application/vendor/mfchart/PieChart.php

   1 <?php
   2
   3 // only 3d for now
   4
   5 class PieChart extends Chart {
   6
   7         protected $legend_precision = 1; // percentage round
   8
   9         protected $spacing = 2; // spacing between slices
  10
  11
  12         public function __construct($width=NULL, $height=NULL)
  13         {
  14                 $width = 300;
  15                 $height = 235;
  16                 parent::__construct($width, $height);
  17
  18                 $this->set_margins(0);
  19
  20                 $this->colors['colors'] = array(        // for drawing "value lines"
  21                                 array('#f8d01b', NULL, NULL),
  22                                 array('#f1b71e', NULL, NULL),
  23                                 array('#e38a23', NULL, NULL),
  24                                 array('#d65728', NULL, NULL),
  25                                 array('#ca1d2f', NULL, NULL),
  26                                 array('#c8004d', NULL, NULL),
  27                                 array('#db006f', NULL, NULL),
  28                                 array('#ef008f', NULL, NULL),
  29                                 array('#f7009a', NULL, NULL)
  30                         );
  31                 $this->colors['legend_color'] =                 array('#fefefe', NULL, NULL); // background legend color
  32         }
  33
  34         public function set_legend_precision($value)
  35         {
  36                 $this->legend_precision = (int) $value;
  37         }
  38
  39         public function draw()
  40         {
  41                 parent::draw();
  42
  43                 foreach ($this->values as $i => $value)
  44                         if ($value < 0)
  45                                 $this->values[$i] = 0;
  46
  47                 $plot_sizes = $this->get_plot_area();   // size of the graph area
  48                 $max_diameter = $plot_sizes[1]; // height of the plot area
  49
  50                 // get size of the percentage legend
  51                 $t = '100'. ($this->legend_precision ? '.'. str_repeat('0', $this->legend_precision) : '');
  52                 $box_points = imagettfbbox($this->font_size, 0, $this->font, $t);
  53                 $legend_slice_width = $box_points[4]-$box_points[6];
  54                 $legend_slice_height = $box_points[3]-$box_points[5];
  55
  56                 $width = $max_diameter-$this->spacing;
  57                 $height = $max_diameter*0.6;
  58                 $height_3d = $max_diameter*0.1;
  59
  60                 $this->legend = array_keys($this->values); // set legend
  61
  62                 // try to determine width of the legend box (exact width depends on relative font size which could be set when calling $this->draw_legend and margins)
  63                 $legend_width = 0;
  64                 foreach ($this->legend as $l)
  65                 {
  66                         $box_points = imagettfbbox($this->font_size, 0, $this->font, $l);
  67                         $legend_width = $box_points[4]-$box_points[6];
  68                         if ($legend_width < $width)
  69                                 $legend_width = $width;
  70
  71                 }
  72                 $legend_width += 0; // some margins
  73
  74                 $margin_left = ($this->width-$width+35) / 2;
  75                 $center_x = $width/2+$margin_left;
  76                 $center_y = $this->margin_top + ($height+$height_3d)/2;
  77
  78                 $ratio = array_sum($this->values)/360;
  79
  80                 if ($ratio != 0)        // so there is something to display
  81                 {
  82
  83                         // steps for gradient in 3d
  84                         $step = 2;
  85                         $substep = 2;
  86
  87                         $start = 300;
  88                         $slices = array();
  89                         $i = 0;
  90                         foreach ($this->values as $key => $value)
  91                         {
  92                                 // make the color for 3d darker
  93                                 $hexcolor = $this->get_color('colors', $i, 0);
  94                                 if( $hexcolor !== false ) {
  95                                         $colortop = utilities::hex2rgb($hexcolor);
  96                                         $colorbottom[0] = $colortop[0]-40 < 0 ? 0 : $colortop[0]-40;
  97                                         $colorbottom[1] = $colortop[1]-40 < 0 ? 0 : $colortop[1]-40;
  98                                         $colorbottom[2] = $colortop[2]-40 < 0 ? 0 : $colortop[2]-40;
  99
 100                                         $arc = $value/$ratio;
 101                                         $slices[] = array($start, $start+$arc, $colorbottom, $substep, $colortop, round($arc/3.6, $this->legend_precision));
 102                                         $start += $arc;
 103                                 }
 104                                 $i++;
 105                         }
 106
 107                         // make the 3D effect
 108                         for ($j=$height_3d; $j>0; $j--)
 109                         {
 110                                 foreach ($slices as $i => $slice)
 111                                 {
 112                                         if (round($slice[0]) == round ($slice[1]))
 113                                                 continue;
 114
 115                                         $center_x_spaced = $center_x;
 116                                         $center_y_spaced = $center_y;
 117                                         if ($this->spacing)
 118                                         {
 119                                                 $arc_half = $slice[0] + ($slice[1]-$slice[0])/2;
 120                                                 $cos = cos(utilities::deg2rad($arc_half));
 121                                                 $sin = sin(utilities::deg2rad($arc_half));
 122                                                 $center_x_spaced = $center_x_spaced + $cos*$this->spacing;
