#include <allegro.h> 

int main(int argc, char *argv[]) 
{ 
allegro_init(); 
install_keyboard(); 
set_color_depth(32); 
set_gfx_mode(GFX_AUTODETECT, 1024,768,0,0); ;
BITMAP *buffer  = create_bitmap(1024,768); 
    
int x = 0; 
int y = 0;
int r = 0;
while(!key[KEY_ESC]) 
{
if (r == 100) r = 0;
r+=1;
circlefill(buffer,1024/2,768/2,r,makecol(255, 255,0));
blit(buffer, screen, 0,0,0,0,1024,768);
clear_to_color(buffer, makecol(255, 255, 255));
}
                        
} 
END_OF_MAIN()