[BUG?] Negative numbers in feet/inches interpreted wrong

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metatheorem
Posts: 3
Joined: Wed Apr 03, 2019 2:13 am

[BUG?] Negative numbers in feet/inches interpreted wrong

Postby metatheorem » Wed Apr 03, 2019 2:14 am

I am seeing some strange behavior when working in feet and inches in the "Building US" units.

FreeCAD is interpreting combined foot/inch values that are negative as expressions and this is giving me incorrect results.

For example, say I want to move an object one foot and four inches in the negative X direction. If I use the Draft Move tool and type this in: -1' 4" for the second point, the program will add these numbers together (-12" + 4"), moving only eight inches (-8"). I can even observe this happening by moving the focus to/from the entry field.

Is this a known issue? Is there a way to force the program not to interpret these entries as expressions?

Thanks

OS: Linux
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.Unknown
Build type: Unknown
Python version: 2.7.15
Qt version: 4.8.7
Coin version: 3.1.3
OCC version: 6.9.1.oce-0.18
Locale: English/UnitedStates (en_US)
openBrain
Posts: 3091
Joined: Fri Nov 09, 2018 5:38 pm

Re: [BUG?] Negative numbers in feet/inches interpreted wrong

Postby openBrain » Wed Apr 03, 2019 2:15 pm

Confirmed here with latest 0.18 under Windows 7.
This behavior exists :
  • Whatever is the base unit selected => You can enter -1'4" value when working in mKs, you'll get the same result
  • Whatever is the unit used in the value => You can enter -1m500mm and get same kind of result
The only way at now is entering -1'-4" but doesn't sound very natural.

@metatheorem : as a sidenote, you can read from this thread if you'd like to compile with Qt5 and OCCT7+ ;)
chrisb
Posts: 21432
Joined: Tue Mar 17, 2015 9:14 am

Re: [BUG?] Negative numbers in feet/inches interpreted wrong

Postby chrisb » Wed Apr 03, 2019 3:30 pm

openBrain wrote:
Wed Apr 03, 2019 2:15 pm
The only way at now is entering -1'-4" but doesn't sound very natural.
This doesn't work either, because it is parsed twice: once when entering the value and a second time when confirming the dialog.
openBrain
Posts: 3091
Joined: Fri Nov 09, 2018 5:38 pm

Re: [BUG?] Negative numbers in feet/inches interpreted wrong

Postby openBrain » Wed Apr 03, 2019 4:10 pm

chrisb wrote:
Wed Apr 03, 2019 3:30 pm
]This doesn't work either, because it is parsed twice: once when entering the value and a second time when confirming the dialog.
Ouch. I admit that I just tried by changing a position in the comboview. Indeed the case described by OP is another one. ;)
I can't try now but what about using something like -(1'4") ?
chrisb
Posts: 21432
Joined: Tue Mar 17, 2015 9:14 am

Re: [BUG?] Negative numbers in feet/inches interpreted wrong

Postby chrisb » Wed Apr 03, 2019 4:33 pm

openBrain wrote:
Wed Apr 03, 2019 4:10 pm
I can't try now but what about using something like -(1'4") ?
I see you had all the ideas which I had :) , but no, brackets are not accepted by the input field :cry: .
openBrain
Posts: 3091
Joined: Fri Nov 09, 2018 5:38 pm

Re: [BUG?] Negative numbers in feet/inches interpreted wrong

Postby openBrain » Wed Apr 03, 2019 5:55 pm

I tried some various things and can't find a decent workaround. Definitely sounds as a real bug...
Geoplace
Posts: 39
Joined: Tue Feb 26, 2019 9:49 pm

Re: [BUG?] Negative numbers in feet/inches interpreted wrong

Postby Geoplace » Thu Apr 04, 2019 10:25 pm

metatheorem
Posts: 3
Joined: Wed Apr 03, 2019 2:13 am

Re: [BUG?] Negative numbers in feet/inches interpreted wrong

Postby metatheorem » Thu Apr 04, 2019 10:51 pm

I've opened a bug for this: https://www.freecadweb.org/tracker/view.php?id=3925.

@openBrain: Thanks, I'm working off of a repo build right now, but will probably build if I find the time soon...