include/libs/svgplot/lib.svgplot.php

   1 <?php
   2
   3 class SVGPlot
   4 {
   5         protected $width = null;
   6         protected $height = null;
   7         protected $data = array();
   8         protected $title = null;
   9         protected $labels = array();
  10         protected $legend = true;
  11
  12         public function __construct($width = 600, $height = 400)
  13         {
  14                 $this->width = (int) $width;
  15                 $this->height = (int) $height;
  16         }
  17
  18         public function setTitle($title)
  19         {
  20                 $this->title = $title;
  21                 return true;
  22         }
  23
  24         public function toggleLegend()
  25         {
  26                 $this->legend = !$this->legend;
  27         }
  28
  29         public function setLabels($labels)
  30         {
  31                 $this->labels = $labels;
  32                 return true;
  33         }
  34
  35         public function add(SVGPlot_Data $data)
  36         {
  37                 $this->data[] = $data;
  38                 return true;
  39         }
  40
  41         public function display()
  42         {
  43                 header('Content-Type: image/svg+xml');
  44                 echo $this->output();
  45         }
  46
  47         public function output()
  48         {
  49                 $out = '<?xml version="1.0" encoding="utf-8" standalone="no"?>' . PHP_EOL;
  50                 $out.= '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/SVG/DTD/svg10.dtd">' . PHP_EOL;
  51                 $out.= '<svg width="'.$this->width.'" height="'.$this->height.'" viewBox="0 0 '.$this->width.' '.$this->height.'" xmlns="http://www.w3.org/2000/svg" version="1.1">' . PHP_EOL;
  52
  53                 if ($this->title)
  54                 {
  55                         $out .= '<text x="'.round($this->width/2).'" y="'.($this->height * 0.07).'" font-size="'.($this->height * 0.05).'" fill="white" '
  56                                 .       'stroke="white" stroke-width="'.($this->height * 0.01).'" stroke-linejoin="round" stroke-linecap="round" '
  57                                 .       'text-anchor="middle" style="font-family: Verdana, Arial, sans-serif; font-weight: bold;">'.$this->title.'</text>' . PHP_EOL;
  58                         $out .= '<text x="'.round($this->width/2).'" y="'.($this->height * 0.07).'" font-size="'.($this->height * 0.05).'" fill="black" '
  59                                 .       'text-anchor="middle" style="font-family: Verdana, Arial, sans-serif; font-weight: bold;">'.$this->title.'</text>' . PHP_EOL;
  60                 }
  61
  62                 $out .= $this->_renderLinegraph();
  63
  64                 if ($this->legend)
  65                 {
  66                         $x = $this->width - ($this->width * 0.06);
  67                         $y = $this->height * 0.1;
  68
  69                         foreach ($this->data as $row)
  70                         {
  71                                 $out .= '<rect x="'.$x.'" y="'.($y - $this->height * 0.01).'" width="'.($this->width * 0.04).'" height="'.($this->height * 0.04).'" fill="'.$row->color.'" stroke="black" stroke-width="1" rx="2" />' . PHP_EOL;
  72
  73                                 if ($row->title)
  74                                 {
  75                                         $out .= '<text x="'.($x-($this->width * 0.02)).'" y="'.($y+($this->height * 0.025)).'" '
  76                                                 .       'font-size="'.($this->height * 0.05).'" fill="white" stroke="white" '
  77                                                 .       'stroke-width="'.($this->height * 0.01).'" stroke-linejoin="round" '
  78                                                 .       'stroke-linecap="round" text-anchor="end" style="font-family: Verdana, Arial, '
  79                                                 .       'sans-serif;">'.$row->title.'</text>' . PHP_EOL;
  80                                         $out .= '<text x="'.($x-($this->width * 0.02)).'" y="'.($y+($this->height * 0.025)).'" '
  81                                                 .       'font-size="'.($this->height * 0.05).'" fill="black" text-anchor="end" '
  82                                                 .       'style="font-family: Verdana, Arial, sans-serif;">'.$row->title.'</text>' . PHP_EOL;
  83                                 }
  84
  85                                 $y += ($this->height * 0.07);
  86                         }
  87                 }
  88
  89                 $out .= '</svg>';
  90
  91                 return $out;
  92         }
  93
  94         protected function _renderLinegraph()
  95         {
  96                 $out = '';
  97
  98                 if (empty($this->data))
  99                 {
 100                         return $out;
 101                 }
 102
 103                 // Figure out the maximum Y-axis value
 104                 $max_value = 0;
 105                 $nb_elements = 0;
 106
 107                 foreach ($this->data as $row)
