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PieChart.php
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Sat, Oct 4, 6:19 PM

PieChart.php
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<?php
/* Libchart - PHP chart library
* Copyright (C) 2005-2007 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
defined('FULL_PATH') or die('restricted access!');
/**
* Pie chart.
*
* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
*/
class LibchartPieChart extends LibchartChart {
protected $pieCenterX;
protected $pieCenterY;
/**
* Constructor of a pie chart.
*
* @param integer width of the image
* @param integer height of the image
*/
public function __construct($width = 600, $height = 250) {
parent::__construct($width, $height);
$this->plot->setGraphPadding(new LibchartPadding(15, 10, 30, 30));
}
/**
* Computes the layout.
*/
protected function computeLayout() {
$this->plot->setHasCaption(true);
$this->plot->computeLayout();
// Get the graph area
$graphArea = $this->plot->getGraphArea();
// Compute the coordinates of the pie
$this->pieCenterX = $graphArea->x1 + ($graphArea->x2 - $graphArea->x1) / 2;
$this->pieCenterY = $graphArea->y1 + ($graphArea->y2 - $graphArea->y1) / 2;
$this->pieWidth = round(($graphArea->x2 - $graphArea->x1) * 4 / 5);
$this->pieHeight = round(($graphArea->y2 - $graphArea->y1) * 3.7 / 5);
$this->pieDepth = round($this->pieWidth * 0.05);
}
/**
* Compare two sampling point values, order from biggest to lowest value.
*
* @param double first value
* @param double second value
* @return integer result of the comparison
*/
protected function sortPie($v1, $v2) {
return $v1[0] == $v2[0] ? 0 :
$v1[0] > $v2[0] ? -1 :
1;
}
/**
* Compute pie values in percentage and sort them.
*/
protected function computePercent() {
$this->total = 0;
$this->percent = array();
$pointList = $this->dataSet->getPointList();
foreach ($pointList as $point) {
$this->total += $point->getY();
}
foreach ($pointList as $point) {
$percent = $this->total == 0 ? 0 : 100 * $point->getY() / $this->total;
array_push($this->percent, array($percent, $point));
}
usort($this->percent, array("PieChart", "sortPie"));
}
/**
* Creates the pie chart image.
*/
protected function createImage() {
parent::createImage();
// Get graphical obects
$img = $this->plot->getImg();
$palette = $this->plot->getPalette();
$primitive = $this->plot->getPrimitive();
// Get the graph area
$graphArea = $this->plot->getGraphArea();
// Legend box
$primitive->outlinedBox($graphArea->x1, $graphArea->y1, $graphArea->x2, $graphArea->y2, $palette->axisColor[0], $palette->axisColor[1]);
// Aqua-like background
for ($i = $graphArea->y1 + 2; $i < $graphArea->y2 - 1; $i++) {
$color = $palette->aquaColor[($i + 3) % 4];
$primitive->line($graphArea->x1 + 2, $i, $graphArea->x2 - 2, $i, $color);
}
}
/**
* Renders the caption.
*/
protected function printCaption() {
// Create a list of labels
$labelList = array();
foreach($this->percent as $percent) {
list($percent, $point) = $percent;
$label = $point->getX();
array_push($labelList, $label);
}
// Create the caption
$caption = new LibchartCaption();
$caption->setPlot($this->plot);
$caption->setLabelList($labelList);
$palette = $this->plot->getPalette();
$pieColorSet = $palette->pieColorSet;
$caption->setColorSet($pieColorSet);
// Render the caption
$caption->render();
}
/**
* Draw a 2D disc.
*
* @param integer center coordinate (y)
* @param array colors for each portion
* @param bitfield drawing mode
*/
protected function drawDisc($cy, $colorArray, $mode) {
// Get graphical obects
$img = $this->plot->getImg();
$i = 0;
$angle1 = 0;
$percentTotal = 0;
foreach ($this->percent as $a) {
list ($percent, $point) = $a;
$color = $colorArray[$i % count($colorArray)];
$percentTotal += $percent;
$angle2 = $percentTotal * 360 / 100;
imagefilledarc($img, $this->pieCenterX, $cy, $this->pieWidth, $this->pieHeight, $angle1, $angle2, $color->getColor($img), $mode);
$angle1 = $angle2;
$i++;
}
}
/**
* Print the percentage text.
*/
protected function drawPercent() {
// Get graphical obects
$img = $this->plot->getImg();
$palette = $this->plot->getPalette();
$text = $this->plot->getText();
$primitive = $this->plot->getPrimitive();
$angle1 = 0;
$percentTotal = 0;
foreach ($this->percent as $a) {
list ($percent, $point) = $a;
// If value is null, don't print percentage
if ($percent <= 0) {
continue;
}
$percentTotal += $percent;
$angle2 = $percentTotal * 2 * M_PI / 100;
$angle = $angle1 + ($angle2 - $angle1) / 2;
$label = number_format($percent) . "%";
$x = cos($angle) * ($this->pieWidth + 35) / 2 + $this->pieCenterX;
$y = sin($angle) * ($this->pieHeight + 35) / 2 + $this->pieCenterY;
$text->printText($img, $x, $y, $this->plot->getTextColor(), $label, $text->fontCondensed, $text->HORIZONTAL_CENTER_ALIGN | $text->VERTICAL_CENTER_ALIGN);
$angle1 = $angle2;
}
}
/**
* Print the pie chart.
*/
protected function printPie() {
// Get graphical obects
$img = $this->plot->getImg();
$palette = $this->plot->getPalette();
$text = $this->plot->getText();
$primitive = $this->plot->getPrimitive();
// Get the pie color set
$pieColorSet = $palette->pieColorSet;
$pieColorSet->reset();
// Silhouette
for ($cy = $this->pieCenterY + $this->pieDepth / 2; $cy >= $this->pieCenterY - $this->pieDepth / 2; $cy--) {
$this->drawDisc($cy, $palette->pieColorSet->shadowColorList, IMG_ARC_EDGED);
}
// Top
$this->drawDisc($this->pieCenterY - $this->pieDepth / 2, $palette->pieColorSet->colorList, IMG_ARC_PIE);
// Top Outline
$this->drawPercent();
}
/**
* Render the chart image.
*
* @param string name of the file to render the image to (optional)
*/
public function render($fileName = null) {
$this->computePercent();
$this->computeLayout();
$this->createImage();
$this->plot->printLogo();
$this->plot->printTitle();
$this->printPie();
$this->printCaption();
$this->plot->render($fileName);
}
}

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