Add horizontal graphs

demo/moulinrouge/__init__.py

@@ -70,7 +70,8 @@ def create_app():
         width, height = 600, 400
         svgs = [url_for('all_svg', type=type, style=style)
                 for style in styles
-                for type in ('Bar', 'Line', 'XY', 'Pie', 'StackedBar')]
+                for type in ('Bar', 'Line', 'XY', 'Pie', 'StackedBar',
+                          'HorizontalBar', 'HorizontalStackedBar')]
         return render_template('svgs.jinja2',
                                svgs=svgs,
                                width=width,

out.py

@@ -1,5 +1,7 @@
 #!/usr/bin/env python
-from pygal import Line, Bar, XY, Pie, StackedBar, Config
+from pygal import (
+    Line, Bar, XY, Pie, StackedBar, Config,
+    HorizontalBar, HorizontalStackedBar)
 from pygal.style import NeonStyle
 from math import cos, sin
 
@@ -12,6 +14,17 @@ bar.title = "Bar test"
 with open('out-bar.svg', 'w') as f:
     f.write(bar.render())
 
+hbar = HorizontalBar()
+rng = [18, 9, 7, 3, 1, 0, -5]
+hbar.add('test1', rng)
+rng2 = [16, 14, 10, 9, 7, 3, -1]
+hbar.add('test2', rng2)
+hbar.x_labels = map(
+    lambda x: '%s / %s' % x, zip(map(str, rng), map(str, rng2)))
+hbar.title = "Horizontal Bar test"
+with open('out-horizontalbar.svg', 'w') as f:
+    f.write(hbar.render())
+
 
 rng = [3, -32, 39, 12]
 rng2 = [24, -8, 18, 12]
@@ -22,8 +35,9 @@ config.x_labels = map(lambda x: '%s  / %s / %s' % x,
                         zip(map(str, rng),
                             map(str, rng2),
                             map(str, rng3)))
-config.title = "Config test"
+config.title = "Stacked Bar test"
 config.style = NeonStyle
+config.horizontal = True
 
 stackedbar = StackedBar(config)
 stackedbar.add('@@@@@@@', rng)
@@ -32,6 +46,14 @@ stackedbar.add('--->', rng3)
 with open('out-stackedbar.svg', 'w') as f:
     f.write(stackedbar.render())
 
+config.title = "Horizontal Stacked Bar test"
+hstackedbar = HorizontalStackedBar(config)
+hstackedbar.add('@@@@@@@', rng)
+hstackedbar.add('++++++', rng2)
+hstackedbar.add('--->', rng3)
+with open('out-horizontalstackedbar.svg', 'w') as f:
+    f.write(hstackedbar.render())
+
 line = Line(Config(y_scale=.0005))
 rng = range(-30, 31, 5)
 line.add('test1', [cos(x / 10.) for x in rng])

pygal/__init__.py

@@ -1,7 +1,9 @@
 from collections import namedtuple
 
 from pygal.graph.bar import Bar
+from pygal.graph.horizontal import HorizontalBar
 from pygal.graph.stackedbar import StackedBar
+from pygal.graph.horizontal import HorizontalStackedBar
 from pygal.graph.line import Line
 from pygal.graph.xy import XY
 from pygal.graph.pie import Pie

pygal/css/graph.css

@@ -71,7 +71,7 @@ svg * {
   stroke-dasharray: 5,5;
 }
 
-.axis.x .guide.line {
+.axis.{{ hidden }} .guide.line {
   opacity: 0;
 }
 

pygal/graph/base.py

@@ -3,13 +3,14 @@ from pygal.view import Margin, Box
 from pygal.util import round_to_scale, cut, rad
 from pygal.svg import Svg
 from pygal.config import Config
-from math import log10, sin, cos, pi
+from math import log10, sin, cos
 
 
 class BaseGraph(object):
     """Graphs commons"""
 
