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File: graph.pie.php
<?php
// (c) Copyright 2002-2015 by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id: graph.pie.php 53803 2015-02-06 00:42:50Z jyhem $

require_once 'lib/graph-engine/core.php';

/**
 * PieChartGraphic
 *
 * @uses Graphic
 */
class PieChartGraphic extends Graphic
{
	var $pie_data;

	function PieChartGraphic()
	{
		Graphic::Graphic();
		$this->pie_data = array();
	}

	function getRequiredSeries()
	{
		return array(
			'label' => false,
			'value' => true,
			'color' => false,
			'style' => false
		);
	}

	function _handleData( $data )
	{
		$elements = count($data['value']);

		if ( !isset( $data['color'] ) ) {
			$data['color'] = array();
			for ( $i = 0; $elements > $i; ++$i )
				$data['color'][] = $this->_getColor();
		}

		if ( !isset( $data['style'] ) )
			for ( $i = 0; $elements > $i; ++$i )
				$data['style'][] = 'FillStroke-' . $data['color'][$i];

		if ( isset($data['label']) )
			foreach ( $data['label'] as $key => $label )
				$this->addLegend($data['color'][$key], $label);

		$total = array_sum($data['value']);
		foreach ( $data['value'] as $key => $value )
			if ( is_numeric($value) )
				$this->pie_data[] = array($data['style'][$key], $value / $total * 360);

		return true;
	}

	function _drawContent( &$renderer )
	{
		$layout = $this->_layout();
		$centerX = $layout['pie-center-x'];
		$centerY = $layout['pie-center-y'];
		$radius = $layout['pie-radius'];

		$base = 0;

		foreach ( $this->pie_data as $info ) {
			list($style, $degree) = $info;
			$renderer->drawPie(
				$centerX,
				$centerY,
				$radius,
				$base,
				$base + $degree,
				$renderer->getStyle($style)
			);

			$base += $degree;
		}
	}

	function _drawLegendBox( &$renderer, $color )
	{
		$renderer->drawRectangle(0, 0, 1, 1, $renderer->getStyle("FillStroke-$color"));
	}

	function _default()
	{
		return array_merge(
			parent::_default(),
			array(
				'pie-center-x' => 0.5,
				'pie-center-y' => 0.5,
				'pie-radius' => 0.4
			)
		);
	}
}