path: root/libs/pChart/class/pImage.class.php

<?php
 /*
     pDraw - pChart core class

     Version     : 2.1.4
     Made by     : Jean-Damien POGOLOTTI
     Last Update : 19/01/2014

     This file can be distributed under the license you can find at :

                       http://www.pchart.net/license

     You can find the whole class documentation on the pChart web site.
 */

 /* The GD extension is mandatory */
 if (!extension_loaded('gd') && !extension_loaded('gd2'))
  {
   echo "GD extension must be loaded. \r\n";
   exit();
  }

 /* Image map handling */
 define("IMAGE_MAP_STORAGE_FILE"	, 680001);
 define("IMAGE_MAP_STORAGE_SESSION"	, 680002);

 /* Last generated chart layout */
 define("CHART_LAST_LAYOUT_REGULAR"	, 680011);
 define("CHART_LAST_LAYOUT_STACKED"	, 680012);

 /* ImageMap string delimiter */
 define("IMAGE_MAP_DELIMITER"		, chr(1));

 class pImage extends pDraw
  {
   /* Image settings, size, quality, .. */
   var $XSize		= NULL;				// Width of the picture
   var $YSize		= NULL;				// Height of the picture
   var $Picture		= NULL;				// GD picture object
   var $Antialias	= TRUE;				// Turn antialias on or off
   var $AntialiasQuality  = 0;				// Quality of the antialiasing implementation (0-1)
   var $Mask		= "";				// Already drawn pixels mask (Filled circle implementation)
   var $TransparentBackground = FALSE;			// Just to know if we need to flush the alpha channels when rendering

   /* Graph area settings */
   var $GraphAreaX1	= NULL;				// Graph area X origin
   var $GraphAreaY1	= NULL;				// Graph area Y origin
   var $GraphAreaX2	= NULL;				// Graph area bottom right X position
   var $GraphAreaY2	= NULL;				// Graph area bottom right Y position

   /* Scale settings */
   var $ScaleMinDivHeight = 20;				// Minimum height for scame divs

   /* Font properties */
   var $FontName	= "fonts/GeosansLight.ttf";	// Default font file
   var $FontSize	= 12;				// Default font size
   var $FontBox		= NULL;				// Return the bounding box of the last written string
   var $FontColorR	= 0;				// Default color settings
   var $FontColorG	= 0;				// Default color settings
   var $FontColorB	= 0;				// Default color settings
   var $FontColorA	= 100;				// Default transparency

   /* Shadow properties */
   var $Shadow		= FALSE;			// Turn shadows on or off
   var $ShadowX		= NULL;				// X Offset of the shadow
   var $ShadowY		= NULL;				// Y Offset of the shadow
   var $ShadowR		= NULL;				// R component of the shadow
   var $ShadowG		= NULL;				// G component of the shadow
   var $ShadowB		= NULL;				// B component of the shadow
   var $Shadowa		= NULL;				// Alpha level of the shadow

   /* Image map */
   var $ImageMap	= NULL;				// Aray containing the image map
   var $ImageMapIndex	= "pChart";			// Name of the session array
   var $ImageMapStorageMode = NULL;			// Save the current imagemap storage mode
   var $ImageMapAutoDelete  = TRUE;			// Automatic deletion of the image map temp files

   /* Data Set */
   var $DataSet		= NULL;				// Attached dataset

   /* Last generated chart info */
   var $LastChartLayout	= CHART_LAST_LAYOUT_REGULAR;	// Last layout : regular or stacked

   /* Class constructor */
   function pImage($XSize,$YSize,$DataSet=NULL,$TransparentBackground=FALSE)
    {
     $this->TransparentBackground = $TransparentBackground;

     if ( $DataSet != NULL ) { $this->DataSet = $DataSet; }

     $this->XSize   = $XSize;
     $this->YSize   = $YSize;
     $this->Picture = imagecreatetruecolor($XSize,$YSize);

     if ( $this->TransparentBackground )
      {
       imagealphablending($this->Picture,FALSE);
       imagefilledrectangle($this->Picture, 0,0,$XSize, $YSize, imagecolorallocatealpha($this->Picture, 255, 255, 255, 127));
       imagealphablending($this->Picture,TRUE);
       imagesavealpha($this->Picture,true); 
      }
     else
      {
       $C_White = $this->AllocateColor($this->Picture,255,255,255);
       imagefilledrectangle($this->Picture,0,0,$XSize,$YSize,$C_White);
      }
    }

