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<?php

// +-----------------------------------------------------------------------+

// | PhpWebGallery - a PHP based picture gallery                           |

// | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |

// | Copyright (C) 2003-2005 PhpWebGallery Team - http://phpwebgallery.net |

// +-----------------------------------------------------------------------+

// | branch        : BSF (Best So Far)

// | file          : $RCSfile: phpBarGraph.php,v $

// | last update   : $Date: 2005/01/07 23:10:51 $

// | last modifier : $Author: plg $

// | revision      : $Revision: 1.3 $

// +-----------------------------------------------------------------------+

// | This program is free software; you can redistribute it and/or modify  |

// | it under the terms of the GNU General Public License as published by  |

// | the Free Software Foundation                                          |

// |                                                                       |

// | This program is distributed in the hope that it will be useful, but   |

// | WITHOUT ANY WARRANTY; without even the implied warranty of            |

// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |

// | General Public License for more details.                              |

// |                                                                       |

// | You should have received a copy of the GNU General Public License     |

// | along with this program; if not, write to the Free Software           |

// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |

// | USA.                                                                  |

// +-----------------------------------------------------------------------+

// Original PhpBarGraph Version 2.3 

// Written By TJ Hunter (tjhunter@ruistech.com)

// http://www.ruistech.com/phpBarGraph

// This class has been adapted to fill phpWG requirements

class PhpBarGraph

{

   /* -------------------------------- */

   /* Preference Variables             */

   /* -------------------------------- */

   var $_debug;

   var $_image;            // The image to print the bargraph too.

   var $_x;                // The starting column of the bargraph

   var $_y;                // The starting row of the bargraph

   var $_width;            // The width of the bargraph

   var $_height;           // The height of the bargraph

   var $_startBarColorHex; // The top color of the bargraph

   var $_endBarColorHex;   // The bottom color of the bargraph

   var $_lineColorHex;     // The color of the lines and text

   var $_barSpacing;       // The spacing width in between each bar

   var $_numOfValueTicks;  // The number of horizontal rule ticks

   var $_values;           // An array of arrays of the values of each bargraph and it's label

   var $_showLabels;       // If true, print the labels to the image

   var $_showValues;       // If true, print the values to the image

   var $_showBarBorder;    // If true, draws a box of around each bar

   var $_showFade;         // If true, draws each bar with a gradient

   var $_showOuterBox;     // If true, draws the box on the outside of the bargraph

   /* -------------------------------- */

   /* Private Variables                */

   /* -------------------------------- */

   var $_topMargin;

   var $_bottomMargin;

   var $_leftMargin;

   var $_rightMargin;

   var $_barWidth;

   var $_minBarHeight;

   var $_maxBarHeight;

   var $_realMinBarHeight;

   var $_realMaxBarHeight;

   var $_buffer;

   function PhpBarGraph()

   {

      $this->_debug = false;

      $this->_values = array();

      $this->_startBarColorHex = "0000ff";

      $this->_endBarColorHex = "ffffff";

      $this->_lineColorHex = "000000";

      $this->_barSpacing = 10;

      $this->_numOfValueTicks = 4;

      $this->_buffer = .5;

      $this->_showLabels = true;

      $this->_showValues = true;

      $this->_showBarBorder = true;

      $this->_showFade = true;

      $this->_showOuterBox = true;

   }

   function AddValue($labelName, $theValue)

   {

      array_push($this->_values, array("label" => $labelName, "value" => $theValue));

   }

   function SetDebug($debug)

   {

      $this->_debug = $debug;

   }

   function SetX($x)

   {

      $this->_x = $x;

   }

   function SetY($y)

   {

      $this->_y = $y;

   }

   function SetWidth($width)

   {

      $this->_width = $width;

   }

   function SetHeight($height)

   {

      $this->_height = $height;

   }

   function SetStartBarColor($color)

   {

      $this->_startBarColorHex = $color;

   }

   function SetEndBarColor($color)

   {

      $this->_endBarColorHex = $color;

   }

   function SetLineColor($color)

   {

      $this->_lineColorHex = $color;

   }

   function SetBarSpacing($barSpacing)

   {

      $this->_barSpacing = $barSpacing;

   }

   function SetNumOfValueTicks($ticks)

   {

      $this->_numOfValueTicks = $ticks;

   }

   function SetShowLabels($labels)

   {

      $this->_showLabels = $labels;

   }

   function SetShowValues($values)

   {

      $this->_showValues = $values;

   }

   function SetBarBorder($border)

   {

      $this->_showBarBorder = $border;

   }

   function SetShowFade($fade)

   {

      $this->_showFade = $fade;

   }

   function SetShowOuterBox($box)

   {

      $this->_showOuterBox = $box;

   }

   function RGBColor($hexColor) // Returns an array of decimal values from a hex color

   {

      $r = hexdec(substr($hexColor, 0, 2));

      $g = hexdec(substr($hexColor, 2, 2));

      $b = hexdec(substr($hexColor, 4, 2));

      $RGBColors = array("red" => $r, "green" => $g, "blue" => $b);

      return $RGBColors;

   }

   function DebugPrint() // Prints a bunch of debug information.

