Get distance between two points for tile based game

Some people that are making tile based games might be interested in the distance formula. The formula returns how many tiles it takes to get from one point to another on a grid. Most of you probably know this already, but here it is anyway..

VB Code:

Private Function Distance(X1 As Long, Y1 As Long, X2 As Long, Y2 As Long) As Long
 
    Distance = (X2 - X1) + (Y2 - Y1)
 
End Function

For instance, if you wanted to determine the distance between tiles (2,8) and (9,14), you would use the formula like this..

VB Code:

Distance 2, 8, 9, 14

That would then return 13 which is how many tiles it takes to get from point (2, 8) to point (9, 14). So for those who care, there it is.

Uhm.. that's wrong isn't it?

VB Code:

Private Function Distance(X1 As Long, Y1 As Long, X2 As Long, Y2 As Long) As Long
    Distance = Sqr( (X2 - X1)^2 + (Y2 - Y1)^2 )
End Function

Well this formula is the distance if you move straight on to point #2..

That wouldn't matter if he's doing a typical grid-confinement RPG. I say good work on the function! If you are using a free-roaming (you can be on more than one tile at a time) then you should use Fox's.

Yeah, mine didn't incorporate diagonal movement.