Possible Duplicate:
TikZ borders showing through when they shouldn’t (overlapping circles)
I have a strange problem with using tikz-qtree where the thickness of the lines are a bit odd. When I say odd I mean that when you zoom in it looks fine, and when you zoom out some of the lines appear thicker. I think its due to lines overlapping. Do you have any ideas?
Here's an example that shows the behaviour I'm talking about:
\documentclass{report}
\usepackage{tikz}
\usepackage{tikz-qtree}
\begin{document}
\begin{figure}[H]
\centering
\begin {tikzpicture}[sibling distance=20pt]
\tikzset{edge from parent/.style=
{draw,
edge from parent path={(\tikzparentnode.south)
-- +(0,-8pt)
-| (\tikzchildnode)}}}
\Tree [.{\bf Sibiu} [.{Oradea (380)} ] [.{Arad (366)} ] [.{Rimnicu V. (192) } ] [.{\bf Fagaras (176)} {Bucharest (0)} ] ]
%\Tree [.A [.B D E ] [.C F G ] ]
\end {tikzpicture}
\caption{Evaluating the adjacent nodes to Fagaras in a greedy search.}
\label {fig:GreedySecond}
\end{figure}
\end{document}
Compile it to a pdf and try zooming in and out (look towards the center), it's subtle but noticeable enough that I don't want it in my thesis. I'm pretty sure it happens when I run Evince on Linux and when I run Foxit on Windows. If nobody can tell what I mean I'll post some screenshots but I'm sure some people here are as pedantic as I am about presentation.