   {

      foreach($this->_values as $value)

      {

         echo $value["label"] . "=" . $value["value"] . "<br>\n";

      }

      $startColor = $this->RGBColor($this->_startBarColorHex);

      echo "StartColor: " . $startColor["red"] . ", " . $startColor["green"] . ", " . $startColor["blue"] . "<br>\n";

      $endColor = $this->RGBColor($this->_endBarColorHex);

      echo "EndColor: " . $endColor["red"] . ", " . $endColor["green"] . ", " . $endColor["blue"] . "<br>\n";

      $lineColor = $this->RGBColor($this->_lineColorHex);

      echo "LineColor: " . $lineColor["red"] . ", " . $lineColor["green"] . ", " . $lineColor["blue"] . "<br>\n";

      echo "x=" . $this->_x . "<br>\n";

      echo "y=" . $this->_y . "<br>\n";

      echo "width=" . $this->_width . "<br>\n";

      echo "height=" . $this->_height . "<br>\n";

      echo "startBarColorHex=" . $this->_startBarColorHex . "<br>\n";

      echo "endBarColorHex=" . $this->_endBarColorHex . "<br>\n";

      echo "lineColorHex=" . $this->_lineColorHex . "<br>\n";

      echo "barSpacing=" . $this->_barSpacing . "<br>\n";

      echo "numOfValueTicks=" . $this->_numOfValueTicks . "<br>\n";

   }

   function dif ($start,$end)

   {

	   if ($start >= $end)

		   $dif = $start - $end;

   	else

	   	$dif = $end - $start;

	   return $dif;

   }

   function draw($start,$end,$pos,$step_width)

   {

   	if ($start > $end)	

   		$color = $start - $step_width * $pos;

   	else

   		$color = $start + $step_width * $pos;

   	return $color;

   }	

   function fadeBar($image, $x1, $y1, $x2, $y2, $colorsStart, $colorsEnd, $height, $width) // Draws a rectangle with a gradient

   {

      $startColor = $this->RGBColor($colorsStart);

      $red_start = $startColor["red"];

      $green_start = $startColor["green"];

      $blue_start = $startColor["blue"];

      $endColor = $this->RGBColor($colorsEnd);

      $red_end = $endColor["red"];

      $green_end = $endColor["green"];

      $blue_end = $endColor["blue"];

      // difference between start and end

      $dif_red = $this->dif($red_start,$red_end);

      $dif_green = $this->dif($green_start,$green_end);

      $dif_blue = $this->dif($blue_start,$blue_end);

      $height = $height + 1;

      // width of one color step

      $step_red = $dif_red / $height;

      $step_green = $dif_green / $height;

      $step_blue = $dif_blue / $height;

      $width = $width - 1;

      for ($pos=0; $pos<=$height; $pos++)

      {

         $color = imagecolorexact ($image, $this->draw($red_start,$red_end,$pos,$step_red),

      						   			$this->draw($green_start,$green_end,$pos,$step_green),

      						   			$this->draw($blue_start,$blue_end,$pos,$step_blue));

         if ($color == -1) // If this color is already allocatated, don't allocate it again.

         {

         	$color = ImageColorAllocate($image,$this->draw($red_start,$red_end,$pos,$step_red),

         						   			$this->draw($green_start,$green_end,$pos,$step_green),

         						   			$this->draw($blue_start,$blue_end,$pos,$step_blue));	

         }      	

      	imageline($image,$x1,$pos+$y1,$x1+$width,$pos+$y1,$color);

      }

   }

   function DrawBarGraph($image)

   {

      if ($this->_debug)

         $this->DebugPrint();

      // Setup the margins

      $this->_topMargin = 0;

      $this->_bottomMargin = 30;

      $this->_leftMargin = 20;

      $this->_rightMargin = $this->_barSpacing + 1 + 10;

      // setup the color for the lines

      $tempLineColor = $this->RGBColor($this->_lineColorHex);

      $lineColor = ImageColorAllocate($image, $tempLineColor["red"], $tempLineColor["green"], $tempLineColor["blue"]);

      $tempStartColor = $this->RGBColor($this->_startBarColorHex);

      $startColor = ImageColorAllocate($image, $tempStartColor["red"], $tempStartColor["green"], $tempStartColor["blue"]);

      // Figure out how wide each bar is going to be.

      $this->_barWidth = ($this->_width - ($this->_leftMargin + $this->_rightMargin + 1) - (count($this->_values) * $this->_barSpacing)) / count($this->_values);

      // Find out what the smallest and largest amount is.

