filling a rectangle with stripes [fltk]

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 14 Exercise 5
Using GUI library called FLTK (Fast Light Tool Kit, “full tick”).

```Output:

```
```//  Philipp Siedler
//  Bjarne Stroustrup's PP
//  Chapter 14 Exercise 5

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

Point operator+(Point& p1, Point& p2) {
Point p3 = Point(p1.x + p2.x, p1.y + p2.y);
return p3;
}

class Striped_rectangle : public Rectangle
{
public:
Striped_rectangle(Point a, Point b)
:Rectangle(a, b), a(a), b(b)
{
Rectangle::set_color(Color::red);
set_fill_color();
}

void set_fill_color();
void draw_lines() const;

private:
Point a;
Point b;
Lines pattern;
};

void Striped_rectangle::set_fill_color()
{
double delta = abs(a.y - b.y);
for (int i = 0; i < delta; i += 5) {
pattern.add(Point(a.x, a.y + i), Point(b.x, a.y + i));
}
pattern.set_color(Color::blue);
}

void Striped_rectangle::draw_lines() const
{
pattern.draw();
Rectangle::draw_lines();
}

int main()
try
{
Point tl(100, 100);
Simple_window win(tl, 720, 400, "Simple Window");
Point center(win.x_max() / 2, win.y_max() / 2);

Striped_rectangle rec(center, center + Point(200, 100));

win.attach(rec);
win.wait_for_button();
}
catch (exception& e) {
cout << e.what() << endl;
return 1;
}
catch (...) {
cout << "Exiting" << endl;
return 2;
}
```

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