1 files changed, 167 insertions, 0 deletions
diff --git a/library/Icinga/Chart/Unit/CalendarUnit.php b/library/Icinga/Chart/Unit/CalendarUnit.php
new file mode 100644
index 0000000..7ce6a99
--- /dev/null
+++ b/library/Icinga/Chart/Unit/CalendarUnit.php
@@ -0,0 +1,167 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+
+namespace Icinga\Chart\Unit;
+
+use DateTime;
+
+/**
+ * Calendar Axis Unit that transforms timestamps into user-readable values
+ *
+ */
+class CalendarUnit extends LinearUnit
+{
+    /**
+     * Constant for a minute
+     */
+    const MINUTE    = 60;
+
+    /**
+     * Constant for an hour
+     */
+    const HOUR      = 3600;
+
+    /**
+     * Constant for a day
+     */
+    const DAY       = 864000;
+
+    /**
+     * Constant for ~a month
+     * 30 Days, this is sufficient for our needs
+     */
+    const MONTH     = 2592000; // x
+
+    /**
+     * An array containing all labels that will be displayed
+     *
+     * @var array
+     */
+    private $labels = array();
+
+    /**
+     * The date format to use
+     *
+     * @var string
+     */
+    private $dateFormat = 'd-m';
+
+    /**
+     * The time format to use
+     *
+     * @var string
+     */
+    private $timeFormat = 'g:i:s';
+
+    /**
+     * Create the labels for the given dataset
+     */
+    private function createLabels()
+    {
+        $this->labels = array();
+        $duration = $this->getMax() - $this->getMin();
+
+        if ($duration <= self::HOUR) {
+            $unit = self::MINUTE;
+        } elseif ($duration <= self::DAY) {
+            $unit = self::HOUR;
+        } elseif ($duration <= self::MONTH) {
+            $unit = self::DAY;
+        } else {
+            $unit = self::MONTH;
+        }
+        $this->calculateLabels($unit);
+    }
+
+    /**
+     * Calculate the labels for this dataset
+     *
+     * @param integer $unit The unit to use as the basis for calculation
+     */
+    private function calculateLabels($unit)
+    {
+        $fac = new DateTime();
+
+        $duration = $this->getMax() - $this->getMin();
+
+        // Calculate number of ticks, but not more than 30
+        $tickCount = ($duration/$unit * 10);
+        if ($tickCount > 30) {
+            $tickCount = 30;
+        }
+
+        $step = $duration / $tickCount;
+        $format = $this->timeFormat;
+        if ($unit === self::DAY) {
+            $format = $this->dateFormat;
+        } elseif ($unit === self::MONTH) {
+            $format = $this->dateFormat;
+        }
+
+        for ($i = 0; $i <= $duration; $i += $step) {
+            $this->labels[] = $fac->setTimestamp($this->getMin() + $i)->format($format);
+        }
+    }
+
+    /**
+     * Add a dataset to this CalendarUnit and update labels
+     *
+     * @param   array   $dataset    The dataset to update
+     * @param   int     $idx        The index to use for determining the data
+     *
+     * @return  $this                Fluid interface
+     */
+    public function addValues(array $dataset, $idx = 0)
+    {
+        parent::addValues($dataset, $idx);
+        $this->createLabels();
+        return $this;
+    }
+
+    /**
+     * Return the current axis relative position
+     *
+     * @return int The position of the next tick (between 0 and 100)
+     */
+    public function current()
+    {
+        return 100 * (key($this->labels) / count($this->labels));
+    }
+
+    /**
+     * Move to next tick
+     */
+    public function next()
+    {
+        next($this->labels);
+    }
+
+    /**
+     * Return the current tick caption
+     *
+     * @return string
+     */
+    public function key()
+    {
+        return current($this->labels);
+    }
+
+    /**
+     * Return true when the iterator is in a valid range
+     *
+     * @return bool
+     */
+    public function valid()
+    {
+        return current($this->labels) !== false;
+    }
+
+    /**
+     * Rewind the internal array
+     */
+    public function rewind()
+    {
+        reset($this->labels);
+    }
+}