<?php

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

  class BarGraph extends CGraph {

    var $bar_width = 32;

    var $bar_height = 8;

    var $bar_padding = 5;

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

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

    var $bar_textfont = 2;

    function BarGraph() {

      $this->axis_deepness = $this->bar_height;

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

    }

    /**

     * Graph::SetBarBorderColor()

     * Sets border color for bars

     **/

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

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

    }

    /**

     * Graph::SetBarBackgroundColor()

     * Sets background color for bars

     **/

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

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

    }

    /**

     * Graph::SetBarDimensions()

     * Sets with and height of each bar

     **/

    function SetBarDimensions($width, $height) {

      if ($width > 0) $this->bar_width = $width;

      if ($height >= 0) {

        $this->bar_height = $height;

        $this->axis_deepness = $height;

      }

    }

    /**

     * Graph::SetBarPadding()

     * Sets padding (border) around each bar

     **/

    function SetBarPadding($padding) {

      if ($padding > 0) $this->bar_padding = $padding;

    }

    function SetBarFont($font) {

      $this->bar_textfont = 0;

      switch ($font) {

        case 'x-large': $this->bar_textfont++;

        case 'large':   $this->bar_textfont++;

        case 'medium':  $this->bar_textfont++;

        case 'small':   $this->bar_textfont++;

        case 'x-small': $this->bar_textfont++; break;

        default:

          $this->bar_textfont = $font;

      }

    }

    function DrawGraph($file = "") {

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

                           (count($this->data) * ($this->bar_width + ($this->bar_padding * 2))) +

                           $this->graph_padding['right'];

      $this->axis_deepness = $this->bar_height;

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

      $this->axis_frontgridlines = 0;

      $this->axis_xscalevisible = 0;

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

      CGraph::DrawGraph();

      if ($this->axis_minY > 0) $this->axis_minY = 0;

      if ($this->axis_maxY < 0) $this->axis_maxY = 0;

      $this->__Draw_LeftBottom_Axis();

      $p = 0;

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

        $p++;

        $this->__DrawBarText($p, $name);

        $this->__DrawBar($p, $value);

      }

      $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::__DrawBarText()

     * Determines top and left to draw text to a choosen bar

     **/

    function __DrawBarText($bar, $text) {

      $this->__DrawText($text,

                        $this->graph_padding['left'] + (($this->bar_width + ($this->bar_padding * 2)) * ($bar - 0.5)),

                        $this->graph_height - $this->graph_padding['bottom'] + 1,

                        $this->im_axis_scalecolor,

                        $this->bar_textfont,

                        1);

    }

    /**

     * Graph::__DrawBar()

     * Draws a choosen bar with it's value

     **/

    function __DrawBar($bar, $value) {

      $x = $this->graph_padding['left'] +

           (($this->bar_width + ($this->bar_padding * 2)) * ($bar - 1)) +

           $this->bar_padding;

      $y = $this->graph_areaheight / ($this->axis_maxY - $this->axis_minY);

      if ($value >= 0) {

        $this->____DrawBar($x,

                           $this->graph_height - $this->graph_padding['bottom'] - abs(floor($this->axis_minY * $y)) - floor($y * $value),

                           $x + $this->bar_width,

                           $this->graph_height - $this->graph_padding['bottom'] - abs(floor($this->axis_minY * $y)));

      } else {

        $this->____DrawBar($x,

                           $this->graph_height - $this->graph_padding['bottom'] - abs(floor($this->axis_minY * $y)),

                           $x + $this->bar_width,

                           $this->graph_height - $this->graph_padding['bottom'] - floor($this->axis_minY * -$y) + floor($y * -$value));

      }

    }

    /**

     * Graph::____DrawBar()

     * Draws the actual rectangles that form a bar

     **/

    function ____DrawBar($x1, $y1, $x2, $y2) {

      $this->__AllocateColor("im_bar_bordercolor",

                             $this->bar_bordercolor,

                             ( $this->graph_transparencylevel * 1.5));

