/// <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;
}
var coord0 = line0.Coordinates;
var coord1 = line1.Coordinates;
// brute force approach!
for (var i = 0; i < coord0.Length - 1; i++)
{
for (var j = 0; j < coord1.Length - 1; j++)
{
var dist = DistanceComputer.SegmentToSegment(
coord0[i], coord0[i + 1],
coord1[j], coord1[j + 1]);
if (dist < _minDistance)
{
_minDistance = dist;
var seg0 = new LineSegment(coord0[i], coord0[i + 1]);
var seg1 = new LineSegment(coord1[j], coord1[j + 1]);
var closestPt = seg0.ClosestPoints(seg1);
locGeom[0] = new GeometryLocation(line0, i, closestPt[0]);
locGeom[1] = new GeometryLocation(line1, j, closestPt[1]);
}
if (_minDistance <= _terminateDistance)
{
return;
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="line"></param>
/// <param name="pt"></param>
/// <param name="locGeom"></param>
private void ComputeMinDistance(ILineString line, IPoint pt, GeometryLocation[] locGeom)
{
if (line.EnvelopeInternal.Distance(pt.EnvelopeInternal) > _minDistance)
{
return;
}
Coordinate[] coord0 = line.Coordinates;
Coordinate coord = pt.Coordinate;
// brute force approach!
for (int i = 0; i < coord0.Length - 1; i++)
{
double dist = DistanceComputer.PointToSegment(coord, coord0[i], coord0[i + 1]);
if (dist < _minDistance)
{
_minDistance = dist;
LineSegment seg = new LineSegment(coord0[i], coord0[i + 1]);
Coordinate segClosestPoint = seg.ClosestPoint(coord);
locGeom[0] = new GeometryLocation(line, i, segClosestPoint);
locGeom[1] = new GeometryLocation(pt, 0, coord);
}
if (_minDistance <= _terminateDistance)
{
return;
}
}
}
private void ComputeContainmentDistance(GeometryLocation ptLoc,
IPolygon poly,
GeometryLocation[] locPtPoly)
{
var pt = ptLoc.Coordinate;
// if pt is not in exterior, distance to geom is 0
if (Location.Exterior != _ptLocator.Locate(pt, poly))
{
_minDistance = 0.0;
locPtPoly[0] = ptLoc;
locPtPoly[1] = new GeometryLocation(poly, pt);
}
}
private void ComputeContainmentDistance(IList <GeometryLocation> locs, ICollection <IGeometry> polys, GeometryLocation[] locPtPoly)
{
for (int i = 0; i < locs.Count; i++)
{
GeometryLocation loc = locs[i];
foreach (IPolygon t in polys)
{
ComputeContainmentDistance(loc, t, locPtPoly);
if (_minDistance <= _terminateDistance)
{
return;
}
}
}
}
/*
* /// <summary>
* ///
* /// </summary>
* /// <param name="locs"></param>
* /// <param name="polys"></param>
* /// <param name="locPtPoly"></param>
* private void ComputeInside(IEnumerable<GeometryLocation> locs, IEnumerable<IPolygon> polys, GeometryLocation[] locPtPoly)
* {
* foreach (GeometryLocation loc in locs)
* {
* foreach (IPolygon poly in polys)
* {
* ComputeInside(loc, poly, locPtPoly);
* if (_minDistance <= _terminateDistance)
* return;
* }
* }
* }
*
* /// <summary>
* ///
* /// </summary>
* /// <param name="ptLoc"></param>
* /// <param name="poly"></param>
* /// <param name="locPtPoly"></param>
* private void ComputeInside(GeometryLocation ptLoc, IPolygon poly, GeometryLocation[] locPtPoly)
* {
* Coordinate pt = ptLoc.Coordinate;
* // if pt is not in exterior, distance to geom is 0
* if (Location.Exterior != _ptLocator.Locate(pt, poly))
* {
* _minDistance = 0.0;
* locPtPoly[0] = ptLoc;
* GeometryLocation locPoly = new GeometryLocation(poly, pt);
* locPtPoly[1] = locPoly;
* return;
* }
* }
*
*/
/// <summary>
/// Computes distance between facets (lines and points) of input geometries.
/// </summary>
private void ComputeFacetDistance()
{
var 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
*/
var lines0 = LinearComponentExtracter.GetLines(_geom[0]);
var lines1 = LinearComponentExtracter.GetLines(_geom[1]);
var pts0 = PointExtracter.GetPoints(_geom[0]);
var pts1 = PointExtracter.GetPoints(_geom[1]);
// exit whenever minDistance goes LE than terminateDistance
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>
private void ComputeContainmentDistance()
{
var locPtPoly = new GeometryLocation[2];
ComputeContainmentDistance(0, locPtPoly);
if (_minDistance <= _terminateDistance)
{
return;
}
ComputeContainmentDistance(1, locPtPoly);
// test if either geometry has a vertex inside the other
/*
* IList<IPolygon> polys1 = PolygonExtracter.GetPolygons(_geom[1]);
* if (polys1.Count > 0)
* {
* IList<GeometryLocation> insideLocs0 = ConnectedElementLocationFilter.GetLocations(_geom[0]);
* ComputeInside(insideLocs0, polys1, locPtPoly);
* if (_minDistance <= _terminateDistance)
* {
* _minDistanceLocation[0] = locPtPoly[0];
* _minDistanceLocation[1] = locPtPoly[1];
* return;
* }
* }
*
* IList<IPolygon> polys0 = PolygonExtracter.GetPolygons(_geom[0]);
* if (polys0.Count > 0)
* {
* IList<GeometryLocation> 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="points0"></param>
/// <param name="points1"></param>
/// <param name="locGeom"></param>
private void ComputeMinDistancePoints(IEnumerable <IGeometry> points0, ICollection <IGeometry> points1, GeometryLocation[] locGeom)
{
foreach (IPoint pt0 in points0)
{
foreach (IPoint pt1 in points1)
{
var dist = pt0.Coordinate.Distance(pt1.Coordinate);
if (dist < _minDistance)
{
_minDistance = dist;
locGeom[0] = new GeometryLocation(pt0, 0, pt0.Coordinate);
locGeom[1] = new GeometryLocation(pt1, 0, pt1.Coordinate);
}
if (_minDistance <= _terminateDistance)
{
return;
}
}
}
}
