int main()
{
Simple_window win {Point{100, 100}, 800, 600, "Exercise 5"};
const Point orig {300, 300};
constexpr int x_length = 400;
constexpr int y_length = 400;
const string x_label = "1 == 20 pixels";
const string y_label = "1 == 20 pixels";
constexpr int num_notches = 20;
Axis xa {Axis::x, Point{orig.x - x_length / 2, orig.y},
x_length, num_notches, x_label};
Axis ya {Axis::y, Point{orig.x, orig.y + y_length / 2},
y_length, num_notches, y_label};
xa.set_color(Color::red);
ya.set_color(Color::red);
xa.label.move(-130, -20);
constexpr int r_min = -10;
constexpr int r_max = 11;
constexpr int num_points = 400;
constexpr double x_scale = 20;
constexpr double y_scale = 20;
win.attach(xa);
win.attach(ya);
for (int n = 1; n < 50; ++n) {
ostringstream ss;
ss << "Leibniz series approximation; n == " << n;
win.set_label(ss.str());
Function leib {[n](double x) { return leibniz(n); }, r_min, r_max, orig,
num_points, x_scale, y_scale};
win.attach(leib);
win.wait_for_button();
win.detach(leib);
}
}
