system
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Topic was automatically imported from the old Question2Answer platform. 

Asked By 
duronrulez 
Example image: https://imgur.com/KT14qbz
I have the values of A, B,C known i want to be able to place points like D, E on the perpendicular.
Essentially im trying to place points on that perpendicular that are X away from A.
What would the formula for those be?
system
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Reply From: 
jgodfrey 
There’s any number of ways to get a rotated vector. Here’s one…
var dist = 2
var v1 = Vector2(10, 10)
var v2 = v1.rotated(90 * PI / 180).normalized() * dist
var v3 = v1.rotated(90 * PI / 180).normalized() * dist
print(v1)
print(v2)
print(v3)
There, dist
is the distance along the rotated vectors to project your points (X away from A in your description).
v1
is the original vector (AB in your description)
v2
and v3
are the rotated (+90 and 90 degrees) vectors, of length dist