 108                 {
 109                         if ($max_value == 0)
 110                         {
 111                                 $nb_elements = count($row->get());
 112                         }
 113
 114                         $max = max($row->get());
 115
 116                         if ($max > $max_value)
 117                         {
 118                                 $max_value = $max;
 119                         }
 120                 }
 121
 122                 if ($nb_elements < 1)
 123                 {
 124                         return $out;
 125                 }
 126
 127                 $divide = round($max_value / ($this->height * 0.8), 2) ?: 1;
 128                 $y_axis_val = ceil(abs($max_value) / ($this->height * 0.8)) * 50;
 129                 $space = round(($this->width - ($this->width * 0.1)) / $nb_elements, 2);
 130
 131                 for ($i = 0; $i < 10; $i++)
 132                 {
 133                         if (($y_axis_val * $i) <= $max_value)
 134                         {
 135                                 $line_y = ($this->height * 0.93) - (($y_axis_val / $divide) * $i);
 136                                 $out .= '<line x1="'.($this->width * 0.1).'" y1="'.($line_y).'" x2="'.$this->width.'" y2="'.($line_y).'" stroke-width="1" stroke="#ccc" />' . PHP_EOL;
 137                                 $out .= '<g><text x="'.($this->width * 0.08).'" y="'.($line_y).'" font-size="'.($this->height * 0.04).'" fill="gray" text-anchor="end" style="font-family: Verdana, Arial, sans-serif;">'.($y_axis_val * $i).'</text></g>' . PHP_EOL;
 138                         }
 139                 }
 140
 141                 // X-axis lines
 142                 $y = $this->height - ($this->height * 0.07);
 143                 $x = $this->width * 0.1;
 144                 $i = 0;
 145
 146                 foreach ($this->data[0]->get() as $k=>$v)
 147                 {
 148                         if ($x >= $this->width)
 149                                 break;
 150
 151                         $out .= '<line x1="'.$x.'" y1="'.($y).'" x2="'.$x.'" y2="'.($this->height * 0.1).'" stroke-width="1" stroke="#ccc" />' . PHP_EOL;
 152                         $x += $space + $this->data[0]->width;
 153                 }
 154
 155                 // labels for x axis
 156                 $y = $this->height - ($this->height * 0.07);
 157                 $i = 0;
 158                 $step = round($nb_elements / 5);
 159
 160                 for ($i = 0; $i <= $nb_elements; $i += $step)
 161                 {
 162                         //echo
 163                         $x = ($i * ($space + $this->data[0]->width)) + ($this->width * 0.1);
 164
 165                         if ($x >= $this->width)
 166                                 break;
 167
 168                         if (isset($this->labels[$i]))
 169                         {
 170                                 $out .= '<g><text x="'.$x.'" y="'.($y+($this->height * 0.06)).'" '
 171                                         .       'font-size="'.($this->height * 0.04).'" fill="gray" text-anchor="middle" '
 172                                         .       'style="font-family: Verdana, Arial, sans-serif;">'
 173                                         .       ($this->labels[$i]).'</text></g>' . PHP_EOL;
 174                         }
 175                 }
 176
 177                 $y = ($this->height * 0.1);
 178                 $w = $this->width - ($this->width * 0.1);
 179                 $h = $this->height - ($this->height * 0.17);
 180
 181                 foreach ($this->data as $row)
 182                 {
 183                         $out .= '<polyline fill="none" stroke="'.$row->color.'" stroke-width="'.$row->width.'" '
 184                                 .'stroke-linecap="round" points="';
 185
 186                         $x = ($this->width * 0.1);
 187
 188                         foreach ($row->get() as $k=>$v)
 189                         {
 190                                 $_y = $y + ($h - round($v / $divide, 2)) + round($row->width / 2);
 191                                 $out.= $x.','.$_y.' ';
 192                                 $x += $space + $row->width;
 193                         }
 194
 195                         $out .= '" />' . PHP_EOL;
 196                 }
 197
 198                 return $out;
 199         }
 200 }
 201
 202 class SVGPlot_Data
 203 {
 204         public $color = 'blue';
 205         public $width = '10';
 206         public $title = null;
 207         protected $data = array();
 208
 209         public function __construct($data)
 210         {
 211                 if (is_array($data))
 212                         $this->data = $data;
 213                 elseif (!is_object($data))
 214                         $this->append($data);
 215         }
 216
 217         public function append($data)
 218         {
 219                 $this->data[] = $data;
 220                 return true;
 221         }
 222
 223         public function get()
 224         {
 225                 return $this->data;
 226         }
 227 }
 228
 229 ?>