php生成圖片縮略圖代碼類

生成多種類型的縮略圖

<?php
/***
作者：落夢天蝎（beluckly）完成時間：2006-12-18
類名：CreatMiniature功能：生成多種類型的縮略圖
基本參數：$srcFile,$echoType方法用到的參數：
                $toFile,生成的文件
                $toW,生成的寬
                $toH,生成的高
                $bk1,背景顏色參數 以255為最高
                $bk2,背景顏色參數
                $bk3,背景顏色參數

*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
{
    //公共變量
    var $srcFile="";        //原圖
    var $echoType;            //輸出圖片類型，link--不保存為文件；file--保存為文件
    var $im="";                //臨時變量
    var $srcW="";            //原圖寬
    var $srcH="";            //原圖高

//設置變量及初始化
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庫不能使用GIF格式的圖片，請使用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庫不能使用jpeg格式的圖片，請使用其它格式的圖片！<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); 
}

//生成扭曲型縮圖
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);
}

//生成按比例縮放的縮圖
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);
    }
}

//生成最小裁剪后的縮圖
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);
}

//生成背景填充的縮圖
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, $bk3);        //填充的背景顏色
    ImageFilledRectangle($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;
}

//輸出圖片，link---只輸出，不保存文件。file--保存為文件
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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