Use a scatter plot overlay to create real-time chart markers | Deephaven

from deephaven import time_table
from deephaven.plot.figure import Figure
from deephaven.plot import PlotStyle
from deephaven.plot import Color, Colors
from deephaven.plot import font_family_names, Font, FontStyle, Shape


data = time_table('PT00:00:01') 
    .update(["Open = 10*sin(0.2*ii) + 2*random()","High = Open + 1", "Low = Open - 1", "Close = Open + 0.5"])

points = data 
    .where("i%5 = 0") 
    .view(["Timestamp", "Type= i%3==0 ? `Sell` : `Buy`", "Point = i%3==0 ? High+1 : Low-1"])

plot = Figure() 
    .figure_title("OHLC + Points")
    .plot_xy(series_name="OHLC", t=data, x="Timestamp", y_high="High", y_low="Low", y="Close") 
    .twin() 
    .axes(plot_style=PlotStyle.SCATTER) 
    .plot_xy(series_name="Buy", t=points.where("Type=`Buy`"), x="Timestamp", y="Point") 
    .plot_xy(series_name="Sell", t=points.where("Type=`Sell`"), x="Timestamp", y="Point") 
   .show()