Better range calc

pygal/css/graph.css

@@ -1,3 +1,9 @@
+svg * {
+  -webkit-transition: 250ms;
+  -moz-transition: 250ms;
+  transition: 250ms;
+}
+
 .graph > .background {
   fill: black;
 }
@@ -7,7 +13,7 @@
 }
 
 .graph {
-  fill: #777;
+  fill: #999;
 }
 
 .title {
@@ -51,14 +57,16 @@
 }
 
 .axis.x .guide.line {
-  stroke: none;
+  opacity: 0;
 }
 
 .axis .guides:hover .guide.line {
   stroke: #aaa;
+  opacity: 1;
 }
 
 .axis .guides:hover text {
+  opacity: 1;
   fill: #aaa;
 }
 
@@ -68,15 +76,16 @@
 }
 
 .series .dots .dot text {
+  opacity: 0;
   font-size: 10px;
   text-anchor: middle;
   alignment-baseline: baseline;
   stroke: none;
-  fill: none;
+  fill: #ccc;
 }
 
 .series .dots .dot:hover text {
-  fill: #ccc;
+  opacity: 1;
 }
 
 .series .line {

pygal/line.py

@@ -6,11 +6,12 @@ from pygal.base import BaseGraph
 class Line(BaseGraph):
     """Line graph"""
 
-    def __init__(self, width, height):
+    def __init__(self, width, height, scale_int=False):
         self.width = width
         self.height = height
         self.svg = Svg(width, height)
         self.label_font_size = 12
+        self.scale_int = scale_int
         self.series = []
         self.x_labels = self.title = None
 
@@ -18,17 +19,13 @@ class Line(BaseGraph):
         self.series.append(
             Serie(title, values))
 
-    def set_labels(self, labels):
-        values = float(len(labels) - 1)
-        self.x_labels = [Label(label, i / values)
-                         for i, label in enumerate(labels)]
-
     def y_labels(self, ymin, ymax):
         step = (ymax - ymin) / 20.
         label = ymin
         labels = []
         while label < ymax:
-            labels.append(Label(str(label), label))
+            lbl = int(label) if self.scale_int else label
+            labels.append(Label(str(lbl), lbl))
             label += step
         return labels
 
@@ -41,15 +38,19 @@ class Line(BaseGraph):
 
     def draw(self):
         self.validate()
-
+        x_step = len(self.series[0].values)
+        x_pos = [x / float(x_step - 1) for x in range(x_step)]
         vals = [val for serie in self.series for val in serie.values]
         margin = Margin(*(4 * [10]))
         ymin, ymax = min(vals), max(vals)
-        x_labels = self.x_labels
+        if self.x_labels:
+            x_labels = [Label(label, x_pos[i])
+                         for i, label in enumerate(self.x_labels)]
         y_labels = self.y_labels(ymin, ymax)
         series_labels = [serie.title for serie in self.series]
         margin.left += 10 + max(
             map(len, [l.label for l in y_labels])) * 0.6 * self.label_font_size
+        if self.x_labels:
             margin.bottom += 10 + self.label_font_size
         margin.right += 20 + max(
             map(len, series_labels)) * 0.6 * self.label_font_size
@@ -58,6 +59,7 @@ class Line(BaseGraph):
         # Actual drawing
         self.svg.set_view(margin, ymin, ymax)
         self.svg.graph(margin)
+        if self.x_labels:
             self.svg.x_axis(x_labels)
         self.svg.y_axis(y_labels)
         self.svg.legend(margin, series_labels)
@@ -65,5 +67,5 @@ class Line(BaseGraph):
         for serie_index, serie in enumerate(self.series):
             serie_node = self.svg.serie(serie_index)
             self.svg.line(serie_node, [
-                (x_labels[i].pos, v)
+                (x_pos[i], v)
                 for i, v in enumerate(serie.values)])

pygal/test/test_line.py

@@ -7,6 +7,6 @@ def test_simple_line():
     line.add('test1', [cos(x / 10.) for x in range(-30, 30, 5)])
     line.add('test2', [sin(x / 10.) for x in range(-30, 30, 5)])
     line.add('test3', [cos(x / 10.) - sin(x / 10.) for x in range(-30, 30, 5)])
-    line.set_labels(map(str, range(-30, 30, 5)))
+    line.x_labels = map(str, range(-30, 30, 5))
     line.title = "cos sin and cos - sin"
     line._in_browser()