<?php

  class CGraph {

    var $data = array();

    //---------------------------------------------

    var $graph_areaheight = 100;

    var $graph_areawidth = 50;

    var $graph_padding = array('left' => 50, 'top' => 20, 'right'  => 20, 'bottom' => 20);

    var $graph_title = "";

    var $graph_titlefont = 3;

    var $graph_bgcolor = array(255, 255, 255);

    var $graph_bgtransparent = false;

    var $graph_transparencylevel = 0;

    var $graph_borderwidth = 1;

    var $graph_bordercolor = array(218, 218, 239);

    var $graph_titlecolor = array(99, 88, 78);

    //---------------------------------------------

    var $axis_stepX = 1;

    var $axis_stepY = 1;

    var $axis_stepSize = 3;

    var $axis_deepness = 0;

    var $axis_maxX = 0;

    var $axis_minX = 0;

    var $axis_maxY = 0;

    var $axis_minY = 0;

    var $axis_bordercolor = array(99, 88, 78);

    var $axis_bgcolor = array(152, 137, 124);

    var $axis_scalefont = 2;

    var $axis_scalecolor = array(0, 0, 255);

    var $axis_xscalevisible = true;

    var $axis_yscalevisible = true;

    var $axis_gridlines = true;

    var $axis_frontgridlines = true;

    var $axis_positions = array(true, false, false, true);

    var $axis_modeX = 0; // 0=diference between steps 1=number of steps

    var $axis_modeY = 0; // 0=diference between steps 1=number of steps

    //---------------------------------------------

    var $scale_roundX = 1;

    var $scale_roundY = 1;

    var $scale_funX = "";

    var $scale_funY = "";

    //---------------------------------------------

    var $legend_visible = false;

    var $legend_floating = false;

    var $legend_borderwidth = 1;

    var $legend_bgcolor = array(255, 255, 255);

    var $legend_bordercolor = array(0, 0, 0);

    var $legend_width = 0;

    var $legend_height = 0;

    var $legend_padding = 30;

    var $legend_insidepadding = 3;

    var $legend_font = 1;

    var $legend_position = 3; // 1=bottom left | 2=top left | 3=top right | 4=bottom right

    var $legend_color = array(array(0, 0, 255));

    var $legend_data = array("Item 1");

    function CGraph() {

      //nothing @ the moment.. maybe later will set image at startup

    }

    /****************************************************************

                                GRAPH

    ****************************************************************/

    function SetGraphAreaHeight($height) {

      if ($height > 0) {

        $this->graph_areaheight = $height;

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

      }

    }

    function SetGraphAreaWidth($width) {

      if ($width > 0) {

        $this->graph_areawidth = $width;

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

      }

    }

    function SetGraphPadding($left, $top, $right, $bottom) {

      $this->graph_padding = array('left' => (int)$left, 'top' => (int)$top, 'right' => (int)$right, 'bottom' => (int)$bottom);

    }

    function SetGraphTitle($title) {

      $this->graph_title = $title;

    }

    function SetGraphTitleFont($font) {

      $this->graph_titlefont = 0;

      switch ($font) {

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

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

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

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

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

        default:

          $this->graph_titlefont = $font;

      }

    }

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

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

    }

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

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

    }

    function SetGraphBorderWidth($width = 0) {

      $this->graph_borderwidth = $width;

    }

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

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

    }

    function SetGraphBackgroundTransparent($addtransparency = true, $red = 255, $green = 0, $blue = 255) {

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

      $this->graph_bgtransparent = ($addtransparency ? true : false);

    }

    function SetGraphTransparency($percent) {

      if ($percent < 0) $percent = 0;

      elseif ($percent > 100) $percent = 127;

      else $percent = $percent * 1.27;

      $this->graph_transparencylevel = $percent;

    }

    /****************************************************************

                                 AXIS

    ****************************************************************/

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

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

    }

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

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

    }

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

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

    }

    function SetAxisStepX($step) {

      if ($step > 0) $this->axis_stepX = $step;

    }

    function SetAxisStepY($step) {

      if ($step > 0) $this->axis_stepY = $step;

    }

    function SetAxisStepSize($size) {

      $this->axis_stepSize = (int) $size;

    }

    function SetAxisScaleXVisibility($state) {

      $this->axis_xscalevisible = ($state ? true : false);

    }

    function SetAxisScaleYVisibility($state) {

      $this->axis_yscalevisible = ($state ? true : false);

