PHP generates image thumbnail code class

Generate multiple types of thumbnails

/***************************************
*Author: Dreaming Scorpio (beluckly)
*Complete Time: 2006-12-18
*Class name: CreatMiniature
*Function: Generate multiple types of thumbnails
*Basic parameters: $srcFile, $echoType
*Parameters used in the method:
$toFile, generated file
 $toW, the generated width
 $toH, the generated height
 $bk1, the background color parameter is 255 as the highest
 $bk2, the background color parameter
 $bk3, the background color parameter

*Example:

 include("thumb. php");
 $cm=new CreatMiniature();
 $cm->SetVar("1.jpg","file");
 $cm->Distortion("dis_bei.jpg",150,200);
 $cm->Prorate("pro_bei.jpg",150,200);
 $cm->Cut("cut_bei.jpg",150,200);
 $cm->BackFill("fill_bei.jpg",150,200);

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

class CreatMiniature
{
 //Public variable
 var $srcFile=""; //Original image
 var $echoType; //Output image type , link--do not save as a file; file--save as a file
 var $im=""; //Temporary variable
 var $srcW=""; //Original image width
 var $srcH=""; // Original image height

 //Set variables and initialize
 function SetVar($srcFile,$echoType)
 {
 $this->srcFile=$srcFile;
 $this->echoType=$echoType;

 $info = "";
 $data = GetImageSize($this->srcFile,$info);
 switch ($data[2])
 {
 case 1:
 if(!function_exists("imagecreatefromgif")){
 echo " Your GD library cannot use GIF format images, please use Jpeg or PNG format! Return";
 exit();
 }
 $this->im = ImageCreateFromGIF($this->srcFile);
 break;
 case 2:
 if(!function_exists("imagecreatefromjpeg")){
 echo "Your GD library cannot use images in jpeg format , please use pictures in other formats!返回";
           exit();
          }
          $this->im = ImageCreateFromJpeg($this->srcFile);
          break;
        case 3:
          $this->im = ImageCreateFromPNG($this->srcFile);
          break;
      }
      $this->srcW=ImageSX($this->im);
      $this->srcH=ImageSY($this->im);
    }

    //生成扭曲型缩图
    function Distortion($toFile,$toW,$toH)
    {
        $cImg=$this->CreatImage($this->im,$toW,$toH,0,0,0,0,$this->srcW,$this->srcH);
        return $this->EchoImage($cImg,$toFile);
        ImageDestroy($cImg);
    }

    //生成按比例缩放的缩图
    function Prorate($toFile,$toW,$toH)
    {
        $toWH=$toW/$toH;
        $srcWH=$this->srcW/$this->srcH;
        if($toWH< =$srcWH)
        {
            $ftoW=$toW;
            $ftoH=$ftoW*($this->srcH/$this->srcW);
        }
        else
        {
              $ftoH=$toH;
              $ftoW=$ftoH*($this->srcW/$this->srcH);
        }
        if($this->srcW>$toW||$this->srcH>$toH)
        {
            $cImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);
            return $this->EchoImage($cImg,$toFile);
            ImageDestroy($cImg);
        }
        else
        {
            $cImg=$this->CreatImage($this->im,$this->srcW,$this->srcH,0,0,0,0,$this->srcW,$this->srcH);
            return $this->EchoImage($cImg,$toFile);
            ImageDestroy($cImg);
        }
    }

    //生成最小裁剪后的缩图
    function Cut($toFile,$toW,$toH)
    {
          $toWH=$toW/$toH;
          $srcWH=$this->srcW/$this->srcH;
          if($toWH< =$srcWH)
          {
               $ctoH=$toH;
               $ctoW=$ctoH*($this->srcW/$this->srcH);
          }
          else
          {
              $ctoW=$toW;
              $ctoH=$ctoW*($this->srcH/$this->srcW);
          }
        $allImg=$this->CreatImage($this->im,$ctoW,$ctoH,0,0,0,0,$this->srcW,$this->srcH);
        $cImg=$this->CreatImage($allImg,$toW,$toH,0,0,($ctoW-$toW)/2,($ctoH-$toH)/2,$toW,$toH);
        return $this->EchoImage($cImg,$toFile);
        ImageDestroy($cImg);
        ImageDestroy($allImg);
    }

    //生成背景填充的缩图
    function BackFill($toFile,$toW,$toH,$bk1=255,$bk2=255,$bk3=255)
    {
        $toWH=$toW/$toH;
        $srcWH=$this->srcW/$this->srcH;
        if($toWH< =$srcWH)
        {
            $ftoW=$toW;
            $ftoH=$ftoW*($this->srcH/$this->srcW);
        }
        else
        {
              $ftoH=$toH;
              $ftoW=$ftoH*($this->srcW/$this->srcH);
        }
        if(function_exists("imagecreatetruecolor"))
        {
            @$cImg=ImageCreateTrueColor($toW,$toH);
            if(!$cImg)
            {
                $cImg=ImageCreate($toW,$toH);
            }
        }
        else
        {
            $cImg=ImageCreate($toW,$toH);
        }
        $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3);        //填充的背景颜色
        ImageFilledRectangle($cImg,0,0,$toW,$toH,$backcolor);
        if($this->srcW>$toW||$this->srcH>$toH)
        {
            $proImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);
            /*
             if($ftoW< $toW)
             {
                 ImageCopyMerge($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH,100);
             }
             else if($ftoH<$toH)
             {
                 ImageCopyMerge($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);
             }
             */
            if($ftoW<$toW)
            {
                 ImageCopy($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH);
            }
            else if($ftoH<$toH)
            {
                 ImageCopy($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH);
            }
            else
            {
                 ImageCopy($cImg,$proImg,0,0,0,0,$ftoW,$ftoH);
            }
        }
        else
        {
             ImageCopyMerge($cImg,$this->im,($toW-$ftoW)/2,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);
        }
        return $this->EchoImage($cImg,$toFile);
        ImageDestroy($cImg);
    }

    function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH)
    {
        if(function_exists("imagecreatetruecolor"))
        {
            @$creatImg = ImageCreateTrueColor($creatW,$creatH);
            if($creatImg)
                ImageCopyResampled($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
            else
            {
                $creatImg=ImageCreate($creatW,$creatH);
                ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
            }
         }
         else
         {
            $creatImg=ImageCreate($creatW,$creatH);
            ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
         }
         return $creatImg;
    }

    //输出图片，link---只输出，不保存文件。file--保存为文件
    function EchoImage($img,$to_File)
    {
        switch($this->echoType)
        {
            case "link":
                if(function_exists('imagejpeg')) return ImageJpeg($img);
                else return ImagePNG($img);
                break;
            case "file":
                if(function_exists('imagejpeg')) return ImageJpeg($img,$to_File);
                else return ImagePNG($img,$to_File);
                break;
        }
    }

}
?>

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