-    def __init__(self, config=None):
+    def __init__(self, config=None, horizontal=False):
+        self.horizontal = horizontal
         self.config = config or Config()
         self.svg = Svg(self)
         self.series = []

pygal/graph/horizontal.py

@@ -0,0 +1,25 @@
+from pygal.graph.bar import Bar
+from pygal.graph.stackedbar import StackedBar
+
+
+class HorizontalGraph(object):
+    """Horizontal graph"""
+    def __init__(self, *args, **kwargs):
+        kwargs['horizontal'] = True
+        super(HorizontalGraph, self).__init__(*args, **kwargs)
+
+    def _compute(self):
+        super(HorizontalGraph, self)._compute()
+        self._x_labels, self._y_labels = self._y_labels, self._x_labels
+        self._box.swap()
+        # Y axis is inverted
+        for serie in self.series:
+            serie.values = reversed(serie.values)
+
+
+class HorizontalBar(HorizontalGraph, Bar):
+    """Horizontal Bar graph"""
+
+
+class HorizontalStackedBar(HorizontalGraph, StackedBar):
+    """Horizontal Stacked Bar graph"""

pygal/svg.py

@@ -1,7 +1,7 @@
 import os
 from lxml import etree
 from pygal.view import View
-from pygal.util import template
+from pygal.util import template, swap, ident
 from math import cos, sin, pi
 
 
@@ -31,7 +31,8 @@ class Svg(object):
             style.text = template(
                 f.read(),
                 style=self.graph.style,
-                font_sizes=self.graph.font_sizes)
+                font_sizes=self.graph.font_sizes,
+                hidden='y' if self.graph.horizontal else 'x')
 
     def node(self, parent=None, tag='g', attrib=None, **extras):
         if parent is None:
@@ -180,16 +181,23 @@ class Svg(object):
 
         def view(rng):
             """Project range"""
-            return (self.view(rng[0]), self.view(rng[1]))
+            t, T = rng
+            fun = swap if self.graph.horizontal else ident
+            return (self.view(fun(t)), self.view(fun(T)))
 
         bars = self.node(serie_node, class_="bars")
         view_values = map(view, values)
         for i, ((x, y), (X, Y)) in enumerate(view_values):
             # x and y are left range coords and X, Y right ones
+            if self.graph.horizontal:
+                x, y, X, Y = Y, X, y, x
             width = X - x
             padding = .1 * width
             inner_width = width - 2 * padding
-            height = self.view.y(0) - y
+            if self.graph.horizontal:
+                height = self.view.x(0) - y
+            else:
+                height = self.view.y(0) - y
             if stack_vals == None:
                 bar_width = inner_width / len(self.graph.series)
                 bar_padding = .1 * bar_width
@@ -209,17 +217,31 @@ class Svg(object):
 
             y_txt = y + height / 2 + .3 * self.graph.values_font_size
             bar = self.node(bars, class_='bar')
-            self.node(bar, 'rect',
-                      x=x,
-                      y=y - shift,
-                      rx=self.graph.rounded_bars * 1,
-                      ry=self.graph.rounded_bars * 1,
-                      width=bar_inner_width,
-                      height=height,
-                      class_='rect')
-            self.node(bar, 'text',
-                      x=x + bar_inner_width / 2,
-                      y=y_txt - shift,
+            if self.graph.horizontal:
+                self.node(bar, 'rect',
+                          x=y - shift,
+                          y=x,
+                          rx=self.graph.rounded_bars * 1,
+                          ry=self.graph.rounded_bars * 1,
+                          width=height,
+                          height=bar_inner_width,
+                          class_='rect')
+                self.node(bar, 'text',
+                          x=y_txt - shift,
+                          y=x + bar_inner_width / 2,
+                      ).text = str(values[i][1][1])
+            else:
+                self.node(bar, 'rect',
+                          x=x,
+                          y=y - shift,
+                          rx=self.graph.rounded_bars * 1,
+                          ry=self.graph.rounded_bars * 1,
+                          width=bar_inner_width,
+                          height=height,
+                          class_='rect')
+                self.node(bar, 'text',
+                          x=x + bar_inner_width / 2,
+                          y=y_txt - shift,
                       ).text = str(values[i][1][1])
         return stack_vals
 

pygal/util.py

@@ -48,3 +48,6 @@ def _swap_curly(string):
 def template(string, **kwargs):
     """Format a string using double braces"""
     return _swap_curly(string).format(**kwargs)
+
+swap = lambda tuple_: tuple(reversed(tuple_))
+ident = lambda x: x

pygal/view.py

@@ -27,6 +27,10 @@ class Box(object):
     def height(self):
         return self.ymax - self.ymin
 
+    def swap(self):
+        self.xmin, self.ymin = self.ymin, self.xmin
+        self.xmax, self.ymax = self.ymax, self.xmax
+
     def fix(self):
         if not self.width:
             self.xmax = self.xmin + 1