addPt method
Implementation
void addPt(Coordinate pt) {
Coordinate bufPt = new Coordinate.fromCoordinate(pt);
precisionModel!.makeCoordinatePrecise(bufPt);
// don't add duplicate (or near-duplicate) points
if (isRedundant(bufPt)) return;
ptList.add(bufPt);
//System.out.println(bufPt);
}