New no data

demo/moulinrouge/tests.py

@@ -56,12 +56,6 @@ def get_test_routes(app):
         bar.title = '123456789 ' * 30
         return bar.render_response()
 
-    @app.route('/test/no_data')
-    def test_no_data():
-        bar = Bar()
-        bar.title = '123456789 ' * 30
-        return bar.render_response()
-
     @app.route('/test/none')
     def test_bar_none():
         bar = Bar()
@@ -126,10 +120,24 @@ def get_test_routes(app):
     @app.route('/test/one/<chart>')
     def test_one_for(chart):
         graph = CHARTS_BY_NAME[chart]()
-        graph.add('1', [1, 2])
+        graph.add('1', [10])
         graph.x_labels = 'a',
         return graph.render_response()
 
+    @app.route('/test/no_data/<chart>')
+    def test_no_data_for(chart):
+        graph = CHARTS_BY_NAME[chart]()
+        graph.add('Empty 1', [])
+        graph.add('Empty 2', [])
+        graph.x_labels = 'empty'
+        graph.title = '123456789 ' * 30
+        return graph.render_response()
+
+    @app.route('/test/no_data/at_all/<chart>')
+    def test_no_data_at_all_for(chart):
+        graph = CHARTS_BY_NAME[chart]()
+        return graph.render_response()
+
     @app.route('/test/interpolate/<chart>')
     def test_interpolate_for(chart):
         graph = CHARTS_BY_NAME[chart](interpolate='cubic')

pygal/config.py

@@ -196,6 +196,8 @@ class Config(object):
 
     legend_font_size = Key(14, int, "Text", "Legend font size")
 
+    no_data_font_size = Key(64, int, "Text", "No data text font size")
+
     print_values = Key(
         True, bool,
         "Text", "Print values when graph is in non interactive mode")

pygal/css/base.css

@@ -46,3 +46,8 @@
   font-family: monospace;
   font-size: {{ font_sizes.tooltip }};
 }
+
+text.no_data {
+  font-size: {{ font_sizes.no_data }};
+}
+

pygal/graph/bar.py

@@ -80,6 +80,7 @@ class Bar(Graph):
     def _compute(self):
         self._box.ymin = min(self._min, self.zero)
         self._box.ymax = max(self._max, self.zero)
+
         x_pos = [
             x / self._len for x in range(self._len + 1)
         ] if self._len > 1 else [0, 1]  # Center if only one value

pygal/graph/base.py

@@ -38,7 +38,7 @@ class BaseGraph(object):
     def __init__(self, config, series):
         """Init the graph"""
         self.config = config
-        self.series = series
+        self.series = series or []
         self.horizontal = getattr(self, 'horizontal', False)
         self.svg = Svg(self)
         self._x_labels = None
@@ -52,11 +52,7 @@ class BaseGraph(object):
             self.zero = min(filter(
                 lambda x: x > 0,
                 [val for serie in self.series for val in serie.safe_values]))
-        if self.series and self._has_data():
         self._draw()
-        else:
-            self.svg.draw_no_data()
-
         self.svg.pre_render()
 
     def __getattr__(self, attr):
@@ -66,6 +62,9 @@ class BaseGraph(object):
         return object.__getattribute__(self, attr)
 
     def _split_title(self):
+        if not self.title:
+            self.title = []
+            return
         size = reverse_text_len(self.width, self.title_font_size)
         title = self.title.strip()
         self.title = []
@@ -91,7 +90,7 @@ class BaseGraph(object):
 
     def _compute_margin(self):
         """Compute graph margins from set texts"""
-        if self.show_legend:
+        if self.show_legend and self.series:
             h, w = get_texts_box(
                 map(lambda x: truncate(x, self.truncate_legend or 15),
                     cut(self.series, 'title')),
@@ -141,17 +140,19 @@ class BaseGraph(object):
     @cached_property
     def _len(self):
         """Getter for the maximum series size"""
-        return max([len(serie.values) for serie in self.series])
+        return max([len(serie.values) for serie in self.series] or [0])
 
     @cached_property
     def _min(self):
         """Getter for the minimum series value"""
-        return (self.range and self.range[0]) or min(self._values)
+        return (self.range and self.range[0]) or (
+            min(self._values) if self._values else None)
 
     @cached_property
     def _max(self):
         """Getter for the maximum series value"""
-        return (self.range and self.range[1]) or max(self._values)
+        return (self.range and self.range[1]) or (
+            max(self._values) if self._values else None)
 
     @cached_property
     def _order(self):
@@ -164,11 +165,16 @@ class BaseGraph(object):
         self._split_title()
         self._compute_margin()
         self._decorate()
+        if self.series and self._has_data():
             self._plot()
+        else:
+            self.svg.draw_no_data()
 
     def _has_data(self):
         """Check if there is any data"""
-        return sum(map(len, map(lambda s: s.safe_values, self.series))) != 0
+        return sum(
+            map(len, map(lambda s: s.safe_values, self.series))) != 0 and (
+                sum(map(abs, self._values)) != 0)
 
     def render(self, is_unicode):
         """Render the graph, and return the svg string"""

pygal/graph/gauge.py

@@ -39,15 +39,15 @@ class Gauge(Graph):
 
     def arc_pos(self, value):
         aperture = pi / 3
-        if value > self._max:
+        if value > self.max_:
             return (3 * pi - aperture / 2) / 2
-        if value < self._min:
+        if value < self.min_:
             return (3 * pi + aperture / 2) / 2
         start = 3 * pi / 2 + aperture / 2
         return start + (2 * pi - aperture) * (
             value - self.min_) / (self.max_ - self.min_)
 
