Re: Claw & Bitmaps

[tmoran@acm.org]

>there's always this parameter On_Canvas of type Root_Canvas_Type'Class,
  You don't just draw things in Windows.  You have to wait to be asked.
Create a window type, overiding When_Draw, then open a window of that
type.  Your When_Draw routine will be called whenever the window needs
to be drawn.  Notice the Basic_Canvas_Type'class parameter.  That's what
you pass, along with your bitmap, to Copy_To_Canvas to actually make the
bitmap show up on the CRT.  Similarly for Set_Pixel.  Think of the
window as glass, and the canvas as the actual surface behind the glass
that has the picture.