 123                                                 $center_y_spaced = $center_y_spaced - $sin*$this->spacing;
 124                                         }
 125
 126                                         $color = $slice[2];
 127                                         $color[] = 0;
 128                                         imageSmoothArc($this->image, $center_x_spaced, $center_y_spaced+$j, $width, $height, $color, utilities::deg2rad($slice[0]), utilities::deg2rad($slice[1]));
 129
 130                                         // try to determine next color for gradient
 131                                         if ($j % $step == 0)
 132                                   {
 133                                                 if ($slice[2][0] != 255)
 134                                                         $slices[$i][2][0] = ($slice[2][0]+$slice[3] > 255) ? 255 : $slice[2][0]+$slice[3];
 135                                                 else
 136                                                         $slices[$i][3] += 1;
 137
 138                                                 if ($slice[2][1] != 255)
 139                                                         $slices[$i][2][1] = ($slice[2][1]+$slice[3] > 255) ? 255 : $slice[2][1]+$slice[3];
 140                                                 else
 141                                                         $slices[$i][3] += 1;
 142
 143                                                 if ($slice[2][2] != 255)
 144                                                         $slices[$i][2][2] = ($slice[2][2]+$slice[3] > 255) ? 255 : $slice[2][2]+$slice[3];
 145                                                 else
 146                                                         $slices[$i][3] += 1;
 147                 }
 148                                 }
 149                         }
 150
 151                         foreach ($slices as $slice)
 152                         {
 153                                 if (round($slice[0]) == round ($slice[1]))
 154                                         continue;
 155
 156                                 $arc_half = ($slice[0] + ($slice[1]-$slice[0])/2) % 360;
 157                                 $cos = cos(utilities::deg2rad($arc_half));
 158                                 $sin = sin(utilities::deg2rad($arc_half));
 159
 160                                 $center_x_spaced = $center_x;
 161                                 $center_y_spaced = $center_y;
 162                                 if ($this->spacing)
 163                                 {
 164                                         $center_x_spaced = $center_x_spaced + $cos*$this->spacing;
 165                                         $center_y_spaced = $center_y_spaced - $sin*$this->spacing;
 166                                 }
 167
 168                                 // draw the top
 169
 170                                 $color = $slice[4];
 171                                 $color[] = 0;
 172
 173                                 imageSmoothArc($this->image, $center_x_spaced, $center_y_spaced, $width, $height, $color, utilities::deg2rad($slice[0]), utilities::deg2rad($slice[1]));
 174
 175
 176                                 $a = $width/2;
 177                                 $b = $height/2;
 178
 179                                 // radius of an ellipse
 180                                 $r = $a*$b / sqrt(pow($b,2)*pow($cos,2) + pow($a,2)*pow($sin,2));
 181                                 $r += 15; // padding from the graph
 182
 183                                 $legend_slice_x = $center_x_spaced + $cos*$r;
 184                                 $legend_slice_y = (($arc_half > 180 AND $arc_half < 360) ? $center_y_spaced+$height_3d : $center_y_spaced) - $sin*$r;
 185
 186                                 $text = $slice[5].'%';
 187
 188                                 $box_points = imagettfbbox($this->font_size, 0, $this->font, $text);
 189                                 $legend_slice_width = $box_points[4]-$box_points[6];
 190                                 $legend_slice_hheight = ($box_points[3]-$box_points[5]) / 2;
 191
 192                                 if (($arc_half >= 0 AND $arc_half < 90) OR ($arc_half >= 270 AND $arc_half < 360))
 193                                 {
 194                                         $legend_slice_x1 = $legend_slice_x+$legend_slice_hheight;
 195                                         $legend_slice_y1 = $legend_slice_y-$legend_slice_hheight;
 196                                         $legend_slice_x2 = $legend_slice_x+$legend_slice_width+$legend_slice_hheight;
 197                                         $legend_slice_y2 = $legend_slice_y+$legend_slice_hheight+5;
 198                                 }
 199                                 elseif (($arc_half >= 90 AND $arc_half < 180) OR ($arc_half >= 180 AND $arc_half < 270))
 200                                 {
 201                                         $legend_slice_x1 = $legend_slice_x-$legend_slice_width-$legend_slice_hheight;
 202                                         $legend_slice_y1 = $legend_slice_y-$legend_slice_hheight;
 203                                         $legend_slice_x2 = $legend_slice_x-$legend_slice_hheight;
 204                                         $legend_slice_y2 = $legend_slice_y+$legend_slice_hheight+5;
 205                                 }
 206
 207                                 # print percent value
 208                                 utilities::imagestringbox($this->image, $this->font, $this->font_size, $legend_slice_x1, $legend_slice_y1, $legend_slice_x2, $legend_slice_y2, ALIGN_CENTER, VALIGN_MIDDLE, 0, $text, $this->get_color('font_color'));
 209
 210                         }
 211                 }
 212
 213                 # print legend
 214                 //$this->draw_legend('colors', 0, $center_x+$width/2-20+$legend_slice_width*3, $this->height/2-$height/2);
 215                 $this->draw_legend('colors', 0, 20, $this->height/2+62);
 216
 217         }
 218
 219 }