rotatedTextSize function Null safety

Rect rotatedTextSize(
  1. Size size,
  2. int angle
)

This method returns the rect for given size and angle

Implementation

Rect rotatedTextSize(Size size, int angle) {
  final Rect rect = Rect.fromLTWH(0, 0, size.width, size.height);
  final vector.Matrix2 _rotatorMatrix =
      vector.Matrix2.rotation(degreeToRadian(angle));

  final Rect movedToCenterAsOrigin = rect.shift(-rect.center);

  Offset _topLeft = movedToCenterAsOrigin.topLeft;
  Offset _topRight = movedToCenterAsOrigin.topRight;
  Offset _bottomLeft = movedToCenterAsOrigin.bottomLeft;
  Offset _bottomRight = movedToCenterAsOrigin.bottomRight;

  _topLeft = transform(_rotatorMatrix, _topLeft);
  _topRight = transform(_rotatorMatrix, _topRight);
  _bottomLeft = transform(_rotatorMatrix, _bottomLeft);
  _bottomRight = transform(_rotatorMatrix, _bottomRight);

  final List<Offset> rotOffsets = <Offset>[
    _topLeft,
    _topRight,
    _bottomLeft,
    _bottomRight
  ];

  final double minX =
      rotOffsets.map((Offset offset) => offset.dx).reduce(math.min);
  final double maxX =
      rotOffsets.map((Offset offset) => offset.dx).reduce(math.max);
  final double minY =
      rotOffsets.map((Offset offset) => offset.dy).reduce(math.min);
  final double maxY =
      rotOffsets.map((Offset offset) => offset.dy).reduce(math.max);

  final Rect rotateRect = Rect.fromPoints(
    Offset(minX, minY),
    Offset(maxX, maxY),
  );
  return rotateRect;
}