/// <summary>
/// Computes the <see cref="LineString" /> for the interval
/// on the line between the given indices.
/// If the <paramref name="endIndex" /> lies before the <paramref name="startIndex" />,
/// the computed geometry is reversed.
/// </summary>
/// <param name="startIndex"></param>
/// <param name="endIndex"></param>
/// <returns></returns>
public IGeometry ExtractLine(double startIndex, double endIndex)
{
LocationIndexedLine lil = new LocationIndexedLine(_linearGeom);
double startIndex2 = ClampIndex(startIndex);
double endIndex2 = ClampIndex(endIndex);
// if extracted line is zero-length, resolve start lower as well to ensure they are equal
bool resolveStartLower = startIndex2 == endIndex2;
LinearLocation startLoc = LocationOf(startIndex2, resolveStartLower);
// LinearLocation endLoc = locationOf(endIndex2, true);
// LinearLocation startLoc = locationOf(startIndex2);
LinearLocation endLoc = LocationOf(endIndex2);
return(ExtractLineByLocation.Extract(_linearGeom, startLoc, endLoc));
}
/// <summary>
/// Computes the <see cref="ILineString" /> for the interval
/// on the line between the given indices.
/// If the start location is after the end location,
/// the computed linear geometry has reverse orientation to the input line.
/// </summary>
/// <param name="startIndex">The index of the start of the interval.</param>
/// <param name="endIndex">The index of the end of the interval.</param>
/// <returns>The linear interval between the indices.</returns>
public IGeometry ExtractLine(LinearLocation startIndex, LinearLocation endIndex)
{
return(ExtractLineByLocation.Extract(_linearGeom, startIndex, endIndex));
}
/// <summary>
/// Computes the subline of a <see cref="ILineString" /> between
/// two <see cref="LinearLocation"/>s on the line.
/// If the start location is after the end location,
/// the computed linear geometry has reverse orientation to the input line.
/// </summary>
/// <param name="line">The line to use as the baseline.</param>
/// <param name="start">The start location.</param>
/// <param name="end">The end location.</param>
/// <returns>The extracted subline.</returns>
public static IGeometry Extract(IGeometry line, LinearLocation start, LinearLocation end)
{
var ls = new ExtractLineByLocation(line);
return(ls.Extract(start, end));
}