duck->set_name(strprintf("%x-vertex",bline_point_list.front().get()));
duck->signal_edited().connect(
sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_vertex_change),bline_point_list.front())
duck->set_name(strprintf("%x-vertex",bline_point_list.front().get()));
duck->signal_edited().connect(
sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_vertex_change),bline_point_list.front())