[Solved] - Curve length measurements ?

[Gift]

Ok let me clarify my question again :

(see new image )

I DO NOT wish to measure the distance between two curves/arcs.

I wish to measure the distance of a curved edge/line.

The curve is not a circle or a geometric shape where I can measure or calculate the curved distance.


R.

Q3.jpg

The distance is not a const. Do you want get the normal from a point of the curve and calculate the distance to other curve?

[raminee]

I just want to measure how long is the green line in the previous image .
Imagine if you were to stretch the green line into a straight line then what would be the length of it.

R.

[Vincent B]

GeomInfo in Curves Wb.

[raminee]

YES !!!!!!

THANK YOU Vincent B !!!!

[adrianinsaval]

I have done the python command sub.Length, as suggested earlier by drmarco, but it just gives me the following error

Traceback (most recent call last):
File "<input>", line 1, in <module>
NameError: name 'sub' is not defined

you are most likely using an outdated version of FreeCAD, the current stable release is 0.20. Please follow the guidelines in the big red banner above when asking for help and post your full FreeCAD info.
Anyways, the curves workbench solution is likely a more user friendly option.

[drmacro]

I have done the python command sub.Length, as suggested earlier by drmarco, but it just gives me the following error

Traceback (most recent call last):
File "<input>", line 1, in <module>
NameError: name 'sub' is not defined

Select the edge
hit Ctrl+Shift+P If you don't do this then the object "sub" will not exist and this is the error you see.
now in the Python console: sub.Length

But, the Curves workbench is probably better for you.

[domad]

......

A very practical alternative to classic measurement tools is to draw precise lines, using the snaps functions, then read the length from the parameters panel, once the reading is finished, delete them or include them in a Group folder.

[raminee]

I updated the FreeCAD version and now sub.Length works as well.

Thank you all for your support.

Now onto my next question in another upcoming post

R.

[edwilliams16]

Try again, it should work. If not, upload the file and tell us which edge you are selecting. Also tell us what shows up in the Python Console after you typed Ctrl-Shift-P (Command-Shift-P on a Mac)

Select the edge.
type Ctrl+Shift+P
go to the python console and type: sub.Length
hit enter and see the length.

EDIT: Missed the previous answers somehow.

[chrisb]

Thank you all for your support.

Would you mind changing th subject of the first post, which is also the title of the topic? The native speakers may correct me, but you are not asking for a distance, but rather for the length of a curve. (A distance is always the measure to some other thing.)