Created attachment 278439 [details]
What evince shows

When drawing a picture of a circle filled with striped pattern using tikz the pattern is printed also outside of the circle boundary in the pdf file.

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STEPS TO REPRODUCE THE PROBLEM:
1) save this code:
[LaTeX code]
\documentclass[a4paper]{article}
\usepackage{tikz}
\usetikzlibrary{patterns}
\begin{document}
\begin{figure}[tbp]
    \centering
    \begin{tikzpicture}
        \draw [pattern = north west lines] (0, 0) circle [radius=2];
    \end{tikzpicture}
\end{figure}
\end{document}
[/LaTeX code]

2) compile using pdflatex. On my machine, I have version 3.1415926:
$ pdflatex --version
     pdfTeX 3.1415926-1.40.10-2.2 (TeX Live 2009/Debian)
     kpathsea version 5.0.0
     Compiled with libpng 1.2.46; using libpng 1.2.46
     Compiled with zlib 1.2.3.4; using zlib 1.2.3.4
     Compiled with poppler version 0.18.2

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ACTUAL RESULT:
The actual result is shown in the attachment. 

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EXPECTED RESULT:
The filling lines should not exceed the circle boundary