- Added and improved documentation

3 files changed, 65 insertions, 9 deletions

diff --git a/src/axis/date.php b/src/axis/date.php
index 601119a..7bb8e1c 100644
--- a/src/axis/date.php
+++ b/src/axis/date.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * File containing the abstract ezcGraphChartElementDateAxis class
+ * File containing the ezcGraphChartElementDateAxis class
  *
  * @package Graph
  * @version //autogentag//
@@ -8,7 +8,13 @@
  * @license http://ez.no/licenses/new_bsd New BSD License
  */
 /**
- * Class to represent a axe as a chart element
+ * Class to represent date axis. Date axis will try to find a "nice" interval
+ * based on the values on the x axis. If non numeric values are given, 
+ * ezcGraphChartElementDateAxis will convert them to timestamps using PHPs 
+ * strtotime function.
+ *
+ * It is always possible to set start date, end date and the interval manually
+ * by yourself.
  *
  * @property float $startDate
  *           Starting date used to display on axis.
@@ -192,6 +198,16 @@ class ezcGraphChartElementDateAxis extends ezcGraphChartElementAxis
         $this->properties['interval'] = $interval;
     }
 
+    /**
+     * Calculate lower nice date
+     *
+     * Calculates a date which is earlier or equal to the given date, and is
+     * divisible by the given interval.
+     * 
+     * @param int $min Date
+     * @param int $interval Interval 
+     * @return int Earlier date
+     */
     protected function calculateLowerNiceDate( $min, $interval )
     {
         $dateSteps = array( 60, 60, 24, 7, 52 );
@@ -225,11 +241,33 @@ class ezcGraphChartElementDateAxis extends ezcGraphChartElementAxis
         );
     }
 
+    /**
+     * Calculate start date
+     *
+     * Use calculateLowerNiceDate to get a date earlier or equal date then the 
+     * minimum date to use it as the start date for the axis depending on the
+     * selected interval.
+     * 
+     * @param mixed $min Minimum date
+     * @param mixed $max Maximum date
+     * @return void
+     */
     public function calculateMinimum( $min, $max )
     {
         $this->properties['startDate'] = $this->calculateLowerNiceDate( $min, $this->interval );
     }
 
+    /**
+     * Calculate end date
+     *
+     * Use calculateLowerNiceDate to get a date later or equal date then the 
+     * maximum date to use it as the end date for the axis depending on the
+     * selected interval.
+     * 
+     * @param mixed $min Minimum date
+     * @param mixed $max Maximum date
+     * @return void
+     */
     public function calculateMaximum( $min, $max )
     {
         $this->properties['endDate'] = $this->calculateLowerNiceDate( $max, $this->interval );
@@ -243,8 +281,6 @@ class ezcGraphChartElementDateAxis extends ezcGraphChartElementAxis
     /**
      * Calculate axis bounding values on base of the assigned values 
      * 
-     * @abstract
-     * @access public
      * @return void
      */
     public function calculateAxisBoundings()
diff --git a/src/axis/labeled.php b/src/axis/labeled.php
index 7b1225c..bbfd102 100644
--- a/src/axis/labeled.php
+++ b/src/axis/labeled.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * File containing the abstract ezcGraphChartElementLabeledAxis class
+ * File containing the ezcGraphChartElementLabeledAxis class
  *
  * @package Graph
  * @version //autogentag//
@@ -8,7 +8,8 @@
  * @license http://ez.no/licenses/new_bsd New BSD License
  */
 /**
- * Class to represent a axe as a chart element
+ * Class to represent a labeled axis. Values on the x axis are considered as 
+ * strings and used in the given order.
  *
  * @package Graph
  */
@@ -35,6 +36,13 @@ class ezcGraphChartElementLabeledAxis extends ezcGraphChartElementAxis
      */
     const MAX_LABEL_COUNT = 10;
 
+    /**
+     * Constructor
+     * 
+     * @param array $options Default option array
+     * @return void
+     * @ignore
+     */
     public function __construct( array $options = array() )
     {
         $this->axisLabelRenderer = new ezcGraphAxisCenteredLabelRenderer();
@@ -42,7 +50,15 @@ class ezcGraphChartElementLabeledAxis extends ezcGraphChartElementAxis
         parent::__construct( $options );
     }
 
-    protected function increaseKeys( $array, $startKey )
+    /**
+     * Increase the keys of all elements in the array up from the start key, to
+     * insert an additional element at the correct position.
+     * 
+     * @param array $array Array
+     * @param int $startKey Key to increase keys from
+     * @return array Updated array
+     */
+    protected function increaseKeys( array $array, $startKey )
     {
         foreach ( $array as $key => $value )
         {
diff --git a/src/axis/numeric.php b/src/axis/numeric.php
index 1bf3cfe..85da3f6 100644
--- a/src/axis/numeric.php
+++ b/src/axis/numeric.php
@@ -8,7 +8,12 @@
  * @license http://ez.no/licenses/new_bsd New BSD License
  */
 /**
- * Class to represent a axe as a chart element
+ * Class to represent a numeric axis. The axis tries to calculate "nice" start
+ * and end values for the axis scale. The used interval is considered as nice, 
+ * if it is equal to [1,2,5] * 10^x with x in [.., -1, 0, 1, ..].
+ *
+ * The start and end value are the next bigger / smaller multiple of the 
+ * intervall compared to the maximum / minimum axis value.
  *
  * @property float $min
  *           Minimum value of displayed scale on axis.
@@ -19,7 +24,6 @@
  * @property float $maxValue
  *           Maximum value to display on this axis.
  *           
- *
  * @package Graph
  */
 class ezcGraphChartElementNumericAxis extends ezcGraphChartElementAxis