<?php

  require_once dirname(__FILE__) . "/class.graph.php";

  class PieGraph extends CGraph {

    var $pie_color = array(array(39, 78, 120));

    var $pie_deepnesscolor = array(array(9, 48, 90));

    var $pie_bgcolor = array(array(69, 129, 194));

    var $pie_deepness = 10;

    var $pie_total = 0;

    var $pie_startoffset = 0;

    function Graph() {

      $this->graph_width = $this->graph_padding['left'] + $this->graph_areawidth + $this->graph_padding['right'];

      $this->graph_height = $this->graph_padding['top'] + $this->graph_areaheight + $this->graph_padding['bottom'];

    }

    function SetPieColor($red, $green, $blue) {

      $this->pie_color = array($red, $green, $blue);

    }

    function AddPieColor($red, $green, $blue) {

      if (!is_array($this->pie_color[0])) {

        $this->pie_color = array($this->pie_color);

      }

      $this->pie_color[] = array($red, $green, $blue);

    }

    function SetPieBackgroundColor($red, $green, $blue) {

      $this->pie_bgcolor = array($red, $green, $blue);

    }

    function AddPieBackgroundColor($red, $green, $blue) {

      if (!is_array($this->pie_bgcolor[0])) {

        $this->pie_bgcolor = array($this->pie_bgcolor);

      }

      $this->pie_bgcolor[] = array($red, $green, $blue);

    }

    function SetPieDeepnessColor($red, $green, $blue) {

      $this->pie_deepnesscolor = array($red, $green, $blue);

    }

    function AddPieDeepnessColor($red, $green, $blue) {

      if (!is_array($this->pie_deepnesscolor[0])) {

        $this->pie_deepnesscolor = array($this->pie_deepnesscolor);

      }

      $this->pie_deepnesscolor[] = array($red, $green, $blue);

    }

    function SetPieTotalValue($total) {

      $this->pie_total = $total;

    }

    function SetPieStartOffset($offset) {

      if ($offset < 0 || $offset > 359) $offset = 0;

      $this->pie_startoffset = $offset;

    }

    function SetPieData($data) {

      CGraph::SetData($data);

    }

    function DrawGraph($file = "") {

      $this->im = imagecreatetruecolor($this->graph_width, $this->graph_height);

      $this->axis_positions = array(0, 0, 0, 0);

      $this->axis_xscalevisible = 0;

      $this->axis_yscalevisible = 0;

      $this->axis_gridlines = 0;

      CGraph::DrawGraph();

      if ($this->pie_total == 0) {

        foreach ($this->data as $name => $value) {

          $this->pie_total += $value;

        }

      }

      // deepness

      for ($i = $this->pie_deepness; $i > 0; $i--) {

        $offset = 0;

        $p = 0;

        foreach ($this->data as $n => $value) {

          if (!$this->pie_deepnesscolor[$p]) {

            $this->__AllocateColor("im_pie_deepnesscolor", $this->pie_deepnesscolor[$p], 0, $p);

          }

          $from = round($this->pie_startoffset - ($offset * 360 / $this->pie_total));

          $to = round($this->pie_startoffset - (($value + $offset) * 360 / $this->pie_total));

          if ($from < 0) $from += 360;

          if ($to < 0) $to += 360;

          imagefilledarc($this->im, round($this->graph_width / 2), round($this->graph_height / 2) + $i,

                                    $this->graph_areawidth, $this->graph_areaheight,

                                    $to, $from, $this->pie_deepnesscolor[$p], IMG_ARC_PIE);

          $offset += $value;

          $p++;

        }

      }

      $offset = 0;

      $p = 0;

      foreach ($this->data as $n => $value) {

        $this->__AllocateColor("im_pie_color", $this->pie_color[$p], 0, $p);

        $from = round($this->pie_startoffset - ($offset * 360 / $this->pie_total));

        $to = round($this->pie_startoffset - (($value + $offset) * 360 / $this->pie_total));

        if ($from < 0) $from += 360;

        if ($to < 0) $to += 360;

        imagefilledarc($this->im, round($this->graph_width / 2), round($this->graph_height / 2),

                                  $this->graph_areawidth, $this->graph_areaheight,

                                  $to, $from, $this->im_pie_color[$p], IMG_ARC_PIE);

        $offset += $value;

        $p++;

      }

      CGraph::DrawGraph2();

      if (strlen($file)) {

        $ret = imagepng($this->im, $file);

      } else {

        header("Content-Type: image/png"); // thanks to Marcin G. :)

        imagepng($this->im);

        $ret = true;

      }

      imagedestroy($this->im);

      return $ret;

    }

    function __DrawPieSlice($frompercent, $topercent, $color, $deepcolor) {

      $from = round(270 - ($frompercent * 3.6));

      $to = round(270 - ($topercent * 3.6));

      if ($from < 0) $from += 360;

      if ($to < 0) $to += 360;

      //echo "FROM:" . $from . " TO:" . $to . "<br>\n";

      for ($i = $this->pie_deepness; $i > 0; $i--) {

        imagefilledarc($this->im, round($this->graph_width / 2), round($this->graph_height / 2) + $i,

                                  round($this->graph_areawidth / 2), round($this->graph_areaheight / 2),

                                  $to, $from, $deepcolor, IMG_ARC_PIE);

      }

      imagefilledarc($this->im, round($this->graph_width / 2), round($this->graph_height / 2),

                                round($this->graph_areawidth / 2), round($this->graph_areaheight / 2),

                                $to, $from, $color, IMG_ARC_PIE);

    }

    /**

     * Graph::__LoadPieValues()

     * Loads definitions to pie settings

     **/

    function __LoadPieValues($data) {

      foreach ($data as $name => $value) {

        $name = strtolower($name);

        switch ($name) {

          case 'background-color':

            $this->__SetColorToValue("pie_bgcolor", $value);

            break;

          case 'color':

            $this->__SetColorToValue("pie_color", $value);

            break;

          case 'deepness-color':

            $this->__SetColorToValue("pie_depnesscolor", $value);

            break;

          case 'offset':

            $this->SetPieStartOffset($value);

            break;

          case 'total':

            $this->SetPieTotalValue($value);

        }

      }

    }

  }

?>