[okular] [Bug 436214] Measure distances (and areas?)

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=436214

vderuido at gmail.com changed:

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                 CC|                            |vderuido at gmail.com

--- Comment #2 from vderuido at gmail.com ---
Hi!

I totally support this initiative. There is really a lack for this type of
functionality in Linux.

Unfortunately, I don't have the coding skills to do this myself, but I have
used software with this functionality at my job and I can give some feedback on
how the user experience usually is (to hopefully help to someone actually make
it true :) ).

Usually there are 2 types of ways for performing measurements into a document:

## Option 1 ("Easy")
- The user selects the "calibration button"
- The user picks two points in the document
- A popup window appears asking the user for introducing the distance of those
2 points (in a drop-down  menu you can select the unit)  
- Okular extracts the distance between 2 points and "calibrates" the document
accordingly (using the dimensions of the page of the document)
- The user now can select the "measure" button where two new points can be
selected and obtain the desired the distance.

## Option 2 (Probably more tricky)
- In the "calibrate" option there are a set of default scales the user can pick
from (1:50, 1:100, etc. specifying the units, of course)
- Knowing the dimensions of page, the calibration is set up and the user can
measure as above.

Once is developed the functionality can be extended in the future using with
extra calculations such as simple areas (squares, circles), the perimeter of a
polyline/polygone, etc.

I'm aware that this is easier said than done, but I think quite some people
could benefit from this!

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