[Therion] Using metapost code examples

[Stefan Oswald]

Hi, 

The size is controlled by the factor before the u. (symbolsize:=1.0u; %Factor*u; Factor=size of the blocks change 1.0 as you want) 
>Does this apply to each instance of a block or is it a  
>global definition.
This overrules the point_block sizes in the whole plan compiled. 
Size canging/definition of a single block is, as far as i know, not possible and not projected?

The problem was (with other symbols it is still the case, a solution could be, for example an layout command for small symbols) that with small caves in small scales the normative symbol size is too large, so it might happen that you only see a small part of the symbol in a narrow passage on small scale. 
You can handle this problem with block_points and block_area in UIS as in described in wiki by changing the factor before the "u". 

Glück Tief, Stefan

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> Datum: Tue, 30 Dec 2008 12:00:01 +0100
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> An: therion at speleo.sk
> Betreff: Therion Digest, Vol 37, Issue 14

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>    1. Using metapost code examples (Dave Clucas)
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> Message: 1
> Date: Tue, 30 Dec 2008 19:00:56 +0800
> From: Dave Clucas <dave at daveclucas.com>
> Subject: [Therion] Using metapost code examples
> To: therion at speleo.sk
> Message-ID: <2CDC217E-E91E-4780-A35C-F6B719CC9D32 at daveclucas.com>
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> Looking at the metapost examples in the Wiki it appears that a block  
> symbol can be defined or redefined which allows the size of the block  
> to be changed. Does this apply to each instance of a block or is it a  
> global definition. How do you specify the size of the block when you  
> place it in the drawing?
> 
>    code metapost
>     def p_blocks_UIS (expr pos,theta,sc,al)=
>      symbolsize:=1.0u; %Factor*u; Factor=size of the blocks
>      U:=(.5u,.5u);
>      T:=identity aligned al rotated theta scaled sc shifted pos;
>      pickup PenC;
>      thdraw (.0symbolsize,.0symbolsize)--(1.0symbolsize,-. 
> 5symbolsize)--(0.0symbolsize,-1.5symbolsize)-- 
> (-1.0symbolsize,-1.0symbolsize)--cycle;
>      thdraw (.5symbolsize,-.25symbolsize)--(1.0symbolsize,. 
> 5symbolsize)--(0.0symbolsize,1.5symbolsize)--(-0.5symbolsize,. 
> 5symbolsize);
>      thdraw (.0symbolsize,.0symbolsize)--(.0symbolsize,.5symbolsize)-- 
> (-1.5symbolsize,.5symbolsize)--(-1.5symbolsize,-0.5symbolsize)-- 
> (-0.5symbolsize,-0.5symbolsize);
>     enddef;
>    endcode
> 
> 
> 
> Dave Clucas
> email:dave at daveclucas.com
> Website: http://daveclucas.com
>                   http://mycaves.org
> Skype: daveclucas
> 
> 
> 
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