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PHP 生成缩略图的类

 2009-11-09 09:23:20 来源:WEB开发网   
核心提示:php代码<?php /** * 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 $ec

php代码

<?php  

 

/** 

* 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!<a href='javascript:go(-1);'>返回</a>";  

     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!<a href='Javascript:go(-1);'>返回</a>";  

    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)  

     {  

       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;  

   }  

   }  

}  

?> 

Tags:PHP 生成 缩略

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