[Solved] Sketch Angle Constraints Wrong Reference Reading?

[paullee]

Hi, puzzling for a while. There are a few angle Constraints in the sketch below as reference.

A point move around and the angles update as reference.

At some particular cases, see screencapture for the one captured, a reading return 11.76 deg though it is apparently 2 lines bigger than 90 degrees. The reference provide wrong reading frustrate subsequent calculation / expression.

Interestingly, when the file is untouched and re-opened, it reads (I am not sure if re-opening the sketch w/o closing the file do the same thing) -168.xx degree which is the correct reading. Anything missing or could be done? Thanks.
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Screenshot from 2017-12-24 10-57-58.png (177 KiB) Viewed 2465 times

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Screenshot from 2017-12-24 11-00-42.png (174.61 KiB) Viewed 2465 times

[EDIT]
OS: Linux
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.12852 (Git)
Build type: None
Branch: master
Hash: 8e3b2d7e84924444bc219133a7e0bbd07413cf4f
Python version: 2.7.6
Qt version: 4.8.6
Coin version: 4.0.0a
OCC version: 7.1.0
Locale: English/UnitedStates (en_US)

[chrisb]

Which version do you use? Did you try a Force_Recompute (0.16) or the built-in recompute for the whole document (0.17)?

[chrisb]

Here everything seems to be ok. Which point are you actually dragging?
Have you checked the "Improve solving while dragging"-box in the preferences?

OS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.12851 (Git)
Build type: Release
Branch: (HEAD detached at 394ae19)
Hash: 394ae197fbe082ee32321b60bcae579262fa6df0
Python version: 2.7.14
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.1.0
Locale: German/Germany (de_DE)

OS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6712 (Git)
Build type: Release
Branch: releases/FreeCAD-0-16
Hash: da2d364457257a7a8c6fb2137cea12c45becd71a
Python version: 2.7.11
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17

[paullee]

Here everything seems to be ok. Which point are you actually dragging?
Have you checked the "Improve solving while dragging"-box in the preferences?

Oops, forgot the version
on mobile now, lateest Appimage git 12852

it is random, just drag the central point with a bunch of construction lines attached to it.

lot of time constraint a4 has problem

Note when it is Wong,. It report the complementary angle i.e.,-ve (180 - correct angle)

[chrisb]

I can reproduce it when moving the center - before I tried only the two points. The wrong angle is corrected as soon as I hit the recompute button.

[chrisb]

Saving triggers the recompute as well. After closing and reopening the sketch it shows the correct angle. Is this the same at yours?

[paullee]

I can reproduce it when moving the center - before I tried only the two points. The wrong angle is corrected as soon as I hit the recompute button.

not always corrected upon recompute in my version / test.

Afterall, should be bug, no good need recompute especially as those reference datum is refered in other
expression, giving wrong result unknown to user.

[chrisb]

If it's not corrected at the closing recompute it's a bug.

[paullee]

issue #0003288

Thanks! Reported to bugtracker.

https://www.freecadweb.org/tracker/view.php?id=3288

[wmayer]

There a few more oddities:

• when deleting the angle constraint (Constraint23) then an error message comes up:
  Duplicate constraint not allowed
• when selecting the two edges of the deleted angle constrained and trying to add a new constraint results into a heap corruption