Marlin Rowley wrote:
>  When you say "rubber-banding" what do you mean?

The kind of thing you are drawing with your red rectangle is called 
"rubber banding", because it looks something like stretching a rubber 
band (or elastic band) over the desktop image.


>  If I take the XOR away, I get the rectangle redrawing over itself 
>  continuously as I draw out a rectangle.

Right.  However, if you check out applications like Photoshop and GIMP, 
you'll see that their rubber bands DO vary in color based on the 
background.  For example, consider what will happen with your red 
rectangle if you try to drag a selection across an image that is mostly 
red.  Your rectangle will disappear.  By using XOR, you are guaranteed 
to get a rectangle that shows up with good contrast against the image 
background.


>  Are you saying that as I:
>   
>  event.Dragging() and even.LeftIsDown():
>     # Refresh the background with the bitmap
>     # draw a solid rectangle

Yes, if you really don't want XOR.  As an optimization, you would want 
to make sure that you don't redraw everything unless the coordinates of 
the rectangle really have changed.

-- 
Tim Roberts, timr@[...].com
Providenza & Boekelheide, Inc.

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