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php生成缩略图类

© kekehu / 技术资源 / 2008.12.29 / 18:15 / 6249PV

例子:
if(move_uploaded_file($_FILES["icon"]["tmp_name"], S_ROOT.'./data/album/temp.jpg')){
      $cm->SetVar(S_ROOT.'./data/album/temp.jpg',"file");
      $cm->Prorate(S_ROOT.'./data/album/'.$space['uid'].'/'.$aid.'.jpg',110,110);
      if (is_file( S_ROOT.'./data/album/temp.jpg')){
        unlink(S_ROOT.'./data/album/temp.jpg');
        die(header("Location: cp.php?ac=album&aid=$aid" ));
      }
    }else{
      showmessage('no_privilege');
    }


/***************************************
*作者:落梦天蝎(beluckly)
*完成时间:2006-12-18
*类名:CreatMiniature
*功能:生成多种类型的缩略图
*基本参数:$srcFile,$echoType
*方法用到的参数:
                $toFile,生成的文件
                $toW,生成的宽
                $toH,生成的高
                $bk1,背景颜色参数 以255为最高
                $bk2,背景颜色参数
                $bk3,背景颜色参数
*例:
    include("creatminiature.php");
    $cm=new CreatMiniature();
    $cm->SetVar("bei1.jpg","file");
    $cm->Distortion("dis_bei.jpg",200,300);
    $cm->Prorate("pro_bei.jpg",200,300);
    $cm->Cut("cut_bei.jpg",200,300);
    $cm->BackFill("fill_bei.jpg",200,300);
***************************************/
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)
    {
        $this->srcFile=$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=$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,$ftoH,100);
             }
                else
                {
                      ImageCopyMerge($cImg,$proImg,0,0,0,0,$ftoW,$ftoH,100);
                }
        }
        else
        {
             ImageCopyMerge($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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