int main() { using namespace Graph_lib; Simple_window win {Point{100, 100}, 800, 600, "Exercise 9"}; Checker ck {50}; ck.set_color(Color::green); Circle c {Point{200, 200}, 30}; c.set_color(Color::black); c.set_fill_color(Color::white); Rectangle r {Point{100, 50}, 30, 40}; r.set_color(Color::red); r.set_fill_color(Color::yellow); ck.add_shape(c); ck.add_shape(r); ck.move(0, 4, 1); ck.move(1, 5, 3); win.attach(ck); win.attach(ck.shape(0)); win.attach(ck.shape(1)); win.wait_for_button(); }