include/libs/svgplot/lib.svgpie.php

   1 <?php
   2
   3 class SVGPie
   4 {
   5         protected $width = null;
   6         protected $height = null;
   7         protected $data = array();
   8         protected $title = null;
   9         protected $legend = true;
  10
  11         public function __construct($width = 600, $height = 400)
  12         {
  13                 $this->width = (int) $width;
  14                 $this->height = (int) $height;
  15         }
  16
  17         public function add(SVGPie_Data $data)
  18         {
  19                 $this->data[] = $data;
  20                 return true;
  21         }
  22
  23         public function setTitle($title)
  24         {
  25                 $this->title = $title;
  26                 return true;
  27         }
  28
  29         public function toggleLegend()
  30         {
  31                 $this->legend = !$this->legend;
  32         }
  33
  34         public function display()
  35         {
  36                 header('Content-Type: image/svg+xml');
  37                 echo $this->output();
  38         }
  39
  40         public function output()
  41         {
  42                 $out = '<?xml version="1.0" encoding="utf-8" standalone="no"?>' . PHP_EOL;
  43                 $out.= '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/SVG/DTD/svg10.dtd">' . PHP_EOL;
  44                 $out.= '<svg width="'.$this->width.'" height="'.$this->height.'" viewBox="0 0 '.$this->width.' '.$this->height.'" xmlns="http://www.w3.org/2000/svg" version="1.1">' . PHP_EOL;
  45
  46                 $circle_size = min($this->width, $this->height);
  47                 $cx = $circle_size / 2;
  48                 $cy = $this->height / 2;
  49                 $circle_size *= 0.98;
  50                 $radius = $circle_size / 2;
  51
  52                 if (count($this->data) == 1)
  53                 {
  54                         $row = current($this->data);
  55                         $out .= "<circle cx=\"{$cx}\" cy=\"{$cy}\" r=\"{$radius}\" fill=\"{$row->fill}\" "
  56                                 .       "stroke=\"white\" stroke-width=\"".($circle_size * 0.005)."\" stroke-linecap=\"round\" "
  57                                 .       "stroke-linejoin=\"round\" />";
  58                 }
  59                 else
  60                 {
  61                         $sum = 0;
  62                         $start_angle = 0;
  63                         $end_angle = 0;
  64
  65                         foreach ($this->data as $row)
  66                         {
  67                                 $sum += $row->data;
  68                         }
  69
  70                         foreach ($this->data as $row)
  71                         {
  72                                 $row->angle = ceil(360 * $row->data / $sum);
  73
  74                     $start_angle = $end_angle;
  75                     $end_angle = $start_angle + $row->angle;
  76
  77                                 $x1 = $cx + $radius * cos(deg2rad($start_angle));
  78                                 $y1 = $cy + $radius * sin(deg2rad($start_angle));
  79
  80                                 $x2 = $cx + $radius * cos(deg2rad($end_angle));
  81                                 $y2 = $cy + $radius * sin(deg2rad($end_angle));
  82
  83                                 $arc = $row->angle > 180 ? 1 : 0;
  84
  85                                 $out .= "<path d=\"M{$cx},{$cy} L{$x1},{$y1} A{$radius},{$radius} 0 {$arc},1 {$x2},{$y2} Z\"
  86                                         fill=\"{$row->fill}\" stroke=\"white\" stroke-width=\"".($circle_size * 0.005)."\" stroke-linecap=\"round\"
  87                                         stroke-linejoin=\"round\" />";
  88                         }
  89                 }
  90
  91                 if ($this->title)
  92                 {
  93                         $out .= '<text x="'.($this->width * 0.98).'" y="'.($this->height * 0.07).'" font-size="'.($this->height * 0.05).'" fill="white" '
  94                                 .       'stroke="white" stroke-width="'.($this->height * 0.01).'" stroke-linejoin="round" stroke-linecap="round" '
  95                                 .       'text-anchor="end" style="font-family: Verdana, Arial, sans-serif; font-weight: bold;">'.$this->title.'</text>' . PHP_EOL;
  96                         $out .= '<text x="'.($this->width * 0.98).'" y="'.($this->height * 0.07).'" font-size="'.($this->height * 0.05).'" fill="black" '
  97                                 .       'text-anchor="end" style="font-family: Verdana, Arial, sans-serif; font-weight: bold;">'.$this->title.'</text>' . PHP_EOL;
  98                 }
  99
 100                 if ($this->legend)
 101                 {
 102                         $x = $this->width - ($this->width * 0.06);
 103                         $y = $this->height * 0.1;
 104
 105                         foreach ($this->data as $row)
 106                         {
 107                                 $out .= '<rect x="'.$x.'" y="'.($y - $this->height * 0.01).'" width="'.($this->width * 0.04).'" height="'.($this->height * 0.04).'" fill="'.$row->fill.'" stroke="black" stroke-width="1" rx="2" />' . PHP_EOL;
 108
 109                                 if ($row->label)
 110                                 {
 111                                         $out .= '<text x="'.($x-($this->width * 0.02)).'" y="'.($y+($this->height * 0.025)).'" '
 112                                                 .       'font-size="'.($this->height * 0.05).'" fill="white" stroke="white" '
 113                                                 .       'stroke-width="'.($this->height * 0.01).'" stroke-linejoin="round" '
 114                                                 .       'stroke-linecap="round" text-anchor="end" style="font-family: Verdana, '
 115                                                 .       'Arial, sans-serif;">'.$row->label.'</text>' . PHP_EOL;
 116                                         $out .= '<text x="'.($x-($this->width * 0.02)).'" y="'.($y+($this->height * 0.025)).'" '
 117                                                 .       'font-size="'.($this->height * 0.05).'" fill="black" text-anchor="end" '
 118                                                 .       'style="font-family: Verdana, Arial, sans-serif;">'.$row->label.'</text>' . PHP_EOL;
 119                                 }
 120
 121                                 $y += ($this->height * 0.05);
 122                         }
 123                 }
 124
 125                 $out .= '</svg>';
 126                 return $out;
 127         }
 128 }
 129
 130 class SVGPie_Data
 131 {
 132         public $fill = 'blue';
 133         public $data = 0.0;
 134         public $label = null;
 135
 136         public function __construct($data, $label = null, $fill = 'blue')
 137         {
 138                 $this->data = $data;
 139                 $this->fill = $fill;
 140                 $this->label = $label;
 141         }
 142 }
 143
 144 ?>