[texhax] tikz and making a hole

[Victor Ivrii]

On Tue, Jun 22, 2010 at 5:36 PM, Martin Heller <mr_heller at yahoo.dk> wrote:
> \begin{tikzpicture}
> \fill[red] (1.9,1.9) circle (.5);
> \fill[blue,even odd rule] (2,2) circle (0.5) circle (1);
> \end{tikzpicture}
>

Thanks! I missed [even odd rule] switch.
I make even more holes


\fill[blue,even odd rule] (1,1) circle (0.5)
(3,1)--(3,2)--(2,2)--(3,1)  (2,0)rectangle (2.5,.5) (2,1) circle (2)
;


But returns "symmetric difference"

\fill[blue,even odd rule] (0,1) circle (0.5)   (2,1) circle (2)  ;

filling "uncommon" points.


However if I want only large disc without points of the small one I try

\clip (2,1) circle (2)  ;
\filldraw[ even odd rule] (0,1) circle (0.5)   (2,1) circle (2)  ;

which is "almost" perfect but returns a "ghost" line.

Funny, but making ***larger*** domain to clip solves the problem.


\clip (2.1,1) circle (2)  ;
\filldraw[ even odd rule] (0,1) circle (0.5)   (2,1) circle (2)  ;

Does it mean that even-odd rule affects even clip before?


Victor

-- 
========================
Victor Ivrii, Professor, Department of Mathematics, University of Toronto
http://www.math.toronto.edu/ivrii