addPoint method
Add a Point to the graph.
Implementation
void addPoint(Point p) {
// a zero or negative width buffer of a line/point is empty
if (distance <= 0.0) return;
List<Coordinate> coord = p.getCoordinates();
List<Coordinate>? curve = curveBuilder.getLineCurve(coord, distance);
addCurve(curve, Location.EXTERIOR, Location.INTERIOR);
}