Preview too wide

Dear Friends,

Below is the code for a figure I am producing. My problem is that it  
is not cropped enough horizontally. Is there a remedy? (It would help  
me if you could cc my email when replying to the list.)

Thanks,
MK

%! program = pdflatexmk

\documentclass[]{article}
\usepackage{tikz,pgfbaseimage}
\usepackage{amssymb,amsmath,pifont,latexsym,lmodern}
\usetikzlibrary{shapes,arrows,calc}
\usepgfmodule{matrix}
\usepackage{xspace}
\newcommand{\aV} {$\boldsymbol{a}$\xspace} %
\newcommand{\bV} {$\boldsymbol{b}$\xspace} %
\newcommand{\cV} {$\boldsymbol{c}$\xspace} %
\newcommand{\dV} {$\boldsymbol{d}$\xspace} %
\newcommand{\aD} {$| \boldsymbol{a}|$\xspace} %
\newcommand{\bD} {$| \boldsymbol{b}|$\xspace} %
\newcommand{\cD} {$| \boldsymbol{c}|$\xspace} %
\newcommand{\dD} {$| \boldsymbol{d}|$\xspace} %
\newcommand{\vD} {$| \boldsymbol{v}|$\xspace} %
\usepackage[active,tightpage,pdftex]{preview}

\PreviewEnvironment{tikzpicture}
\begin{document}
\begin{preview}
\begin{center}
{\sf
\begin{tikzpicture}[scale = 1]
        \filldraw[fill=red!50!white,draw=black]
                (0,0) -- (20mm,0mm) arc (0:360:20mm) -- (0,0);
        \filldraw[fill=green!50!white,draw=black]
                (0,0) -- (20mm,0mm) arc (0:321: 20mm) -- (0,0);
        \filldraw[fill=blue!50!white,draw=black]
                (0,0) -- (20mm,0mm) arc (0:253: 20mm) -- (0,0);
        \filldraw[fill=yellow!50!white,draw=black]
                (0,0) -- (20mm,0mm) arc (0:151: 20mm) -- (0,0);
        \draw (22mm,-5mm)
                node[fill=red!20!white]{${\scriptstyle p(d) = 0.11}$} -- (22mm,25mm)
                node[fill=red!20!white]{${\scriptstyle k\,\varphi(d) = 38}$} --  
(22mm,35mm)
                node[fill=red!20!white]{\scriptsize \dD};
        \draw (0mm,10mm)
                node[fill=yellow!20!white]{${\scriptstyle p(a) = 0.42}$} -- (0mm,25mm)
                node[fill= yellow!20!white]{${\scriptstyle k\,\varphi(a) = 150}$}
                node[left=7mm]
                        {\textsf{
                                $\genfrac{}{}{0pt}{}
                                {\text{orientation-tuned}}
                                {\text{interpolators}}\Rightarrow$
                        }} -- (0mm,35mm)
                node[fill= yellow!20!white]{\scriptsize \aD}
                node[left=7mm]
                        {\textsf{
                                $\genfrac{}{}{0pt}{}
                                {\text{orientation-tuned}}
                                {\text{interpolators}}\Rightarrow$
                        }};
        \draw (-12mm,-3mm)
                node[fill=blue!20!white]{${\scriptstyle p(b) = 0.28}$}
                        -- (-12mm,-25mm)
                node[fill= blue!20!white]{${\scriptstyle k\,\varphi(b) = 99}$}
                        -- (-12mm,-35mm)
                node[fill= blue!20!white]{\scriptsize \bD};
        \draw (5mm,-12mm)
                node[fill=green!20!white]{${\scriptstyle p(c) = 0.19}$} -- (5mm,-25mm)
                node[fill= green!20!white]{${\scriptstyle k\,\varphi(c) = 68}$}
                node[right=7mm]
                        {\textsf{
                                $\Leftarrow \genfrac{}{}{0pt}{}
                                {\text{orientation-tuned}}
                                {\text{interpolators}}$
                        }} -- (5mm,-35mm)
                node[fill= green!20!white]{\scriptsize \cD}
                node[right=7mm]
                        {\textsf{
                                $\Leftarrow \genfrac{}{}{0pt}{}
                                {\text{orientation-tuned}}
                                {\text{interpolators}}$
                        }};
\end{tikzpicture}
}
\end{center}
\end{preview}

\end{document}



_____________________________
Professor Michael Kubovy
University of Virginia
Department of Psychology
USPS:     P.O.Box 400400    Charlottesville, VA 22904-4400
Parcels:    Room 102        Gilmer Hall
       McCormick Road    Charlottesville, VA 22903
Office:    B011    +1-434-982-4729
Lab:        B019    +1-434-982-4751
Fax:        +1-434-982-4766
WWW:    http://www.people.virginia.edu/~mk9y/



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