invert method

Transform2D? invert()

Returns the inverse transform, or null if the matrix is singular.

Implementation

Transform2D? invert() {
  final det = a * d - b * c;
  if (det == 0) return null;
  final invDet = 1.0 / det;
  final invA = d * invDet;
  final invB = -b * invDet;
  final invC = -c * invDet;
  final invD = a * invDet;
  final invTx = -(invA * tx + invC * ty);
  final invTy = -(invB * tx + invD * ty);
  return Transform2D(
    a: invA,
    b: invB,
    c: invC,
    d: invD,
    tx: invTx,
    ty: invTy,
  );
}