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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;
}
// Calculate position and size of pie
$center = new ezcGraphCoordinate(
(int) round( $boundings->x0 + ( $boundings->x1 - $boundings->x0 ) / 2 ),
(int) round( $boundings->y0 + ( $boundings->y1 - $boundings->y0 ) / 2 )
);
// Limit radius to fourth of width and half of height at maximum
$radius = min(
( $boundings->x1 - $boundings->x0 ) / 4,
( $boundings->y1 - $boundings->y0 ) / 2
);
// Draw all data
$angle = 0.;
$labels = array();
foreach ( $dataset as $label => $value )
{
$renderer->drawPieSegment(
$dataset->color[$label],
$center,
$radius * ( 1 - $this->options->moveOut ),
$angle,
$endAngle = $angle + $value / $sum * 360,
( $dataset->highlight[$label] ? $radius * $this->options->moveOut : 0 )
);
// Determine position of label
$middle = $angle + ( $endAngle - $angle ) / 2;
$pieSegmentCenter = new ezcGraphCoordinate(
(int) round( cos( deg2rad( $middle ) ) * $radius + $center->x ),
(int) round( sin( deg2rad( $middle ) ) * $radius + $center->y )
);
// Split labels up into left an right size and index them on their
// y position
$labels[(int) ($pieSegmentCenter->x > $center->x)][$pieSegmentCenter->y] = array(
new ezcGraphCoordinate(
(int) round( cos( deg2rad( $middle ) ) * $radius * 2 / 3 + $center->x ),
(int) round( sin( deg2rad( $middle ) ) * $radius * 2 / 3 + $center->y )
),
sprintf( $this->options->label, $label, $value, $value * 100 / $sum )
);
$angle = $endAngle;
}
$labelHeight = (int) round( min(
( $boundings->y1 - $boundings->y0 ) / count( $labels[0] ),
( $boundings->y1 - $boundings->y0 ) / count( $labels[1] ),
( $boundings->y1 - $boundings->y0 ) * $this->options->maxLabelHeight
) );
$symbolSize = $this->options->symbolSize;
// Finally draw labels
foreach ( $labels as $side => $labelPart )
{
$minHeight = $boundings->y0;
$toShare = ( $boundings->y1 - $boundings->y0 ) - count( $labelPart ) * $labelHeight;
// Sort to draw topmost label first
ksort( $labelPart );
$sign = ( $side ? -1 : 1 );
foreach ( $labelPart as $height => $label )
{
// Determine position of label
$minHeight += round( max( 0, $height - $minHeight ) / ( $boundings->y1 - $boundings->y0 ) * $toShare );
$labelPosition = new ezcGraphCoordinate(
(int) round(
$center->x -
$sign * (
cos ( asin ( ( $center->y - $minHeight - $labelHeight / 2 ) / $radius ) ) * $radius +
$symbolSize * (int) $this->options->showSymbol
)
),
(int) round( $minHeight + $labelHeight / 2 )
);
if ( $this->options->showSymbol )
{
// Draw label
$renderer->drawLine(
$this->options->font->color,
$label[0],
$labelPosition,
false
);
$renderer->drawSymbol(
$this->options->font->color,
new ezcGraphCoordinate(
$label[0]->x - $symbolSize / 2,
$label[0]->y - $symbolSize / 2
),
$symbolSize,
$symbolSize,
ezcGraph::BULLET
);
$renderer->drawSymbol(
$this->options->font->color,
new ezcGraphCoordinate(
$labelPosition->x - $symbolSize / 2,
$labelPosition->y - $symbolSize / 2
),
$symbolSize,
$symbolSize,
ezcGraph::BULLET
);
}
$renderer->drawTextBox(
new ezcGraphCoordinate(
( !$side ? $boundings->x0 : $labelPosition->x + $symbolSize ),
$minHeight
),
$label[1],
(int) round( !$side ? $labelPosition->x - $boundings->x0 - $symbolSize : $boundings->x1 - $labelPosition->x - $symbolSize ),
$labelHeight,
( !$side ? ezcGraph::RIGHT : ezcGraph::LEFT ) | ezcGraph::MIDDLE
);
// Add used space to minHeight
$minHeight += $labelHeight;
}
}
}
/**
* 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 border and background
$boundings = $this->renderBorder( $boundings );
$boundings = $this->options->backgroundImage->render( $this->renderer, $boundings );
$boundings = $this->renderBackground( $boundings );
// 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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