# arc class [fltk]

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 13 Exercise 1
Using GUI library called FLTK (Fast Light Tool Kit, “full tick”).

```Output:

```

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 13 Exercise 1

#define _USE_MATH_DEFINES
#include "Simple_window.h"
#include "Graph.h"
#include <cmath>
using namespace Graph_lib;

class MyArc : public Shape
{
Point center;
float start;
float end;

public:
MyArc(Point c, double r, double s, double e)
: center(c)
, start(s)
, end(e)
{
};

void draw_lines() const;
};

void MyArc::draw_lines() const
{
int h = w;
if (color().visibility()) {
fl_arc(point(0).x, point(0).y, w, h, start, end);
}
}

int main()
try
{
Point tl(100, 100);
Simple_window win(tl, 600, 400, "Simple Window");

MyArc arc(Point(100, 100), 50.0, 30.0, 180.0);
arc.set_color(Color::red);
win.attach(arc);

win.wait_for_button();
}
catch (exception& e) {
cout << e.what() << endl;
return 1;
}
catch (…) {
cout << "Exiting" << endl;
return 2;
}
[/code]