Thread: TikZ polynomials bug

hi!

i've found bug in ubuntu's tikz distribution. quadratic polynomials not plotted correctly.
code:

code:

\documentclass[10pt]{article}  \usepackage{pgf,tikz}  \usetikzlibrary{arrows}  \pagestyle{empty}  \begin{document}  \definecolor{uququq}{rgb}{0.25,0.25,0.25}  \definecolor{wwwwww}{rgb}{0.4,0.4,0.4}  \begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]  \draw[->,color=black] (-2.5,0) -- (4.23,0);  \foreach \x in {-2,-1,1,2,3,4}  \draw[shift={(\x,0)},color=black] (0pt,2pt) -- (0pt,-2pt) node[below] {\footnotesize $\x$};  \draw[->,color=black] (0,-2.1) -- (0,3.92);  \foreach \y in {-2,-1,1,2,3}  \draw[shift={(0,\y)},color=black] (2pt,0pt) -- (-2pt,0pt) node[left] {\footnotesize $\y$};  \draw[color=black] (0pt,-10pt) node[right] {\footnotesize $0$};  \clip(-2.5,-2.1) rectangle (4.23,3.92);  \draw(-2.31,-1.11) -- (-1.12,-1.11);  \draw(-2.33,-0.7) -- (-1.14,-0.7);  \draw [domain=-2.5:4.23] plot(\x,{(--1-0*\x)/1});  \draw [samples=50,rotate around={0:(1,1)},xshift=1cm,yshift=1cm,line width=1.6pt] plot (\x,\x^2/2/0.5);  \draw [samples=50,rotate around={-180:(1,1)},xshift=1cm,yshift=1cm,color=wwwwww] plot (\x,\x^2/2/0.5);  \draw [dash pattern=on 3pt off 3pt] (1,-2.1) -- (1,3.92);  \begin{scriptsize}  \fill [color=black] (-1.6,-1.11) circle (1.5pt);  \draw[color=black] (-1.52,-0.89) node {$b = 1$};  \fill [color=black] (-1.62,-0.7) circle (1.5pt);  \draw[color=black] (-1.55,-0.49) node {$a = 1$};  \draw[color=black] (-1.39,1.15) node {$y_m$};  \draw[color=black] (-0.37,2.69) node {$y_1$};  \draw[color=wwwwww] (-0.35,-0.56) node {$y_2$};  \fill [color=uququq] (2,0) circle (1.5pt);  \draw[color=uququq] (2.4,0.15) node {$b = (2, 0)$};  \fill [color=uququq] (0,0) circle (1.5pt);  \draw[color=uququq] (0.4,0.15) node {$a = (0, 0)$};  \fill [color=uququq] (1,1) circle (1.5pt);  \draw[color=uququq] (1.6,1.15) node {$vertex = (1, 1)$};  \end{scriptsize}  \end{tikzpicture}  \end{document}

how plotted:
http://i.imgur.com/7htik.png

how should plotted:
http://i.imgur.com/3bkib.png

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