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<?php
/**
* File containing the 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 for pie charts. Can only use one dataset which will be dispalyed as a
* pie chart.
*
* <code>
* // Create a new line chart
* $chart = new ezcGraphLineChart();
*
* // Add data to line chart
* $chart->data['sample dataset'] = new ezcGraphArrayDataSet(
* array(
* 'one' => 1.2,
* 'two' => 43.2,
* 'three' => -34.14,
* 'four' => 65,
* 'five' => 123,
* )
* );
*
* // Render chart with default 2d renderer and default SVG driver
* $chart->render( 500, 200, 'line_chart.svg' );
* </code>
*
* @package Graph
* @mainclass
*/
class ezcGraphPieChart extends ezcGraphChart
{
/**
* Constructor
*
* @param array $options Default option array
* @return void
* @ignore
*/
public function __construct( array $options = array() )
{
$this->options = new ezcGraphPieChartOptions( $options );
parent::__construct( $options );
$this->data = new ezcGraphChartSingleDataContainer( $this );
}
/**
* Render the assigned data
*
* Will renderer all charts data in the remaining boundings after drawing
* all other chart elements. The data will be rendered depending on the
* settings in the dataset.
*
* @param ezcGraphRenderer $renderer Renderer
* @param ezcGraphBoundings $boundings Remaining boundings
* @return void
*/
protected function renderData( ezcGraphRenderer $renderer, ezcGraphBoundings $boundings )
{
// Only draw the first (and only) dataset
$dataset = $this->data->rewind();
$datasetName = $this->data->key();
$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;
}
if ( $this->options->sum !== false )
{
$sum = max( $sum, $this->options->sum );
}
$angle = 0;
foreach ( $dataset as $label => $value )
{
switch ( $dataset->displayType->default )
{
case ezcGraph::PIE:
$displayLabel = ( $this->options->labelCallback !== null
? call_user_func( $this->options->labelCallback, $label, $value, $value / $sum )
: sprintf( $this->options->label, $label, $value, $value / $sum * 100 ) );
$renderer->drawPieSegment(
$boundings,
new ezcGraphContext( $datasetName, $label ),
$dataset->color[$label],
$angle,
$angle += $value / $sum * 360,
$displayLabel,
$dataset->highlight[$label]
);
break;
default:
throw new ezcGraphInvalidDisplayTypeException( $dataset->displayType->default );
break;
}
}
}
/**
* Returns the default display type of the current chart type.
*
* @return int Display type
*/
public function getDefaultDisplayType()
{
return ezcGraph::PIE;
}
/**
* Apply tresh hold
*
* Iterates over the dataset and applies the configured tresh hold to
* the datasets data.
*
* @return void
*/
protected function applyThreshold()
{
if ( $this->options->percentThreshold || $this->options->absoluteThreshold )
{
$dataset = $this->data->rewind();
$sum = 0;
foreach ( $dataset as $value )
{
$sum += $value;
}
if ( $this->options->sum !== false )
{
$sum = max( $sum, $this->options->sum );
}
$unset = array();
foreach ( $dataset as $label => $value )
{
if ( $label === $this->options->summarizeCaption )
{
continue;
}
if ( ( $value <= $this->options->absoluteThreshold ) ||
( ( $value / $sum ) <= $this->options->percentThreshold ) )
{
if ( !isset( $dataset[$this->options->summarizeCaption] ) )
{
$dataset[$this->options->summarizeCaption] = $value;
}
else
{
$dataset[$this->options->summarizeCaption] += $value;
}
$unset[] = $label;
}
}
foreach ( $unset as $label )
{
unset( $dataset[$label] );
}
}
}
/**
* Render the pie chart
*
* Renders the chart into a file or stream. The width and height are
* needed to specify the dimensions of the resulting image. For direct
* output use 'php://stdout' as output file.
*
* @param int $width Image width
* @param int $height Image height
* @param string $file Output file
* @return void
*/
public function render( $width, $height, $file = null )
{
if ( !count( $this->data ) )
{
throw new ezcGraphNoDataException();
}
// Set image properties in driver
$this->driver->options->width = $width;
$this->driver->options->height = $height;
// Apply tresh hold
$this->applyThreshold();
// Generate legend
$this->elements['legend']->generateFromDataSet( $this->data->rewind() );
// 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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