-void MTPGraph::print_dot() {
- cout << "digraph {" << endl;
- cout << " node[shape=circle];" << endl;
+void MTPGraph::print_dot(ostream *os) {
+ (*os) << "digraph {" << endl;
+ // (*os) << " node [shape=circle];" << endl;
+ (*os) << " " << _source->id << " [peripheries=2];" << endl;
+ (*os) << " " << _sink->id << " [peripheries=2];" << endl;