[4505] in java-interest
Clipping Rectangles
daemon@ATHENA.MIT.EDU (Elliotte Rusty Harold)
Wed Jan 3 16:02:33 1996
From: "Elliotte Rusty Harold" <elliotte@blackstar.com>
To: java-interest@java.sun.com
Date: Wed, 3 Jan 1996 15:05:02 EST
Reply-To: elliotte@blackstar.com
A couple of weeks ago I asked how one might reset the clipping
rectangles. I haven't received any responses though I''ve seen
several other people with similar problems. Recently, however, I
figured out a solution.
Ignore Graphics.clipRect completely. It's severely flawed. Instead
create separate offscreen Images for each clipping region. Draw into
those offScreen Images and then copy them onto the appropriate
section of the of your applet window. Some coordinate conversion will
almost certainly be necessary.
If the background image isn't a simple color then you'll first need to
copy the appropriate part of that image to your offscreen clipping
Image. You can do this by drawing your background Image into your
offscreen region with Graphics.drawImage and a suitable shifting of
coordinates.
This all works for rectangular regions only since that's all we have
with an Image.
The Java AWT is really beginning to make me appreciate QuickDraw.
Other Mac programmers on this list should know what I mean.
--
Elliotte Rusty Harold Black Star Publishing Co., Inc.
elliotte@blackstar.com 116 East 27th Street
elharo@shock.njit.edu NY NY 10016
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