[Feature Request] Snap horizontal/vertical during image plane "Calibrate" function

[brandonbeaumia]

Is there an existing issue for this?

• I have searched the existing issues

Version

0.21 (Release)

Full version info

[code]
OS: KDE Flatpak runtime (pop:GNOME/pop)
Word size of FreeCAD: 64-bit
Version: 0.21.0.33675 (Git)
Build type: Release
Branch: (HEAD detached at 41b058e)
Hash: 41b058e2087de60dc8fef3d3e68c7d0129e13abf
Python 3.10.11, Qt 5.15.10, Coin 4.0.0, Vtk 8.2.0, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods: 
  * Assembly4 0.50.2
  * ExtremeProDark 2.9.0
  * fasteners 0.4.56
  * Dracula 0.0.4
[/code]

Subproject(s) affected?

None

Problem description

When interactively calibrating an image plane, the start and stop points are often being matched to a horizontal or vertical dimension already in the image. It would help increase the precision of calibration if it was possible to maintain a vertical/horizontal line during calibration instead of manually aligning in X and Y at the same time.

This could be accomplished by holding a modifier key while dragging the end of the line, and documented in half a sentence right under the Calibrate button in the Image Plane task panel.

Alternatively, it could be accomplished by changing the "Calibrate" button to a set of three buttons:
"Calibrate with Distance" (works as is)
"Calibrate with Horizontal Distance" and
"Calibrate with Vertical Distance"

I feel like the modifier key is more elegant as long as it's easily discoverable, but either of these could work.

Anything else?

No response

Code of Conduct

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