rotated method
Returns a mutable view onto the matrix rotated clockwise by multiples of 90 degrees.
Implementation
Matrix<T> rotated({int count = 1}) {
var self = this;
if (self is RotatedMatrix<T>) {
count += self.count;
self = self.matrix;
}
count = count % 4;
return count == 0 ? self : RotatedMatrix(self, count);
}