[Therion] Symbol for fixed ladder

[Benedikt Hallinger]

Thank you anyone,
i wanted the ladder symbol different in three ways:
1. the sides at the top and bottom of the ladder should extend the last rung 
a little. With steps it looks not lie a ladder really.
2. the width is too much for my taste and the relation to the height of the 
rung-spacing.
3. I dont want to care about additional parameters, i just want to draw a 
line:fixed-ladder and be fine with it. This way i may exchange the symbol 
with other variants if neccessary without having to deal with representation 
in my th2-file.

Lets see what rowena has.
An idea striking me suddenly as i write this, is to dig into the meander 
symbol as this is somewhat similar.


Am 2017-01-25 10:00, schrieb Bruce Mutton via Therion:
> This post from January 2014 explains the rectangle with number of steps 
> specified.
> https://www.mail-archive.com/therion@speleo.sk/msg04814.html
>
> Bruce
>
> -----Original Message-----
> From: Therion [mailto:therion-bounces at speleo.sk] On Behalf Of Martin Sluka 
> via Therion
> Sent: Wednesday, 25 January 2017 7:45 PM
> To: List for Therion users <therion at speleo.sk>
> Cc: Martin Sluka <martinsluka at mac.com>
> Subject: Re: [Therion] Symbol for fixed ladder
>
> Isn't there one on wiki? The principle was to draw rectangle and to add 
> the parameter as number of steps.
>
> Odesláno z iPhonu
>
> 24. 1. 2017 v 23:51, Benedikt Hallinger via Therion <therion at speleo.sk>:
>
>> Hello,
>> i get gray hair with metapost while i want to make a line symbol for 
>> ladders, so i can nicely draw them in my maps as the cave have alot of 
>> them.
>>
>> The basic idea i had was, t define a symbol of one "rung" segment
>> (rung and a little of either sides, like the letter "H") as a symbol 
>> picture. Then i wanted to apply this image seamlessly over the length of 
>> the given path (straight lines) What i have for now is the following, 
>> however it does not show at all (still shows a red line with symbol set AUT 
>> in effect), so i have no clue how to even debug this.
>>
>> I tried to start with the example from thbook salted a little with peeks 
>> to the internal metapost codes.
>>
>> Can someone assist please?
>>
>> Thank you very much!
>>
>>
>> # Symbol for fixed ladder
>>    def l_fixedladder_SKBB (expr P) =
>>      T:=identity;
>>      cas := 0;
>>      dlzka := arclength P;
>>      mojkrok:=adjust_step(dlzka, 1.0u);
>>
>>      pickup PenC;
>>      sideL := (-.20u,0)--(-.20u,0.20u);
>>      sideR := (.20u,0)--(.20u,0.20u);
>>      rung  := (-.20u,0.10u)--(.20u,0.10u);
>>
>>      picture symbol,test_symbol;
>>      symbol:= image (
>>                 thdraw sideL;
>>                 thdraw sideR;
>>                 thdraw rung;
>>                 );
>>
>>      forever:
>>            t := arctime cas of P;
>>            thdraw symbol shifted (point t of P) withcolor black;
>>            cas := cas + mojkrok;
>>            exitif cas > dlzka + (mojkrok / 3); % for rounding errors
>>      endfor;
>>
>>    enddef;
>>
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