Store and change scale (e.g. 1:250) for technical drawings

Can you try to explain a bit more exactly what you want. Do you mean that you want the units on the rulers (and for the size of objects) to be scaled, so that a small distance on the page corresponds to a large distance in real life (like an engineering diagram?)

Hi Tom,

thx for taking care on me ;)
Well it would be great if i have e Dialog were i can the Scale of a complete Drawing on the Fly
from one to the other scale.
eg. i have a drawing in a Scale of 1:87 and want it to change the whole thing in 1:120
every thing have to be smaller on my working sheet about 72.5% this is done usually by the
transformation dialog Scale. and a good add one will be common fixed scales of model constructing
factors like: 1:220, 1:160, 1:120, 1:87, 1:72, 1:64, 1:45, 1:32, 1:25, 1:22,5, 1:16
This should be covering the most used scales. It would be great to have Buttons for this factors and
converting on the fly.

Thanks for your support and a fantastic done Job!
Martin

PS:I got a bunch of other ideas in the pocket ;)

Select everything, use Object->Transform and type in a scale of 72.5%.

You can work out the correct scaling factor for the 1:87->1:120 conversion by dividing 87 by 120; same for other conversions, e.g. to convert 1:16->1:220 you divide 16 by 220 and use the result in the Transform dialog (after multiplying by 100%). I don't think this is complex enough or used often enough to warrant a new set of buttons.

It could eventually be implemented as an extension, but it's such a basic mathematical operation that I guess anyone doing scale models will be able to work it out for themselves.

I agree with Krzystof, I do think that such a feature will be used by a significant proportion of Inkscape's user base. Imho this request is out of scope for Inkscape and it quite probably will not fit in the GUI (you would need another button/selector for scales).

I propose to either close this report, or make the zoom entry field allow entering basic mathematical expressions (Bug #171282)

Please read "I do think" in previous comment as "I do not think".