Add secondary range option. Fix #203

CHANGELOG

@@ -8,6 +8,7 @@ V 2.0.0 UNRELEASED
 	Fix no data for graphs with only zeroes (#148)
 	Support value formatter for pie graphs (#218) (thanks never-eat-yellow-snow)
 	Add new Box plot modes and outliers and set extremes as default (#226 #121 #149) (thanks djezar)
+	Add secondary_range option to set range for secondary values. (#203)
 
 V 1.7.0
 	Remove DateY and replace it by real XY datetime, date, time and timedelta support. (#188)

demo/moulinrouge/tests.py

@@ -175,7 +175,7 @@ def get_test_routes(app):
         dot = Dot()
         dot.x_labels = map(str, range(4))
         dot.add('a', [1, lnk(3, 'Foo'), 5, 3])
-        dot.add('b', [2, 2, 0, 2])
+        dot.add('b', [2, 2, 0, 2, .1])
         dot.add('c', [5, 1, 5, lnk(3, 'Bar')])
         dot.add('d', [5, 5, lnk(0, 'Babar'), 3])
 
@@ -582,6 +582,8 @@ def get_test_routes(app):
         chart = Line(title=u'Some different points', interpolate='cubic')
         chart.add('line', [1000, 2000, 7000])
         chart.add('other line', [100, 500, 500], secondary=True)
+        chart.range = 0, 10000
+        chart.secondary_range = 0, 1000
         return chart.render_response()
 
     @app.route('/test/legend_at_bottom/<chart>')

pygal/config.py

@@ -354,6 +354,11 @@ class Config(CommonConfig):
         None, list, "Value", "Explicitly specify min and max of values",
         "(ie: (0, 100))", int)
 
+    secondary_range = Key(
+        None, list, "Value",
+        "Explicitly specify min and max of secondary values",
+        "(ie: (0, 100))", int)
+
     xrange = Key(
         None, list, "Value", "Explicitly specify min and max of x values "
         "(used in XY and Date charts)",

pygal/graph/dot.py

@@ -72,6 +72,7 @@ class Dot(Graph):
     def _plot(self):
         r_max = min(
             self.view.x(1) - self.view.x(0),
-            (self.view.y(0) or 0) - self.view.y(1)) / (2 * (self._max or 1) * 1.05)
+            (self.view.y(0) or 0) - self.view.y(1)) / (
+                2 * (self._max or 1) * 1.05)
         for serie in self.series:
             self.dot(serie, r_max)

pygal/graph/graph.py

@@ -633,7 +633,8 @@ class Graph(BaseGraph):
     @cached_property
     def _secondary_min(self):
         """Getter for the minimum series value"""
-        return (self.range[0] if (self.range and self.range[0] is not None)
+        return (self.secondary_range[0] if (
+            self.secondary_range and self.secondary_range[0] is not None)
                 else (min(self._secondary_values)
                       if self._secondary_values else None))
 
@@ -653,7 +654,8 @@ class Graph(BaseGraph):
     @cached_property
     def _secondary_max(self):
         """Getter for the maximum series value"""
-        return (self.range[1] if (self.range and self.range[1] is not None)
+        return (self.secondary_range[1] if (
+            self.secondary_range and self.secondary_range[1] is not None)
                 else (max(self._secondary_values)
                       if self._secondary_values else None))