private bool AddSegmentToLine(ILineString line, SegmentWithLines segment, List <ILineString> linesToProlong, double minimalDistance)
{
if (linesToProlong.Contains(line) == false)
{
return(false);
}
if (line.Coordinates.Last().Distance(segment.StartProjected) < minimalDistance)
{
linesToProlong.Remove(line);
var concatLine = CreateLineString(null,
line.Coordinates.Concat(segment.OriginalCoordinates).ToArray(),
segment.EndProjected);
linesToProlong.Add(concatLine);
return(true);
}
if (line.Coordinates.First().Distance(segment.EndProjected) < minimalDistance)
{
linesToProlong.Remove(line);
var concatLine = CreateLineString(segment.StartProjected,
segment.OriginalCoordinates.Concat(line.Coordinates).ToArray(), null);
linesToProlong.Add(concatLine);
return(true);
}
return(false);
}
private void HandleTwoLinesCase(GpxProlongerExecutorInput input, SegmentWithLines segment, List <ILineString> linesToProlong)
{
var bothLinesAreInList = linesToProlong.Contains(segment.Start.Line) && linesToProlong.Contains(segment.End.Line);
if (bothLinesAreInList &&
segment.Start.Line.Coordinates.Last().Distance(segment.Start.Coordinate) < input.MinimalDistance &&
segment.End.Line.Coordinates.First().Distance(segment.End.Coordinate) < input.MinimalDistance)
{
linesToProlong.Remove(segment.Start.Line);
linesToProlong.Remove(segment.End.Line);
linesToProlong.Add(_geometryFactory.CreateLineString(
segment.Start.Line.Coordinates
.Concat(segment.OriginalCoordinates)
.Concat(segment.End.Line.Coordinates)
.Distinct()
.ToArray()));
}
else if (!AddSegmentToLine(segment.Start.Line, segment, linesToProlong, input.MinimalDistance))
{
if (!AddSegmentToLine(segment.End.Line, segment, linesToProlong, input.MinimalDistance))
{
linesToProlong.Add(CreateLineString(segment.StartProjected, segment.OriginalCoordinates, segment.EndProjected));
}
}
}
private SegmentWithLines CreateSegmentWithLines(Coordinate[] segment, LineAndCoordinate current, LineAndCoordinate next)
{
var currentLengthIndexedLine = new LengthIndexedLine(current.Line);
var currentCoordinate = currentLengthIndexedLine.ExtractPoint(currentLengthIndexedLine.Project(current.Coordinate));
var nextLengthIndexedLine = new LengthIndexedLine(next.Line);
var nextCoordinate = nextLengthIndexedLine.ExtractPoint(nextLengthIndexedLine.Project(next.Coordinate));
var segmentWithLines = new SegmentWithLines
{
OriginalCoordinates = segment,
Start = current,
StartProjected = currentCoordinate,
End = next,
EndProjected = nextCoordinate
};
return(segmentWithLines);
}
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);
}
private void HandleSelfClosingCase(GpxProlongerExecutorInput input, SegmentWithLines segment, List <ILineString> linesToProlong)
{
var lengthIndexedLine = new LengthIndexedLine(segment.Start.Line);
var closestCoordinateCurrentIndex = lengthIndexedLine.Project(segment.Start.Coordinate);
var closestCoordinateNextIndex = lengthIndexedLine.Project(segment.End.Coordinate);
var indexedSegment = lengthIndexedLine.ExtractLine(closestCoordinateCurrentIndex, closestCoordinateNextIndex);
var coordinates = indexedSegment.Coordinates.Concat(new[] { indexedSegment.Coordinates.First() }).ToArray();
if (coordinates.Length < 4)
{
return;
}
var polygon = new Polygon(new LinearRing(coordinates));
if (polygon.Area < input.MinimalAreaSize)
{
return;
}
if (!AddSegmentToLine(segment.Start.Line, segment, linesToProlong, input.MinimalDistance))
{
linesToProlong.Add(CreateLineString(segment.StartProjected, segment.OriginalCoordinates, segment.EndProjected));
}
}