public void addNextSegment(Coordinate p, boolean addStartPoint) { // s0-s1-s2 are the coordinates of the previous segment and the current one s0 = s1; s1 = s2; s2 = p; seg0.setCoordinates(s0, s1); computeOffsetSegment(seg0, side, distance, offset0); seg1.setCoordinates(s1, s2); computeOffsetSegment(seg1, side, distance, offset1); // do nothing if points are equal if (s1.equals(s2)) return; int orientation = Orientation.index(s0, s1, s2); boolean outsideTurn = (orientation == Orientation.CLOCKWISE && side == Position.LEFT) || (orientation == Orientation.COUNTERCLOCKWISE && side == Position.RIGHT); if (orientation == 0) { // lines are collinear addCollinear(addStartPoint); } else if (outsideTurn) { addOutsideTurn(orientation, addStartPoint); } else { // inside turn addInsideTurn(orientation, addStartPoint); } }