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-rw-r--r--library/Icinga/Chart/Unit/AxisUnit.php56
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diff --git a/library/Icinga/Chart/Unit/AxisUnit.php b/library/Icinga/Chart/Unit/AxisUnit.php
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+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Chart\Unit;
+
+use Iterator;
+
+/**
+ * Base class for Axis Units
+ *
+ * An AxisUnit takes a set of values and places them on a given range
+ *
+ * Concrete subclasses must implement the iterator interface, with
+ * getCurrent returning the axis relative position and getValue the label
+ * that will be displayed
+ */
+interface AxisUnit extends Iterator
+{
+ /**
+ * Add a dataset to this AxisUnit, required for dynamic min and max vlaues
+ *
+ * @param array $dataset The dataset that will be shown in the Axis
+ * @param int $id The idx in the dataset (0 for x, 1 for y)
+ */
+ public function addValues(array $dataset, $id = 0);
+
+ /**
+ * Transform the given absolute value in an axis relative value
+ *
+ * @param int $value The absolute, dataset dependent value
+ *
+ * @return int An axis relative value
+ */
+ public function transform($value);
+
+ /**
+ * Set the axis minimum value to a fixed value
+ *
+ * @param int $min The new minimum value
+ */
+ public function setMin($min);
+
+ /**
+ * Set the axis maximum value to a fixed value
+ *
+ * @param int $max The new maximum value
+ */
+ public function setMax($max);
+
+ /**
+ * Get the amount of ticks of this axis
+ *
+ * @return int
+ */
+ public function getTicks();
+}