[Therion] New symbols

[Andrew Atkinson]

I have already done a hand rail in plan, due to being involved in 
surveying a show cave, been meaning to put it on the kiwi for a while 
now. This is one of my first attempts at symbol definition, (cannot 
remember what I adapted it from), probably very poor, but in case it can 
help.

Steps would be wonderful, I have spent far too long trying to use a 
border to draw steps.

The other one that vaguely crossed my mind was a point symbol for light, 
but I put it to the back of the list after very little time

thanks

Andrew

def l_u_rail (expr P) =
   T:=identity;
   cas := 0;
   dlzka := arclength P;
   mojkrok:=adjust_step(dlzka, 0.8u);
   pickup PenC;
   forever:
     t0 := arctime (cas) of P;
     t1 := arctime (cas + mojkrok*2/5) of P;
     t  := arctime (cas + mojkrok/2) of P;
     t4 := arctime (cas + mojkrok*3/5) of P;
     t5 := arctime (cas + mojkrok) of P;
     thdraw (subpath (t0,t1) of P);
     thdraw (subpath (t4,t5) of P);
     drawdot
        (point t of P);
     #mark_ (P,t,0.02u);
     #mark_ (P,t,-0.02u);
      #f := (P,t,0.2u);
      #draw f;
     cas := cas + mojkrok;
     exitif cas > dlzka - (2*mojkrok/3); % for rounding errors
   endfor;
enddef;


initsymbol("l_u_rail")
#text en line u:rail "Railing"

On 11/11/11 19:48, Stacho Mudrak wrote:
> Hello everybody,
>
> after drawing a complex map of one show cave, I would like to add new
> standard symbols to therion. These should include:
>
> line edge - should be used to draw other then rock edges, e.g. wall
> structures in elevation. There is already rock-border -- rock-edge pair,
> there is general border symbol but no general edge symbol.
>
> line rope - already discussed here, just line point option anchor on|off
> should work also
>
> line handrail - this symbol already exists in some cave symbol sets. A line
> with dots in plan, in elevation some standard 1m tall handrail would be
> drawn.
>
> point handrail - used to draw handrail in cross-sections
>
> line steps - should be used in both, plan / elevation projections. In plan,
> this line would surround steps area and steps would be drawn parallel to
> the first line segment. In elevation, 20cm steps would be drawn.
>
> line path - used to draw concrete or other path in caves, where it was
> built. If it will be closed curve, it will be filled with "area path". See
> below.
>
> area path - fill for path areas. It would be automatically applied for
> closed line steps/path in plan projection.
>
> Also should be added:
> line rope-ladder
> line fixed-ladder
> line via-ferrata
> point via-ferrata
>
> Do these symbols make sense? Any comments? Any other symbols, that should
> exist in the standard therion library?
>
> Thanks a lot for the feedback, S.
>
>
>
>
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