graphing/class.linegraph.php
author Dan
Tue, 20 Jan 2009 22:08:17 -0500
changeset 52 a8f0e99883d1
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Web interface can now update with AJAX
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<?php
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  require_once dirname(__FILE__) . "/class.graph.php";
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  class LineGraph extends CGraph {
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    var $line_color = array(39, 78, 120);
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    var $line_bgcolor = array(69, 129, 194);
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    function LineGraph() {
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      $this->graph_width = $this->graph_padding['left'] + $this->graph_areawidth + $this->graph_padding['right'];
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      $this->graph_height = $this->graph_padding['top'] + $this->graph_areaheight + $this->graph_padding['bottom'];
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    }
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    /**
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     * Graph::SetLineColor()
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     * Sets line color
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     **/
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    function SetLineColor($red, $green, $blue) {
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      $this->line_color = array($red, $green, $blue);
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    }
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    /**
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     * Graph::AddLineColor()
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     * Sets line color
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     **/
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    function AddLineColor($red, $green, $blue) {
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      if (!is_array($this->line_color[0])) {
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        $this->line_color = array($this->line_color);
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      }
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      $this->line_color[] = array($red, $green, $blue);
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    }
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    /**
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     * Graph::SetLineBackgroundColor()
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     * Sets background color for line (when 3D)
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     **/
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    function SetLineBackgroundColor($red, $green, $blue) {
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      $this->line_bgcolor = array($red, $green, $blue);
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    }
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    /**
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     * Graph::AddLineBackgroundColor()
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     * Sets line background color
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     **/
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    function AddLineBackgroundColor($red, $green, $blue) {
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      if (!is_array($this->line_bgcolor[0])) {
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        $this->line_bgcolor = array($this->line_bgcolor);
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      }
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      $this->line_bgcolor[] = array($red, $green, $blue);
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    }
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    /**
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     * Graph::DrawGraph()
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     * Draw all the graph: bg, axis, bars, text.. and output it
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     * Optional file parameter turns output to file, and bool on success
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     **/
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    function DrawGraph($file = "") {
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      $this->im = imagecreatetruecolor($this->graph_width, $this->graph_height);
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      CGraph::DrawGraph();
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      $this->__Draw_LeftBottom_Axis();
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      $arrki = array_keys($this->data);
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      if (is_array($this->data[$arrki[0]])) { // more than 1 line
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        if (!is_array($this->line_color)) {
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          $this->line_color = array($this->line_color);
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        }
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        if (!is_array($this->line_bgcolor)) {
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          $this->line_bgcolor = array($this->line_bgcolor);
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        }
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        for ($i = 0; $i < count($arrki); $i++) {
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          $this->__AllocateColor("im_line_color",
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                                 $this->line_color[$i],
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                                 $this->graph_transparencylevel,
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                                 $i);
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          if ($this->axis_deepness > 0) {
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            $this->__AllocateColor("im_line_bgcolor",
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                                   $this->line_bgcolor[$i],
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                                   $this->graph_transparencylevel,
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                                   $i);
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          }
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          $arrkj = array_keys($this->data[$arrki[$i]]);
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          for ($j = 1; $j < count($arrkj); $j++) {
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            $this->__DrawLine(array($arrkj[$j - 1],
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                                    $arrkj[$j],
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                                    $this->data[$arrki[$i]][$arrkj[$j - 1]],
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                                    $this->data[$arrki[$i]][$arrkj[$j]]),
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                              $this->im_line_color[$i],
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                              $this->im_line_bgcolor[$i]);
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          }
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        }
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      } else {
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        $this->__AllocateColor("im_line_color",
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                               $this->line_color,
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                               $this->graph_transparencylevel);
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        $this->__AllocateColor("im_line_bgcolor",
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                               $this->line_bgcolor,
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                               $this->graph_transparencylevel);
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        for ($i = 1; $i < count($arrki); $i++) {
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          $this->__DrawLine(array($i - 1, // x1
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                                  $i,     // x2
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                                  $this->data[$arrki[$i - 1]], // y1
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                                  $this->data[$arrki[$i]]),    // y2
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                            $this->im_line_color,
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                            $this->im_line_bgcolor);
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        }
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        // exit;
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      }
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      $this->__Draw_TopRight_Axis();
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      CGraph::DrawGraph2();
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      if (strlen($file)) {
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        $ret = imagepng($this->im, $file);
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      } else {
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        header("Content-Type: image/png"); // thanks to Marcin G. :)
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        imagepng($this->im);
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        $ret = true;
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      }
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      imagedestroy($this->im);
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      return $ret;
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    }
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    /**
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     * Graph::__DrawLine()
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     * Draws a line between 2 points
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     **/
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    function __DrawLine($points, $color, $bgcolor) {
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      if (!isset($this->line_unitX) || !isset($this->line_unitY)) {
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        $this->line_unitX = ($this->graph_width - $this->graph_padding['left'] - $this->graph_padding['right']) / ($this->axis_maxX - $this->axis_minX);
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        $this->line_unitY = $this->graph_areaheight / ($this->axis_maxY - $this->axis_minY);
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      }
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      $x1 = $this->graph_padding['left'] + floor(($points[0] - $this->axis_minX) * $this->line_unitX) + $this->line_unitX;
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      $x2 = $this->graph_padding['left'] + floor(($points[1] - $this->axis_minX) * $this->line_unitX) + $this->line_unitX;
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      $y1 = $this->graph_height - $this->graph_padding['bottom'] - floor(($points[2] - $this->axis_minY) * $this->line_unitY);
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      $y2 = $this->graph_height - $this->graph_padding['bottom'] - floor(($points[3] - $this->axis_minY) * $this->line_unitY);
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      // echo "drawing line from ($x1, $y1) to ($x2, $y2)<br />";
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      if ($this->axis_deepness > 0) {
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        $this->__DrawPolygon(array($x1, $y1,
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                                   $x1 + $this->axis_deepness, $y1 - $this->axis_deepness,
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                                   $x2 + $this->axis_deepness, $y2 - $this->axis_deepness,
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                                   $x2, $y2),
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                             $bgcolor,
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                             true);
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        $this->__DrawPolygon(array($x1, $y1,
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                                   $x1 + $this->axis_deepness, $y1 - $this->axis_deepness,
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                                   $x2 + $this->axis_deepness, $y2 - $this->axis_deepness,
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                                   $x2, $y2),
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                             $color);
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      } else {
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        imageline($this->im, $x1, $y1, $x2, $y2, $color);
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      }
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    }
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    /**
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     * Graph::__LoadLineValues()
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     * Loads definitions to line settings
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     **/
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    function __LoadLineValues($data) {
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      foreach ($data as $name => $value) {
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        $name = strtolower($name);
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        switch ($name) {
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          case 'background-color':
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            $this->__SetColorToValue("line_bgcolor", $value);
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            break;
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          case 'color':
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            $this->__SetColorToValue("line_color", $value);
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            break;
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        }
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      }
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    }
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  }
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?>