Add render_sparkline shorthand function and some config to make it possible

demo/moulinrouge/__init__.py

@@ -16,7 +16,7 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-from flask import Flask, render_template
+from flask import Flask, render_template, Response
 import pygal
 from pygal.config import Config
 from pygal.util import cut
@@ -94,6 +94,13 @@ def create_app():
             graph.add(title, values)
         return graph.render_response()
 
+    @app.route("/sparkline/<style>")
+    def sparkline(style):
+        line = pygal.Line(style=styles[style])
+        line.add('_', [random.randrange(0, 10) for _ in range(25)])
+        return Response(
+            line.render_sparkline(height=40), mimetype='image/svg+xml')
+
     @app.route("/all")
     @app.route("/all/style=<style>")
     @app.route("/all/interpolate=<interpolate>")

demo/moulinrouge/static/css.css

@@ -3,7 +3,18 @@ html, body, section, figure {
   padding: 0;
 }
 
+li {
+  display: block;
+  overflow: auto;
+  font-size: 1.5em;
+}
+
+li a {
+  vertical-align: super;
+}
+
 figure {
+  display: block;
   float: left;
   border: 1px solid #ccc;
 }

demo/moulinrouge/templates/index.jinja2

@@ -1,12 +1,15 @@
 {% extends '_layout.jinja2' %}
 
 {% block section %}
-  <dl>
+  <h1>Moulin Rouge</h1>
-    <dt>All types</dt>
+  <ul>
     {% for style in styles %}
-      <dd><a href="{{ url_for('all', style=style) }}">{{ style }}</a></dd>
+      <li>
+        <embed src="{{ url_for('sparkline', style=style) }}" type="image/svg+xml" />
+        <a href="{{ url_for('all', style=style) }}">{{ style | title }}</a>
+      </li>
     {% endfor %}
-  </dl>
+  </ul>
   <a href="{{ url_for('interpolation') }}">Interpolation</a>
   <a href="{{ url_for('rotation') }}">Rotations test</a>
   <hr />

pygal/config.py

@@ -141,6 +141,14 @@ class Config(object):
     rounded_bars = Key(
         None, int, "Look", "Set this to the desired radius in px")
 
+    spacing = Key(
+        10, int, "Look",
+        "Space between titles/legend/axes")
+
+    margin = Key(
+        20, int, "Look",
+        "Margin around chart")
+
     ############ Label ############
     x_labels = Key(
         None, list, "Label",
@@ -169,6 +177,9 @@ class Config(object):
         "You can specify explicit y labels",
         "Must be a list of numbers", float)
 
+    show_y_labels = Key(
+        True, bool, "Label", "Set to false to hide y-labels")
+
     x_label_rotation = Key(
         0, int, "Label", "Specify x labels rotation angles", "in degrees")
 

pygal/ghost.py

@@ -26,6 +26,7 @@ It is used to delegate rendering to real objects but keeping config in place
 import io
 import sys
 from pygal.config import Config
+from pygal._compat import u
 from pygal.graph import CHARTS_NAMES
 from pygal.util import prepare_values
 
@@ -69,8 +70,9 @@ class Ghost(object):
     def make_series(self, series):
         return prepare_values(series, self.config, self.cls)
 
-    def make_instance(self):
+    def make_instance(self, overrides={}):
         self.config(**self.__dict__)
+        self.config.__dict__.update(overrides)
         series = self.make_series(self.raw_series)
         secondary_series = self.make_series(self.raw_series2)
         self._last__inst = self.cls(self.config, series, secondary_series)
@@ -109,6 +111,34 @@ class Ghost(object):
         return cairosvg.svg2png(
             bytestring=self.render(), write_to=filename, dpi=dpi)
 
+    def render_sparktext(self):
+        """Make a mini text sparkline from chart"""
+        bars = u('▁▂▃▄▅▆▇█')
+        if len(self.raw_series) == 0:
+            return u('')
+        values = list(self.raw_series[0][1])
+        if len(values) == 0:
+            return u('')
+
+        chart = u('')
+        vmax = max(values)
+        divisions = len(bars)
+        for value in values:
+            chart += bars[int(divisions * min(value, 0) / vmax)]
+        return chart
+
+    def render_sparkline(self, width=200, height=50):
+        return self.make_instance(dict(
+            width=width,
+            height=height,
+            show_dots=False,
+            show_legend=False,
+            show_y_labels=False,
+            spacing=0,
+            margin=5,
+            explicit_size=True
+        )).render()
+
     def _repr_png_(self):
         """Display png in IPython notebook"""
         return self.render_to_png()