      $this->__AllocateColor("im_bar_bgcolor",

                             $this->bar_bgcolor,

                             ( $this->graph_transparencylevel * 1.5));

      // base square

      $this->__DrawPolygon(array($x1, $y2, $x2, $y2, $x2 + $this->bar_height,

                                 $y2 - $this->bar_height, $x1 + $this->bar_height,

                                 $y2 - $this->bar_height),

                           $this->im_bar_bgcolor,

                           true);

      $this->__DrawPolygon(array($x1, $y2, $x2, $y2, $x2 + $this->bar_height,

                                 $y2 - $this->bar_height, $x1 + $this->bar_height,

                                 $y2 - $this->bar_height),

                           $this->im_bar_bordercolor);

      // back square

      $this->__DrawPolygon(array($x1 + $this->bar_height, $y1 - $this->bar_height,

                                 $x2 + $this->bar_height, $y1 - $this->bar_height,

                                 $x2 + $this->bar_height, $y2 - $this->bar_height,

                                 $x1 + $this->bar_height, $y2 - $this->bar_height),

                           $this->im_bar_bgcolor,

                           true);

      $this->__DrawPolygon(array($x1 + $this->bar_height, $y1 - $this->bar_height,

                                 $x2 + $this->bar_height, $y1 - $this->bar_height,

                                 $x2 + $this->bar_height, $y2 - $this->bar_height,

                                 $x1 + $this->bar_height, $y2 - $this->bar_height),

                           $this->im_bar_bordercolor);

      // left square

      $this->__DrawPolygon(array($x1, $y1, $x1 + $this->bar_height, $y1 - $this->bar_height,

                                 $x1 + $this->bar_height, $y2 - $this->bar_height,

                                 $x1, $y2),

                           $this->im_bar_bgcolor,

                           true);

      $this->__DrawPolygon(array($x1, $y1, $x2, $y1, $x2, $y2, $x1, $y2),

                           $this->im_bar_bordercolor);

      // front square

      $this->__DrawPolygon(array($x1, $y1, $x2, $y1, $x2, $y2, $x1, $y2),

                           $this->im_bar_bgcolor,

                           true);

      $this->__DrawPolygon(array($x1, $y1, $x2, $y1, $x2, $y2, $x1, $y2),

                           $this->im_bar_bordercolor);

      // right square

      $this->__DrawPolygon(array($x2, $y2, $x2, $y1, $x2 + $this->bar_height,

                                 $y1 - $this->bar_height, $x2 + $this->bar_height,

                                 $y2 - $this->bar_height),

                           $this->im_bar_bgcolor,

                           true);

      $this->__DrawPolygon(array($x2, $y2, $x2, $y1, $x2 + $this->bar_height,

                                 $y1 - $this->bar_height, $x2 + $this->bar_height,

                                 $y2 - $this->bar_height),

                           $this->im_bar_bordercolor);

      // top square

      $this->__DrawPolygon(array($x1, $y1, $x2, $y1, $x2 + $this->bar_height,

                                 $y1 - $this->bar_height, $x1 + $this->bar_height,

                                 $y1 - $this->bar_height),

                           $this->im_bar_bgcolor,

                           true);

      $this->__DrawPolygon(array($x1, $y1, $x2, $y1, $x2 + $this->bar_height,

                                 $y1 - $this->bar_height, $x1 + $this->bar_height,

                                 $y1 - $this->bar_height),

                           $this->im_bar_bordercolor);

    }

    /**

     * Graph::__Load3dbarValues()

     * Loads definitions to 3d bar settings

     **/

    function __Load3dbarValues($data) {

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

        $name = strtolower($name);

        switch ($name) {

          case 'background-color':

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

            break;

          case 'border-color':

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

            break;

          case 'padding':

            $this->bar_padding = $value;

            break;

          case 'width':

            $this->bar_width = (int) $value;

            break;

          case 'height':

            $this->bar_height = (int) $value;

            $this->axis_deepness = (int) $value;

            break;

        }

      }

    }

  }

?>