How do i implement 8 direction swipe function

adrian_p · April 24, 2018, 1:57am

hey guys,
I am trying to implement swipe functions into my game, so essentially determining whether the person swipes N, NE, E, SE, S, SW, W, NW and then outputting into a function based on the direction they swipe.

I have figured out how to do N, E, S, W (up, down, left, right)
however, I am stuck on the diagonal functions. (NE,SE,SW,NW)

Hope that makes sense, Thanks guys

goncasmage · April 24, 2018, 4:25pm

Subtract the position the player concluded the swipe in with the position he started the swipe in (you already do this)
Check the angle between that Vector2D and the (1 ,0) Vector2D. You can do this by using the DotProduct: https://answers.unrealengine.com/questions/31058/how-to-get-an-angle-between-2-vectors.html?sort=oldest
Use this image to calculate the direction:

adrian_p · April 26, 2018, 11:05am

ok so i tried the acos approach and it didnt seem to be working out so i done some research and tried the atan2 function instead with the broken up X & Y values and now works perfectly. thank you so much for your help