      $this->_minBarHeight = $this->_values[0]["value"];

      $this->_maxBarHeight = $this->_values[0]["value"];

      for ($i=1; $i < count($this->_values); $i++)

      {

         if ($this->_minBarHeight > $this->_values[$i]["value"])

         {

            $this->_minBarHeight = $this->_values[$i]["value"];

         }

         if ($this->_maxBarHeight < $this->_values[$i]["value"])

         {

            $this->_maxBarHeight = $this->_values[$i]["value"];

         }

      }

      if ($this->_minBarHeight == 0 && $this->_maxBarHeight > 0) // Having the min value as 0 looks funny

      {

         $this->_minBarHeight = 1;

      }

      $buff = 1;

      // Figure out how tall the tallest and smallest bar are going to be.

      $this->_realMinBarHeight = $this->_minBarHeight - ($this->_minBarHeight * $buff + 1);

      $this->_realMaxBarHeight = $this->_maxBarHeight * ($this->_buffer + 1);

      $workArea = $this->_height - $this->_bottomMargin - $this->_topMargin - 1;

      // Print out all the ticks

      if ($this->_numOfValueTicks > $this->_maxBarHeight)

      {

         $this->_numOfValueTicks = $this->_maxBarHeight;

      }

      for ($i=1; $i<=$this->_numOfValueTicks; $i++)

      {

         $thisBarValue = floor((($this->_maxBarHeight - $this->_minBarHeight) / $this->_numOfValueTicks) * $i) + $this->_minBarHeight;

         $myTickheight = ($workArea / ($this->_maxBarHeight - $this->_realMinBarHeight) * ($thisBarValue - $this->_realMinBarHeight));

         // Figure out where we're going to put this tick..

         $y1 = $this->_height - $this->_bottomMargin - 1 - ($myTickheight);

         if ($thisBarValue >= $this->_minBarHeight)

         {

            imageline($image, $this->_leftMargin - 5 + $this->_x, $y1 + $this->_y,  $this->_width - $this->_rightMargin + $this->_barSpacing + $this->_x, $y1 + $this->_y, $lineColor);

            Imagestring($image, 1, $this->_leftMargin + $this->_x - 15, $y1 + $this->_y + 2, $thisBarValue, $lineColor);

         }

      }

      // Print out all the bars

      for ($i=1; $i<=count($this->_values); $i++)

      {

         // Get the bar height for this bar.

         $myBarheight = ($workArea / ($this->_maxBarHeight - $this->_realMinBarHeight) * ($this->_values[$i-1]["value"] - $this->_realMinBarHeight));

         // Figure out where we're going to put this bar..

         $x1 = $this->_leftMargin + 1 + (($i-1) * $this->_barWidth) + ($i * $this->_barSpacing);

         $y1 = $this->_height - $this->_bottomMargin - 1 - ($myBarheight);

         $x2 = $this->_leftMargin + (($i-1) * $this->_barWidth) + ($i * $this->_barSpacing) + $this->_barWidth;

         $y2 = $this->_height - $this->_bottomMargin - 1;

         if ($this->_values[$i-1]["value"] != 0) // Don't print a bar if the value is 0

         {

            // Print the bar

            if ($this->_showFade)

            {

               $this->fadeBar($image, $x1 + $this->_x, $y1 + $this->_y, $x2 + $this->_x, $y2 + $this->_y, $this->_startBarColorHex, $this->_endBarColorHex, $myBarheight, $this->_barWidth);

            }

            else

            {

               ImageFilledRectangle($image, $x1 + $this->_x, $y1 + $this->_y, $x2 + $this->_x, $y2 + $this->_y, $startColor);

            }

            if ($this->_showBarBorder)

            {

               ImageRectangle($image, $x1 + $this->_x, $y1 + $this->_y, $x2 + $this->_x, $y2 + $this->_y + 1, $lineColor);

            }

         }   

         // Print the amount of the bar

         if ($this->_showValues)

         {

            Imagestring($image, 2, $x1 + $this->_x, $this->_height-($this->_bottomMargin/2)-10 + $this->_y, $this->_values[$i-1]["value"], $lineColor); 

         }

         // Print out the label of the bar.

         if ($this->_showLabels)

         {

            Imagestring($image, 2, $x1 + $this->_x, $this->_height-($this->_bottomMargin/2) + $this->_y, $this->_values[$i-1]["label"], $lineColor); 

         }

      }

      // draw the border box

      if ($this->_showOuterBox)

      {

         ImageRectangle($image, $this->_leftMargin + $this->_x, $this->_topMargin + $this->_y, $this->_width - $this->_rightMargin + $this->_barSpacing + $this->_x, $this->_height - $this->_bottomMargin + $this->_y, $lineColor);

      }

   }

}

?>