GraphPie.php

   1 <?php
   2 /*=====================================================================*\
   3 || ###################################################################
   4 || # Blue Static ISSO Framework
   5 || # Copyright ©2002-[#]year[#] Blue Static
   6 || #
   7 || # This program is free software; you can redistribute it and/or modify
   8 || # it under the terms of the GNU General Public License as published by
   9 || # the Free Software Foundation; version [#]gpl[#] of the License.
  10 || #
  11 || # This program is distributed in the hope that it will be useful, but
  12 || # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13 || # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  14 || # more details.
  15 || #
  16 || # You should have received a copy of the GNU General Public License along
  17 || # with this program; if not, write to the Free Software Foundation, Inc.,
  18 || # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  19 || ###################################################################
  20 \*=====================================================================*/
  21
  22 /**
  23 * Graphing System: Pie Chart (GraphPie.php)
  24 *
  25 * @package      ISSO
  26 */
  27
  28 require_once('ISSO/Graph.php');
  29
  30 /**
  31 * Graphing System: Pie Chart
  32 *
  33 * This framework creates pie charts as PNG image strings. Simply add to
  34 * the data set and graph to get the byte stream returned.
  35 *
  36 * @author               Blue Static
  37 * @copyright    Copyright (c)2002 - [#]year[#], Blue Static
  38 * @version              $Revision$
  39 * @package              ISSO
  40 *
  41 */
  42 class BSGraphPie extends BSGraph
  43 {
  44         /**
  45         * Graphing data set; 2D array of
  46         * array(NAME, PERCENT, COLOR)
  47         * @var  array
  48         */
  49         protected $dataset = array();
  50
  51         // ###################################################################
  52         /**
  53         * Graphs the actual graph and returns a byte stream
  54         *
  55         * @return       string  Byte stream
  56         */
  57         public function graph()
  58         {
  59                 $colors['black'] = imagecolorallocate($this->image, 0, 0, 0);
  60                 $colors['white'] = imagecolorallocate($this->image, 255, 255, 255);
  61                 $colors['grey'] = imagecolorallocate($this->image, 121, 121, 123);
  62
  63                 $graphpadding = 10;
  64                 $graphspacing = 4;
  65                 $diameter = $this->dimensions['height'] - (5 * $graphpadding);
  66                 $radius = $diameter / 2;
  67                 $graphstart = $graphpadding + imagefontheight(5) + $graphpadding;
  68                 $legendbox = 10;
  69
  70                 // fill background
  71                 imagefill($this->image, 0, 0, $colors['white']);
  72
  73                 // title the chart
  74                 imagestring($this->image, 5, ($this->dimensions['width'] - (imagefontwidth(5) * strlen($this->title))) / 2, $graphpadding, $this->title, $colors['black']);
  75
  76                 $center = array(
  77                         'x' => ($this->legend ? ($radius + $graphpadding) : ($this->dimensions['width'] / 2)),
  78                         'y' => ($this->dimensions['height'] / 2) + $graphpadding
  79                 );
  80
  81                 // draw a border
  82                 imageline($this->image, 0, 0, 0, $this->dimensions['height'], $colors['black']); // left
  83                 imageline($this->image, 0, $this->dimensions['height'] - 1, $this->dimensions['width'], $this->dimensions['height'] - 1, $colors['black']); // bottom
  84                 imageline($this->image, $this->dimensions['width'] - 1, 0, $this->dimensions['width'] - 1, $this->dimensions['height'], $colors['black']); // right
  85                 imageline($this->image, 0, 0, $this->dimensions['width'], 0, $colors['black']); // top
  86
  87                 $legx = (2 * $graphpadding) + $diameter;
  88
  89                 $lastdeg = 0;
  90                 $boxoffset = 0;
  91                 foreach ($this->dataset AS $plot)
  92                 {
  93                         $deg = (360 / 100) * $plot[1];
  94                         imagefilledarc($this->image, $center['x'], $center['y'], $diameter, $diameter, $lastdeg, $deg + $lastdeg, $plot[2], IMG_ARC_PIE);
