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<?php
/**
* Pie graph implementation for the Horde_Graph package.
*
* $Horde: framework/Graph/Graph/Chart/pie.php,v 1.10.10.4 2006/01/01 21:28:18 jan Exp $
*
* Copyright 2002-2006 Chuck Hagenbuch <chuck@horde.org>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @since Horde 3.0
* @package Horde_Graph
*/
class Horde_Graph_Chart_pie {
var $graph;
var $_dataset;
var $_padding = 20;
var $_outline = true;
var $_colors = array('tan', 'palegoldenrod', 'olivedrab', 'blue', 'red', 'green', 'yellow',
'orange', 'gray', 'purple');
/**
"255,153,0",
"0,204,153",
"204,255,102",
"255,102,102",
"102,204,255",
"204,153,255",
"255,0,0",
"51,0,255",
"255,51,153",
"204,0,255",
"255,255,51",
"51,255,51",
"255,102,0");
*/
function Horde_Graph_Chart_pie(&$graph, $params)
{
$this->graph = &$graph;
foreach ($params as $param => $value) {
$key = '_' . $param;
$this->$key = $value;
}
}
function draw()
{
$data = $this->graph->_data['y'][$this->_dataset];
// Initialize some variables.
$diameter = min($this->graph->_graphWidth, $this->graph->_graphHeight) - ($this->_padding * 2);
$radius = $diameter / 2;
$count = count($data);
$xcenter = $this->graph->_graphLeft + $this->_padding + ($this->graph->_graphWidth / 2);
$ycenter = $this->graph->_graphTop + $this->_padding + ($this->graph->_graphHeight / 2);
// Calculate the sum of all slices.
$sum = 0;
foreach ($data as $x) {
$sum += $x;
}
// Convert each slice into the corresponding percentage of a
// 360-degree circle.
$degCount = 0;
$slices = array();
$degrees = array();
foreach ($data as $i => $y) {
if ((($y / $sum) * 360) > 0) {
$degrees[$degCount] = ($y / $sum) * 360;
$slices[$degCount] = $y;
$names[$degCount] = isset($this->graph->_data['x'][$i]) ? $this->graph->_data['x'][$i] : '';
$degCount++;
}
}
// Draw the baseline.
if ($count > 1) {
$last_angle = 0;
$count = count($degrees);
for ($z = 0; $z < $count; $z++) {
// Calculate and draw arcs corresponding to each
// slice.
$cz = $z % count($this->_colors);
$this->graph->img->arc($xcenter, $ycenter, $radius, $last_angle, ($last_angle + $degrees[$z]),
$this->_outline ? 'black' : $this->_colors[$cz], $this->_colors[$cz]);
$last_angle = $last_angle + $degrees[$z];
}
} else {
$this->graph->img->circle($xcenter, $ycenter, $radius, 'black', $this->_colors[0]);
}
// Create the color key and slice labels.
$yBase = $this->graph->_graphTop;
$xBase = 5;
$max = strlen((string)max($data));
for ($z = 0; $z < $degCount; $z++) {
$cz = $z % count($this->_colors);
$percent = ($degrees[$z] / 360) * 100;
$percent = round($percent, 2);
$yBase += 15;
$this->graph->img->rectangle($xBase, $yBase, 12, 12, 'black', $this->_colors[$cz]);
if ($slices[$z] >= 1000 && $slices[$z] < 1000000) {
$slices[$z] = $slices[$z] / 1000;
$slices[$z] = $slices[$z] . 'k';
}
$repeat = $max - strlen($slices[$z]);
if ($repeat < 0) {
$repeat = 0;
}
$slices[$z] = str_repeat(' ', $repeat) . $slices[$z];
$this->graph->img->text($slices[$z], $xBase + 20, ($yBase + 1));
$label = $names[$z] . ' (' . $percent . '%)';
if (strlen($label) > 20) {
$labels = explode("\n", wordwrap($label, 20));
foreach ($labels as $i => $label) {
if ($i > 0) {
$yBase += 15;
}
$this->graph->img->text($label, $xBase + 35 + ($max * 4), ($yBase + 1));
}
} else {
$this->graph->img->text($label, $xBase + 35 + ($max * 4), ($yBase + 1));
}
}
}
}
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