/**
* Extraction of a sub-LineString from an existing line, starting from 0;
*
* @param ls the line from which we extract the sub LineString ()
* @param fraction [0..1], the length until where we want the substring to go
* @return the sub-LineString
*/
LineString getSubLineString(LineString ls, double fraction) {
if (fraction >= 1) return ls;
LengthIndexedLine linRefLine = new LengthIndexedLine(ls);
LineString subLine = (LineString) linRefLine.extractLine(0, fraction * ls.getLength());
return subLine;
}
