# testing all octagon class methods [fltk]

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 14 Exercise 8
Using GUI library called FLTK (Fast Light Tool Kit, “full tick”).

```Output:

```
```//  Philipp Siedler
//  Bjarne Stroustrup's PP
//  Chapter 14 Exercise 8

#define _USE_MATH_DEFINES
#include "Simple_window.h"
#include "Graph.h"
#include <cmath>

using namespace Graph_lib;

ostream& operator<<(ostream& out, Point& a) {
out << "(" << a.x << "," << a.y << ")";
return out;
}

struct Regular_octagon : Closed_polyline
{
{
set_color(Color::red);
generate_points();
};

void draw_lines() const;

private:
Point o;
vector<Point> pts;
int r;

void generate_points();
vector<Point> get_pts() { return pts; };

};

void Regular_octagon::generate_points()
{
int n = 8;
for (int i = 0; i < n; i++) {
pts.push_back(Point(o.x + r * cos(2 * M_PI * i / n), o.y + r * sin(2 * M_PI * i / n)));
}
};

void Regular_octagon::draw_lines() const
{
Closed_polyline::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);

Regular_octagon o(center, 50);

// color();
cout << o.color().as_int() << endl; // Output: 88
cout << o.color().black << endl; // Output: 56
cout << o.color().blue << endl; // Output: 216
cout << o.color().cyan << endl; // Output: 223
cout << o.color().dark_blue << endl; // Output: 136
cout << o.color().dark_cyan << endl; // Output: 140
cout << o.color().dark_green << endl; // Output: 60
cout << o.color().dark_magenta << endl; // Output: 152
cout << o.color().dark_red << endl; // Output: 72
cout << o.color().dark_yellow << endl; // Output: 76
cout << o.color().green << endl; // Output: 63
cout << o.color().invisible << endl; // Output: 0
cout << o.color().magenta << endl; // Output: 248
cout << o.color().red << endl; // Output: 88
o.color().set_visibility(Color::Transparency(0));
o.color().visibility();

// draw();
o.draw();

// draw_lines();
o.draw_lines();

// fill_color();
cout << o.fill_color().as_int() << endl; // Output: 88
cout << o.fill_color().black << endl; // Output: 56
cout << o.fill_color().blue << endl; // Output: 216
cout << o.fill_color().cyan << endl; // Output: 223
cout << o.fill_color().dark_blue << endl; // Output: 136
cout << o.fill_color().dark_cyan << endl; // Output: 140
cout << o.fill_color().dark_green << endl; // Output: 60
cout << o.fill_color().dark_magenta << endl; // Output: 152
cout << o.fill_color().dark_red << endl; // Output: 72
cout << o.fill_color().dark_yellow << endl; // Output: 76
cout << o.fill_color().green << endl; // Output: 63
cout << o.fill_color().invisible << endl; // Output: 0
cout << o.fill_color().magenta << endl; // Output: 248
cout << o.fill_color().red << endl; // Output: 88
o.fill_color().set_visibility(Color::Transparency::invisible);
o.fill_color().set_visibility(Color::Transparency::visible);
o.fill_color().visibility();

// move();
o.move(100, -100);

// number_of_points();
cout << o.number_of_points() << endl; // Output: 8

// Open_polyline
//o.Open_polyline.add(Point(100, 100)); // typename is not allowed

// point();
cout << o.point(0) << endl; // Output: (510,100)

// set_color();
o.set_color(Color::red); // sets color to red

// set_fill_color();
o.set_fill_color(Color::cyan); // sets fill_color to cyan

// set_style();
o.set_style(Line_style(Line_style::dash, 5)); // sets line style: dashed, 5 width

// Shape
//o.Shape // typename is not allowed

// style();
cout << o.style().dash << endl; // Output: 1
cout << o.style().dashdot << endl; // Output: 3
cout << o.style().dashdotdot << endl; // Output: 4
cout << o.style().dot << endl; // Output: 2
cout << o.style().solid << endl; // Output: 0
cout << o.style().style() << endl; // Output: 1
cout << o.style().width() << endl; // Output: 5

// ~Shape
//o.~Shape // invalid destructor name for type "Regular_octagon"

win.attach(o);
win.wait_for_button();
}
catch (exception& e) {
cout << e.what() << endl;
return 1;
}
catch (...) {
cout << "Exiting" << endl;
return 2;
}
```
```Output:
88
56
216
223
136
140
60
152
72
76
63
0
248
88
0
56
216
223
136
140
60
152
72
76
63
0
248
88
8
(510,100)
1
3
4
2
0
1
5
```

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