public static IMask RotateRight(this IMask matrix2, int r)
{
if (r < 0)
{
r = (4 + (r % 4));
}
switch (r % 4)
{
case 0: return(matrix2);
case 1: return(new Mask(matrix2.Select(p => new VectorInt2(matrix2.Size.Y - p.Y - 1, p.X))));
case 2: return(new Mask(matrix2.Select(p => new VectorInt2(matrix2.Size.X - p.X - 1, matrix2.Size.Y - p.Y - 1))));
case 3: return(new Mask(matrix2.Select(p => new VectorInt2(p.Y, matrix2.Size.X - p.X - 1))));
default: throw new Exception();
}
}
