polygon try 2

#include "primlib.h"
#include <stdlib.h>
#define PI 3.141592653589
#define angle_of_rotation M_PI/80
#define verticles 5

int min (int a, int b)
{
    if(a < b)
        return a;
    return b;
}
int main(int argc, char* argv[])
{
    int i ;

    if(initGraph())
    {

        exit(3);
    }


    int radious = 10;
    int temp = 20;
    double rotation = 0 ;
    double polygonAngle = (2*M_PI)/ verticles;


    double origin_x = screenWidth() / 2;
    double origin_y = screenHeight() / 2;

    double start_x;
    double start_y;

    double stop_x;
    double stop_y;

    while(1)
    {

        filledRect(0, 0, screenWidth() - 1, screenHeight() - 1, BLACK);

        int maxRadious = (int)(min(screenWidth(), screenHeight())/2);
        temp = (temp + 1) % (2 * maxRadious);
        if (temp < maxRadious)
        {
            radious = temp;
        }
        else
        {
            radious = maxRadious - temp % maxRadious;
        }

        if (rotation + angle_of_rotation >= 2* PI)
        {
            rotation = 0;
        }


        rotation = (rotation + angle_of_rotation) ;


        for (i = 0; i < verticles;  i++)
        {
            start_x = origin_x + radious * cos(polygonAngle* i + rotation);
            start_y = origin_y + radious * sin(polygonAngle* i + rotation);
            stop_x = origin_x + radious * cos(polygonAngle* (i + 1) + rotation);
            stop_y = origin_y + radious * sin(polygonAngle* (i + 1) + rotation);

            line(start_x, start_y, stop_x , stop_y, BLUE);

        }


        updateScreen();
        SDL_Delay(10);



        if (isKeyDown(SDLK_ESCAPE) == 1)
        {
            break;
        }


    }
    updateScreen();
    SDL_Delay(40);

    return 0;
}