Public Structure vector
  'members...
  Public Magnitude As Double
  Public Direction As Double
  Public ID As Element
  'Public Parity As Integer
  'Public Radius As Integer
  'Public Colour As Integer
  'parity is a property of the end point
  'direction is the angle turned at the end of the vector.
  'parity determines how vectoirs can be placed next to each other
  'radius gives the radius of the arc to be drawn round each vertex (0 = none, 1-15 = black spot, >15 = white arc)
End Structure
