I'm afraid that's what I thought. We have the situation here in Mulu where the main passages are 50m wide with house sized boulders with side passages a mere 5m wide and small car size boulders so ideally we need a mixture of block sizes to play with. And of course chambers the size of football fields.

On 31 Dec 2008, at 19:00, therion-request@speleo.sk wrote:

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Today's Topics:

  1. Re: Using metapost code examples (Stefan Oswald)
  2. Re: Using metapost code examples (Martin Budaj)
  3. Re: Using metapost code examples (Wookey)


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Message: 1
Date: Tue, 30 Dec 2008 13:01:17 +0100
From: "Stefan Oswald" <stefan_oswald@gmx.at>
Subject: Re: [Therion] Using metapost code examples
To: therion@speleo.sk
Message-ID: <20081230120117.233970@gmx.net>
Content-Type: text/plain; charset="iso-8859-1"

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".

Gl?ck Tief, Stefan

-------- Original-Nachricht --------
Datum: Tue, 30 Dec 2008 12:00:01 +0100
Von: therion-request@speleo.sk
An: therion@speleo.sk
Betreff: Therion Digest, Vol 37, Issue 14

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Today's Topics:

  1. Using metapost code examples (Dave Clucas)


----------------------------------------------------------------------

Message: 1
Date: Tue, 30 Dec 2008 19:00:56 +0800
From: Dave Clucas <dave@daveclucas.com>
Subject: [Therion] Using metapost code examples
To: therion@speleo.sk
Message-ID: <2CDC217E-E91E-4780-A35C-F6B719CC9D32@daveclucas.com>
Content-Type: text/plain; charset="us-ascii"; Format="flowed";
DelSp="yes"

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@daveclucas.com
Website: http://daveclucas.com
                 http://mycaves.org
Skype: daveclucas




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------------------------------

Message: 2
Date: Tue, 30 Dec 2008 13:19:32 +0100
From: "Martin Budaj" <m.budaj@gmail.com>
Subject: Re: [Therion] Using metapost code examples
To: "List for Therion users" <therion@speleo.sk>
Message-ID:
<f64c1c4a0812300419x6a3e3d7ek1c2e3411c44a37d9@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

Size canging/definition of a single block is, as far as i know, not possible and not projected?

You can do it simply by using -scale xl option (or -scale s etc.) for
(almost) any point symbol.

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.

Try playing with base-scale layout option. It should address exactly this issue.

martin


------------------------------

Message: 3
Date: Tue, 30 Dec 2008 22:57:46 +0000
From: Wookey <wookey@wookware.org>
Subject: Re: [Therion] Using metapost code examples
To: therion@speleo.sk
Message-ID: <20081230225746.GO8858@knossos.aleph1.co.uk>
Content-Type: text/plain; charset=us-ascii

On 2008-12-30 13:19 +0100, Martin Budaj wrote:
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.

Try playing with base-scale layout option. It should address exactly this issue.

Ah yes. I had this problem Dave. The Therion defaults are/were for
relatively small caves at 1:200 so our huge ones at 1:3000 need some
-base-scale and -scale options to be right.

I'll get you my files so you can see the numbers I used.

Wookey
--
Principal hats:  Balloonz - Toby Churchill - Aleph One - Debian
http://wookware.org/


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Dave Clucas
Website: http://daveclucas.com
                 http://mycaves.org
Skype: daveclucas