Lock rotation of sprite to 4 values?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By TheMadScientist1234

What I mean by this is the rotation_degrees of the sprite will snap to 0, 90, 180, 270 depending on what value I want to set it to. The goal is to have an enemy look_at(player.position) and yet it stays rotated at 90 degree intervals.

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:bust_in_silhouette: Reply From: NaughtyGnosiophile

This might not be the most efficient way, but it should work:

#These are your snap vectors
var up = Vector2(0,-1)
var down = Vector2(0,1)
var left = Vector2(-1,0)
var right = Vector2(1,0)

#This will give you the vector to the player
var look_vector = player.position - enemy.position

#The take the dot product of this vector to each of the snap vectors.
#The one with the biggest dot product is the "most parallel".

var snap_vector = up
var max_dot_product = look_vector.dot(up)

var dot_product = look_vector.dot(down)
if dot_product > max_dot_product:
   max_dot_product = dot_product
   snap_vector = down

dot_product = look_vector.dot(right)
if dot_product > max_dot_product:
   max_dot_product = dot_product
   snap_vector = right

dot_product = look_vector.dot(left)
if dot_product > max_dot_product:
   max_dot_product = dot_product
   snap_vector = left

#You will end up with the closest snap_vector at the end

Thanks! It worked perfectly!

TheMadScientist1234 | 2018-10-18 15:39