1 files changed, 143 insertions, 0 deletions
diff --git a/library/Icinga/Chart/Graph/Tooltip.php b/library/Icinga/Chart/Graph/Tooltip.php
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+++ b/library/Icinga/Chart/Graph/Tooltip.php
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+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Chart\Graph;
+
+/**
+ * A tooltip that stores and aggregates information about displayed data
+ * points of a graph and replaces them in a format string to render the description
+ * for specific data points of the graph.
+ *
+ * When render() is called, placeholders for the keys for each data entry will be replaced by
+ * the current value of this data set and the formatted string will be returned.
+ * The content of the replaced keys can change for each data set and depends on how the data
+ * is passed to this class. There are several types of properties:
+ *
+ * <ul>
+ *  <li>Global properties</li>:     Key-value pairs that stay the same every time render is called, and are
+ *                                  passed to an instance in the constructor.
+ *  <li>Aggregated properties</li>: Global properties that are created automatically from
+ *                                  all attached data points.
+ *  <li>Local properties</li>:      Key-value pairs that only apply to a single data point and
+ *                                  are passed to the render-function.
+ * </ul>
+ */
+class Tooltip
+{
+    /**
+     * The default format string used
+     * when no other format is specified
+     *
+     * @var string
+     */
+    private $defaultFormat;
+
+    /**
+     * All aggregated points
+     *
+     * @var array
+     */
+    private $points = array();
+
+    /**
+     * Contains all static replacements
+     *
+     * @var array
+     */
+    private $data = array(
+        'sum' => 0
+    );
+
+    /**
+     * Used to format the displayed tooltip.
+     *
+     * @var string
+     */
+    protected $tooltipFormat;
+
+    /**
+     * Create a new tooltip with the specified default format string
+     *
+     * Allows you to set the global data for this tooltip, that is displayed every
+     * time render is called.
+     *
+     * @param array     $data   Map of global properties
+     * @param string    $format The default format string
+     */
+    public function __construct(
+        $data = array(),
+        $format = '<b>{title}</b>: {value} {label}'
+    ) {
+        $this->data = array_merge($this->data, $data);
+        $this->defaultFormat = $format;
+    }
+
+    /**
+     * Add a single data point to update the aggregated properties for this tooltip
+     *
+     * @param $point  array   Contains the (x,y) values of the data set
+     */
+    public function addDataPoint($point)
+    {
+        // set x-value
+        if (!isset($this->data['title'])) {
+            $this->data['title'] = $point[0];
+        }
+
+        // aggregate y-values
+        $y = (int)$point[1];
+        if (isset($point[2])) {
+            // load original value in case value already aggregated
+            $y = (int)$point[2];
+        }
+
+        if (!isset($this->data['min']) || $this->data['min'] > $y) {
+            $this->data['min'] = $y;
+        }
+        if (!isset($this->data['max']) || $this->data['max'] < $y) {
+            $this->data['max'] = $y;
+        }
+        $this->data['sum'] += $y;
+        $this->points[] = $y;
+    }
+
+    /**
+     * Format the tooltip for a certain data point
+     *
+     * @param array     $order      Which data set to render
+     * @param array     $data       The local data for this tooltip
+     * @param string    $format     Use a custom format string for this data set
+     *
+     * @return mixed|string The tooltip value
+     */
+    public function render($order, $data = array(), $format = null)
+    {
+        if (isset($format)) {
+            $str = $format;
+        } else {
+            $str = $this->defaultFormat;
+        }
+        $data['value'] = $this->points[$order];
+        foreach (array_merge($this->data, $data) as $key => $value) {
+            $str = str_replace('{' . $key . '}', $value, $str);
+        }
+        return $str;
+    }
+
+    /**
+     * Format the tooltip for a certain data point but remove all
+     * occurring html tags
+     *
+     * This is useful for rendering clean tooltips on client without JavaScript
+     *
+     * @param array     $order      Which data set to render
+     * @param array     $data       The local data for this tooltip
+     * @param string    $format     Use a custom format string for this data set
+     *
+     * @return mixed|string The tooltip value, without any HTML tags
+     */
+    public function renderNoHtml($order, $data, $format)
+    {
+        return strip_tags($this->render($order, $data, $format));
+    }
+}