[Therion] Rope and anchors symbols

[Evaristo Quiroga]

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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