/// <summary>
///
/// </summary>
/// <param name="line"></param>
/// <param name="pt"></param>
/// <param name="locGeom"></param>
private void ComputeMinDistance(ILineString line, Point pt, GeometryLocation[] locGeom)
{
if (line.EnvelopeInternal.Distance(pt.EnvelopeInternal) > _minDistance) return;
IList<Coordinate> coord0 = line.Coordinates;
Coordinate coord = pt.Coordinate;
// brute force approach!
for (int i = 0; i < coord0.Count - 1; i++)
{
double dist = CGAlgorithms.DistancePointLine(coord, coord0[i], coord0[i + 1]);
if (dist < _minDistance)
{
_minDistance = dist;
LineSegment seg = new LineSegment(coord0[i], coord0[i + 1]);
Coordinate segClosestPoint = new Coordinate(seg.ClosestPoint(coord));
locGeom[0] = new GeometryLocation(line, i, segClosestPoint);
locGeom[1] = new GeometryLocation(pt, 0, coord);
}
if (_minDistance <= _terminateDistance) return;
}
}
/// <summary>
///
/// </summary>
/// <param name="lines"></param>
/// <param name="points"></param>
/// <param name="locGeom"></param>
private void ComputeMinDistanceLinesPoints(IList lines, IList points, GeometryLocation[] locGeom)
{
for (int i = 0; i < lines.Count; i++)
{
LineString line = (LineString)lines[i];
for (int j = 0; j < points.Count; j++)
{
Point pt = (Point)points[j];
ComputeMinDistance(line, pt, locGeom);
if (_minDistance <= _terminateDistance) return;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="line0"></param>
/// <param name="line1"></param>
/// <param name="locGeom"></param>
private void ComputeMinDistance(ILineString line0, ILineString line1, GeometryLocation[] locGeom)
{
if (line0.EnvelopeInternal.Distance(line1.EnvelopeInternal) > _minDistance) return;
IList<Coordinate> coord0 = line0.Coordinates;
IList<Coordinate> coord1 = line1.Coordinates;
// brute force approach!
for (int i = 0; i < coord0.Count - 1; i++)
{
for (int j = 0; j < coord1.Count - 1; j++)
{
double dist = CGAlgorithms.DistanceLineLine(
coord0[i], coord0[i + 1],
coord1[j], coord1[j + 1]);
if (dist < _minDistance)
{
_minDistance = dist;
LineSegment seg0 = new LineSegment(coord0[i], coord0[i + 1]);
LineSegment seg1 = new LineSegment(coord1[j], coord1[j + 1]);
Coordinate[] closestPt = seg0.ClosestPoints(seg1);
locGeom[0] = new GeometryLocation(line0, i, new Coordinate(closestPt[0]));
locGeom[1] = new GeometryLocation(line1, j, new Coordinate(closestPt[1]));
}
if (_minDistance <= _terminateDistance) return;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="lines0"></param>
/// <param name="lines1"></param>
/// <param name="locGeom"></param>
private void ComputeMinDistanceLines(IList lines0, IList lines1, GeometryLocation[] locGeom)
{
for (int i = 0; i < lines0.Count; i++)
{
LineString line0 = (LineString)lines0[i];
for (int j = 0; j < lines1.Count; j++)
{
LineString line1 = (LineString)lines1[j];
ComputeMinDistance(line0, line1, locGeom);
if (_minDistance <= _terminateDistance) return;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="points0"></param>
/// <param name="points1"></param>
/// <param name="locGeom"></param>
private void ComputeMinDistancePoints(IList points0, IList points1, GeometryLocation[] locGeom)
{
for (int i = 0; i < points0.Count; i++)
{
Point pt0 = (Point)points0[i];
for (int j = 0; j < points1.Count; j++)
{
Point pt1 = (Point)points1[j];
double dist = pt0.Coordinate.Distance(pt1.Coordinate);
if (dist < _minDistance)
{
_minDistance = dist;
// this is wrong - need to determine closest points on both segments!!!
