Add units to rulers (mm and in)

[carlfriess]

Adds support for millimetres and inches via options in the menubar. See screenshots below. Uses the Core Graphics API to determine the physical size of the screen and calculate the DPI.

Resolves #68.

[pascalpp]

@carlfriess thanks for this. I've been away from Free Ruler dev for a bit but i'll give this a tryout this weekend.

[jeff-h]

@carlfriess Quick question — I skimmed your new code but didn't see anything checking for when you move the rulers to a new screen. Is that handled?

[carlfriess]

Yup, it checks which NSScreen to use on every draw() call using the computed property here.

[jeff-h]

Nicely done!

[pascalpp]

@carlfriess Sorry this took me so long to test out. Works great, thank you so much! I'll try to push a new release tomorrow.

[fabulousrice]

I've just downloaded version 2.0.3 and still do not see the "Units" menu. Where are the options to change unit? Running Catalina.

https://imgur.com/HISabE4

[pascalpp]

@fabulousrice I have to push a new release with these changes. Working on it.

[fabulousrice]

Ok I understand. Since the Github feedback requests for this feature have been closed, I assumed that they were fixed in the available build (otherwise people will ask for them again...) it was unclear since there are screenshots in this conversation that show a different behavior. Thanks for your work

[pascalpp]

This is now available in https://github.com/pascalpp/FreeRuler/releases/tag/v2.0.4