fwiw, if you instead rotate your art to "point to" the right, then it'll match trig, and you probably wouldn't need your clock-face system.
Thanks Dave. I know that I could to that... but, for me it just seems weird.
When I think in terms of the game world, specifically shooters and action games like 1942, lunar lander, etc., the top of the screen is UP. Up is also the primary facing so it is ideal to make that 0-degrees.
If we further consider that 0-degress is the default rotation in corona and by positive values we rotate to the right... this all comes together and leads me to the orientation choices I outline above.
Having < 1, 0 > as 0-degrees is just weird for me.
I tend to use the math as a tool to get the results I want or that fit the rules of the 'world' I'm operating in.
Whatever the case, I admit freely, you're a much more math savvy individual than I am. I know the general ideas and can find the solutions, but I get the sense you remember the fundamental rules and operations better than I do.
PS - I'll stop now ... I feel I've started hijacking this thread.
Edited by roaminggamer, 04 May 2018 - 10:44 AM.