#include <iostream>
#include <winbgim.h>
#include <graphics.h>
#include <cmath>
#define XMAX 800
#define YMAX 600
#define midX XMAX/2
#define midY YMAX/2
using namespace std;
#define pi 3.14159265359
void square(int x,int y,int lat)
{

    int l2=lat/2,x1,x2,y1,y2;
    x1=x-l2;
    x2=x+l2;
    y1=y-l2;
    y2=y+l2;
    line(x1,y1,x2,y1);
    line(x2,y1,x2,y2);
    line(x2,y2,x1,y2);
    line(x1,y2,x1,y1);

}
void square_rec(int x,int y,int lat)
{
    int l=lat/2;
    if(lat>=4)
    {
        square(x,y,lat);
        square_rec(x-l,y-l,l);
        square_rec(x+l,y-l,l);
        square_rec(x-l,y+l,l);
        square_rec(x+l,y+l,l);
        Sleep(1);

    }
}
void pentagon(int n,int xc,int yc,int r)
{
    int prevx=xc+r,prevy=yc,nextx,nexty;
    double alfa, beta;
    alfa=(2*pi)/n;
    for(int i=1;i<=n;i++)
    {
        beta=i*alfa;
        nextx=xc+r*cos(beta);
        nexty=yc+r*sin(beta);
        line(prevx,prevy,nextx,nexty);
        prevx=nextx;
        prevy=nexty;
    }
}
void pentagon_rec(int x,int y,int lat)
{
    int l=lat/2;
    if(lat>=8)
    {
        //square(x,y,lat);
        pentagon(12,x,y,lat);
        pentagon_rec(x-l,y-l,l);
        pentagon_rec(x+l,y-l,l);
        pentagon_rec(x-l,y+l,l);
        pentagon_rec(x+l,y+l,l);
        Sleep(10);

    }
}
void pentagon_Fromi()
{
    for(int i=6;i<=50;i++)
    {
        clearviewport();
        pentagon(i,400,300,200);
        Sleep(100);
    }
}
void circle_rec()
{
    for(int i=200;i>=5;i-=5)
        {
            circle(400,300,i);
            Sleep(75);
        }
}
void stea(int n,int xc,int yc,int r)
{
    int prevx=xc+r,prevy=yc,nextx,nexty;
    double alfa, beta;
    alfa=(2*pi)/n;
    for(int i=1;i<=n;i++)
    {
        if(i%2==0)
        {
        beta=i*alfa;
        nextx=xc+r*cos(beta);
        nexty=yc+r*sin(beta);
        line(prevx,prevy,nextx,nexty);
        prevx=nextx;
        prevy=nexty;
        }
        else
        {
        beta=i*alfa;
        nextx=xc+(r/2)*cos(beta);
        nexty=yc+(r/2)*sin(beta);
        line(prevx,prevy,nextx,nexty);
        prevx=nextx;
        prevy=nexty;

        }
    }
}
void stea_fractal()
{
    for(int i=2;i<=100;i+=2)
    {
        clearviewport();
        stea(i,midX,midY,200);
        Sleep(200);
    }
}
void colour_cirlce()
{
    fillellipse(midX,midY,200,200);
    circle(midX,midY,200);
}
int main()
{
    //int midX=XMAX/2,midY=YMAX/2;
    initwindow(XMAX,YMAX);
    pentagon(8,midX,midY,200);
    outtextxy(midX-30,midY-10,"ENJOY");
    Sleep(1000);
    clearviewport();
    circle_rec();
    Sleep(100);
    clearviewport();
    square_rec(midX,midY,200);
    Sleep(1000);
    clearviewport();
    pentagon_rec(midX,midY,200);
    Sleep(100);
    clearviewport();
    pentagon_Fromi();
    clearviewport();
    stea_fractal();
    Sleep(100);
    clearviewport();
    outtextxy(midX-30,midY-10,"THE END");
    Sleep(2000);
    getch();
    closegraph();
}