AVCamBarcode.PreviewView.CornerOfRect C# (CSharp) Метод

		ControlCorner CornerOfRect (CGRect rect, CGPoint point)
		{
			var closestDistance = nfloat.MaxValue;
			var closestCorner = ControlCorner.None;
			Tuple<ControlCorner, CGPoint> [] corners = {
				Tuple (ControlCorner.TopLeft, rect.CornerTopLeft()),
				Tuple (ControlCorner.TopRight, rect.CornerTopRight ()),
				Tuple (ControlCorner.BottomLeft, rect.CornerBottomLeft ()),
				Tuple (ControlCorner.BottomRight, rect.CornerBottomRight())
			};

			// corner, cornerPoint
			foreach (var tpl in corners) {
				var corner = tpl.Item1;
				var cornerPoint = tpl.Item2;

				var dX = point.X - cornerPoint.X;
				var dY = point.Y - cornerPoint.Y;
				var distance = NMath.Sqrt ((dX * dX) + (dY * dY));

				if (distance < closestDistance) {
					closestDistance = distance;
					closestCorner = corner;
				}
			}

			if (closestDistance > regionOfInterestCornerTouchThreshold)
				closestCorner = ControlCorner.None;

			return closestCorner;
		}