rotate-90

function rotate90(ps: number[][]): number[][]

Defined in transformation/affine/rotate-90.ts:14

Returns the given bezier curve rotated anti-clockwise about the origin by exactly 90 degrees.

This is an exact special case of rotate that avoids the floating point error introduced by evaluating sin/cos of a rounded Math.PI/2. The rotation reduces to (x,y) -> (-y,x) which is exact.

0

Parameters:

Name	Type	Description
ps	number[][]	an order 0,1,2 or 3 bezier curve given as an ordered array of its control point coordinates, e.g. [[0,0], [1,1], [2,1], [2,0]]