Add major y options, this should fix #72 and fix #88 and fix #93

CHANGELOG

@@ -0,0 +1,11 @@
+TO BE RELEASED: V 1.4.0
+	Finally a changelog !
+	Hopefully fix weird major scale algorithm
+	Add options to customize major labels (y_labels_major, y_labels_major_every, y_labels_major_count)
+	Css can now be inline with the "inline:" prefix
+	Visited links bug fixed
+
+V 1.3.x
+	Whisker Box Plot
+	Python 3 fix
+	DateY X axis formatting (x_label_format)

pygal/config.py

@@ -204,9 +204,21 @@ class Config(object):
         "You can specify explicit y labels",
         "Must be a list of numbers", float)
 
-    y_labels_use_major = Key(
+    y_labels_major = Key(
-        True, bool, "Label",
+        None, list, "Label",
-        "Whether to promote some labels majors.")
+        "Y labels that will be marked major. Default: auto",
+        subtype=str)
+
+    y_labels_major_every = Key(
+        None, int, "Label",
+        "Mark every n-th y label as major.")
+
+    y_labels_major_count = Key(
+        None, int, "Label",
+        "Mark n evenly distributed y labels as major.")
+
+    show_minor_y_labels = Key(
+        True, bool, "Label", "Set to false to hide y-labels not marked major")
 
     show_y_labels = Key(
         True, bool, "Label", "Set to false to hide y-labels")

pygal/graph/graph.py

@@ -158,6 +158,7 @@ class Graph(BaseGraph):
                     for i in range(major_count)]
         else:
             x_labels_major = []
+
         for label, position in self._x_labels:
             major = label in x_labels_major
             if not (self.show_minor_x_labels or major):
@@ -228,11 +229,29 @@ class Graph(BaseGraph):
                 d='M%f %f h%f' % (0, self.view.height, self.view.width),
                 class_='line'
             )
-        majors = majorize(
+
+        if self.y_labels_major:
+            y_labels_major = self.y_labels_major
+        elif self.y_labels_major_every:
+            y_labels_major = [self._y_labels[i][1] for i in range(
+                0, len(self._y_labels), self.y_labels_major_every)]
+        elif self.y_labels_major_count:
+            label_count = len(self._y_labels)
+            major_count = self.y_labels_major_count
+            if (major_count >= label_count):
+                y_labels_major = [label[1] for label in self._y_labels]
+            else:
+                y_labels_major = [self._y_labels[
+                    int(i * (label_count - 1) / (major_count - 1))][1]
+                    for i in range(major_count)]
+        else:
+            y_labels_major = majorize(
                 cut(self._y_labels, 1)
-        ) if self.y_labels_use_major else []
+            )
         for label, position in self._y_labels:
-            major = position in majors
+            major = position in y_labels_major
+            if not (self.show_minor_y_labels or major):
+                continue
             guides = self.svg.node(axis, class_='%sguides' % (
                 'logarithmic ' if self.logarithmic else ''
             ))
@@ -265,11 +284,10 @@ class Graph(BaseGraph):
         if self._y_2nd_labels:
             secondary_ax = self.svg.node(
                 self.nodes['plot'], class_="axis y2")
-            majors = majorize(
-                cut(self._y_2nd_labels, 1)
-            ) if self.y_labels_use_major else []
             for label, position in self._y_2nd_labels:
-                major = position in majors
+                major = position in y_labels_major
+                if not (self.show_minor_x_labels or major):
+                    continue
                 # it is needed, to have the same structure as primary axis
                 guides = self.svg.node(secondary_ax, class_='guides')
                 x = self.view.width + 5

pygal/graph/radar.py

@@ -75,7 +75,7 @@ class Radar(Line):
         if self.x_labels_major:
             x_labels_major = self.x_labels_major
         elif self.x_labels_major_every:
-            x_labels_major = [self._x_labels[i][0] for i in xrange(
+            x_labels_major = [self._x_labels[i][0] for i in range(
                 0, len(self._x_labels), self.x_labels_major_every)]
         elif self.x_labels_major_count:
             label_count = len(self._x_labels)
@@ -85,7 +85,7 @@ class Radar(Line):
             else:
                 x_labels_major = [self._x_labels[
                     int(i * label_count / major_count)][0]
-                    for i in xrange(major_count)]
+                    for i in range(major_count)]
         else:
             x_labels_major = []
 
@@ -118,12 +118,29 @@ class Radar(Line):
             return
 
         axis = self.svg.node(self.nodes['plot'], class_="axis y web")
-        majors = majorize(
-            cut(self._y_labels, 1)
-        ) if self.y_labels_use_major else []
 
+        if self.y_labels_major:
+            y_labels_major = self.y_labels_major
+        elif self.y_labels_major_every:
+            y_labels_major = [self._y_labels[i][1] for i in range(
+                0, len(self._y_labels), self.y_labels_major_every)]
+        elif self.y_labels_major_count:
+            label_count = len(self._y_labels)
+            major_count = self.y_labels_major_count
+            if (major_count >= label_count):
+                y_labels_major = [label[1] for label in self._y_labels]
+            else:
+                y_labels_major = [self._y_labels[
+                    int(i * (label_count - 1) / (major_count - 1))][1]
+                    for i in range(major_count)]
+        else:
+            y_labels_major = majorize(
+                cut(self._y_labels, 1)
+            )
         for label, r in reversed(self._y_labels):
-            major = r in majors
+            major = r in y_labels_major
+            if not (self.show_minor_y_labels or major):
+                continue
             guides = self.svg.node(axis, class_='guides')
             self.svg.line(
                 guides, [self.view((r, theta)) for theta in self.x_pos],

pygal/test/test_util.py

@@ -167,3 +167,7 @@ def test_major():
     assert majorize((-6, -5, -4, -3, -2, -1, 0, 1, 2, 3)) == [-5, 0]
     assert majorize((-6, -5, -4, -3)) == [-5]
     assert majorize((1, 10, 100, 1000, 10000, 100000)) == []
+    assert majorize(range(30, 70, 5)) == [30, 40, 50, 60]
+    assert majorize(range(20, 55, 2)) == [20, 30, 40, 50]
+    assert majorize(range(21, 83, 3)) == [30, 45, 60, 75]
+    assert majorize(range(20, 83, 3)) == [20, 35, 50, 65, 80]