   /* Enable / Disable and set shadow properties */
   function setShadow($Enabled=TRUE,$Format="")
    {
     $X	    = isset($Format["X"]) ? $Format["X"] : 2;
     $Y	    = isset($Format["Y"]) ? $Format["Y"] : 2;
     $R	    = isset($Format["R"]) ? $Format["R"] : 0;
     $G	    = isset($Format["G"]) ? $Format["G"] : 0;
     $B	    = isset($Format["B"]) ? $Format["B"] : 0;
     $Alpha = isset($Format["Alpha"]) ? $Format["Alpha"] : 10;

     $this->Shadow  = $Enabled;
     $this->ShadowX = $X;
     $this->ShadowY = $Y;
     $this->ShadowR = $R;
     $this->ShadowG = $G;
     $this->ShadowB = $B;
     $this->Shadowa = $Alpha;
    }

   /* Set the graph area position */
   function setGraphArea($X1,$Y1,$X2,$Y2)
    {
     if ( $X2 < $X1 || $X1 == $X2 || $Y2 < $Y1 || $Y1 == $Y2 ) { return(-1); }

     $this->GraphAreaX1 = $X1; $this->DataSet->Data["GraphArea"]["X1"] = $X1;
     $this->GraphAreaY1 = $Y1; $this->DataSet->Data["GraphArea"]["Y1"] = $Y1;
     $this->GraphAreaX2 = $X2; $this->DataSet->Data["GraphArea"]["X2"] = $X2;
     $this->GraphAreaY2 = $Y2; $this->DataSet->Data["GraphArea"]["Y2"] = $Y2;
    }

   /* Return the width of the picture */
   function getWidth()
    { return($this->XSize); }

   /* Return the heigth of the picture */
   function getHeight()
    { return($this->YSize); }

   /* Render the picture to a file */
   function render($FileName)
    {
     if ( $this->TransparentBackground ) { imagealphablending($this->Picture,false); imagesavealpha($this->Picture,true); }
     imagepng($this->Picture,$FileName);
    }

   /* Render the picture to a web browser stream */
   function stroke($BrowserExpire=FALSE)
    {
     if ( $this->TransparentBackground ) { imagealphablending($this->Picture,false); imagesavealpha($this->Picture,true); }

     if ( $BrowserExpire )
      {
       header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
       header("Cache-Control: no-cache");
       header("Pragma: no-cache");
      }

     header('Content-type: image/png');
     imagepng($this->Picture);
    }

   /* Automatic output method based on the calling interface */
   function autoOutput($FileName="output.png")
    {
     if (php_sapi_name() == "cli")
      $this->Render($FileName);
     else
      $this->Stroke();
    }

   /* Return the length between two points */
   function getLength($X1,$Y1,$X2,$Y2)
    { return(sqrt(pow(max($X1,$X2)-min($X1,$X2),2)+pow(max($Y1,$Y2)-min($Y1,$Y2),2))); }

   /* Return the orientation of a line */
   function getAngle($X1,$Y1,$X2,$Y2)
    {
     $Opposite = $Y2 - $Y1; $Adjacent = $X2 - $X1;$Angle = rad2deg(atan2($Opposite,$Adjacent));
     if ($Angle > 0) { return($Angle); } else { return(360-abs($Angle)); }
    }

   /* Return the surrounding box of text area */
   function getTextBox_deprecated($X,$Y,$FontName,$FontSize,$Angle,$Text)
    {
     $Size    = imagettfbbox($FontSize,$Angle,$FontName,$this->getEncodedText($Text));
     $Width   = $this->getLength($Size[0],$Size[1],$Size[2],$Size[3])+1;
     $Height  = $this->getLength($Size[2],$Size[3],$Size[4],$Size[5])+1;

     $RealPos[0]["X"] = $X; $RealPos[0]["Y"] = $Y;
     $RealPos[1]["X"] = cos((360-$Angle)*PI/180)*$Width + $RealPos[0]["X"]; $RealPos[1]["Y"] = sin((360-$Angle)*PI/180)*$Width + $RealPos[0]["Y"];
     $RealPos[2]["X"] = cos((270-$Angle)*PI/180)*$Height + $RealPos[1]["X"]; $RealPos[2]["Y"] = sin((270-$Angle)*PI/180)*$Height + $RealPos[1]["Y"];
     $RealPos[3]["X"] = cos((180-$Angle)*PI/180)*$Width + $RealPos[2]["X"]; $RealPos[3]["Y"] = sin((180-$Angle)*PI/180)*$Width + $RealPos[2]["Y"];

