How to use the domdiv.draw.CardPlot.tabStartSide function in domdiv

CardPlot.tabNumber = tabNumber if tabNumber is not None else CardPlot.tabNumber
        CardPlot.cardWidth = cardWidth if cardWidth is not None else CardPlot.cardWidth
        CardPlot.cardHeight = cardHeight if cardHeight is not None else CardPlot.cardHeight
        CardPlot.tabWidth = tabWidth if tabWidth is not None else CardPlot.tabWidth
        CardPlot.tabHeight = tabHeight if tabHeight is not None else CardPlot.tabHeight
        CardPlot.lineType = lineType if lineType is not None else CardPlot.lineType
        CardPlot.tabStartSide = start if start is not None else CardPlot.tabStartSide
        CardPlot.tabSerpentine = serpentine if serpentine is not None else CardPlot.tabSerpentine
        CardPlot.wrapper = wrapper if wrapper is not None else CardPlot.wrapper
        # LEFT        tabs        RIGHT
        # +---+ +---+ +---+ +---+ +---+
        # | 1 | | 2 | | 3 | |...| | N |   Note: tabNumber = N, N >=1, 0 is for centred tabs
        # +   +-+   +-+   +-+   +-+   +

        # Setup first tab as well as starting point and direction of increment for tabs.
        if CardPlot.tabStartSide == CardPlot.RIGHT:
            CardPlot.tabStart = CardPlot.tabNumber
            CardPlot.tabIncrementStart = -1
        elif CardPlot.tabStartSide == CardPlot.CENTRE:
            # Get as close to centre as possible
            CardPlot.tabStart = (CardPlot.tabNumber + 1) // 2
            CardPlot.tabIncrementStart = 1
        else:
            # LEFT and anything else
            CardPlot.tabStartSide = CardPlot.LEFT
            CardPlot.tabStart = 1
            CardPlot.tabIncrementStart = 1

        if CardPlot.tabNumber == 1:
            CardPlot.tabIncrementStart = 0
        CardPlot.tabIncrement = CardPlot.tabIncrementStart

# LEFT        tabs        RIGHT
        # +---+ +---+ +---+ +---+ +---+
        # | 1 | | 2 | | 3 | |...| | N |   Note: tabNumber = N, N >=1, 0 is for centred tabs
        # +   +-+   +-+   +-+   +-+   +

        # Setup first tab as well as starting point and direction of increment for tabs.
        if CardPlot.tabStartSide == CardPlot.RIGHT:
            CardPlot.tabStart = CardPlot.tabNumber
            CardPlot.tabIncrementStart = -1
        elif CardPlot.tabStartSide == CardPlot.CENTRE:
            # Get as close to centre as possible
            CardPlot.tabStart = (CardPlot.tabNumber + 1) // 2
            CardPlot.tabIncrementStart = 1
        else:
            # LEFT and anything else
            CardPlot.tabStartSide = CardPlot.LEFT
            CardPlot.tabStart = 1
            CardPlot.tabIncrementStart = 1

        if CardPlot.tabNumber == 1:
            CardPlot.tabIncrementStart = 0
        CardPlot.tabIncrement = CardPlot.tabIncrementStart

def tabSetup(tabNumber=None, cardWidth=None, cardHeight=None, tabWidth=None, tabHeight=None,
                 lineType=None, start=None, serpentine=None, wrapper=None):
        # Set up the basic tab information used in calculations when a new CardPlot object is created.
        # This needs to be called at least once before the first CardPlot object is created and then it
        # needs to be called any time one of the above parameters needs to change.
        CardPlot.tabNumber = tabNumber if tabNumber is not None else CardPlot.tabNumber
        CardPlot.cardWidth = cardWidth if cardWidth is not None else CardPlot.cardWidth
        CardPlot.cardHeight = cardHeight if cardHeight is not None else CardPlot.cardHeight
        CardPlot.tabWidth = tabWidth if tabWidth is not None else CardPlot.tabWidth
        CardPlot.tabHeight = tabHeight if tabHeight is not None else CardPlot.tabHeight
        CardPlot.lineType = lineType if lineType is not None else CardPlot.lineType
        CardPlot.tabStartSide = start if start is not None else CardPlot.tabStartSide
        CardPlot.tabSerpentine = serpentine if serpentine is not None else CardPlot.tabSerpentine
        CardPlot.wrapper = wrapper if wrapper is not None else CardPlot.wrapper
        # LEFT        tabs        RIGHT
        # +---+ +---+ +---+ +---+ +---+
        # | 1 | | 2 | | 3 | |...| | N |   Note: tabNumber = N, N >=1, 0 is for centred tabs
        # +   +-+   +-+   +-+   +-+   +

        # Setup first tab as well as starting point and direction of increment for tabs.
        if CardPlot.tabStartSide == CardPlot.RIGHT:
            CardPlot.tabStart = CardPlot.tabNumber
            CardPlot.tabIncrementStart = -1
        elif CardPlot.tabStartSide == CardPlot.CENTRE:
            # Get as close to centre as possible
            CardPlot.tabStart = (CardPlot.tabNumber + 1) // 2
            CardPlot.tabIncrementStart = 1
        else:

elif CardPlot.tabNumber == 1:
            self.tabIndex = self.tabIndexBack = 1  # There is only one tab, so can only use 1 for both sides
        elif 1 <= self.tabIndex <= CardPlot.tabNumber:
            self.tabIndexBack = CardPlot.tabNumber + 1 - self.tabIndex
        else:
            # For anything else, just start at 1
            self.tabIndex = self.tabIndexBack = 1

        # Now set the offsets and the closest edge to the tab
        if self.tabIndex == 0:
            # Special case for centred tabs
            self.tabOffset = self.tabOffsetBack = (CardPlot.cardWidth - CardPlot.tabWidth) / 2
            self.closestSide = CardPlot.CENTRE
        elif CardPlot.tabNumber <= 1:
            # If just one tab, then can be right, centre, or left
            self.closestSide = CardPlot.tabStartSide
            if CardPlot.tabStartSide == CardPlot.RIGHT:
                self.tabOffset = CardPlot.cardWidth - CardPlot.tabWidth
                self.tabOffsetBack = 0
            elif CardPlot.tabStartSide == CardPlot.CENTRE:
                self.tabOffset = (CardPlot.cardWidth - CardPlot.tabWidth) / 2
                self.tabOffsetBack = (CardPlot.cardWidth - CardPlot.tabWidth) / 2
            else:
                # LEFT and anything else
                self.tabOffset = 0
                self.tabOffsetBack = CardPlot.cardWidth - CardPlot.tabWidth
        else:
            # More than 1 tabs
            self.tabOffset = (self.tabIndex - 1) * (
                             (CardPlot.cardWidth - CardPlot.tabWidth) / (CardPlot.tabNumber - 1))
            self.tabOffsetBack = CardPlot.cardWidth - CardPlot.tabWidth - self.tabOffset