demo_neillsdl2.c

#include <stdio.h>
#include <stdlib.h>
#include "neillsdl2.h"

#define RECTSIZE 20
#define MILLISECONDDELAY 20

int main(void)
{

   SDL_Simplewin sw;
   SDL_Rect rectangle;
   rectangle.w = RECTSIZE;
   rectangle.h = RECTSIZE;

   Neill_SDL_Init(&sw);
   do{

      SDL_Delay(MILLISECONDDELAY);

      /* Choose a random colour, a mixture of red, green and blue. */
      Neill_SDL_SetDrawColour(&sw, rand()%SDL_8BITCOLOUR,
                                   rand()%SDL_8BITCOLOUR,
                                   rand()%SDL_8BITCOLOUR);

      /* Filled Rectangle, fixed size, random position */
      rectangle.x = rand()%(WWIDTH-RECTSIZE);
      rectangle.y = rand()%(WHEIGHT-RECTSIZE);
      SDL_RenderFillRect(sw.renderer, &rectangle);

      /* Unfilled Rectangle, fixed size, random position */
      rectangle.x = rand()%(WWIDTH-RECTSIZE);
      rectangle.y = rand()%(WHEIGHT-RECTSIZE);
      SDL_RenderDrawRect(sw.renderer, &rectangle);

      Neill_SDL_UpdateScreen(&sw);

      /* Has anyone pressed ESC or killed the SDL window ?
         Must be called frequently - it's the only way of escaping  */
      Neill_SDL_Events(&sw);

   }while(!sw.finished);

   /* Clear up graphics subsystems */
   SDL_Quit();
   atexit(SDL_Quit);

   return 0;

}