editor / quarterTurn

Function: quarterTurn()

quarterTurn(vector): Vector

Defined in: math/quarter-turn.ts:14

Vector turned by a quarter turn in the positive direction of angles.

Formula: (x, y)⊥ = (−y, x), the rotation matrix with θ = π/2. In the SVG frame (y down), the positive direction is clockwise on screen.

Parameters

vector

Vector

vector to turn

Returns

Vector

the turned vector, same length

Kind

math

See

REF-MATHWORLD-ROTATION-MATRIX