Feature #7317: Calculate Area of Arbitrary Faces (was Techdraw Problem Calculating Area)

[Creative25]

When trying to calculate an area I get the following error.

12:23:18 <Exception> CmdTechDrawAreaAnnotation - forbidden border element found

[kisolre]

So maybe, just maybe there is a forbidden border element somewhere? Like a zero length line, self intersecting spline, ...? How could anyone guess without a file, FC version info, steps to reproduce? Seen the IMPORTANT banner and link on top of the page?

[Creative25]

Thanks for letting me know that my poest was not specific.
Original File was too large for uploading.
That is why I left it out.
I have small Drawing that has the same problem.
I upload this one.

Code: Select all

OS: macOS 10.16
Word size of FreeCAD: 64-bit
Version: 0.20.29177 (Git)
Build type: Release
Branch: (HEAD detached at 0.20)
Hash: 68e337670e227889217652ddac593c93b5e8dc94
Python 3.9.13, Qt 5.12.9, Coin 4.0.0, Vtk 9.1.0, OCC 7.5.3
Locale: C/Default (C)
Installed mods: 
  * parts_library

SampleRoom.FCStd

(123.43 KiB) Downloaded 24 times

[NewJoker]

Faces with curved edges are not supported: TechDraw ExtensionAreaAnnotation and in your case there are such edges (doors).

[Creative25]

Thanks for th info.
So I deleted the door and it works.
But now my question ist the sample also contains doors but only the opening lines are shown, how do I go about to make it work like the example on the link?

[wandererfan]

But now my question ist the sample also contains doors but only the opening lines are shown, how do I go about to make it work like the example on the link?

AreaAnnotation is only smart enough to handle polygons at the moment. The curved arc of the door opening confuses it.

AreaAnnotation should be smart enough to take a list of any faces and return the area. There might still be an issue with the door.

I've created issue #7317 so this doesn't get forgotten.

[Creative25]

So at the moment it is a limitation?

A nice simple feature would be if you could select the corners of an area and then press calculate.

[Kunda1]

Anyone interested implementing this before v0.21 feature freeze ?