     $RealPos[TEXT_ALIGN_BOTTOMLEFT]["X"] = $RealPos[0]["X"];	$RealPos[TEXT_ALIGN_BOTTOMLEFT]["Y"] = $RealPos[0]["Y"];
     $RealPos[TEXT_ALIGN_BOTTOMRIGHT]["X"] = $RealPos[1]["X"];	$RealPos[TEXT_ALIGN_BOTTOMRIGHT]["Y"] = $RealPos[1]["Y"];

     return($RealPos);
    }

     function getEncodedText($text)
     {
         $gdinfo = gd_info();
         if (!empty($gdinfo['JIS-mapped Japanese Font Support'])) {
             return mb_convert_encoding($text, "SJIS", "UTF-8");
         }

         return $text;
     }

   /* Return the surrounding box of text area */
   function getTextBox($X,$Y,$FontName,$FontSize,$Angle,$Text)
    {
     $coords = imagettfbbox($FontSize, 0, $FontName, $this->getEncodedText($Text));

     $a = deg2rad($Angle); $ca = cos($a); $sa = sin($a); $RealPos = array();
     for($i = 0; $i < 7; $i += 2)
      {
       $RealPos[$i/2]["X"] = $X + round($coords[$i] * $ca + $coords[$i+1] * $sa);
       $RealPos[$i/2]["Y"] = $Y + round($coords[$i+1] * $ca - $coords[$i] * $sa);
      }

     $RealPos[TEXT_ALIGN_BOTTOMLEFT]["X"]	= $RealPos[0]["X"];	$RealPos[TEXT_ALIGN_BOTTOMLEFT]["Y"]	= $RealPos[0]["Y"];
     $RealPos[TEXT_ALIGN_BOTTOMRIGHT]["X"]	= $RealPos[1]["X"];	$RealPos[TEXT_ALIGN_BOTTOMRIGHT]["Y"]	= $RealPos[1]["Y"];
     $RealPos[TEXT_ALIGN_TOPLEFT]["X"]		= $RealPos[3]["X"];	$RealPos[TEXT_ALIGN_TOPLEFT]["Y"]	= $RealPos[3]["Y"];
     $RealPos[TEXT_ALIGN_TOPRIGHT]["X"]		= $RealPos[2]["X"];	$RealPos[TEXT_ALIGN_TOPRIGHT]["Y"]	= $RealPos[2]["Y"];
     $RealPos[TEXT_ALIGN_BOTTOMMIDDLE]["X"]	= ($RealPos[1]["X"]-$RealPos[0]["X"])/2+$RealPos[0]["X"];	$RealPos[TEXT_ALIGN_BOTTOMMIDDLE]["Y"]	= ($RealPos[0]["Y"]-$RealPos[1]["Y"])/2+$RealPos[1]["Y"];
     $RealPos[TEXT_ALIGN_TOPMIDDLE]["X"]	= ($RealPos[2]["X"]-$RealPos[3]["X"])/2+$RealPos[3]["X"];	$RealPos[TEXT_ALIGN_TOPMIDDLE]["Y"]	= ($RealPos[3]["Y"]-$RealPos[2]["Y"])/2+$RealPos[2]["Y"];
     $RealPos[TEXT_ALIGN_MIDDLELEFT]["X"]	= ($RealPos[0]["X"]-$RealPos[3]["X"])/2+$RealPos[3]["X"];	$RealPos[TEXT_ALIGN_MIDDLELEFT]["Y"]	= ($RealPos[0]["Y"]-$RealPos[3]["Y"])/2+$RealPos[3]["Y"];
     $RealPos[TEXT_ALIGN_MIDDLERIGHT]["X"]	= ($RealPos[1]["X"]-$RealPos[2]["X"])/2+$RealPos[2]["X"];	$RealPos[TEXT_ALIGN_MIDDLERIGHT]["Y"]	= ($RealPos[1]["Y"]-$RealPos[2]["Y"])/2+$RealPos[2]["Y"];
     $RealPos[TEXT_ALIGN_MIDDLEMIDDLE]["X"]	= ($RealPos[1]["X"]-$RealPos[3]["X"])/2+$RealPos[3]["X"];	$RealPos[TEXT_ALIGN_MIDDLEMIDDLE]["Y"]	= ($RealPos[0]["Y"]-$RealPos[2]["Y"])/2+$RealPos[2]["Y"];

