08-28-2010, 02:06 PM
The reason for that is that the part that was there was 480 wide and the new part is 480 tall. It doesn't know that you don't have enough to display both of those, and, if you did, you would want to clear the area out to the right, so it's background filled and that's why you get that part included in the full redrawn area.
As a general rule you can always clip any output that you are asked to draw to your actual drawing area if that makes things more efficient, i.e. because some things won't actually get drawn.
As a general rule you can always clip any output that you are asked to draw to your actual drawing area if that makes things more efficient, i.e. because some things won't actually get drawn.
Dean Roddey
Explorans limites defectum
Explorans limites defectum