Normalized perpendicular

[bstro]

Hi there, Vecti looks fantastic. I'm trying to adapt this stackoverflow suggestion to your API:

What I'm trying to achieve: Given line AB, how do I calculate points C and D?

So far, I have:

const A = new Vector(x1, y1);
const B = new Vector(x2, y2);
const AB = B.subtract(A);

My question is, how can I calculate the normalized perpendicular of line AB? Its been a long since precalculus :D

[DerYeger]

Hi, this shouldn't be too difficult!

You could use this StackOverflow answer, or use Vecti's methods as seen below:

const b = new Vector(x1, y1);
const c = new Vector(x2, y2);
const aToB = B.subtract(A);

const orth = aToB.rotateByDegrees(90).normalize()

// Multiple by (-1) * 6 / 2 to get C, 6 / 2 to get D
const c = b.add(orth.multiply(-3))
const d = b.add(orth.multiply(3))

Let me know if this works, I wrote it off the top of my head.

[bstro]

That did it! Thanks a bunch! 🥇

[DerYeger]

That did it! Thanks a bunch! 🥇

Glad I could help!