Add support for multiple traces (e.g., charts where multiple lines are plotted)

candlestick_chart.py

@@ -1,6 +1,7 @@
 from chart import Chart
 from pandas import Series
 from plotly.graph_objects import Candlestick
+from typing import List
 
 class CandlestickChart(Chart):
 
@@ -11,8 +12,8 @@ class CandlestickChart(Chart):
         self.lows = lows
         self.closes = closes
 
-    def trace(self) -> Candlestick:
-        return Candlestick(
+    def traces(self) -> List[Candlestick]:
+        return [Candlestick(
             x = self.x, 
             open = self.opens, 
             high = self.highs, 
@@ -20,4 +21,4 @@ class CandlestickChart(Chart):
             close = self.closes, # TODO: Make colors configurable.
             increasing = dict(line = dict(color = 'limegreen', width = 1), fillcolor = 'limegreen'),
             decreasing = dict(line = dict(color = 'red', width = 1), fillcolor = 'red')
-        )
+        )]

chart.py

@@ -1,6 +1,7 @@
 from plotly.basedatatypes import BaseTraceType
+from typing import List
 
 class Chart:
 
-    def trace(self) -> BaseTraceType:
+    def traces(self) -> List[BaseTraceType]:
         pass

line_chart.py

@@ -1,19 +1,21 @@
 from chart import Chart
 from pandas import Series
 from plotly.graph_objects import Scatter
+from typing import List
 
 class LineChart(Chart):
 
-    def __init__(self, x: Series, y: Series, name: str):
+    def __init__(self, x: Series, values: List[Series]):
         self.x = x
-        self.y = y
-        self.name = name
+        self.values = values
 
-    def trace(self) -> Scatter:
-        return Scatter(
+    def traces(self) -> List[Scatter]:
+        traces = []
+        for value in self.values:
+            traces.append(Scatter(
                 x = self.x,
-            y = self.y,
-            name = self.name,
+                y = value,
                 mode = 'lines',
                 line=dict(color = 'yellow') # TODO: Make this configurable.
-        )
+            ))
+        return traces

line_chart_example.py

@@ -10,7 +10,6 @@ data = ohlc('SPX.XO', '1d', start_date = start_date, end_date = end_date)
 
 line_chart = LineChart(
     x = data['Timestamp'], 
-    y = data['Close'],
-    name = 'SPX'
+    values = [data['Close']]
 )
 plot(line_chart)

plot.py

@@ -11,7 +11,8 @@ def figure_with_subplots(subplots: List[List[Chart]]) -> Figure:
 
     for i, row in enumerate(subplots, start = 1):
         for j, chart in enumerate(row, start = 1):
-            figure.add_trace(chart.trace(), row = i, col = j)
+            for trace in chart.traces():
+                figure.add_trace(trace, row = i, col = j)
             figure.update_xaxes(showgrid = False, showticklabels = True, rangeslider = dict(visible = False), row = i, col = j)
             figure.update_yaxes(showgrid = False, side = 'right', row = i, col = j)