[Therion] Rope and anchors symbols

Fri Feb 2 20:36:53 CET 2018

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-------- Původní zpráva --------Od: Evaristo Quiroga via Therion <therion at speleo.sk> Datum: 02.02.18  17:32  (GMT+01:00) Komu: Владимир Георгиев via Therion <therion at speleo.sk> Cc: Evaristo Quiroga <eqr at ecgracia.com> Předmět: Re: [Therion] Rope and anchors symbols 

    Hi Vladimir,

      Finally  I have choose the easy way (see the attached figure).
      Yours comments and other forum members convinced me. And it's more
      easy  also to coordinate with new Topodroid symbols. 

      Now I have two new user anchor symbols: u:anchor_artificial and
      u:anchor_natural which I combine with rope section with or without
      rebelays and anchors. 

      I put the mpost code if others users want use it. 

      I have choose a brown colour to rigging (rope and anchors). As you can not
          choose the color of the user symbols, with "symbol-colour",  I
          had to define it in the mpost.

      Thanks,

      Evaristo. 

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

      def p_u_anchor_artificial(expr pos,theta,sc,al) =

        T:=identity shifted pos;

        thdraw origin withpen pencircle scaled 0.25u withcolor
        (0.58, 0.44, 0.25);

      enddef;

       initsymbol ("p_u_anchor_artificial");

      def p_u_anchor_natural(expr pos,theta,sc,al) =

          U:=(.2u,.2u);

          T:=identity aligned al rotated theta scaled sc shifted
        pos;

          thfill (-.2u,-.2u)--(0,.2u)--(.2u,-.2u)--cycle
        withcolor (0.58, 0.44, 0.25); 

      enddef;

       initsymbol ("p_u_anchor_natural");

        symbol-colour line rope [58 44 25]

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

      El 02/02/2018 a las 16:54, Владимир Георгиев via Therion escribió:

        Hi Evaristo

        Indeed the
          line rope needs some additions in an elegant way :).
          Occasionally I have also wanted to make a Y-anchor without the
          dot in the middle. But I hadn't had the time to add this
          feature. It can be done by adding extra line point options.
          Similar to "adjust horizontal", "l-size", etc for "line:wall".

        This will
          require modifications to both the Metapost code to draw the
          symbol, and to the therion c++ code that parses the options.

        It would be
          possible to draw different types of anchors depending on the
          line point option, but I am not sure if it will be easy to
          reflect the used anchors in the legend.

        Actually it
          would be best if there are both ways of setting an anchor:
          with a line point option, or with a separate point "anchor"
          with different options. The "anchor" point already exists, but
          is only one type.

        When I draw a
          rope I always use it with "rebelays off" now and draw the
          rebelays with a Bezier line. This allows me better control,
          because the automatic rebelay curves don't always fit well in
          the pit shape.

        Evaristo, if
          you want to work on the code, I can try to help. The above are
          all nice ideas, like many others, but I personally don't have
          the time to experiment with implementing them.

        Vladimir

        On Thu, Feb 1, 2018 at 1:57 PM,
          Evaristo Quiroga via Therion <therion at speleo.sk>
          wrote:

              Hi,
              I greatly appreciate the improvement made by Vladimir
                at the rope line symbol.
              https://www.mail-archive.com/therion@speleo.sk/msg05992.html
              With this symbol you can control if the rope section
                has anchors and rebelays, as line options. This options
                are global to the line:  have or not rebelays or
                anchors. 

              Now a I need to go more ahead, I want control the
                anchor type (natural: tree, block, etc or artificial:
                spit, multimonti, parabolt, etc) in every point and the
                rebelay in previous section. I want a round
                    point for artificial anchor (like the Vladimir
                    symbol) and a triangle point for natural anchor.

              When we rig with Y knots and deviators you need to
                control the line section without rebelays and anchors, so
                    that the rope is straight and the knots do not
                    appear as anchors. (see attached figure). 

              Now
                    I have to way to implement this in Therion: the easy
                    and the elegant.
              Easy.
                    Create two new point symbols for natural and
                    artificial anchors. And use the rope line symbol
                    with rebelay and anchor OFF in the rope section with
                    Y and deviators, and  ON in the other sections. 

              Elegant.
                    Create a new rope line symbol, where I can control
                    in every point the anchor type (Natural, Artificial
                    or None, for knot) and the rebelay rope effect in
                    the previous rope section. I think we can do this by
                    defining options to the line point. I know other
                    have implemented similar option, like "adjust
                    horizontal". To do this a need code examples with
                    similar option implementation to inspire me. 

              Thanks,
              Evaristo.

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