AutoHotkey Community

Gui, +ToolWindow
Gui, Add, Text, w100 h20 Center vDirection
Gui, Show,, Mouse Direction
SetTimer, Update, 50
Return

Update:
MouseGetPos, X, Y
If (OldX <> X || OldY <> Y) {
   If (OldX > X)
      Direction = West
   If (OldX < X)
      Direction = East
   If (OldY < Y)
      Direction = South
   If (OldY > Y)
      Direction = North
   If (OldX > X && OldY > Y)
      Direction = NorthWest
   If (OldX > X && OldY < Y)
      Direction = SouthWest
   If (OldX < X && OldY > Y)
      Direction = NorthEast
   If (OldX < X && OldY < Y)
      Direction = SouthEast
}
MouseGetPos, OldX, OldY
GuiControl,, Direction, %Direction%
Return