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261 lines
6.9 KiB
PHP
261 lines
6.9 KiB
PHP
<?php
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/* Libchart - PHP chart library
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* Copyright (C) 2005-2010 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Pie chart.
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*
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* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
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*/
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class PieChart extends Chart {
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protected $pieCenterX;
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protected $pieCenterY;
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/**
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* Constructor of a pie chart.
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*
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* @param integer width of the image
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* @param integer height of the image
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*/
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public function PieChart($width = 600, $height = 250) {
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parent::Chart($width, $height);
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$this->plot->setGraphPadding(new Padding(15, 10, 30, 30));
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}
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/**
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* Computes the layout.
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*/
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protected function computeLayout() {
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$this->plot->setHasCaption(true);
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$this->plot->computeLayout();
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// Get the graph area
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$graphArea = $this->plot->getGraphArea();
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// Compute the coordinates of the pie
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$this->pieCenterX = $graphArea->x1 + ($graphArea->x2 - $graphArea->x1) / 2;
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$this->pieCenterY = $graphArea->y1 + ($graphArea->y2 - $graphArea->y1) / 2;
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$this->pieWidth = round(($graphArea->x2 - $graphArea->x1) * 4 / 5);
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$this->pieHeight = round(($graphArea->y2 - $graphArea->y1) * 3.7 / 5);
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$this->pieDepth = round($this->pieWidth * 0.05);
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}
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/**
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* Compare two sampling point values, order from biggest to lowest value.
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*
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* @param double first value
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* @param double second value
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* @return integer result of the comparison
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*/
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protected function sortPie($v1, $v2) {
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return $v1[0] == $v2[0] ? 0 :
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$v1[0] > $v2[0] ? -1 :
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1;
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}
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/**
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* Compute pie values in percentage and sort them.
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*/
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protected function computePercent() {
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$this->total = 0;
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$this->percent = array();
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$pointList = $this->dataSet->getPointList();
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foreach ($pointList as $point) {
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$this->total += $point->getY();
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}
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foreach ($pointList as $point) {
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$percent = $this->total == 0 ? 0 : 100 * $point->getY() / $this->total;
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array_push($this->percent, array($percent, $point));
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}
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usort($this->percent, array("PieChart", "sortPie"));
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}
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/**
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* Creates the pie chart image.
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*/
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protected function createImage() {
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parent::createImage();
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// Get graphical obects
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$img = $this->plot->getImg();
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$palette = $this->plot->getPalette();
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$primitive = $this->plot->getPrimitive();
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// Get the graph area
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$graphArea = $this->plot->getGraphArea();
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// Legend box
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$primitive->outlinedBox($graphArea->x1, $graphArea->y1, $graphArea->x2, $graphArea->y2, $palette->axisColor[0], $palette->axisColor[1]);
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// Aqua-like background
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for ($i = $graphArea->y1 + 2; $i < $graphArea->y2 - 1; $i++) {
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$color = $palette->backgroundColor[($i + 3) % 4];
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$primitive->line($graphArea->x1 + 2, $i, $graphArea->x2 - 2, $i, $color);
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}
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}
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/**
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* Renders the caption.
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*/
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protected function printCaption() {
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// Create a list of labels
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$labelList = array();
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foreach($this->percent as $percent) {
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list($percent, $point) = $percent;
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$label = $point->getX();
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array_push($labelList, $label);
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}
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// Create the caption
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$caption = new Caption();
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$caption->setPlot($this->plot);
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$caption->setLabelList($labelList);
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$palette = $this->plot->getPalette();
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$pieColorSet = $palette->pieColorSet;
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$caption->setColorSet($pieColorSet);
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// Render the caption
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$caption->render();
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}
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/**
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* Draw a 2D disc.
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*
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* @param integer Center coordinate (y)
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* @param array Colors for each portion
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* @param bitfield Drawing mode
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*/
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protected function drawDisc($cy, $colorArray, $mode) {
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// Get graphical obects
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$img = $this->plot->getImg();
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$i = 0;
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$oldAngle = 0;
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$percentTotal = 0;
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foreach ($this->percent as $a) {
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list ($percent, $point) = $a;
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// If value is null, don't draw this arc
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if ($percent <= 0) {
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continue;
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}
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$color = $colorArray[$i % count($colorArray)];
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$percentTotal += $percent;
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$newAngle = $percentTotal * 360 / 100;
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// imagefilledarc doesn't like null values (#1)
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if ($newAngle - $oldAngle >= 1) {
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imagefilledarc($img, $this->pieCenterX, $cy, $this->pieWidth, $this->pieHeight, $oldAngle, $newAngle, $color->getColor($img), $mode);
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}
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$oldAngle = $newAngle;
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$i++;
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}
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}
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/**
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* Print the percentage text.
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*/
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protected function drawPercent() {
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// Get graphical obects
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$img = $this->plot->getImg();
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$palette = $this->plot->getPalette();
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$text = $this->plot->getText();
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$primitive = $this->plot->getPrimitive();
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$angle1 = 0;
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$percentTotal = 0;
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foreach ($this->percent as $a) {
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list ($percent, $point) = $a;
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// If value is null, the arc isn't drawn, no need to display percent
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if ($percent <= 0) {
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continue;
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}
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$percentTotal += $percent;
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$angle2 = $percentTotal * 2 * M_PI / 100;
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$angle = $angle1 + ($angle2 - $angle1) / 2;
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$label = number_format($percent) . "%";
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$x = cos($angle) * ($this->pieWidth + 35) / 2 + $this->pieCenterX;
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$y = sin($angle) * ($this->pieHeight + 35) / 2 + $this->pieCenterY;
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$text->printText($img, $x, $y, $this->plot->getTextColor(), $label, $text->fontCondensed, $text->HORIZONTAL_CENTER_ALIGN | $text->VERTICAL_CENTER_ALIGN);
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$angle1 = $angle2;
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}
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}
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/**
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* Print the pie chart.
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*/
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protected function printPie() {
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// Get graphical obects
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$img = $this->plot->getImg();
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$palette = $this->plot->getPalette();
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$text = $this->plot->getText();
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$primitive = $this->plot->getPrimitive();
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// Get the pie color set
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$pieColorSet = $palette->pieColorSet;
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$pieColorSet->reset();
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// Silhouette
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for ($cy = $this->pieCenterY + $this->pieDepth / 2; $cy >= $this->pieCenterY - $this->pieDepth / 2; $cy--) {
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$this->drawDisc($cy, $palette->pieColorSet->shadowColorList, IMG_ARC_EDGED);
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}
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// Top
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$this->drawDisc($this->pieCenterY - $this->pieDepth / 2, $palette->pieColorSet->colorList, IMG_ARC_PIE);
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// Top Outline
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$this->drawPercent();
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}
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/**
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* Render the chart image.
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*
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* @param string name of the file to render the image to (optional)
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*/
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public function render($fileName = null) {
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$this->computePercent();
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$this->computeLayout();
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$this->createImage();
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$this->plot->printLogo();
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$this->plot->printTitle();
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$this->printPie();
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$this->printCaption();
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$this->plot->render($fileName);
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}
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}
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?>
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