void PathsToInternalPath(Paths paths)
{
regionPath = new CGPath ();
foreach (var poly in solution)
{
regionPath.MoveToPoint(IntPointToPointF(poly[0]).ToCGPoint ());
for (var p =1; p < poly.Count; p++)
{
regionPath.AddLineToPoint (IntPointToPointF (poly [p]).ToCGPoint ());
}
}
}