improve filtering for adding Characters to Character groups (Issue #200)

www/analytics/plugins/ImageGraph/StaticGraph/Evolution.php

@@ -0,0 +1,30 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik\Plugins\ImageGraph\StaticGraph;
+
+
+/**
+ *
+ */
+class Evolution extends GridGraph
+{
+
+    public function renderGraph()
+    {
+        $this->initGridChart(
+            $displayVerticalGridLines = true,
+            $bulletType = LEGEND_FAMILY_LINE,
+            $horizontalGraph = false,
+            $showTicks = true,
+            $verticalLegend = true
+        );
+
+        $this->pImage->drawLineChart();
+    }
+}