--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphing/class.linegraph.php	Sun Jan 04 16:40:36 2009 -0500
@@ -0,0 +1,174 @@
+<?php
+  require_once dirname(__FILE__) . "/class.graph.php";
+
+  class LineGraph extends CGraph {
+    var $line_color = array(39, 78, 120);
+    var $line_bgcolor = array(69, 129, 194);
+
+    function LineGraph() {
+      $this->graph_width = $this->graph_padding['left'] + $this->graph_areawidth + $this->graph_padding['right'];
+      $this->graph_height = $this->graph_padding['top'] + $this->graph_areaheight + $this->graph_padding['bottom'];
+    }
+    
+    /**
+     * Graph::SetLineColor()
+     * Sets line color
+     **/
+    function SetLineColor($red, $green, $blue) {
+      $this->line_color = array($red, $green, $blue);
+    }
+
+    /**
+     * Graph::AddLineColor()
+     * Sets line color
+     **/
+    function AddLineColor($red, $green, $blue) {
+      if (!is_array($this->line_color[0])) {
+        $this->line_color = array($this->line_color);
+      }
+      $this->line_color[] = array($red, $green, $blue);
+    }
+
+    /**
+     * Graph::SetLineBackgroundColor()
+     * Sets background color for line (when 3D)
+     **/
+    function SetLineBackgroundColor($red, $green, $blue) {
+      $this->line_bgcolor = array($red, $green, $blue);
+    }
+    
+    /**
+     * Graph::AddLineBackgroundColor()
+     * Sets line background color
+     **/
+    function AddLineBackgroundColor($red, $green, $blue) {
+      if (!is_array($this->line_bgcolor[0])) {
+        $this->line_bgcolor = array($this->line_bgcolor);
+      }
+      $this->line_bgcolor[] = array($red, $green, $blue);
+    }
+    
+    /**
+     * Graph::DrawGraph()
+     * Draw all the graph: bg, axis, bars, text.. and output it
+     * Optional file parameter turns output to file, and bool on success
+     **/
+    function DrawGraph($file = "") {
+      $this->im = imagecreatetruecolor($this->graph_width, $this->graph_height);
+      
+      CGraph::DrawGraph();
+      
+      $this->__Draw_LeftBottom_Axis();
+      
+      $arrki = array_keys($this->data);
+      if (is_array($this->data[$arrki[0]])) { // more than 1 line
+        if (!is_array($this->line_color)) {
+          $this->line_color = array($this->line_color);
+        }
+        if (!is_array($this->line_bgcolor)) {
+          $this->line_bgcolor = array($this->line_bgcolor);
+        }
+        for ($i = 0; $i < count($arrki); $i++) {
+          $this->__AllocateColor("im_line_color",
+                                 $this->line_color[$i],
+                                 $this->graph_transparencylevel,
+                                 $i);
+          if ($this->axis_deepness > 0) {
+            $this->__AllocateColor("im_line_bgcolor",
+                                   $this->line_bgcolor[$i],
+                                   $this->graph_transparencylevel,
+                                   $i);
+          }
+          $arrkj = array_keys($this->data[$arrki[$i]]);
+          for ($j = 1; $j < count($arrkj); $j++) {
+            $this->__DrawLine(array($arrkj[$j - 1],
+                                    $arrkj[$j],
+                                    $this->data[$arrki[$i]][$arrkj[$j - 1]],
+                                    $this->data[$arrki[$i]][$arrkj[$j]]),
+                              $this->im_line_color[$i],
+                              $this->im_line_bgcolor[$i]);
+          }
+        }
+      } else {
+        $this->__AllocateColor("im_line_color",
+                               $this->line_color,
+                               $this->graph_transparencylevel);
+        $this->__AllocateColor("im_line_bgcolor",
+                               $this->line_bgcolor,
+                               $this->graph_transparencylevel);
+        for ($i = 1; $i < count($arrki); $i++) {
+          $this->__DrawLine(array($i - 1, // x1
+                                  $i,     // x2
+                                  $this->data[$arrki[$i - 1]], // y1
+                                  $this->data[$arrki[$i]]),    // y2
+                            $this->im_line_color,
+                            $this->im_line_bgcolor);
+        }
+        // exit;
+      }
+      
+      $this->__Draw_TopRight_Axis();
+      
+      CGraph::DrawGraph2();
+
+      if (strlen($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 $ret;
+    }
+
+    /**
+     * Graph::__DrawLine()
+     * Draws a line between 2 points
+     **/
+    function __DrawLine($points, $color, $bgcolor) {
+      if (!isset($this->line_unitX) || !isset($this->line_unitY)) {
+        $this->line_unitX = ($this->graph_width - $this->graph_padding['left'] - $this->graph_padding['right']) / ($this->axis_maxX - $this->axis_minX);
+        $this->line_unitY = $this->graph_areaheight / ($this->axis_maxY - $this->axis_minY);
+      }
+      $x1 = $this->graph_padding['left'] + floor(($points[0] - $this->axis_minX) * $this->line_unitX) + $this->line_unitX;
+      $x2 = $this->graph_padding['left'] + floor(($points[1] - $this->axis_minX) * $this->line_unitX) + $this->line_unitX;
+      $y1 = $this->graph_height - $this->graph_padding['bottom'] - floor(($points[2] - $this->axis_minY) * $this->line_unitY);
+      $y2 = $this->graph_height - $this->graph_padding['bottom'] - floor(($points[3] - $this->axis_minY) * $this->line_unitY);
+      // echo "drawing line from ($x1, $y1) to ($x2, $y2)<br />";
+      if ($this->axis_deepness > 0) {
+        $this->__DrawPolygon(array($x1, $y1,
+                                   $x1 + $this->axis_deepness, $y1 - $this->axis_deepness,
+                                   $x2 + $this->axis_deepness, $y2 - $this->axis_deepness,
+                                   $x2, $y2),
+                             $bgcolor,
+                             true);
+        $this->__DrawPolygon(array($x1, $y1,
+                                   $x1 + $this->axis_deepness, $y1 - $this->axis_deepness,
+                                   $x2 + $this->axis_deepness, $y2 - $this->axis_deepness,
+                                   $x2, $y2),
+                             $color);
+      } else {
+        imageline($this->im, $x1, $y1, $x2, $y2, $color);
+      }
+    }
+
+    /**
+     * Graph::__LoadLineValues()
+     * Loads definitions to line settings
+     **/
+    function __LoadLineValues($data) {
+      foreach ($data as $name => $value) {
+        $name = strtolower($name);
+        switch ($name) {
+          case 'background-color':
+            $this->__SetColorToValue("line_bgcolor", $value);
+            break;
+          case 'color':
+            $this->__SetColorToValue("line_color", $value);
+            break;
+        }
+      }
+    }
+  }
+?>