl.geometry.Proximity2DResult(closest, closestVertexIndex, System.Math.Sqrt(closestDistanceSq));
if (bCalculateLeftRightSide)
{
segIter.ResetToVertex(closestVertexIndex, closestPathIndex);
com.epl.geometry.Segment segment = segIter.NextSegment();
bRight = (com.epl.geometry.Point2D.OrientationRobust(inputPoint, segment.GetStartXY(), segment.GetEndXY()) < 0);
if (num_candidates > 1)
{
com.epl.geometry.OperatorProximity2DLocal.Side_helper sideHelper = new com.epl.geometry.OperatorProximity2DLocal.Side_helper(this);
sideHelper.Reset();
bRight = sideHelper.Calc_side(inputPoint, bRight, geom, closestVertexIndex, closestPathIndex);
}
result_1.SetRightSide(bRight);
}
return(result_1);
}