untransform method

CustomPoint<num> untransform(
  1. CustomPoint<num> point,
  2. double? scale
)

Implementation

CustomPoint untransform(CustomPoint point, double? scale) {
  scale ??= 1.0;
  final x = (point.x / scale - b) / a;
  final y = (point.y / scale - d) / c;
  return CustomPoint(x, y);
}