    }

    function SetAxisModeX($mode) {

      switch ($mode) {

        case '0':

        case 'value':

          $this->axis_modeX = 0; break;

        case '1':

        case 'dynamic':

          $this->axis_modeX = 1; break;

        case '2':

        case 'pixel':

          $this->axis_modeX = 2; break;

      }

    }

    function SetAxisModeY($mode) {

      switch ($mode) {

        case '0':

        case 'value':

          $this->axis_modeY = 0; break;

        case '1':

        case 'dynamic':

          $this->axis_modeY = 1; break;

        case '2':

        case 'pixel':

          $this->axis_modeY = 2; break;

      }

    }

    function SetAxisDeepness($deepness) {

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

    }

    function SetAxisScaleFont($font) {

      $this->axis_scalefont = 0;

      switch ($font) {

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

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

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

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

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

        default:

          $this->axis_scalefont = $font;

      }

    }

    function SetAxisPositions($positions) {

      $positions = explode(",", strtolower($positions));

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

      for ($i = 0; $i < count($positions); $i++) {

        if ($positions[$i][0] == '-') {

          $v = false;

          $positions[$i] = substr($positions[$i], 1);

        } else $v = true;

        switch ($positions[$i]) {

          case 'all':    $this->axis_positions = array($v, $v, $v, $v); break;

          case 'left':   $this->axis_positions[0] = $v; break;

          case 'top':    $this->axis_positions[1] = $v; break;

          case 'right':  $this->axis_positions[2] = $v; break;

          case 'bottom': $this->axis_positions[3] = $v; break;

        }

      }

    }

    function SetAxisGridlines($state) {

      $this->axis_gridlines = ($state ? true : false);

    }

    function SetAxisFrontGridlines($state) {

      $this->axis_frontgridlines = ($state ? true : false);

    }

    /****************************************************************

                                 SCALE

    ****************************************************************/

    function SetScaleRoundX($number) {

      if ($number < 0) $number = 0;

      $this->scale_roundX = (int) $number;

    }

    function SetScaleRoundY($number) {

      if ($number < 0) $number = 0;

      $this->scale_roundY = (int) $number;

    }

    function SetScaleFunctionX($name) {

      $this->scale_funX = $name;

    }

    function SetScaleFunctionY($name) {

      $this->scale_funY = $name;

    }

    /****************************************************************

                                LEGEND

    ****************************************************************/

    function SetLegendVisible($visible) {

      $this->legend_visible = ($visible ? true : false);

    }

    function SetLegendFloating($floating) {

      $this->legend_floating = ($floating ? true : false);

    }

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

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

    }

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

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

    }

    function SetLegendBorderWidth($width = 0) {

      $this->legend_borderwidth = $width;

    }

    function SetLegendColors($colors) {

      $this->__SetColorToValue("legend_color", $colors);

    }

    function SetLegendPadding($padding = 0) {

      $this->legend_padding = $padding;

    }

    function SetLegendInsidePadding($padding = 0) {

      $this->legend_insidepadding = $padding;

    }

    function SetLegendPosition($position) {

      switch ($position) {

        case 1:

        case 'bottom left':

          $this->legend_position = 1; break;

        case 2:

        case 'top left':

          $this->legend_position = 2; break;

        case 3:

        case 'top right':

          $this->legend_position = 3; break;

        case 4:

        case 'bottom right':

          $this->legend_position = 4; break;

      }

    }

    function SetLegendData($data) {

      if (is_array($data)) {

        $this->legend_data = $data;

      }

    }

    function SetLegentFont($font) {

      $this->legend_font = 0;

      switch ($font) {

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

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

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

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

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

        default:

          $this->legend_font = $font;

      }

    }

    /****************************************************************

                                 DATA

    ****************************************************************/

    function SetData($data) {

      if (is_array($data)) {

        $this->data = $data;

      }

    }

    function LoadGraph($path) {

      if (($fp = @fopen($path, "r")) !== false) {

        $content = "";

        while (!feof($fp)) {              // I do not use filesize() here

          $content .= fread($fp, 4096);   // because of remote files. If

        }                                 // there is no problem with them

        fclose($fp);                      // please let me know

        $this->__LoadGraphDefinitions($content);

        return true;

      } else return false;

    }

    function DrawGraph() {

      if ($this->graph_transparencylevel) {

        imagealphablending($this->im, true);

