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<?php
/**
* File containing the abstract ezcGraphChartElementLabeledAxis class
*
* @package Graph
* @version //autogentag//
* @copyright Copyright (C) 2005, 2006 eZ systems as. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* Class to represent a axe as a chart element
*
* @package Graph
*/
class ezcGraphChartElementLabeledAxis extends ezcGraphChartElementAxis
{
/**
* Array with labeles for data
*
* @var array
*/
protected $labels = array();
/**
* Reduced amount of labels which will be displayed in the chart
*
* @var array
*/
protected $displayedLabels = array();
/**
* Maximum count of labels which can be displayed on one axis
* @TODO: Perhaps base this on the chart size
*/
const MAX_LABEL_COUNT = 10;
public function __construct( array $options = array() )
{
$this->axisLabelRenderer = new ezcGraphAxisCenteredLabelRenderer();
parent::__construct( $options );
}
protected function increaseKeys( $array, $startKey )
{
foreach ( $array as $key => $value )
{
if ( $key === $startKey )
{
// Recursive check, if next key should be increased, too
if ( isset ( $array[$key + 1] ) )
{
$array = $this->increaseKeys( $array, $key + 1 );
}
// Increase key
$array[$key + 1] = $array[$key];
unset( $array[$key] );
}
}
return $array;
}
/**
* Add data for this axis
*
* @param mixed $value Value which will be displayed on this axis
* @return void
*/
public function addData( array $values )
{
$position = 0;
foreach ( $values as $label )
{
$label = (string) $label;
if ( !in_array( $label, $this->labels, true ) )
{
if ( isset( $this->labels[$position] ) )
{
$this->labels = $this->increaseKeys( $this->labels, $position );
$this->labels[$position++] = $label;
}
else
{
$this->labels[$position++] = $label;
}
}
else
{
$position = array_search( $label, $this->labels, true ) + 1;
}
}
ksort( $this->labels );
}
/**
* Calculate axis bounding values on base of the assigned values
*
* @abstract
* @access public
* @return void
*/
public function calculateAxisBoundings()
{
$labelCount = count( $this->labels ) - 1;
if ( $labelCount <= self::MAX_LABEL_COUNT )
{
$this->displayedLabels = $this->labels;
return true;
}
for ( $div = self::MAX_LABEL_COUNT; $div > 0; --$div )
{
if ( ( $labelCount % $div ) === 0 )
{
$step = $labelCount / $div;
foreach ( $this->labels as $nr => $label )
{
if ( ( $nr % $step ) === 0 )
{
$this->displayedLabels[] = $label;
}
}
return true;
}
}
}
/**
* Get coordinate for a dedicated value on the chart
*
* @param ezcGraphBounding $boundings
* @param string $value Value to determine position for
* @return float Position on chart
*/
public function getCoordinate( $value )
{
if ( $value === false ||
$value === null ||
( $key = array_search( $value, $this->labels ) ) === false )
{
switch ( $this->position )
{
case ezcGraph::LEFT:
case ezcGraph::TOP:
return 0.;
case ezcGraph::RIGHT:
case ezcGraph::BOTTOM:
return 1.;
}
}
else
{
switch ( $this->position )
{
case ezcGraph::LEFT:
case ezcGraph::TOP:
return (float) $key / ( count ( $this->labels ) - 1 );
case ezcGraph::BOTTOM:
case ezcGraph::RIGHT:
return (float) 1 - $key / ( count ( $this->labels ) - 1 );
}
}
}
/**
* Return count of minor steps
*
* @return integer Count of minor steps
*/
public function getMinorStepCount()
{
return 0;
}
/**
* Return count of major steps
*
* @return integer Count of major steps
*/
public function getMajorStepCount()
{
return count( $this->displayedLabels ) - 1;
}
/**
* Get label for a dedicated step on the axis
*
* @param integer $step Number of step
* @return string label
*/
public function getLabel( $step )
{
if ( isset( $this->displayedLabels[$step] ) )
{
return $this->displayedLabels[$step];
}
else
{
return false;
}
}
}
?>
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