3D with tikz

[Alain Matthes]

hi,

I make this try with an example of the cocumentation

\documentclass{minimal}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture} [scale=4]
\pgfsetfillcolor{lightgray}
\foreach \latitude in {-90,-75,...,30}
{
\foreach \longitude in {0,20,...,360}
{
\pgfpathmoveto{\pgfpointspherical{\longitude}{\latitude}{1}}
\pgfpathlineto{\pgfpointspherical{\longitude+20}{\latitude}{1}}
\pgfpathlineto{\pgfpointspherical{\longitude+20}{\latitude+15}{1}}
\pgfpathlineto{\pgfpointspherical{\longitude}{\latitude+15}{1}}
\pgfpathclose
}
\pgfusepath{fill,stroke}
}
\end{tikzpicture}
\end{document}

With tikz, I try

\documentclass{minimal}
\usepackage{tikz}

\begin{document}

\makeatletter
\define@key{sphericalkeys}{longitude}{\def\mylongitude{#1}}
\define@key{sphericalkeys}{latitude}{\def\mylatitude{#1}}
\define@key{sphericalkeys}{radius}{\def\myradius{#1}}

\tikzdeclarecoordinatesystem{spherical}%
{%
\setkeys{sphericalkeys}{#1}%
\pgfpointspherical{\mylongitude}{\mylatitude}{\myradius}
}
\begin{tikzpicture}[scale=4]

\foreach \numla in{-90,-75,...,90}
{\foreach \numlo in {0,10,...,360}
\path[draw,fill=gray!50,opacity=1]%
(spherical cs:longitude=\numlo,latitude=\numla,radius=1) to
(spherical cs:longitude=\numlo+10,latitude=\numla,radius=1) to
(spherical cs:longitude=\numlo+10,latitude=\numla+15,radius=1) to
(spherical cs:longitude=\numlo,latitude=\numla+15,radius=1);}
\end{tikzpicture}

\end{document}

But the library 3D in pgf 2.00 gives

% New coordinate systems:

\tikzdeclarecoordinatesystem{xyz spherical}
{%
\pgfset{/tikz/cs/.cd,angle=0,radius=0,latitude=0,longitude=0,#1}%
\pgfpointspherical{\tikz@cs@angle}{\tikz@cs@latitude}{\tikz@cs@radius}%
}
\pgfset{/tikz/cs/longitude/.store in=\tikz@cs@angle}
\pgfset{/tikz/cs/latitude/.store in=\tikz@cs@latitude}

But I have a problem with the next code

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{calc,3d}
\begin{document}

\begin{tikzpicture}[scale=2]

\foreach \numla in{-90,-75,...,90}
{\foreach \numlo in {0,10,...,360}
\path[draw,fill=gray!50,opacity=1]%
(xyz spherical cs:longitude=\numlo,latitude=\numla,radius=1) to
(xyz spherical cs:longitude=\numlo+10,latitude=\numla,radius=1) to
(xyz spherical cs:longitude=\numlo+10,latitude=\numla+15,radius=1) to
(xyz spherical cs:longitude=\numlo,latitude=\numla+15,radius=1);}
\end{tikzpicture}
\end{document}

Error : macro undefined
why ???

Thanks

best Regards

Alain Matthes

[Daniel Winkelmann]

Alain Matthes wrote:
>
>
> Error : macro undefined
> why ???
>

The line

\pgfset{/tikz/cs/radius/.store in=\tikz@cs@radius}

seems to be missing in the 3D library

I added it to your document

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{calc,3d}

\makeatletter
\pgfset{/tikz/cs/radius/.store in=\tikz@cs@radius}
\makeatother

\begin{document}
\begin{tikzpicture}[scale=2]
\foreach \numla in{-90,-75,...,90}
{\foreach \numlo in {0,10,...,360}
\path[draw,fill=gray!50,opacity=1]%
(xyz spherical cs:longitude=\numlo,latitude=\numla,radius=1) to
(xyz spherical cs:longitude=\numlo+10,latitude=\numla,radius=1) to
(xyz spherical cs:longitude=\numlo+10,latitude=\numla+15,radius=1) to
(xyz spherical cs:longitude=\numlo,latitude=\numla+15,radius=1);}
\end{tikzpicture}
\end{document}

it worked

Daniel

[Alain Matthes]

On 2009-07-31 18:58:35 +0200, "Daniel Winkelmann" <winke...@arcor.de> said:

> Alain Matthes wrote:
>>
>>
>> Error : macro undefined
>> why ???
>>
>
> The line
>
> \pgfset{/tikz/cs/radius/.store in=\tikz@cs@radius}
>
> seems to be missing in the 3D library
>
> I added it to your document

Thanks !

Best Regards

Alain Matthes