protected override Coordinate ExtractOffsetAt(IGeometry linearGeom, Coordinate testPt, double offsetDistance)
{
LengthIndexedLine indexedLine = new LengthIndexedLine(linearGeom);
double index = indexedLine.IndexOf(testPt);
return indexedLine.ExtractPoint(index, offsetDistance);
}
protected override bool IndexOfAfterCheck(IGeometry linearGeom, Coordinate testPt)
{
LengthIndexedLine indexedLine = new LengthIndexedLine(linearGeom);
// check locations are consecutive
double loc1 = indexedLine.IndexOf(testPt);
double loc2 = indexedLine.IndexOfAfter(testPt, loc1);
if (loc2 <= loc1) return false;
// check extracted points are the same as the input
Coordinate pt1 = indexedLine.ExtractPoint(loc1);
Coordinate pt2 = indexedLine.ExtractPoint(loc2);
if (!pt1.Equals2D(testPt)) return false;
if (!pt2.Equals2D(testPt)) return false;
return true;
}