[metapost] reverse clip operation
andreas.matthias at tuwien.ac.at
Wed Sep 20 12:54:03 CEST 2006
lfinsto1 at gwdg.de wrote:
Probably the term `reverse clipping' is wrong. Maybe it should
be named `inverse clipping'? I'm not sure.
[ picture: q0...red ellipse, q1...black line]
> undraw frame;
> currentpicture := q1;
> addto currentpicture also q0 withcolor white;
Your are missing the red ellipse here. Let's suppose the
red ellipse had be added to this fig as a first operation.
Then you are clipping the black line q1, but with the
penalty that your are painting (in white) over the red ellipse.
My aim would be to:
1) draw the red ellipse
2) draw (and clip) the black line
That should be all. A third operation like:
3) repaint red ellipse
should be unnecessary.
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