Coordinate LengthIndexedLine::extractPoint(double index, double offsetDistance) const
{
LinearLocation loc = LengthLocationMap::getLocation(linearGeom, index);
Coordinate ret;
loc.getSegment(linearGeom)->pointAlongOffset(loc.getSegmentFraction(), offsetDistance, ret);
return ret;
}
double LengthLocationMap::getLength(const LinearLocation& loc) const
{
double totalLength = 0.0;
LinearIterator it(linearGeom);
while (it.hasNext())
{
if (! it.isEndOfLine())
{
Coordinate p0 = it.getSegmentStart();
Coordinate p1 = it.getSegmentEnd();
double segLen = p1.distance(p0);
// length falls in this segment
if (loc.getComponentIndex() == it.getComponentIndex()
&& loc.getSegmentIndex() == it.getVertexIndex())
{
return totalLength + segLen * loc.getSegmentFraction();
}
totalLength += segLen;
}
it.next();
}
return totalLength;
}
unsigned int LinearIterator::segmentEndVertexIndex(const LinearLocation& loc)
{
if (loc.getSegmentFraction() > 0.0)
return loc.getSegmentIndex() + 1;
return loc.getSegmentIndex();
}