private void DetermineControlPointDirections()
{
var firstRow = ControlPoints.Where(c => c.V == 0).ToArray();
var firstCol = ControlPoints.Where(c => c.U == 0).ToArray();
ControlPoints.ToList().ForEach(c => c.AllowAllDirections());
firstRow.ToList().ForEach(c => c.ControlPointDirections &= ~ControlPointDirections.Up);
firstCol.ToList().ForEach(c => c.ControlPointDirections &= ~ControlPointDirections.Left);
ControlPoints.Where(c => c.V == _resolution.Height - 1).ToList().ForEach(c => c.ControlPointDirections &= ~ControlPointDirections.Down);
ControlPoints.Where(c => c.U == _resolution.Width - 1).ToList().ForEach(c => c.ControlPointDirections &= ~ControlPointDirections.Right);
}