pygal/graph/base.py

@@ -47,7 +47,7 @@ class BaseGraph(object):
         self._x_2nd_labels = None
         self._y_2nd_labels = None
         self.nodes = {}
-        self.margin = Margin(*([20] * 4))
+        self.margin = Margin(*([self.margin] * 4))
         self._box = Box()
         self.view = None
         if self.logarithmic and self.zero == 0:
@@ -100,15 +100,16 @@ class BaseGraph(object):
                     self.legend_font_size)
                 if self.legend_at_bottom:
                     h_max = max(h, self.legend_box_size)
-                    self.margin.bottom += 10 + h_max * round(
+                    self.margin.bottom += self.spacing + h_max * round(
                         sqrt(self._order) - 1) * 1.5 + h_max
                 else:
                     if series_group is self.series:
-                        legend_width = 10 + w + self.legend_box_size
+                        legend_width = self.spacing + w + self.legend_box_size
                         self.margin.left += legend_width
                         self._legend_at_left_width += legend_width
                     else:
-                        self.margin.right += 10 + w + self.legend_box_size
+                        self.margin.right += (
+                            self.spacing + w + self.legend_box_size)
 
         for xlabels in (self._x_labels, self._x_2nd_labels):
             if xlabels:
@@ -116,7 +117,7 @@ class BaseGraph(object):
                     map(lambda x: truncate(x, self.truncate_label or 25),
                         cut(xlabels)),
                     self.label_font_size)
-                self._x_labels_height = 10 + max(
+                self._x_labels_height = self.spacing + max(
                     w * sin(rad(self.x_label_rotation)), h)
                 if xlabels is self._x_labels:
                     self.margin.bottom += self._x_labels_height
@@ -129,15 +130,16 @@ class BaseGraph(object):
         if not self._x_labels:
             self._x_labels_height = 0
 
+        if self.show_y_labels:
             for ylabels in (self._y_labels, self._y_2nd_labels):
                 if ylabels:
                     h, w = get_texts_box(
                         cut(ylabels), self.label_font_size)
                     if ylabels is self._y_labels:
-                    self.margin.left += 10 + max(
+                        self.margin.left += self.spacing + max(
                             w * cos(rad(self.y_label_rotation)), h)
                     else:
-                    self.margin.right += 10 + max(
+                        self.margin.right += self.spacing + max(
                             w * cos(rad(self.y_label_rotation)), h)
 
         self.title = split_title(
@@ -145,7 +147,7 @@ class BaseGraph(object):
 
         if self.title:
             h, _ = get_text_box(self.title[0], self.title_font_size)
-            self.margin.top += len(self.title) * (10 + h)
+            self.margin.top += len(self.title) * (self.spacing + h)
 
         self.x_title = split_title(
             self.x_title, self.width - self.margin.x, self.title_font_size)
@@ -153,9 +155,9 @@ class BaseGraph(object):
         self._x_title_height = 0
         if self.x_title:
             h, _ = get_text_box(self.x_title[0], self.title_font_size)
-            height = len(self.x_title) * (10 + h)
+            height = len(self.x_title) * (self.spacing + h)
             self.margin.bottom += height
-            self._x_title_height = height + 10
+            self._x_title_height = height + self.spacing
 
         self.y_title = split_title(
             self.y_title, self.height - self.margin.y, self.title_font_size)
@@ -163,9 +165,9 @@ class BaseGraph(object):
         self._y_title_height = 0
         if self.y_title:
             h, _ = get_text_box(self.y_title[0], self.title_font_size)
-            height = len(self.y_title) * (10 + h)
+            height = len(self.y_title) * (self.spacing + h)
             self.margin.left += height
-            self._y_title_height = height + 10
+            self._y_title_height = height + self.spacing
 
     @cached_property
     def _legends(self):
@@ -247,7 +249,7 @@ class BaseGraph(object):
             map(len, map(lambda s: s.safe_values, self.series))) != 0 and (
                 sum(map(abs, self._values)) != 0)
 
