Pixel isn't drawn

[Piru]

and in the cleanup function:

Code: [Select]

void clean_up(void)
{
 
    /* If thw window is open, close it */
    if(GameWindow != NULL)
    {
        CloseWindow(GameWindow);
    }
 
    /* If the intuition.library is open, close it */
    if(IntuitionBase != NULL)
    {
        CloseLibrary((struct Library *)IntuitionBase);
    }
 
    /* If the graphics.library is open, close it */
    if(GfxBase != NULL)
    {
        CloseLibrary((struct Library *)GfxBase);
    }

    ReleasePen(GameWindow->WScreen->ViewPort.ColorMap, blue);
 
    return;
}


You're referencing a dangling pointer here. GameWindow is a pointer to released memory (CloseWindow() has already released the memory at this point). Thus you will get a random WScreen pointer and further pain.

Depending on your luck it might crash only occasionally. It much depends on how busy your system is.