Moving one bar at a time

[rkatikam]

Hi,
I am able to plot the OHLC chart for a stock from a local csv file. It displays the latest 300 candles since i have set it to display like this ax = fplt.create_plot('Example Plot', rows=1, init_zoom_periods=300). I would like to make it more interactive by giving a past date as a reference. For e.g if the past date is 6-June-2023, it should display 300 candles ending at 6-June-2023 and as I press the right arrow button, the entire plot should shift 1 bar to the left and display 300 candles ending on 7-june-2023 (the next trading date for which OHLCV data is available). Now if I press the left arrow, it should display the 300 candles ending again on 6-June-2023. The current code looks like this:

`import finplot as fplt
import pandas as pd
def calc_plot_data(df):
'''Returns data for all plots and for the price line.'''
price = df['open close high low'.split()]
volume = df['open close volume'.split()]
ma50 = ma200 = vema24 = None
ma50 = price.close.rolling(50).mean()
ma200 = price.close.rolling(200).mean()
vema24 = volume.volume.ewm(span=24).mean()
plot_data = dict(price=price, volume=volume, ma50=ma50, ma200=ma200, vema24=vema24)
return plot_data

plots = {}
fplt.y_pad = 0.07 # pad some extra (for control panel)
fplt.max_zoom_points = 7
fplt.autoviewrestore()
ax = fplt.create_plot('Example Plot', rows=1, init_zoom_periods=300)
axo = ax.overlay()
ax.set_visible(xaxis=True)
df=pd.read_csv("TESLA.csv")
df = df.astype({'date':'datetime64[ns]', 'open':float, 'high':float, 'low':float, 'close':float, 'volume':float})
df=df.set_index('date')
data = calc_plot_data(df)
plots['price'] = fplt.candlestick_ochl(data['price'], ax=ax)
plots['volume'] = fplt.volume_ocv(data['volume'], ax=axo)
fplt.show()
`

[highfestiva]

Try this:

from pyqtgraph import QtCore

def my_key_pressed(vb, ev):
    if ev.key() == QtCore.Qt.Key.Key_Left:
        vb.pan_x(steps=-1)
        return True
    elif ev.key() == QtCore.Qt.Key.Key_Right:
        vb.pan_x(steps=+1)
        return True
    return orig_key_pressed(vb, ev)

orig_key_pressed = fplt._key_pressed
fplt._key_pressed = my_key_pressed

[rkatikam]

Wow. Thanks a lot. Worked like a charm. The way I am planning to use is, I have some filters like the below:

1. Close>=max(highs,250)*0.9 // with in 10% of yearly high
2. Close>250 days back close*1.5
3. Close>Ema(close,200)
4. Close>Ema(close,21)
   When all these conditions are satisfied, I would like to plot candlesticks upto that date and then move 1 bar at a time to simulate how the trade worked. It is as close to getting realtime simulation as possible (from the older time). I have few more ideas like to be able to draw a path/ line/ curve (more like tradingview). Not sure how far I will be able to go
   Thanks a lot for this

[highfestiva]

I've used more fuzzy logic for my trading bot, so instead of a boolean "buy or not," I use something like "how close should I put the limit order?" I suspect this is a better approach, as there are never any clear answers in TA. Good luck!