Hi Elke,
you should probably post this request on the PGF mailing list.
Kind regards
Christian
Am 24.06.2013 19:41, schrieb Elke Faßhauer:
> Dear all,
>
> I am struggeling to place an object (a red circle) using polar
> coordinates with respect to a chosen center called ground.
>
> Any ideas?
>
> Here is the snipped:
>
> \documentclass[]{beamer}
> \usepackage[T1]{fontenc}
> \usepackage[english,german]{babel}
> \usepackage{xcolor}
> \usepackage{graphicx}
>
> \usepackage{tikz,pgfplots}
> \usetikzlibrary{positioning,fadings,patterns}
>
> \usepackage{tikz,pgfplots}
> \usetikzlibrary{positioning,fadings,patterns}
>
> \tikzfading[name=fade inside,
> inner color=transparent!80,
> outer color=transparent!30]
>
>
> \begin{document}
> \begin{tikzpicture}[scale=0.5]
> \draw [help lines] (0,0) grid (23,5);
> \coordinate(ground) at (2,2) {};
> \draw [very thick] (ground) circle (1.2);
> \shade [ball color=white,path fading=fade inside] (ground)
> circle (1.5);
> \coordinate (ov1) at (0:1.5) {};
> \shade [ball color=red] (ov1) circle (0.2);
> \end{tikzpicture}
> \end{document}
>
> I have tried to place several +s in front of the polar coordinates, but
> this does not show any effect.
>
> Thank you in advance.
>
> Elke
>
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