Scaling up and down

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petert
Newbie Member
Posts: 6
Joined: Fri May 06, 2022 4:56 pm

Scaling up and down

Post by petert » Thu Mar 23, 2023 5:56 pm

Hello,

I use Big Sur 11.5.1 on a Mac with an M1. I run QCAD Pro.

I have an existing dimensioned drawing that I would like to scale up and down. Is there a way to select one measurement on the existing drawing and change it and have all other dimensions scale equally?

Peter

CVH
Premier Member
Posts: 3418
Joined: Wed Sep 27, 2017 4:17 pm

Re: Scaling up and down

Post by CVH » Thu Mar 23, 2023 6:52 pm

Peter,
petert wrote:
Thu Mar 23, 2023 5:56 pm
Is there a way to select one measurement on the existing drawing and change it and have all other dimensions scale equally?
No, that is not possible.
What you need to do is scale everything with a given or calculated factor.

First about the source:
A dimension is a rounded value and the length property of a line in the Property Editor is also a rounded value.
Using a rounded value in a factor is only about right.
It will be correct if the value has fewer significant digits than the displayed precision.

Here is a tutorial on how we can work with variables:
https://www.ribbonsoft.com/en/tutorial- ... easurement

A right click on the Command Line also lets you create a variable with the exact value.
The variable stays valid during whole the current QCAD session.

What current size you want to use is of your choice.
We can then scale all things with a factor based on the required size divided by the current size.

Menu Select .. Select All (TA)
Menu Modify .. Scale (SZ)
Indicate the scaling origin.
In the dialog opt for Delete original; Proportional; Not using current layer and attributes
In the Factor x field enter the equation based on the two sizes or the required divided by the measured variable.

Regards,
CVH

petert
Newbie Member
Posts: 6
Joined: Fri May 06, 2022 4:56 pm

Re: Scaling up and down

Post by petert » Fri Mar 24, 2023 8:47 pm

Success!

Thanks for your help,

Peter

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