      }

      if ($this->legend_visible) {

        $maxlength = 0;

        for ($i = 0; $i < count($this->legend_data); $i++) {

          if (strlen($this->legend_data[$i]) > $maxlength) $maxlength = strlen($this->legend_data[$i]);

        }

        $this->legend_width = ($this->legend_insidepadding * 4) + ($maxlength * imagefontwidth($this->legend_font));

        if (!$this->legend_floating) {

          $this->graph_padding[($this->legend_position < 3 ? 'left' : 'right')] += $this->legend_padding + $this->legend_width;

          $this->graph_areawidth -= ($this->legend_padding + $this->legend_width);

        }

      }

      $this->__PaintBackground();

      $this->__DrawAxis();

    }

    function DrawGraph2() {

      if (strlen($this->graph_title)) {

        $this->__AllocateColor("im_graph_titlecolor",

                               $this->graph_titlecolor,

                               $this->graph_transparencylevel);

        $this->__DrawText($this->graph_title,

                          floor($this->graph_width / 2),

                          floor(($this->graph_padding['top'] - $this->axis_deepness - imagefontwidth($this->graph_titlefont)) / 2),

                          $this->im_graph_titlecolor,

                          $this->graph_titlefont,

                          1);

      }

      $this->__DrawLegend();

    }

    function __PaintBackground() {

      $this->__AllocateColor("im_graph_bgcolor",

                             $this->graph_bgcolor,

                             0);

      if ($this->graph_bgtransparent) {

        imagecolortransparent($this->im, $this->im_graph_bgcolor);

      }

      imagefilledrectangle($this->im, 0, 0, $this->graph_width, $this->graph_height, $this->im_graph_bgcolor);

      if ($this->graph_borderwidth) {

        $this->__AllocateColor("im_graph_bordercolor",

                               $this->graph_bordercolor,

                               $this->graph_transparencylevel);

        for ($i = 0; $i < $this->graph_borderwidth; $i++) {

          imagerectangle($this->im,

                         $i,

                         $i,

                         $this->graph_width - 1 - $i,

                         $this->graph_height - 1 - $i,

                         $this->im_graph_bordercolor);

        }

      }

    }

    function __DrawAxis() {

      $this->__AllocateColor("im_axis_bordercolor",

                             $this->axis_bordercolor,

                             $this->graph_transparencylevel);

      $this->__AllocateColor("im_axis_bgcolor",

                             $this->axis_bgcolor,

                             $this->graph_transparencylevel);

      $this->__AllocateColor("im_axis_scalecolor",

                             $this->axis_scalecolor,

                             $this->graph_transparencylevel);

      list($this->axis_minX,

           $this->axis_maxX,

           $this->axis_minY,

           $this->axis_maxY) = $this->__GetMinMaxGraphValue();

      if ($this->axis_gridlines) {

        $style = array($this->im_axis_bordercolor, $this->im_graph_bgcolor);

        imagesetstyle($this->im, $style);

      }

      if ($this->axis_modeX == 1) {

        $this->axis_stepX = ($this->axis_maxX - $this->axis_minX) / $this->axis_stepX;

      } elseif ($this->axis_modeX == 2) {

        $this->axis_stepX = $this->axis_stepX * ($this->axis_maxX - $this->axis_minX) / $this->graph_areawidth;

      }

      if ($this->axis_modeY == 1) {

        $this->axis_stepY = ($this->axis_maxY - $this->axis_minY) / $this->axis_stepY;

      } elseif ($this->axis_modeY == 2) {

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

        $rest = abs($this->axis_maxY) % $this->axis_stepY;

          // need to center a step on coord 0

      }

      if (!$this->axis_deepness) {

        $this->axis_frontgridlines = 1;

      }

      if (!$this->axis_xscalevisible) {

        $this->axis_positions[1] = 0;

        $this->axis_positions[3] = 0;

      }

      if (!$this->axis_yscalevisible) {

        $this->axis_positions[0] = 0;

        $this->axis_positions[2] = 0;

      }

      $this->__CorrectMinMax($this->axis_minX, $this->axis_maxX, $this->axis_stepX);

      $this->__CorrectMinMax($this->axis_minY, $this->axis_maxY, $this->axis_stepY);

      if ($this->axis_yscalevisible) {

        $this->__DrawHorizontalGridlines();

      }

      $this->__DrawHorizontalGideGridlines();

      if ($this->axis_xscalevisible) {

        $this->__DrawVerticalGridlines();

      }

      $this->__DrawVerticalGideGridlines();

