PolylineTest

void PolylineTest() {
        {
            Polyline().Render(cout);
            cout << "endl";
        } {
            Polyline().AddPoint({20, 20}).Render(cout);
            cout << "endl";
        } {

            Polyline().AddPoint({20, 20}).AddPoint({10, 15}).Render(cout);
            cout << "endl";
        } {
            Polyline().AddPoint({20, 20}).AddPoint({10, 15}).AddPoint({0, 10}).Render(cout);
        }
    }

<polyline points="" />
endl<polyline points="20,20" />
endl<polyline points="20,20 10,15" />
endl<polyline points="20,20 10,15 0,10" />