-    def needle(self, serie_node, serie,):
+    def needle(self, serie_node, serie):
         thickness = .05
         for i, value in enumerate(serie.values):
             if value is None:
@@ -95,7 +95,8 @@ class Gauge(Graph):
                     else ''))
 
             x, y = self.view((.9, theta))
-            self.svg.node(guides, 'text',
+            self.svg.node(
+                guides, 'text',
                 x=x,
                 y=y
             ).text = label
@@ -109,8 +110,8 @@ class Gauge(Graph):
         self._box.xmin = -1
         self._box.ymin = -1
 
-        self.min_ = self._min
-        self.max_ = self._max
+        self.min_ = self._min or 0
+        self.max_ = self._max or 0
         if self.max_ - self.min_ == 0:
             self.min_ -= 1
             self.max_ += 1

pygal/graph/radar.py

@@ -106,7 +106,7 @@ class Radar(Line):
                 y=y).text = label
 
     def _compute(self):
-        delta = 2 * pi / self._len
+        delta = 2 * pi / self._len if self._len else 0
         x_pos = [.5 * pi + i * delta for i in range(self._len + 1)]
         for serie in self.series:
             serie.points = [
@@ -126,8 +126,9 @@ class Radar(Line):
                     extended_vals, extended_x_pos, polar=True)
 
         self._box.margin *= 2
-        self._box.xmin = self._box.ymin = - self._max
-        self._box.xmax = self._box.ymax = self._rmax = self._max
+        _max = self._max or 1
+        self._box.xmin = self._box.ymin = - _max
+        self._box.xmax = self._box.ymax = self._rmax = _max
 
         y_pos = compute_scale(
             0, self._box.ymax, self.logarithmic, self.order_min, max_scale=8

pygal/graph/stackedbar.py

@@ -46,9 +46,8 @@ class StackedBar(Bar):
         return positive_vals, negative_vals
 
     def _compute_box(self, positive_vals, negative_vals):
-        self._box.ymin, self._box.ymax = (
-            min(min(negative_vals), self.zero),
-            max(max(positive_vals), self.zero))
+        self._box.ymin = negative_vals and min(min(negative_vals), self.zero)
+        self._box.ymax = positive_vals and max(max(positive_vals), self.zero)
 
     def _compute(self):
         positive_vals, negative_vals = self._get_separated_values()

pygal/graph/xy.py

@@ -41,29 +41,33 @@ class XY(Line):
                  for serie in self.series
                  for val in serie.values
                  if val[1] is not None]
+        if xvals:
             xmin = min(xvals)
             xmax = max(xvals)
             rng = (xmax - xmin)
+        else:
+            rng = None
 
         for serie in self.series:
             serie.points = serie.values
-            if self.interpolate:
+            if self.interpolate and rng:
                 vals = zip(*sorted(
                     filter(lambda t: None not in t,
                            serie.points), key=lambda x: x[0]))
                 serie.interpolated = self._interpolate(
                     vals[1], vals[0], xy=True, xy_xmin=xmin, xy_rng=rng)
 
-        if self.interpolate:
+        if self.interpolate and rng:
             xvals = [val[0]
                      for serie in self.series
                      for val in serie.interpolated]
             yvals = [val[1]
                      for serie in self.series
                      for val in serie.interpolated]
-
+        if rng:
             self._box.xmin, self._box.xmax = min(xvals), max(xvals)
             self._box.ymin, self._box.ymax = min(yvals), max(yvals)
+
         x_pos = compute_scale(
             self._box.xmin, self._box.xmax, self.logarithmic, self.order_min)
         y_pos = compute_scale(

pygal/svg.py

@@ -194,9 +194,9 @@ class Svg(object):
             self.root.set('height', str(self.graph.height))
 
     def draw_no_data(self):
-        no_data = self.node(self.root, 'text',
-                            x=self.graph.width / 2,
-                            y=self.graph.height / 2,
+        no_data = self.node(self.graph.nodes['text_overlay'], 'text',
+                            x=self.graph.view.width / 2,
+                            y=self.graph.view.height / 2,
                             class_='no_data')
         no_data.text = self.graph.no_data_text
 

pygal/test/test_config.py

@@ -212,7 +212,7 @@ def test_show_dots():
 def test_no_data():
     line = Line()
     q = line.render_pyquery()
-    assert q("text").text() == "No data"
+    assert q(".text-overlay text").text() == "No data"
     line.no_data_text = u"þæ®þ怀&ij¿’€"
     q = line.render_pyquery()
-    assert q("text").text() == u"þæ®þ怀&ij¿’€"
+    assert q(".text-overlay text").text() == u"þæ®þ怀&ij¿’€"

