[vb6] Drawing transparent rectangles

You can draw rectangles fast using the Rectangle API. If you want the interior of the rectangles to be transparent, you must first select the special brush NULL_BRUSH into the device context.

    Private Const NULL_BRUSH& = 5
    Private Declare Function Rectangle& Lib "gdi32" (ByVal hdc As Long, _
        ByVal X1 As Long, ByVal Y1 As Long, _
        ByVal X2 As Long, ByVal Y2 As Long)