      // draw lines that separate bars

      $total_bars = count($this->data);

      if ( min($this->data) >= 0 && get_class($this) == 'BarGraph' )

      {

        $totalbarwidth = $this->bar_width + ($this->bar_padding * 2);

        for ($i = 0; $i < $total_bars; $i++) {

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

                    ($totalbarwidth * $i);

          $this->__DrawPolygon(

                    array(

                          $offset + $totalbarwidth,                     $this->graph_height - $this->graph_padding['bottom'],                      // top right

                          $offset,                                      $this->graph_height - $this->graph_padding['bottom'],                      // top left

                          $offset + $this->bar_height,                  $this->graph_height - $this->graph_padding['bottom'] - $this->bar_height,  // bottom left

                          $offset + $this->bar_height + $totalbarwidth, $this->graph_height - $this->graph_padding['bottom'] - $this->bar_height), // bottom right

                    $this->im_axis_bgcolor, true);

          imageline($this->im,

                    $offset,                         $this->graph_height - $this->graph_padding['bottom'],

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

                    $this->im_axis_bordercolor);

        }

      }

    }

    function __Draw_LeftBottom_Axis() {

      $w = $this->graph_width;

      $h = $this->graph_height;

      $p = $this->graph_padding;

      if ($this->axis_positions[3]) {

        $this->__DrawAxisPart($p['left'], $h - $p['bottom'], $w - $p['right'], $h - $p['bottom'],

                              $this->axis_minX, $this->axis_maxX, $this->axis_stepX,

                              "right", "bottom");

      }

      if ($this->axis_positions[0]) {

        $this->__DrawAxisPart($p['left'], $p['top'], $p['left'], $h - $p['bottom'],

                              $this->axis_minY, $this->axis_maxY, $this->axis_stepY,

                              "up", "left");

      }

    }

    function __Draw_TopRight_Axis() {

      $w = $this->graph_width;

      $h = $this->graph_height;

      $p = $this->graph_padding;

      if ($this->axis_positions[1]) {

        $this->__DrawAxisPart($p['left'], $p['top'], $w - $p['right'], $p['top'],

                              $this->axis_minX, $this->axis_maxX, $this->axis_stepX,

                              "right", "top");

      }

      if ($this->axis_positions[2]) {

        $this->__DrawAxisPart($w - $p['right'], $p['top'], $w - $p['right'], $h - $p['bottom'],

                              $this->axis_minY, $this->axis_maxY, $this->axis_stepY,

                              "up", "right");

      }

    }

    function __CorrectMinMax(&$min, &$max, &$step) {

      if (($max % $step) != 0) $max += ($step - abs($max % $step));

      if (($min % $step) != 0) $min -= abs($min % $step);

    }

    function __DrawHorizontalGridlines() {

      $maxy = $this->graph_height - $this->graph_padding['bottom'];

      $miny = $this->graph_padding['top'];

      $maxx = $this->graph_width - $this->graph_padding['right'];

      $minx = $this->graph_padding['left'];

      $offset = ($maxy - $miny) / ($this->axis_maxY - $this->axis_minY) * $this->axis_stepY;

      $v = $miny + $offset;

      $deep = $this->axis_deepness;

      if (!$deep) $grid_offset = $this->axis_stepSize;

      else $grid_offset = 1;

      while ($v < $maxy) {

        imageline($this->im, $minx + $deep + (!$this->axis_positions[0] ? 0 : $grid_offset),

                             floor($v) - $deep,

                             $maxx + $deep - (!$this->axis_positions[2] ? 0 : $grid_offset),

                             floor($v) - $deep, IMG_COLOR_STYLED);

        $v += $offset;

      }

    }

    function __DrawHorizontalGideGridlines() {

      $maxy = $this->graph_height - $this->graph_padding['bottom'];

      $miny = $this->graph_padding['top'];

      $maxx = $this->graph_width - $this->graph_padding['right'];

      $minx = $this->graph_padding['left'];

      $deep = $this->axis_deepness;

      if (!$deep) $grid_offset = $this->axis_stepSize;

      else $grid_offset = 1;

      if (!$this->axis_positions[1]) {

        if ($deep) {

          imageline($this->im, $minx + $deep + $grid_offset, $miny - $deep,

                    $maxx + $deep + $grid_offset, $miny - $deep, IMG_COLOR_STYLED);

        }

        if ($this->axis_frontgridlines) {

          imageline($this->im, $minx, $miny, $maxx, $miny, IMG_COLOR_STYLED);

        }

      }