From 986860cab66f577e2a4246e9aabb3137df5a8e69 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Plasse?= <clement.plasse@kozea.fr>
Date: Wed, 2 Apr 2014 15:48:11 +0200
Subject: [PATCH] Add new config option for hiding all dots except major
 labeled ones

---
 pygal/config.py     |  4 ++++
 pygal/graph/line.py | 24 ++++++++++++++++++++++--
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/pygal/config.py b/pygal/config.py
index b19472e..08f23c9 100644
--- a/pygal/config.py
+++ b/pygal/config.py
@@ -140,6 +140,10 @@ class Config(MetaConfig('ConfigBase', (object,), {})):
 
     show_dots = Key(True, bool, "Look", "Set to false to remove dots")
 
+    show_only_major_dots = Key(
+        False, bool, "Look",
+        "Set to true to show only major dots according to their majored label")
+
     dots_size = Key(2.5, float, "Look", "Radius of the dots")
 
     stroke = Key(
diff --git a/pygal/graph/line.py b/pygal/graph/line.py
index b24c746..bf34ef6 100644
--- a/pygal/graph/line.py
+++ b/pygal/graph/line.py
@@ -67,10 +67,30 @@ class Line(Graph):
             points = serie.points
         view_values = list(map(self.view, points))
         if self.show_dots:
+            if self.show_only_major_dots:
+                major_dots_index = []
+                if self.x_labels:
+                    if self.x_labels_major:
+                        major_dots_index = []
+                        for major in self.x_labels_major:
+                            start = -1
+                            while True:
+                                try:
+                                    index = self.x_labels.index(
+                                        major, start + 1)
+                                except ValueError:
+                                    break
+                                else:
+                                    major_dots_index.append(index)
+                                    start = index
+                    elif self.x_labels_major_every:
+                        major_dots_index = range(
+                            0, len(self.x_labels), self.x_labels_major_every)
+
             for i, (x, y) in enumerate(view_values):
-                if None in (x, y):
+                if None in (x, y) or (self.show_only_major_dots
+                                      and i not in major_dots_index):
                     continue
-
                 metadata = serie.metadata.get(i)
                 classes = []
                 if x > self.view.width / 2: