Calc on Dimension Label

Greetings from the Pantanal, Brazil,

We need different scales in the same drawing. To avoid paper space and more dimension styles, the calc function on Dimension Label would be interesting. In the same object with a diameter of 30.00 that was enlarged 2x, in the property on the dimension, I could have written <>*0.5 in label, or an equivalent expression, for a dimension of 60.00 to become 30.00. Could this be possible?

Currently, it's not possible.

We may consider adding a feature here, for example dimension by a function,to support nonlinear measurement.

Another feature, we want is views, to properly address the current issue.

Measurement by a function would be easier to support, but probably not within dxf specifications.

Arthur Emmanuel wrote

Greetings from the Pantanal, Brazil,

We need different scales in the same drawing. To avoid paper space and more dimension styles, the calc function on Dimension Label would be interesting. In the same object with a diameter of 30.00 that was enlarged 2x, in the property on the dimension, I could have written <>*0.5 in label, or an equivalent expression, for a dimension of 60.00 to become 30.00. Could this be possible?

Welcome Arthur Emmanuel!

That's a nice idea.

Thinking about it, I wonder if the <> placeholder is a LibreCAD only feature and what other CAD will do with it. Probably its origin is in QCAD, then at least QCAD will show the intended result.

Adding calculator functionality will for sure break compatibility and cause issues with shared drawings. Other software will show the formula, not the result. But this might be already the case for most other software with the current <> implementation.

I think we have to consider, that the label might contain additional text which should be shown raw with the calculated value. We have no prefix/postfix properties, thus it's the only way to add unit labels, as described in the manual (see Hint).
So we need some other kind of limiter and keep the current implementation as it is.

I suppose, that a syntax like {<>*0.5} mm can be implemented with moderate efforts.
The {...} part will be replaced and the rest is shown as is.
Keeping <> will allow to use the measured dimension anywhere in the formula.
We just need to consider how to allow the user to enter a regular { or }.
Maybe double braces can solve this like {{<>*0.5}} mm.

If you already have a GitHub account feel free to create a feature request. Otherwise I can do this for you.
Add a link to this thread for reference.

Armin

Thanks. In tests with other viewer and CAD, <> returned the numeric value.
Feel free to request the feature, LordOfBikes. I believe you will have better arguments.

trace back https://github.com/LibreCAD/LibreCAD/issues/1953

Thank you for the advancement.

QCAD uses the Linear measurement factor option in the Property Editor, which can be applied to separate dimensions, giving multiple suggested scales at the same time. In this case, LibreCAD will add a field in the properties for the individual length factor per selected dimension to give more freedom for design.