libre

           if (first)
            {
                if (originalPolyline->isClosed()){
                    if (prevEntity->rtti()==RS2::EntityArc) {
                        prevEntity = calculateOffset(&arcFirst, prevEntity, dist*num*neg);
                        //bulge = arcFirst.getBulge(); <<- bulge of last entity is used to draw first entity
                                                     //    if last entity arc first entity line, line is drawn as arc
                    } else {
                        bulge = 0.0;
                        prevEntity = calculateOffset(&lineFirst, prevEntity, dist*num*neg);
                    }
                    v = calculateIntersection(prevEntity, currEntity);
                }
                if (!v.valid)
                    v = currEntity->getStartpoint();
                first = false;
            }