macd展示period；柱子的值保留两位小数

chart.py

@@ -91,7 +91,8 @@ def add_macd(
     )
     df["DIF"] = macd
     df["DEA"] = signal
-    df["MACD"] = hist * 2
+    macd_name = f"MACD_{fastperiod}_{slowperiod}_{signalperiod}"
+    df[macd_name] = np.round(hist * 2, 2)
     macd_chart = chart.create_subchart(
         position=position, width=1, height=height, sync=True
     )
@@ -100,9 +101,9 @@ def add_macd(
     )
     macd_chart.time_scale(visible=False)
 
-    histogram = macd_chart.create_histogram(name="MACD")
-    hist_data = df[["time", "MACD"]].copy()
-    hist_data["color"] = hist_data["MACD"].apply(
+    histogram = macd_chart.create_histogram(name=macd_name)
+    hist_data = df[["time", macd_name]].copy()
+    hist_data["color"] = hist_data[macd_name].apply(
         lambda x: "#00FF00" if x < 0 else "#ff0000"  # 绿色 : 红色
     )
     histogram.set(hist_data)