vanishing a model in SDL 1.2

Question

How i can vanish a model or a change a background in the middle of the program.i try to disappear with SDL_FreeSurface( dot ); but i did not work.so how i can vanish a model and load another model.i try this but no success.

void clean_up()
{
    SDL_FreeSurface( model );
}

while( quit == false )
    {

        while( SDL_PollEvent( &event ) )
        {

            if( event.type == SDL_MOUSEBUTTONDOWN )
            {
                  clean_up();
            }
        }
    }

i think that SDL_FreeSurface just free the model in memory not in screen. and hows about

Answer 1

SDL1.2 is outdated please use SDL2. Anyways for the solution

After you free the surface in the function, add model = NULL; , and blit the surface every while loop cycle by adding a SDL_Flip(model) at the end of your while loop, this will make your pointer point to nothing which will show nothing (aka vanish), but if you are literally talking about vanishing, you could reduce the alpha by 1 (or whatever your jazz is) in a for loop which will make it fade out like it is vanishing,