From 60fb41b1d5ab55da4a75af9608d9f43cefe14611 Mon Sep 17 00:00:00 2001
From: Florian Mounier <florian.mounier@kozea.fr>
Date: Fri, 21 Nov 2014 10:23:17 +0100
Subject: [PATCH] Add legend_at_bottom_columns option to specify number of
 columns in legend when at bottom. Fixes #157

---
 demo/moulinrouge/tests.py | 5 +++--
 pygal/config.py           | 3 +++
 pygal/graph/base.py       | 7 +++++--
 pygal/graph/graph.py      | 3 ++-
 4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/demo/moulinrouge/tests.py b/demo/moulinrouge/tests.py
index 56a52eb..87cdb50 100644
--- a/demo/moulinrouge/tests.py
+++ b/demo/moulinrouge/tests.py
@@ -511,9 +511,10 @@ def get_test_routes(app):
     @app.route('/test/half_pie')
     def test_half_pie():
         pie = Pie(half_pie=True)
-        for i in range(10):
+        for i in range(100):
             pie.add(str(i), i, inner_radius=.1)
-
+        pie.legend_at_bottom = True
+        pie.legend_at_bottom_columns = 4
         return pie.render_response()
 
     @app.route('/test/legend_at_bottom/<chart>')
diff --git a/pygal/config.py b/pygal/config.py
index 6b5cbf3..2de0aa4 100644
--- a/pygal/config.py
+++ b/pygal/config.py
@@ -221,6 +221,9 @@ class Config(CommonConfig):
     legend_at_bottom = Key(
         False, bool, "Look", "Set to true to position legend at bottom")
 
+    legend_at_bottom_columns = Key(
+        None, int, "Look", "Set to true to position legend at bottom")
+
     legend_box_size = Key(
         12, int, "Look", "Size of legend boxes")
 
diff --git a/pygal/graph/base.py b/pygal/graph/base.py
index 12659ef..ff5ac22 100644
--- a/pygal/graph/base.py
+++ b/pygal/graph/base.py
@@ -27,7 +27,7 @@ from pygal.util import (
     get_text_box, get_texts_box, cut, rad, humanize, truncate, split_title)
 from pygal.svg import Svg
 from pygal.util import cached_property, majorize
-from math import sin, cos, sqrt
+from math import sin, cos, sqrt, ceil
 
 
 class BaseGraph(object):
@@ -93,8 +93,11 @@ class BaseGraph(object):
                     self.legend_font_size)
                 if self.legend_at_bottom:
                     h_max = max(h, self.legend_box_size)
+                    cols = (self._order // self.legend_at_bottom_columns
+                            if self.legend_at_bottom_columns
+                            else ceil(sqrt(self._order)) or 1)
                     self.margin.bottom += self.spacing + h_max * round(
-                        sqrt(self._order) - 1) * 1.5 + h_max
+                        cols - 1) * 1.5 + h_max
                 else:
                     if series_group is self.series:
                         legend_width = self.spacing + w + self.legend_box_size
diff --git a/pygal/graph/graph.py b/pygal/graph/graph.py
index fca3101..3578610 100644
--- a/pygal/graph/graph.py
+++ b/pygal/graph/graph.py
@@ -279,7 +279,8 @@ class Graph(BaseGraph):
             y = (self.margin.top + self.view.height +
                  self._x_title_height +
                  self._x_labels_height + self.spacing)
-            cols = ceil(sqrt(self._order)) or 1
+            cols = self.legend_at_bottom_columns or ceil(
+                sqrt(self._order)) or 1
 
             if not truncation:
                 available_space = self.view.width / cols - (