Posted by sand1024 on Feb 07, 2025; 11:15am
URL: https://forum.librecad.org/Command-line-file-tp5726287p5726400.html

well, I suppose this might be an overkill to do a real recording (like for macros).

Actually, as far as I understand, the major usage scenario for command files is an attempt to use a "semi-parametric" approach. I.e. - command script is modified by the user either directly or with help of variables to achieve something new that is similar yet a bit different.

If my assumption there is correct, I suppose much simpler approach may be reasonable.

Instead of recording various input, it's possible just iterate over all entities within drawing (or probably just iterate over selected entities) and generate a script with commands  that should be played for creation of such entities.

As far as I understand, there will be just one command per entity withing the script.  

Such approach will eliminate all intermediate editing and will let the user to use existing drawing as a "template" for creation of changed modifications.  

For sure, there will be some limitations in such script.  

For example -  I'm not sure how to script hatch or specify active layer or attributes of entity. Or to execute some command that resquires pre-selection of entities (like trim or bevel etc.)

Despite limitations, I suppose in general such approach should be useful.  

The only thing which is not clear for me so far, is whether it is possible to enrich such generated script by some parameterization.

Actually, most of parametrization there will be related to the way how coordinates are generated.

As far as I can see, in order to simplify further parametrization, it's possible to generate coordinates as:

1) absolute ones;
2) relative to fixed relative zero point
3) relative to previous point (simulate how relative point is moved by the draw action of the entity)
4) use variables for coordinates that are included into the script more than once.
5) rely on polar coordinates where possible (and length value of the polar may be just a variable)

The overall implementation of such approach seems to be more than straightforward, the only thing to think about is parametrization thing i've mentioned.