feat: a plot

main.py

@@ -1,9 +1,14 @@
+import pandas as pd  # type: ignore
+
 from auto_trading.broker.backtest import Backtest
 from auto_trading.strat.hold import Hold
 from auto_trading.ptf.in_memory import InMemoryPortfolio
 from auto_trading.bot import Bot
 
 
+pd.options.plotting.backend = "plotly"
+
+
 if __name__ == "__main__":
     bt = Backtest("./data/NYSE_smallest.csv")
     ptf = InMemoryPortfolio(
@@ -19,3 +24,10 @@ if __name__ == "__main__":
         print(order)
 
     print(bot.ptf.total_balance(bot.broker.current_change))
+
+    ch_history: pd.DataFrame = bot.broker.change_rate_history  # type: ignore
+    st_history = pd.DataFrame(
+        [s.stocks for s in bot.ptf.states_history],
+        index=ch_history.index,
+    )
+    (st_history * ch_history).fillna(0).plot.area().show()