Viewport Dimension and Text Scaling

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Neon
Registered Member
Posts: 1
Joined: Wed Dec 24, 2025 1:21 am

Viewport Dimension and Text Scaling

Post by Neon » Wed Dec 24, 2025 1:52 am

Hi all,

I’m having some trouble getting my dimensions and text to look the same size in different viewports on a layout.

On one layout page I’ve got two viewports at different scales (1:2 and 1:5). The dimensions are in model space, and the text height shows up larger in the 1:2 viewport and much smaller in the 1:5 one. I also tried a 1:10 viewport and the text is basically unreadable.

What I’m trying to do is have the dimension/text look the same on paper (same printed height) no matter what scale the viewport is using.

Setup is:
  • QCAD Professional 3.32.4.0
    Windows 11
    File is attached to this post
Is there a trick or recommended workflow in QCAD for this (for example, dimensioning in the layout instead of model space, or some setting I’ve missed)?
Attachments
2323 Curve End Details.dxf
(185.18 KiB) Downloaded 23 times
QCad Viewports.png
QCad Viewports.png (143.21 KiB) Viewed 4380 times

CVH
Premier Member
Posts: 5097
Joined: Wed Sep 27, 2017 4:17 pm

Re: Viewport Dimension and Text Scaling

Post by CVH » Wed Dec 24, 2025 4:56 am

Hi, and welcome to the QCAD forum.

A Dimension text height of 2.5 on paper in scale 1:1 is of course 2.5 units high.
At scale 1:2 it is 1.25 high, and in scale 1:10 it is very tiny. :wink:

I think that the trick is to draw the dimensions on the Layout.
The linear measurement factor is automatically adapted for the related Viewport scale.
It will thus be 4,12,16,20 and 100 units for both Viewports measured on Layout1.

Model_Space is all about the model geometry.
A Layout is intended for the page layout, perhaps with a border and all that you want to include beside the geometry.

The why ... Remark that for the 4 units Dimension, the text doesn't fit any longer as 2.5 high.
Things may look better when rearranged.
Also typical is that blown up detail Viewports display (more) dimensions of the details ...
... And large overviews only display overall dimensions.

Catch 22: Changing a Viewport entity its properties in a later stage (scale, position, displayed area, ...) ...
... Does not affect the (floating) drawing entities or dimensions.
There is almost no associative nature between entities under QCAD.


Regards,
CVH

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