#include <cstdio>
#include <climits>
#include <iostream>
#include <ctime>
#include <cmath>
#include <graphics.h>
#include <windows.h>
#include <sys/time.h>
#include <thread>

using namespace std;

const int width = 1000;
const int height = 600;


int func(int x) {
   return sin(x * 0.02) * 50;
}

int random(int min, int max) {
   return min + rand() % (max - min);
}

const int rect_count = 20;

struct rectangle
{
   int width;
   int height;
   int x, y;
} rectangles[rect_count];

int main() {
   initwindow(width, height);
   int i = 0;
   bool page = 0;

   bool fl = 1;

   srand(time(NULL));
   for(int i = 0; i < rect_count; i++) {
      rectangles[i].width = random(10, 70);
      rectangles[i].height = random(10, 70);

      rectangles[i].x = random(0, width - rectangles[i].width);
      rectangles[i].y = random(0, height - rectangles[i].height);
   }


   while (true) {
      setactivepage(page = !page);

      setfillstyle(SOLID_FILL, COLOR(47, 47, 47));
      bar(0, 0, width, height);

      setfillstyle(SOLID_FILL, COLOR(255, 0, 0));


      for(int i = 0; i < rect_count; i++) {
         if(rectangles[i].x <= 0)
            rectangles[i].x += 6;
         rectangles[i].x += random(-5, 6);
         if(rectangles[i].y <= 0)
            rectangles[i].y += 6;
         rectangles[i].y += random(-5, 6);

         rectangle(  rectangles[i].x,
                     rectangles[i].y,
                     rectangles[i].x + rectangles[i].width,
                     rectangles[i].y + rectangles[i].height);
      }

      delay(1);
      setvisualpage(page);
   }
}