LinesCoupler is plotted on different figure when passing line instead of data to SMA indicator

paul_lam

I am currently trying to implement a strategy which uses a larger timeframe indicators. I started to learn from the "Mixing Timeframes in Indicators" article and have the following amended code to achieve the goal. In particular, I would like to have resample data using 7-day instead of month timeframe, and have a SMA indicator.

import argparse

import backtrader as bt
import backtrader.feeds as btfeeds
import backtrader.indicators as btind
import backtrader.utils.flushfile


class St(bt.Strategy):
    params = dict(multi=True)

    def __init__(self):
        self.sma = sma = btind.SMA(self.data1)
        sma.plotinfo.plot = True  # show plotting

        if self.p.multi:
            sma1 = sma()  # couple the entire indicators
            self.sellsignal = self.data0.close < sma1.sma
        else:
            self.sellsignal = self.data0.close < sma.sma()

    def next(self):
        txt = ','.join(
            ['%04d' % len(self),
             '%04d' % len(self.data0),
             '%04d' % len(self.data1),
             self.data.datetime.date(0).isoformat(),
             '%.2f' % self.data0.close[0],
             '%.2f' % self.sma.sma[0],
             '%.2f' % self.sellsignal[0]])

        print(txt)


def runstrat():
    args = parse_args()

    cerebro = bt.Cerebro()
    data = btfeeds.BacktraderCSVData(dataname=args.data)
    cerebro.adddata(data)
    cerebro.resampledata(data, timeframe=bt.TimeFrame.Days, compression=7)

    cerebro.addstrategy(St, multi=args.multi)

    cerebro.run(stdstats=False, runonce=False)
    if args.plot:
        cerebro.plot(style='bar')


def parse_args():
    parser = argparse.ArgumentParser(
        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
        description='Sample for pivot point and cross plotting')

    parser.add_argument('--data', required=False,
                        default='../../datas/2005-2006-day-001.txt',
                        help='Data to be read in')

    parser.add_argument('--multi', required=False, action='store_true',
                        help='Couple all lines of the indicator')

    parser.add_argument('--plot', required=False, action='store_true',
                        help=('Plot the result'))

    return parser.parse_args()


if __name__ == '__main__':
    runstrat()

The following figure shows the result of plot and everything is working as excepted after amendments.

Since I would like to have a SMA of different prices such as open and high, I found this useful post, and I further changed
self.sma = sma = btind.SMA(self.data1)
into
self.sma = sma = btind.SMA(self.data1.open)

In that case, the LinesCoupler is plotted on 7-Day figure as shown below.

Although I believe that this may not affect my mogic and calculation, as I am able to verify values of lines from the print(txt), I would like to know if there is way to put LinesCoupler back to the first plot in order to better presentation.