How to calculate angle in degrees between two points?

Watchface Design Expression Help
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Can anyone advise on how to calculate the angle between two points?
For example the angle between 160,0 and 160,160 would be 0 degrees.

My research into this has all found that the function acos() is required https://byjus.com/angle-between-two-vectors-formula/. This page talks about atan2() https://stackoverflow.com/questions/2676719/calculating-the-angle-between-the-line-defined-by-two-points

There is another way using Diamond Angles but there are various thoughts on whether it will work for us https://stackoverflow.com/questions/1427422/cheap-algorithm-to-find-measure-of-angle-between-vectors

Has anybody successfully calculated angles in the free version?

Thanks

Dave

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I’ve seen questions like this before: [PROBLEM] Simple Line Between Point A and Point B
Based on that I had a go as well a while back. Atan/acos/asin seem to work in designer but not on a watch (at least not on mine). I have used this post to get an approximate atan (it has the asin/acos as well): Inverse trigonometric functions
I can confirm the atan function works, in my test design I calculate the angle and the length of the line. The red line is using the built in atan in designer, the green/blue line is using the expresion from the post above (inspection enabled, open the iframe in a seperate tab to see it). It is linked to #BLE# so it goes from 100 to 0 in 24 hours:

1 Like
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That’s great ThaMattie thanks for the help.

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NP, I like a challenge, and math :stuck_out_tongue:
Hope you show off what you’re doing with this :wink: