Re: TikZ for geometric drawings?

I know it is not TikZ, but haven´t you tried Mathspic?
http://www.ctan.org/tex-archive/graphics/mathspic/dos/mpicm21.pdf (old
manual, see page 14, 25)

Downloads: http://dante.ctan.org/indexes/graphics/mathspic/

I used the DOS version, I assume the Perl version works better. I think it
should solve some of your problems... like perpendiculars, middle point,
etc..

Mitoo

Alain Matthes-2 wrote:
> 
> 
> Le 11 févr. 07 à 22:13, rouben.rostamian <at> comcast.net a écrit :
> 
>> Daniel Flipo <daniel.flipo <at> univ-lille1.fr> wrote:
>>
>>> I am starting to learn TikZ and I wonder whether I could use TikZ for
>>> geometric constructions like, say, the "nine points circle" of a
>>> triangle (EPS appended: mp-exemple.1).
>>
>> I too wish that TikZ had greater capability for doing
>> standard geometric constructions. As far as I can tell,
>> basic functionality, such as querying the coordinates
>> of an intersection is not available (yet). In November I
>> wrote to this mailing list asking: "Given points P and Q,
>> is there a way to draw a circle centered at P that goes
>> through Q?" There were no responses so I assume that it
>> is not possible either.
>>
> 
> yes it's possible : you can see an example page 17
> of my doc (in french :( )but i'm workin on this doc now and it's not  
> finished
> 
> http://altermundus.fr/SandBox/TKZdoc-fct-main.pdf
> 
> Perhaps the code below can help you
> 
> \newcommand*{\extractvect}[2]{%  \vx et \vy
> \pgfextractx{\pgf <at> x}{\pgfpointanchor{#1}{center}}
> \pgf <at> xa=\pgf <at> x%
> \pgfextracty{\pgf <at> y}{\pgfpointanchor{#1}{center}}
> \pgf <at> ya=\pgf <at> y%
> \pgfextractx{\pgf <at> x}{\pgfpointanchor{#2}{center}}
> \pgfextracty{\pgf <at> y}{\pgfpointanchor{#2}{center}}
> \advance\pgf <at> x by-\pgf <at> xa\relax%
> \advance\pgf <at> y by-\pgf <at> ya\relax%
> \global\expandafter\edef\csname tkz <at> vx\endcsname{\the\pgf <at> x}%
> \global\expandafter\edef\csname tkz <at> vy\endcsname{\the\pgf <at> y}
> }
> 
> \newdimen\@tmplen
> % longueur entre deux noeuds
> \newcommand*{\dist}[2]{
> \extractvect{#1}{#2}
> \@tmplen=\tkz <at> vx
> \edef\@vx{\strip <at> pt\@tmplen}%
> \FPmul\@vxc{\@vx}{\@vx}
> \@tmplen=\tkz <at> vy
> \edef\@vy{\strip <at> pt\@tmplen}%
> \FPmul\@vyc{\@vy}{\@vy}
> \FPadd{\@sdc}{\@vxc}{\@vyc}
> \FProot{\@sdc}{\@sdc}{2}
> \global\let\@sdc\@sdc
> }
> 
> 
> \define <at> cmdkey[TKZ]{tkzcc}{pos}{}
> \define <at> cmdkey[TKZ]{tkzcc}{color}{}
> \define <at> cmdkey[TKZ]{tkzcc}{size}{}
> \define <at> cmdkey[TKZ]{tkzcc}{style}{}
> \presetkeys[TKZ]{tkzcc}{color = black,%
>                           size  = 0.8 pt,%
>                           pos   = above}{}
> 
> \newcommand*{\tkzcc}[1][]{\tkz <at> cc[#1]}%
> \def\tkz <at> cc[#1](#2,#3){%
> \dist{#2}{#3}
> \draw[] (#2) circle (\@sdc pt);}
> 
> 
> \tkzcc(A,B)
> 
> Alain Matthes
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