< ?php

 /***************************************

 *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)

     {

         $this->srcFile=$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)

              {

                  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);

              }

              */

             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;

         }

     }

 }

 ?>