/// <summary>
/// Checks that two geometries are at least a minimum distance apart.
/// </summary>
/// <param name="g1">A geometry</param>
/// <param name="g2">A geometry</param>
/// <param name="minDist">The minimum distance the geometries should be separated by</param>
private void CheckMinimumDistance(Geometry g1, Geometry g2, double minDist)
{
var distOp = new DistanceOp(g1, g2, minDist);
_minDistanceFound = distOp.Distance();
if (_minDistanceFound < minDist)
{
_isValid = false;
var pts = distOp.NearestPoints();
_errorLocation = pts[1];
_errorIndicator = g1.Factory.CreateLineString(pts);
_errMsg = "Distance between buffer curve and input is too small "
+ "(" + _minDistanceFound
+ " at " + WKTWriter.ToLineString(pts[0], pts[1]) + " )";
}
}
private void DoNearestPointsTest(string wkt0, string wkt1, double distance,
Coordinate p0, Coordinate p1)
{
var op = new DistanceOp(new WKTReader().Read(wkt0), new WKTReader().Read(wkt1));
double tolerance = 1E-10;
Assert.AreEqual(distance, op.NearestPoints()[0].Distance(op.NearestPoints()[1]), tolerance);
Assert.AreEqual(p0.X, op.NearestPoints()[0].X, tolerance);
Assert.AreEqual(p0.Y, op.NearestPoints()[0].Y, tolerance);
Assert.AreEqual(p1.X, op.NearestPoints()[1].X, tolerance);
Assert.AreEqual(p1.Y, op.NearestPoints()[1].Y, tolerance);
}
/**
* verbindet die zwei Linien bei den nähesten Punkten der Linien:
* erster Teil it Anfang der Linie <code>line0</code> bis zum (ersten) nähesten Punkt zu <code>line1</code>
* zweitert Teilverbindet die zwei nähesten Punkte
* dritter Teil ist der Endteil von <code>line1</code> ab dem nähesten Punkt
* @param line0
* @param line1
* @return
*/
private static List <Coordinate> concat(ILineString line0, ILineString line1)
{
List <Coordinate> listCoords = new List <Coordinate>();
IGeometry intersection = line0.Intersection(line1);
LengthIndexedLine lil0 = new LengthIndexedLine(line0);
LengthIndexedLine lil1 = new LengthIndexedLine(line1);
Coordinate[] closestPoints = DistanceOp.NearestPoints(line0, line1);
if (!intersection.IsEmpty)
{ // die 2 Linien kreuzen sich
double maxPos = 0;
for (int i = 0; i < intersection.NumPoints; i++)
{ // den letzten Schnittpunkt suchen
Coordinate crossPoint = intersection.Coordinates[i];
double pos = lil0.Project(crossPoint);
if (maxPos < pos)
{
maxPos = pos;
closestPoints[0] = crossPoint;
closestPoints[1] = crossPoint;
}
}
}
for (int i = 0; i < line0.Coordinates.Length; i++)
{
if (lil0.Project(line0.Coordinates[i]) < lil0.Project(closestPoints[0]))
{
listCoords.Add(line0.Coordinates[i]);
}
}
listCoords.Add(closestPoints[0]);
if (closestPoints[0] != closestPoints[1])
{ // die 2 Linien kreuzen sich nicht
listCoords.Add(closestPoints[1]);
}
for (int i = 0; i < line1.Coordinates.Length; i++)
{
if (lil1.Project(line1.Coordinates[i]) > lil1.Project(closestPoints[1]))
{
listCoords.Add(line1.Coordinates[i]);
}
}
return(listCoords);
}
private void HandleIntersectionCase(GpxProlongerExecutorInput input, SegmentWithLines segment, List <ILineString> linesToProlong)
{
var intersection = segment.Start.Line.Intersection(segment.End.Line).Coordinates
.OrderBy(c => c.Distance(segment.Start.Coordinate) + c.Distance(segment.End.Coordinate)).FirstOrDefault();
if (intersection == null)
{
var distance = new DistanceOp(segment.Start.Line, segment.End.Line);
intersection = distance.NearestPoints().First();
}
var currentLengthIndexedLine = new LengthIndexedLine(segment.Start.Line);
var closestCoordinateCurrentIndex = currentLengthIndexedLine.Project(segment.Start.Coordinate);
var closestCoordinateCurrentIntersectionIndex = currentLengthIndexedLine.Project(intersection);
var currentSegment =
currentLengthIndexedLine.ExtractLine(closestCoordinateCurrentIndex, closestCoordinateCurrentIntersectionIndex);
var nextLengthIndexedLine = new LengthIndexedLine(segment.End.Line);
var closestCoordinateNextIndex = nextLengthIndexedLine.Project(segment.End.Coordinate);
var closestCoordinateNextIntersectionIndex = nextLengthIndexedLine.Project(intersection);
var nextSegment =
nextLengthIndexedLine.ExtractLine(closestCoordinateNextIntersectionIndex, closestCoordinateNextIndex);
var coordinates = currentSegment.Coordinates.Concat(nextSegment.Coordinates)
.Concat(new[] { currentSegment.Coordinates.First() }).ToArray();
if (coordinates.Length < 4)
{
return;
}
var polygon = new Polygon(new LinearRing(coordinates));
if (polygon.Area < input.MinimalAreaSize)
{
return;
}
var currentCoordinate = currentLengthIndexedLine.ExtractPoint(closestCoordinateCurrentIndex);
var nextCoordinate = nextLengthIndexedLine.ExtractPoint(closestCoordinateNextIndex);
var line = CreateLineString(currentCoordinate, segment.OriginalCoordinates, nextCoordinate);
linesToProlong.Add(line);
}
/// <summary>
///
/// </summary>
/// <param name="wktA"></param>
/// <param name="wktB"></param>
public virtual void FindClosestPoint(string wktA, string wktB)
{
Console.WriteLine("-------------------------------------");
try
{
var A = wktRdr.Read(wktA);
var B = wktRdr.Read(wktB);
Console.WriteLine("Geometry A: " + A);
Console.WriteLine("Geometry B: " + B);
var distOp = new DistanceOp(A, B);
double distance = distOp.Distance();
Console.WriteLine("Distance = " + distance);
var closestPt = distOp.NearestPoints();
var closestPtLine = fact.CreateLineString(closestPt);
Console.WriteLine("Closest points: " + closestPtLine + " (distance = " + closestPtLine.Length + ")");
}
catch (Exception ex)
{
Console.WriteLine(ex.StackTrace);
}
}
public static IGeometry nearestPoints(IGeometry a, IGeometry b)
{
var pts = DistanceOp.NearestPoints(a, b);
return(a.Factory.CreateLineString(pts));
}
