change background color in c-programming

[Piru]

@jonssonj

If your window is borderless you can just:

Code: [Select]

SetRast(win->RPort, 2);

However, if your window has borders then you need to account for them:

Code: [Select]


{
  LONG l, t, w, h;

  l = win->BorderLeft;
  t = win->BorderTop;
  w = win->Width - win->BorderLeft - win->BorderRight;
  h = win->Height - win->BorderTop - win->BorderBottom;

  if (w > 0 && h > 0)
  {
    /* White background */
    SetAPen(win->RPort, 2);
    RectFill(win->RPort, l, t, l + w - 1, t + h - 1);

    ...
  }
}


Another possibility is using WA_BackFill and custom backfill hook.

Here's slightly more complex example showing how it is possible to handle custom colour rendering on any public screen: simplewindow.c