Protected Overridable Function GetLinkDirection( _
   ByVal node As Node, _
   ByVal port As FrameworkElement, _
   ByVal linkpoint As Point, _
   ByVal spot As Spot, _
   ByVal from As Boolean, _
   ByVal ortho As Boolean, _
   ByVal othernode As Node, _
   ByVal otherport As FrameworkElement _
) As Double

protected virtual double GetLinkDirection( 
   Node node,
   FrameworkElement port,
   Point linkpoint,
   Spot spot,
   bool from,
   bool ortho,
   Node othernode,
   FrameworkElement otherport
)

Parameters

node

port

the FrameworkElement representing a port on the node

linkpoint

spot

a Spot value describing where the link should connect

from

true if the link is coming out of the port; false if going to the port

ortho

whether the link should have orthogonal segments

othernode

the node at the other end of the link

otherport

the FrameworkElement port at the other end of the link

Return Value

If the spot is a specific spot or is a side, this will return the corresponding multiple of 90 degrees. For example, the spot Spot.MiddleLeft will return 180 and a spot near the bottom will return 90. For spots that are exactly toward the corners, this will return a multiple of 45 degrees. For example, the spot Spot.BottomLeft will return 135.

If Route.FromEndSegmentDirection or Route.ToEndSegmentDirection is LinkEndSegmentDirection.RotatedNode or LinkEndSegmentDirection.RotatedNodeOrthogonal, these values are rotated according to the Node.RotationAngle.

Reference