     return($RealPos);
    }

   /* Set current font properties */
   function setFontProperties($Format="")
    {
     $R		= isset($Format["R"]) ? $Format["R"] : -1;
     $G		= isset($Format["G"]) ? $Format["G"] : -1;
     $B		= isset($Format["B"]) ? $Format["B"] : -1;
     $Alpha	= isset($Format["Alpha"]) ? $Format["Alpha"] : 100;
     $FontName	= isset($Format["FontName"]) ? $Format["FontName"] : NULL;
     $FontSize	= isset($Format["FontSize"]) ? $Format["FontSize"] : NULL;

     if ( $R != -1)       {  $this->FontColorR = $R; }
     if ( $G != -1)       {  $this->FontColorG = $G; }
     if ( $B != -1)       {  $this->FontColorB = $B; }
     if ( $Alpha != NULL) {  $this->FontColorA = $Alpha; }

     if ( $FontName != NULL  )
      $this->FontName = $FontName;
 
     if ( $FontSize != NULL  )
      $this->FontSize = $FontSize;
    }

   /* Returns the 1st decimal values (used to correct AA bugs) */
   function getFirstDecimal($Value)
    {
     $Values = preg_split("/\./",$Value);
     if ( isset($Values[1]) ) { return(substr($Values[1],0,1)); } else { return(0); }
    }

   /* Attach a dataset to your pChart Object */
   function setDataSet(&$DataSet)
    { $this->DataSet = $DataSet; }

   /* Print attached dataset contents to STDOUT */
   function printDataSet()
    { print_r($this->DataSet); }

   /* Initialise the image map methods */
   function initialiseImageMap($Name="pChart",$StorageMode=IMAGE_MAP_STORAGE_SESSION,$UniqueID="imageMap",$StorageFolder="tmp")
    {
     $this->ImageMapIndex 		= $Name;
     $this->ImageMapStorageMode		= $StorageMode;

     if ($StorageMode == IMAGE_MAP_STORAGE_SESSION)
      {
       if(!isset($_SESSION)) { session_start(); }
       $_SESSION[$this->ImageMapIndex]    = NULL;
      }
     elseif($StorageMode == IMAGE_MAP_STORAGE_FILE)
      {
       $this->ImageMapFileName 		= $UniqueID;
       $this->ImageMapStorageFolder	= $StorageFolder;

       if (file_exists($StorageFolder."/".$UniqueID.".map")) { unlink($StorageFolder."/".$UniqueID.".map"); }
      }
    }

   /* Add a zone to the image map */
   function addToImageMap($Type,$Plots,$Color=NULL,$Title=NULL,$Message=NULL,$HTMLEncode=FALSE)
    {
     if ( $this->ImageMapStorageMode == NULL ) { $this->initialiseImageMap(); }

     /* Encode the characters in the imagemap in HTML standards */
     $Title   = str_replace("&#8364;","\u20AC",$Title);
     $Title   = htmlentities($Title,ENT_QUOTES,"ISO-8859-15");
     if ( $HTMLEncode )
      {
       $Message = htmlentities($Message,ENT_QUOTES,"ISO-8859-15");
       $Message = str_replace("&lt;","<",$Message);
       $Message = str_replace("&gt;",">",$Message);
      }

     if ( $this->ImageMapStorageMode == IMAGE_MAP_STORAGE_SESSION )
      {
       if(!isset($_SESSION)) { $this->initialiseImageMap(); }
       $_SESSION[$this->ImageMapIndex][] = array($Type,$Plots,$Color,$Title,$Message);
      }
     elseif($this->ImageMapStorageMode == IMAGE_MAP_STORAGE_FILE)
      {
       $Handle = fopen($this->ImageMapStorageFolder."/".$this->ImageMapFileName.".map", 'a');
       fwrite($Handle, $Type.IMAGE_MAP_DELIMITER.$Plots.IMAGE_MAP_DELIMITER.$Color.IMAGE_MAP_DELIMITER.$Title.IMAGE_MAP_DELIMITER.$Message."\r\n");
       fclose($Handle);
      }
    }

