/* Load a PNG file and draw it over the chart */
   function drawFromPNG($X,$Y,$FileName,$Format="")
    { $this->drawFromPicture(1,$FileName,$X,$Y,$Format); }

   /* Load a GIF file and draw it over the chart */
   function drawFromGIF($X,$Y,$FileName,$Format="")
    { $this->drawFromPicture(2,$FileName,$X,$Y,$Format); }

   /* Load a JPEG file and draw it over the chart */
   function drawFromJPG($X,$Y,$FileName,$Format="")
    { $this->drawFromPicture(3,$FileName,$X,$Y,$Format); }

   function getPicInfo($FileName)
    {
     $Infos  = getimagesize($FileName);
     $Width  = $Infos[0];
     $Height = $Infos[1];
     $Type   = $Infos["mime"];

     if ( $Type == "image/png") { $Type = 1; }
     if ( $Type == "image/gif") { $Type = 2; }
     if ( $Type == "image/jpeg ") { $Type = 3; }

     return(array($Width,$Height,$Type));
    }

   /* Generic loader function for external pictures */
   function drawFromPicture($PicType,$FileName,$X,$Y,$Format="")
    {
     if ( file_exists($FileName) )
      {
       list($Width,$Height) = $this->getPicInfo($FileName);

       if ( $PicType == 1 )
        { $Raster = imagecreatefrompng($FileName); }
       elseif ( $PicType == 2 )
        { $Raster = imagecreatefromgif($FileName); }
       elseif ( $PicType == 3 )
        { $Raster = imagecreatefromjpeg($FileName); }
       else
        { return(0); }

      
       if(isset($Format["Width"]) && $Format["Width"]<$Width) $Width = $Format["Width"];
       if(isset($Format["Height"]) && $Format["Height"]<$Height) $Height = $Format["Height"];
       
       if(isset($Format["OffsetX"]) && $Format["OffsetX"]<$Width) { $Xo = $Format["OffsetX"]; $Width-= $Xo;} else {$Xo = 0;}
       if(isset($Format["OffsetY"]) && $Format["OffsetY"]<$Height) { $Yo = $Format["OffsetY"]; $Height-= $Yo;} else {$Yo = 0;}
       
       $RestoreShadow = $this->Shadow;
       if ( $this->Shadow && $this->ShadowX != 0 && $this->ShadowY != 0 )
        {
         $this->Shadow = FALSE;
         if ( $PicType == 3 )
          $this->drawFilledRectangle($X+$this->ShadowX,$Y+$this->ShadowY,$X+$Width+$this->ShadowX,$Y+$Height+$this->ShadowY,array("R"=>$this->ShadowR,"G"=>$this->ShadowG,"B"=>$this->ShadowB,"Alpha"=>$this->Shadowa));
         else
          {
           $TranparentID = imagecolortransparent($Raster);
           for ($Xc=0;$Xc<=$Width-1;$Xc++)
            {
             for ($Yc=0;$Yc<=$Height-1;$Yc++)
              {
               $RGBa   = imagecolorat($Raster,$Xc,$Yc);
               $Values = imagecolorsforindex($Raster,$RGBa);
               if ( $Values["alpha"] < 120 )
                {
                 $AlphaFactor = floor(($this->Shadowa / 100) * ((100 / 127) * (127-$Values["alpha"])));
                 $this->drawAlphaPixel($X+$Xc+$this->ShadowX,$Y+$Yc+$this->ShadowY,$AlphaFactor,$this->ShadowR,$this->ShadowG,$this->ShadowB);
                }
              }
            }
          }
        }
       $this->Shadow = $RestoreShadow;

       imagecopy($this->Picture,$Raster,$X,$Y,$Xo,$Yo,$Width,$Height);
       imagedestroy($Raster);
      }
    }

       if(isset($Format["Width"]) && $Format["Width"]<$Width) $Width = $Format["Width"];
       if(isset($Format["Height"]) && $Format["Height"]<$Height) $Height = $Format["Height"];
       
       if(isset($Format["OffsetX"]) && $Format["OffsetX"]<$Width) { $Xo = $Format["OffsetX"]; $Width-= $Xo;} else {$Xo = 0;}
       if(isset($Format["OffsetY"]) && $Format["OffsetY"]<$Height) { $Yo = $Format["OffsetY"]; $Height-= $Yo;} else {$Yo = 0;}

   /* Load a PNG file and draw it over the chart */
   function drawFromPNG($X,$Y,$FileName,$Format="")
    { $this->drawFromPicture(1,$FileName,$X,$Y,$Format); }

   /* Load a GIF file and draw it over the chart */
   function drawFromGIF($X,$Y,$FileName,$Format="")
    { $this->drawFromPicture(2,$FileName,$X,$Y,$Format); }

   /* Load a JPEG file and draw it over the chart */
   function drawFromJPG($X,$Y,$FileName,$Format="")
    { $this->drawFromPicture(3,$FileName,$X,$Y,$Format); }
[...]
       imagecopy($this->Picture,$Raster,$X,$Y,$Xo,$Yo,$Width,$Height);

require("pChart/class/pDraw.class.php");
require("pChart/class/pImage.class.php");

$i = new pImage(734,200,null,TRUE);

$i->setShadow(TRUE);
$i->drawFromPNG(0, 0, "images/sunCloud.png",array("OffsetX"=>100));

$i->drawFromJPG(210, 0, "images/sunCloud.jpg",array("Width"=>200));

$i->drawFromJPG(420, 0, "images/sunCloud.jpg");
$i->setShadow(FALSE);
$i->stroke();