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<?php
/**
* File containing the abstract ezcGraphPieChart 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 pie chart.
*
* @package Graph
*/
class ezcGraphPieChart extends ezcGraphChart
{
public function __construct( array $options = array() )
{
$this->options = new ezcGraphPieChartOptions( $options );
parent::__construct( $options );
}
/**
* Adds a dataset to the charts data
*
* @param string $name Name of dataset
* @param mixed $values Values to create dataset with
* @throws ezcGraphTooManyDataSetExceptions
* If too many datasets are created
* @return ezcGraphDataSet
*/
protected function addDataSet( $name, $values )
{
if ( count( $this->data ) >= 1 &&
!isset( $this->data[$name] ) )
{
throw new ezcGraphTooManyDataSetsExceptions( $name );
}
else
{
parent::addDataSet( $name, $values );
// Colorize each data element
foreach ( $this->data[$name] as $label => $value )
{
$this->data[$name]->color[$label] = $this->palette->dataSetColor;
}
}
}
protected function renderData( $renderer, $boundings )
{
// Only draw the first (and only) dataset
$dataset = reset( $this->data );
$this->driver->options->font = $this->options->font;
// Calculate sum of all values to be able to calculate percentage
$sum = 0;
foreach ( $dataset as $value )
{
$sum += $value;
}
$angle = 0;
foreach ( $dataset as $label => $value )
{
$renderer->drawPieSegment(
$boundings,
$dataset->color[$label],
$angle,
$angle += $value / $sum * 360,
sprintf( $this->options->label, $label, $value, $value / $sum * 100 ),
$dataset->highlight[$label]
);
}
}
/**
* Render a pie chart
*
* @param ezcGraphRenderer $renderer
* @access public
* @return void
*/
public function render( $width, $height, $file = null )
{
// Set image properties in driver
$this->driver->options->width = $width;
$this->driver->options->height = $height;
// Generate legend
$this->elements['legend']->generateFromDataSet( reset( $this->data ) );
// Get boundings from parameters
$this->options->width = $width;
$this->options->height = $height;
$boundings = new ezcGraphBoundings();
$boundings->x1 = $this->options->width;
$boundings->y1 = $this->options->height;
// Render subelements
foreach ( $this->elements as $name => $element )
{
// Skip element, if it should not get rendered
if ( $this->renderElement[$name] === false )
{
continue;
}
$this->driver->options->font = $element->font;
$boundings = $element->render( $this->renderer, $boundings );
}
// Render graph
$this->renderData( $this->renderer, $boundings );
if ( !empty( $file ) )
{
$this->renderer->render( $file );
}
}
}
?>
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