标题：php生成缩略图的类
出处：沧海一粟
时间：Mon, 11 May 2009 13:14:15 +0000
作者：jed
地址：http://www.dzhope.com/post/618/

内容：


<?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;    
        }    
    }    
}    
?>   






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