#include <iostream>
#include <graphics.h>
#include <math.h>

using namespace std;

#define PI 3.14159265

void drawHex(int lines, int radius, int *centerCoordinates, int color, bool filled = false, double angle = 0, bool isCircle = false)
{
    int points[lines * 2]= {0};
    int n = lines, R = radius, Xc=(*centerCoordinates++), Yc=(*centerCoordinates);
    for(int i=0; i<n; i++)
    {
        double alfa = i * 2 * PI/n + angle;
        points[2*i]   = Xc + R * cos(alfa);
        points[2*i+1] = Yc + R * sin(alfa);
    }
    points[lines * 2] = points[0];
    points[lines * 2 +1] = points[1];
    setcolor(color);
    if(filled)
    {
        fillpoly(lines+1,points);
    }
    drawpoly(lines+1,points);
}

int main()
{
    initwindow(500, 250);
    setcolor(RED);
    int centerCoordinates[2] = {getmaxx()/2, getmaxy()/2};
    int i = 1, radius = 30;
    double a=0;
    while(true)
    {
        if(kbhit())
        {
            int c = getch();
            if (c == '+')
                a+=0.1;
            else if(c == '-' && radius != 0)
            {
                a-=0.1;
            }


        }
        drawHex(4, radius, centerCoordinates, RED, true, a, true);
        cleardevice();
    }
    return 0;
}