Changing Markers

[ismailbayram]

Hi there,
Firstly thanks for this great library. My question is: How can I change markers of buy/sell orders? For example I open a buy position and close it. But marker of opening short position and marker of close buy position are same. I would like to label exit short/exit long.

Current Markers:

Desired Markers:

[ismailbayram]

class CurrentPositionObserver(bt.observers.Observer):
    lines = ('long_pos', 'short_pos')

    plotinfo = dict(plot=True, subplot=False,
                    plotname='Positions',
                    plotymargin=0.4, plotlinelabels=True,
                    plothlines=[0.0])

    plotlines = dict(
        long_pos=dict(_name='Long', color='lime'),
        short_pos=dict(_name='Short', color='red')
    )

    def next(self):
        diff = self._owner.broker.getvalue() - self._owner.broker.getcash()
        if diff > 0:
            self.lines.long_pos[0] = self._owner.dataclose[0]
        elif diff < 0:
            self.lines.short_pos[0] = self._owner.dataclose[0]

I think, I can resolve the problem with a custom observer.