locGeom[0] = new GeometryLocation(pt0, 0, pt0.Coordinate);
locGeom[1] = new GeometryLocation(pt1, 0, pt1.Coordinate);
}
if (_minDistance <= _terminateDistance) return;
}
}
}
/// <summary>
///
/// </summary>
private void ComputeLineDistance()
{
GeometryLocation[] locGeom = new GeometryLocation[2];
/*
* Geometries are not wholely inside, so compute distance from lines and points
* of one to lines and points of the other
*/
IList lines0 = LinearComponentExtracter.GetLines(_geom[0]);
IList lines1 = LinearComponentExtracter.GetLines(_geom[1]);
IList pts0 = PointExtracter.GetPoints(_geom[0]);
IList pts1 = PointExtracter.GetPoints(_geom[1]);
// bail whenever minDistance goes to zero, since it can't get any less
ComputeMinDistanceLines(lines0, lines1, locGeom);
UpdateMinDistance(locGeom, false);
if (_minDistance <= _terminateDistance) return;
locGeom[0] = null;
locGeom[1] = null;
ComputeMinDistanceLinesPoints(lines0, pts1, locGeom);
UpdateMinDistance(locGeom, false);
if (_minDistance <= _terminateDistance) return;
locGeom[0] = null;
locGeom[1] = null;
ComputeMinDistanceLinesPoints(lines1, pts0, locGeom);
UpdateMinDistance(locGeom, true);
if (_minDistance <= _terminateDistance) return;
locGeom[0] = null;
locGeom[1] = null;
ComputeMinDistancePoints(pts0, pts1, locGeom);
UpdateMinDistance(locGeom, false);
}
/// <summary>
///
/// </summary>
/// <param name="ptLoc"></param>
/// <param name="poly"></param>
/// <param name="locPtPoly"></param>
private void ComputeInside(GeometryLocation ptLoc, IGeometry poly, GeometryLocation[] locPtPoly)
{
Coordinate pt = ptLoc.Coordinate;
if (Locations.Exterior == _ptLocator.Locate(pt, poly)) return;
_minDistance = 0.0;
locPtPoly[0] = ptLoc;
GeometryLocation locPoly = new GeometryLocation(poly, pt);
locPtPoly[1] = locPoly;
return;
}
/// <summary>
///
/// </summary>
/// <param name="locs"></param>
/// <param name="polys"></param>
/// <param name="locPtPoly"></param>
private void ComputeInside(IList locs, IList polys, GeometryLocation[] locPtPoly)
{
for (int i = 0; i < locs.Count; i++)
{
GeometryLocation loc = (GeometryLocation)locs[i];
for (int j = 0; j < polys.Count; j++)
{
Polygon poly = (Polygon)polys[j];
ComputeInside(loc, poly, locPtPoly);
if (_minDistance <= _terminateDistance)
return;
}
}
}
/// <summary>
///
/// </summary>
private void ComputeContainmentDistance()
{
IList polys0 = PolygonExtracter.GetPolygons(_geom[0]);
IList polys1 = PolygonExtracter.GetPolygons(_geom[1]);
GeometryLocation[] locPtPoly = new GeometryLocation[2];
// test if either point is wholely inside the other
if (polys1.Count > 0)
{
IList insideLocs0 = ConnectedElementLocationFilter.GetLocations(_geom[0]);
ComputeInside(insideLocs0, polys1, locPtPoly);
if (_minDistance <= _terminateDistance)
{
_minDistanceLocation[0] = locPtPoly[0];
_minDistanceLocation[1] = locPtPoly[1];
return;
}
}
if (polys0.Count > 0)
{
IList insideLocs1 = ConnectedElementLocationFilter.GetLocations(_geom[1]);
ComputeInside(insideLocs1, polys0, locPtPoly);
if (_minDistance <= _terminateDistance)
{
// flip locations, since we are testing geom 1 VS geom 0
_minDistanceLocation[0] = locPtPoly[1];
_minDistanceLocation[1] = locPtPoly[0];
return;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="locGeom"></param>
/// <param name="flip"></param>
private void UpdateMinDistance(GeometryLocation[] locGeom, bool flip)
{
// if not set then don't update
if (locGeom[0] == null)
return;
if (flip)
{
_minDistanceLocation[0] = locGeom[1];
_minDistanceLocation[1] = locGeom[0];
}
else
{
_minDistanceLocation[0] = locGeom[0];
_minDistanceLocation[1] = locGeom[1];
}
}