-    def render(self, is_unicode):
+    def render(self, is_unicode=False):
         """Render the graph, and return the svg string"""
         return self.svg.render(
             is_unicode=is_unicode, pretty_print=self.pretty_print)

pygal/graph/graph.py

@@ -206,7 +206,7 @@ class Graph(BaseGraph):
 
     def _y_axis(self, draw_axes=True):
         """Make the y axis: labels and guides"""
-        if not self._y_labels:
+        if not self._y_labels or not self.show_y_labels:
             return
 
         axis = self.svg.node(self.nodes['plot'], class_="axis y")
@@ -270,10 +270,10 @@ class Graph(BaseGraph):
             return
         truncation = self.truncate_legend
         if self.legend_at_bottom:
-            x = self.margin.left + 10
+            x = self.margin.left + self.spacing
             y = (self.margin.top + self.view.height +
                  self._x_title_height +
-                 self._x_labels_height + 10)
+                 self._x_labels_height + self.spacing)
             cols = ceil(sqrt(self._order)) or 1
 
             if not truncation:
@@ -282,8 +282,8 @@ class Graph(BaseGraph):
                 truncation = reverse_text_len(
                     available_space, self.legend_font_size)
         else:
-            x = 10
+            x = self.spacing
-            y = self.margin.top + 10
+            y = self.margin.top + self.spacing
             cols = 1
             if not truncation:
                 truncation = 15
@@ -311,13 +311,13 @@ class Graph(BaseGraph):
                 enumerate(zip(self._secondary_legends, repeat(True)))))
 
             # draw secondary axis on right
-            x = self.margin.left + self.view.width + 10
+            x = self.margin.left + self.view.width + self.spacing
             if self._y_2nd_labels:
                 h, w = get_texts_box(
                     cut(self._y_2nd_labels), self.label_font_size)
-                x += 10 + max(w * cos(rad(self.y_label_rotation)), h)
+                x += self.spacing + max(w * cos(rad(self.y_label_rotation)), h)
 
-            y = self.margin.top + 10
+            y = self.margin.top + self.spacing
 
             secondary_legends = self.svg.node(
                 self.nodes['graph'], class_='legends',
@@ -362,7 +362,7 @@ class Graph(BaseGraph):
                 self.svg.node(
                     self.nodes['title'], 'text', class_='title',
                     x=self.width / 2,
-                    y=i * (self.title_font_size + 10)
+                    y=i * (self.title_font_size + self.spacing)
                 ).text = title_line
 
     def _x_title(self):
@@ -374,7 +374,7 @@ class Graph(BaseGraph):
                 text = self.svg.node(
                     self.nodes['title'], 'text', class_='title',
                     x=self.margin.left + self.view.width / 2,
-                    y=y + i * (self.title_font_size + 10)
+                    y=y + i * (self.title_font_size + self.spacing)
                 )
                 text.text = title_line
 
@@ -386,7 +386,7 @@ class Graph(BaseGraph):
                 text = self.svg.node(
                     self.nodes['title'], 'text', class_='title',
                     x=self._legend_at_left_width,
-                    y=i * (self.title_font_size + 10) + yc
+                    y=i * (self.title_font_size + self.spacing) + yc
                 )
                 text.attrib['transform'] = "rotate(%d %f %f)" % (
                     -90, self._legend_at_left_width, yc)

pygal/test/test_sparktext.py

@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+# This file is part of pygal
+#
+# A python svg graph plotting library
+# Copyright © 2012-2013 Kozea
+#
+# This library is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# This library is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with pygal. If not, see <http://www.gnu.org/licenses/>.
+from pygal import Line, Bar
+from pygal._compat import u
+
+
+def test_basic_sparktext():
+    chart = Line()
+    chart.add('_', [1, 5, 22, 13, 53])
+    chart.render_sparktext() == u('▁▁▃▂▇')
+
+
+def test_another_sparktext():
+    chart = Line()
+    chart.add('_', [0, 30, 55, 80, 33, 150])
+    chart.render_sparktext() == u('▁▂▃▅▂▇')
+    chart.render_sparktext() == chart.render_sparktext()
+    chart2 = Bar()
+    chart2.add('_', [0, 30, 55, 80, 33, 150])
+    chart2.render_sparktext() == chart.render_sparktext()
+
+
+def test_negative_and_float_and_no_data_sparktext():
+    chart = Line()
+    chart.add('_', [0.1, 0.2, 0.9, -0.5])
+    chart.render_sparktext() == u('▄▅█▁')
+
+    chart2 = Line()
+    chart2.add('_', [])
+    chart2.render_sparktext() == u('')
+
+    chart3 = Line()
+    chart3.render_sparktext() == u('')