PHP_生成缩略图

 

<?php



/**

* 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

*例子：

    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

{

    //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($toWH<=$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;

        }

    }

}

$cm=new CreatMiniature();

$cm->SetVar("1.jpg", "file");
$cm->cut("./small/1_samall.jpg", 200, 133);
//$cm->EchoImage($img,"./small/1_samall.jpg");



?>