Hexa X11

//g++ -o hexa hexa.cpp -lX11 -L/usr/X6R11/lib -l /usr/X6R11/include
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <X11/Xlib.h>
#include <assert.h>
#include <unistd.h>

#define NIL (0)

using namespace std;

int main(){

Display *dpy = XOpenDisplay(NIL);
assert(dpy);

int blackColor = BlackPixel(dpy,DefaultScreen(dpy));
int whiteColor = WhitePixel(dpy,DefaultScreen(dpy));

Window w = XCreateSimpleWindow(dpy,DefaultRootWindow(dpy),0,0,1500,1500,0,blackColor,blackColor);
XSelectInput(dpy,w,StructureNotifyMask);
XMapWindow(dpy,w);

GC gc = XCreateGC(dpy,w,0,NIL);
XSetForeground(dpy,gc,whiteColor);

for(;;){
    XEvent e;
    XNextEvent(dpy,&e);
    if(e.type == MapNotify)
        break;
}

int Ax,Ay,Bx,By,Cx,Cy,Dx,Dy,Ex,Ey,Fx,Fy,r,amount;

cout << "Ax: "; cin >> Ax; cout << endl;
cout << "Ay: "; cin >> Ay; cout << endl;
cout << "Bx: "; cin >> Bx; cout << endl;
cout << "By: "; cin >> By; cout << endl;
cout << "Cx: "; cin >> Cx; cout << endl;
cout << "Cy: "; cin >> Cy; cout << endl;
cout << "Dx: "; cin >> Dx; cout << endl;
cout << "Dy; "; cin >> Dy; cout << endl;
cout << "Ex: "; cin >> Ex; cout << endl;
cout << "Ey: "; cin >> Ey; cout << endl;
cout << "Fx: "; cin >> Fx; cout << endl;
cout << "Fy: "; cin >> Fy; cout << endl;
cout << "repetitions: "; cin >> r; cout << endl;
cout << "amount: "; cin >> amount; cout << endl;

Ax=Ax*100;
Ay=Ay*100;
Bx=By*100;
By=By*100;
Cx=Cx*100;
Cy=Cy*100;
Dx=Dx*100;
Dy=Dy*100;
Ex=Ex*100;
Ey=Ey*100;
Fx=Fx*100;
Fy=Fy*100;

amount=amount*100;

for(int i=0;i<r;i++){
    XDrawLine(dpy,w,gc,Ax,Ay,Cx,Cy);
    XDrawLine(dpy,w,gc,Cx,Cy,Dx,Dy);
    XDrawLine(dpy,w,gc,Dx,Dy,Bx,By);
    XDrawLine(dpy,w,gc,Bx,By,Ex,Ey);
    XDrawLine(dpy,w,gc,Ex,Ey,Fx,Fy);
    XDrawLine(dpy,w,gc,Fx,Fy,Ax,Ay);

    Cx=Cx+amount;
    Dx=Dx+amount;
    Ex=Ex-amount;
    Fx=Fx-amount;

    XFlush(dpy);
    sleep(1);
}
cin.ignore().get();

return 0;
}