# rectangle extremes [fltk]

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 13 Exercise 4
Using GUI library called FLTK (Fast Light Tool Kit, “full tick”).

```Output:

```

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 13 Exercise 4

#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;
}

Point ne(Graph_lib::Rectangle& rect) {
return rect.point(0);
}

Point n(Graph_lib::Rectangle& rect) {
Point originPt = rect.point(0);
return Point(originPt.x + rect.width() / 2, originPt.y);
}

Point nw(Graph_lib::Rectangle& rect) {
Point originPt = rect.point(0);
return Point(originPt.x + rect.width(), originPt.y);
}

Point w(Graph_lib::Rectangle& rect) {
Point originPt = rect.point(0);
return Point(originPt.x + rect.width(), originPt.y + rect.height() / 2);
}

Point sw(Graph_lib::Rectangle& rect) {
Point originPt = rect.point(0);
return Point(originPt.x + rect.width(), originPt.y + rect.height());
}

Point s(Graph_lib::Rectangle& rect) {
Point originPt = rect.point(0);
return Point(originPt.x + rect.width() / 2, originPt.y + rect.height());
}

Point se(Graph_lib::Rectangle& rect) {
Point originPt = rect.point(0);
return Point(originPt.x, originPt.y + rect.height());
}

Point e(Graph_lib::Rectangle& rect) {
Point originPt = rect.point(0);
return Point(originPt.x, originPt.y + rect.height() / 2);
}

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

Graph_lib::Rectangle testRect(Point(100,100), Point(300,200));
testRect.set_color(Color::red);

Point myPoint = n(testRect);
Mark myMark(myPoint, ‘x’);
myMark.set_color(Color::blue);
cout << myPoint << endl;

win.attach(testRect);
win.attach(myMark);

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