  95                         imagefilledarc($this->image, $center['x'], $center['y'], $diameter, $diameter, $lastdeg, $deg + $lastdeg, $colors['grey'], IMG_ARC_EDGED | IMG_ARC_NOFILL);
  96                         $lastdeg += $deg;
  97
  98                         if ($this->legend)
  99                         {
 100                                 $box = array(
 101                                         $legx + 1 + $graphspacing,                              $graphstart + 1 + $graphspacing + $boxoffset, // top left
 102                                         $legx + 1 + $graphspacing,                              $graphstart + 1 + $graphspacing + $boxoffset + $legendbox, // bottom left
 103                                         $legx + 1 + $graphspacing + $legendbox, $graphstart + 1 + $graphspacing + $boxoffset + $legendbox, // bottom right
 104                                         $legx + 1 + $graphspacing + $legendbox, $graphstart + 1 + $graphspacing + $boxoffset // top right
 105                                 );
 106                                 imagefilledpolygon($this->image, $box, 4, $plot[2]);
 107
 108                                 imagestring($this->image, 2, ($legx + 1 + $graphspacing + $legendbox + $graphspacing), ($graphstart + $graphspacing + $boxoffset), $plot[0] . " ($plot[1]%)", $colors['black']);
 109
 110                                 $boxoffset += $graphspacing + $legendbox;
 111                         }
 112                 }
 113
 114                 // draw the ellipse (do here so it cleans up the arc edges)
 115                 imageellipse($this->image, $center['x'], $center['y'], $diameter, $diameter, $colors['grey']);
 116
 117                 // do the legend
 118                 if ($this->legend)
 119                 {
 120                         imageline($this->image, $legx, $graphstart, $this->dimensions['width'] - $graphpadding, $graphstart, $colors['black']); // top
 121                         imageline($this->image, $legx, $graphstart, $legx, $legy = ($graphstart + $graphspacing + $boxoffset + 1), $colors['black']); // left
 122                         imageline($this->image, $legx, $legy, $this->dimensions['width'] - $graphpadding, $legy, $colors['black']); // bottom
 123                         imageline($this->image, $this->dimensions['width'] - $graphpadding, $graphstart, $this->dimensions['width'] - $graphpadding, $legy, $colors['black']); // right
 124                 }
 125
 126                 ob_start();
 127                 imagepng($this->image);
 128                 $data = ob_get_contents();
 129                 if ($data === false)
 130                 {
 131                         $data = ob_get_clean();
 132                 }
 133                 ob_clean();
 134                 ob_end_clean();
 135
 136                 return $data;
 137         }
 138
 139         // ###################################################################
 140         /**
 141         * Adds an entry to the data set without specifying a color to add.
 142         * This is the standard method as the color should only be overridden
 143         * if necessary.
 144         *
 145         * @param        string  Data column name
 146         * @param        integer Percentage of 100
 147         */
 148         public function addDataSet($name, $percent)
 149         {
 150                 $this->dataset[] = array($name, intval($percent), $this->_fetchColor());
 151         }
 152
 153         // ###################################################################
 154         /**
 155         * Adds an entry ot the data set with specifying a color. This works
 156         * the same as addDataSet() but requires an array() as the 3rd parameter
 157         * of R,G,B values
 158         *
 159         * @param        string  Data column name
 160         * @param        integer Percent of 100
 161         * @param        array   Array of R,G,B values
 162         */
 163         public function addDataSetColor($name, $percent, $color)
 164         {
 165                 $this->dataset[] = array($name, intval($percent), imagecolorallocate($this->image, $color[0], $color[1], $color[2]));
 166         }
 167 }
 168
 169 /*=====================================================================*\
 170 || ###################################################################
 171 || # $HeadURL$
 172 || # $Id$
 173 || ###################################################################
 174 \*=====================================================================*/
 175 ?>