--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphing/class.piegraph.php	Sun Jan 04 16:40:36 2009 -0500
@@ -0,0 +1,159 @@
+<?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);
+        }
+      }
+    }
+  }
+?>