   /* Remove VOID values from an imagemap custom values array */
   function removeVOIDFromArray($SerieName, $Values)
    {
     if ( !isset($this->DataSet->Data["Series"][$SerieName]) ) { return(-1); }

     $Result = "";
     foreach($this->DataSet->Data["Series"][$SerieName]["Data"] as $Key => $Value)
      { if ( $Value != VOID && isset($Values[$Key]) ) { $Result[] = $Values[$Key]; } }
     return($Result);
    }

   /* Replace the title of one image map serie */
   function replaceImageMapTitle($OldTitle, $NewTitle)
    {
     if ( $this->ImageMapStorageMode == NULL ) { return(-1); }

     if ( is_array($NewTitle) ) { $NewTitle = $this->removeVOIDFromArray($OldTitle, $NewTitle); }
 
     if ( $this->ImageMapStorageMode == IMAGE_MAP_STORAGE_SESSION )
      {
       if(!isset($_SESSION)) { return(-1); }
       if ( is_array($NewTitle) )
        { $ID = 0; foreach($_SESSION[$this->ImageMapIndex] as $Key => $Settings) { if ( $Settings[3] == $OldTitle && isset($NewTitle[$ID])) { $_SESSION[$this->ImageMapIndex][$Key][3] = $NewTitle[$ID]; $ID++; } } }
       else
        { foreach($_SESSION[$this->ImageMapIndex] as $Key => $Settings) { if ( $Settings[3] == $OldTitle ) { $_SESSION[$this->ImageMapIndex][$Key][3] = $NewTitle; } } }
      }
     elseif( $this->ImageMapStorageMode == IMAGE_MAP_STORAGE_FILE )
      {
       $TempArray = "";
       $Handle    = @fopen($this->ImageMapStorageFolder."/".$this->ImageMapFileName.".map", "r");
       if ($Handle)
        {
         while (($Buffer = fgets($Handle, 4096)) !== false)
          {
           $Fields      = preg_split("/".IMAGE_MAP_DELIMITER."/",str_replace(array(chr(10),chr(13)),"",$Buffer));
           $TempArray[] = array($Fields[0],$Fields[1],$Fields[2],$Fields[3],$Fields[4]);
          }
         fclose($Handle);

         if ( is_array($NewTitle) )
          { $ID = 0; foreach($TempArray as $Key => $Settings) { if ( $Settings[3] == $OldTitle && isset($NewTitle[$ID]) ) { $TempArray[$Key][3] = $NewTitle[$ID]; $ID++; } } }
         else
          { foreach($TempArray as $Key => $Settings) { if ( $Settings[3] == $OldTitle ) { $TempArray[$Key][3] = $NewTitle; } } }

         $Handle = fopen($this->ImageMapStorageFolder."/".$this->ImageMapFileName.".map", 'w');
         foreach($TempArray as $Key => $Settings)
          { fwrite($Handle, $Settings[0].IMAGE_MAP_DELIMITER.$Settings[1].IMAGE_MAP_DELIMITER.$Settings[2].IMAGE_MAP_DELIMITER.$Settings[3].IMAGE_MAP_DELIMITER.$Settings[4]."\r\n"); }
         fclose($Handle);
        }
      }
    }

   /* Replace the values of the image map contents */
   function replaceImageMapValues($Title, $Values)
    {
     if ( $this->ImageMapStorageMode == NULL ) { return(-1); }

     $Values = $this->removeVOIDFromArray($Title, $Values);
     $ID = 0; 
     if ( $this->ImageMapStorageMode == IMAGE_MAP_STORAGE_SESSION )
      {
       if(!isset($_SESSION)) { return(-1); }
       foreach($_SESSION[$this->ImageMapIndex] as $Key => $Settings) { if ( $Settings[3] == $Title ) { if ( isset($Values[$ID]) ) { $_SESSION[$this->ImageMapIndex][$Key][4] = $Values[$ID]; } $ID++; } }
      }
     elseif( $this->ImageMapStorageMode == IMAGE_MAP_STORAGE_FILE )
      {
       $TempArray = "";
       $Handle    = @fopen($this->ImageMapStorageFolder."/".$this->ImageMapFileName.".map", "r");
       if ($Handle)
        {
         while (($Buffer = fgets($Handle, 4096)) !== false)
          {
           $Fields      = preg_split("/".IMAGE_MAP_DELIMITER."/",str_replace(array(chr(10),chr(13)),"",$Buffer));
           $TempArray[] = array($Fields[0],$Fields[1],$Fields[2],$Fields[3],$Fields[4]);
          }
         fclose($Handle);

         foreach($TempArray as $Key => $Settings) { if ( $Settings[3] == $Title ) { if ( isset($Values[$ID]) ) { $TempArray[$Key][4] = $Values[$ID]; } $ID++; } }

