Function rotate

rotate(
    out: mat2.Mat2,
    a: readonly [number, number, number, number],
    rad: number,
): mat2.Mat2
Rotates a mat2 by the given angle
Parameters
- out: mat2.Mat2
  the receiving matrix
- a: readonly [number, number, number, number]
  the matrix to rotate
- rad: number
  the angle to rotate the matrix by
Returns mat2.Mat2
out
- Defined in core/mat2.ts:201