pygal/test/test_graph.py

@@ -95,7 +95,7 @@ def test_empty_lists(Chart):
     chart.add('B', [])
     chart.x_labels = ('red', 'green', 'blue')
     q = chart.render_pyquery()
-    assert len(q(".legend")) == 1
+    assert len(q(".legend")) == 2
 
 
 def test_empty_lists_with_nones(Chart):
@@ -104,7 +104,7 @@ def test_empty_lists_with_nones(Chart):
     chart.add('B', [None, 4, 4])
     chart.x_labels = ('red', 'green', 'blue')
     q = chart.render_pyquery()
-    assert len(q(".legend")) == 1
+    assert len(q(".legend")) == 2
 
 
 def test_non_iterable_value(Chart):
@@ -160,14 +160,14 @@ def test_values_by_dict(Chart):
 def test_no_data_with_no_values(Chart):
     chart = Chart()
     q = chart.render_pyquery()
-    assert q("text").text() == "No data"
+    assert q(".text-overlay text").text() == "No data"
 
 
 def test_no_data_with_empty_serie(Chart):
     chart = Chart()
     chart.add('Serie', [])
     q = chart.render_pyquery()
-    assert q("text").text() == "No data"
+    assert q(".text-overlay text").text() == "No data"
 
 
 def test_no_data_with_empty_series(Chart):
@@ -175,21 +175,21 @@ def test_no_data_with_empty_series(Chart):
     chart.add('Serie1', [])
     chart.add('Serie2', [])
     q = chart.render_pyquery()
-    assert q("text").text() == "No data"
+    assert q(".text-overlay text").text() == "No data"
 
 
 def test_no_data_with_none(Chart):
     chart = Chart()
     chart.add('Serie', None)
     q = chart.render_pyquery()
-    assert q("text").text() == "No data"
+    assert q(".text-overlay text").text() == "No data"
 
 
 def test_no_data_with_list_of_none(Chart):
     chart = Chart()
     chart.add('Serie', [None])
     q = chart.render_pyquery()
-    assert q("text").text() == "No data"
+    assert q(".text-overlay text").text() == "No data"
 
 
 def test_no_data_with_lists_of_nones(Chart):
@@ -197,4 +197,4 @@ def test_no_data_with_lists_of_nones(Chart):
     chart.add('Serie1', [None, None, None, None])
     chart.add('Serie2', [None, None, None])
     q = chart.render_pyquery()
-    assert q("text").text() == "No data"
+    assert q(".text-overlay text").text() == "No data"

pygal/test/test_line.py

@@ -75,11 +75,9 @@ def test_no_dot():
     line = Line()
     line.add('no dot', [])
     q = line.render_pyquery()
-    assert q(".plot") == []
-    assert q("text").text() == 'No data'
+    assert q(".text-overlay text").text() == 'No data'
 
 
 def test_no_dot_at_all():
     q = Line().render_pyquery()
-    assert q(".plot") == []
-    assert q("text").text() == 'No data'
+    assert q(".text-overlay text").text() == 'No data'

pygal/test/test_util.py

@@ -73,7 +73,8 @@ def test_format():
     obj.a = 1
     obj.b = True
     obj.c = '3'
-    assert template('foo {{ o.a }} {{o.b}}-{{o.c}}',
+    assert template(
+        'foo {{ o.a }} {{o.b}}-{{o.c}}',
         o=obj) == 'foo 1 True-3'
 
 

pygal/util.py

@@ -318,8 +318,6 @@ def prepare_values(raw, config, cls):
         else:
             raw_values = list(raw_values)
 
-        if not filter(lambda x: x is not None, raw_values):
-            continue
         for index, raw_value in enumerate(
                 raw_values + (
                     (width - len(raw_values)) * [None]  # aligning values

pygal/view.py

@@ -48,10 +48,46 @@ class Box(object):
     margin = .02
 
     def __init__(self, xmin=0, ymin=0, xmax=1, ymax=1):
-        self.xmin = xmin
-        self.ymin = ymin
-        self.xmax = xmax
-        self.ymax = ymax
+        self._xmin = xmin
+        self._ymin = ymin
+        self._xmax = xmax
+        self._ymax = ymax
+
+    @property
+    def xmin(self):
+        return self._xmin
+
+    @xmin.setter
+    def xmin(self, value):
+        if value:
+            self._xmin = value
+
+    @property
+    def ymin(self):
+        return self._ymin
+
+    @ymin.setter
+    def ymin(self, value):
+        if value:
+            self._ymin = value
+
+    @property
+    def xmax(self):
+        return self._xmax
+
+    @xmax.setter
+    def xmax(self, value):
+        if value:
+            self._xmax = value
+
+    @property
+    def ymax(self):
+        return self._ymax
+
+    @ymax.setter
+    def ymax(self, value):
+        if value:
+            self._ymax = value
 
     @property
     def width(self):