         $Handle = fopen($this->ImageMapStorageFolder."/".$this->ImageMapFileName.".map", 'w');
         foreach($TempArray as $Key => $Settings)
          { fwrite($Handle, $Settings[0].IMAGE_MAP_DELIMITER.$Settings[1].IMAGE_MAP_DELIMITER.$Settings[2].IMAGE_MAP_DELIMITER.$Settings[3].IMAGE_MAP_DELIMITER.$Settings[4]."\r\n"); }
         fclose($Handle);
        }
      }
    }

   /* Dump the image map */
   function dumpImageMap($Name="pChart",$StorageMode=IMAGE_MAP_STORAGE_SESSION,$UniqueID="imageMap",$StorageFolder="tmp")
    {
     $this->ImageMapIndex 		= $Name;
     $this->ImageMapStorageMode		= $StorageMode;

     if ( $this->ImageMapStorageMode == IMAGE_MAP_STORAGE_SESSION )
      {
       if(!isset($_SESSION)) { session_start(); }
       if ( $_SESSION[$Name] != NULL )
        {
         foreach($_SESSION[$Name] as $Key => $Params)
          { echo $Params[0].IMAGE_MAP_DELIMITER.$Params[1].IMAGE_MAP_DELIMITER.$Params[2].IMAGE_MAP_DELIMITER.$Params[3].IMAGE_MAP_DELIMITER.$Params[4]."\r\n"; }
        }
      }
     elseif( $this->ImageMapStorageMode == IMAGE_MAP_STORAGE_FILE )
      {
       if (file_exists($StorageFolder."/".$UniqueID.".map"))
        {
         $Handle = @fopen($StorageFolder."/".$UniqueID.".map", "r");
         if ($Handle) { while (($Buffer = fgets($Handle, 4096)) !== false) { echo $Buffer; } }
         fclose($Handle);

         if ( $this->ImageMapAutoDelete ) { unlink($StorageFolder."/".$UniqueID.".map"); }
        }
      }

     /* When the image map is returned to the client, the script ends */
     exit();
    }

   /* Return the HTML converted color from the RGB composite values */
   function toHTMLColor($R,$G,$B)
    {
     $R=intval($R); $G=intval($G); $B=intval($B);
     $R=dechex($R<0?0:($R>255?255:$R)); $G=dechex($G<0?0:($G>255?255:$G));$B=dechex($B<0?0:($B>255?255:$B));
     $Color="#".(strlen($R) < 2?'0':'').$R; $Color.=(strlen($G) < 2?'0':'').$G; $Color.= (strlen($B) < 2?'0':'').$B;
     return($Color);
    }

   /* Reverse an array of points */
   function reversePlots($Plots)
    {
     $Result = "";
     for($i=count($Plots)-2;$i>=0;$i=$i-2) { $Result[] = $Plots[$i]; $Result[] = $Plots[$i+1]; }
     return($Result);
    }

   /* Mirror Effect */
   function drawAreaMirror($X,$Y,$Width,$Height,$Format="")
    {
     $StartAlpha	= isset($Format["StartAlpha"]) ? $Format["StartAlpha"] : 80;
     $EndAlpha		= isset($Format["EndAlpha"]) ? $Format["EndAlpha"] : 0;

     $AlphaStep = ($StartAlpha-$EndAlpha)/$Height;

     $Picture = imagecreatetruecolor($this->XSize,$this->YSize);
     imagecopy($Picture,$this->Picture,0,0,0,0,$this->XSize,$this->YSize);
     
     for($i=1;$i<=$Height;$i++)
      {
       if ( $Y+($i-1) < $this->YSize && $Y-$i > 0 ) { imagecopymerge($Picture,$this->Picture,$X,$Y+($i-1),$X,$Y-$i,$Width,1,$StartAlpha-$AlphaStep*$i); }
      }

     imagecopy($this->Picture,$Picture,0,0,0,0,$this->XSize,$this->YSize);
    }
  }
?>