Add ability to plot bars on indicator chart and pass custom arguments to plotly.

freqtrade/plot/plotting.py

@@ -96,20 +96,34 @@ def add_indicators(fig, row, indicators: Dict[str, Dict], data: pd.DataFrame) ->
                        Dict key must correspond to dataframe column.
     :param data: candlestick DataFrame
     """
+    plot_kinds = {
+        'scatter': go.Scatter,
+        'bar': go.Bar,
+    }
     for indicator, conf in indicators.items():
         logger.debug(f"indicator {indicator} with config {conf}")
         if indicator in data:
             kwargs = {'x': data['date'],
                       'y': data[indicator].values,
-                      'mode': 'lines',
                       'name': indicator
                       }
-            if 'color' in conf:
-                kwargs.update({'line': {'color': conf['color']}})
-            scatter = go.Scatter(
-                **kwargs
-            )
-            fig.add_trace(scatter, row, 1)
+
+            plot_type = conf.get('type', 'scatter')
+            color = conf.get('color')
+            if plot_type == 'bar':
+                kwargs.update({'marker_color': color or 'DarkSlateGrey',
+                               'marker_line_color': color or 'DarkSlateGrey'})
+            else:
+                if color:
+                    kwargs.update({'line': {'color': color}})
+                kwargs['mode'] = 'lines'
+                if plot_type != 'scatter':
+                    logger.warning(f'Indicator {indicator} has hnknown plot trace kind {plot_type}'
+                                   f', assuming "scatter".')
+
+            kwargs.update(conf.get('plotly', {}))
+            trace = plot_kinds[plot_type](**kwargs)
+            fig.add_trace(trace, row, 1)
         else:
             logger.info(
                 'Indicator "%s" ignored. Reason: This indicator is not found '