<?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;

        }

      }

    }

  }

?>