snap to grid

Anyone know of any API or any way of easily coding a 'snap to grid' feature?

I wrote a maze designer for a game, and it does it.
Take what you need.

http://members.fortunecity.com/plend...20Designer.zip

just in case you dont want to find the stuff for yourself ;

Code:

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Private Const SnapValue As Long = 20
Private MouseX As Single
Private MouseY As Single

Private Sub pictureBox1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    MouseX = RoundTo(SnapValue, X)
    MouseY = RoundTo(SnapValue, Y)
    pictureBox1.Cls
    pictureBox1.Circle (MouseX - 1, MouseY - 1), 2, vbRed
End Sub

Private Function RoundTo(NumberToRoundTo As Long, NumberToRound) As Long
    If (NumberToRound < NumberToRoundTo) Then
        If (NumberToRound < (NumberToRoundTo / 2)) Then
            RoundTo = 0
        Else
            RoundTo = NumberToRoundTo
        End If
    Else
        For i = 2 To NumberToRound
            If (NumberToRound < (NumberToRoundTo * i)) Then
                If (NumberToRound < ((i * NumberToRoundTo) - (NumberToRoundTo / 2))) Then
                    RoundTo = (i * NumberToRoundTo) - NumberToRoundTo
                    Exit For
                ElseIf (NumberToRound > ((i * NumberToRoundTo) - (NumberToRoundTo / 2))) Then
                    RoundTo = (i * NumberToRoundTo)
                    Exit For
                End If
            End If
        Next i
    End If
End Function

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Thank you - that is perfect