Mathematically positioning a 2D Array of Elements

Global $iUnmarked = 0x5C5C5C
Global $iMarked = 0x0400FF

Global $iX_Origin = 20
Global $iY_Origin = 30
Global $nX_Distance = 79
Global $nY_Distance = 52.5

Global $iWidth = 45
Global $iHeight = 45

Global $iColumns = 5
Global $iRows = 8

Global $aPixel[$iColumns * $iRows]

Global $hGUI = GUICreate("Example", ($iColumns - 1) * $nX_Distance + $iX_Origin * 2 + $iWidth, ($iRows - 1) * $nY_Distance + $iY_Origin * 2 + $iHeight)
For $i = 0 To 39
    $aPixel[$i] = GUICtrlCreateButton("", Mod($i, $iColumns) * $nX_Distance + $iX_Origin, Floor($i / $iColumns) * $nY_Distance + $iY_Origin, $iWidth, $iHeight)
Next
GUISetState()

While GUIGetMsg() <> -3
WEnd