PHP生成缩略图的类_PHP教程

php代码

/** 

* 功能:生成缩略图 

* 作者:phpox 

* 日期:Thu May 17 09:57:05 CST 2007 

*/ 

class CreatMiniature  

{  

    //公共变量  

    var $srcFile="";        //原图  

    var $echoType;            //输出图片类型，link--不保存为文件；file--保存为文件  

    var $im="";                //临时变量  

    var $srcW="";            //原图宽  

    var $srcH="";            //原图高  

    //设置变量及初始化  

    function SetVar($srcFile,$echoType)  

    {  

        if (!file_exists($srcFile)){  

            echo 源图片文件不存在!;  

            exit();  

        }  

        $this->srcFile=$srcFile;  

        $this->echoType=$echoType;  

        $info = "";  

        $data = GetImageSize($this->srcFile,$info);  

        switch ($data[2])   

        {  

         case 1:  

           if(!function_exists("imagecreatefromgif")){  

            echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！返回";  

            exit();  

           }  

           $this->im = ImageCreateFromGIF($this->srcFile);  

           break;  

        case 2:  

          if(!function_exists("imagecreatefromjpeg")){  

           echo "你的GD库不能使用jpeg格式的图片，请使用其它格式的图片！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

        {  

            $ftoW=$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-&g