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PHP生成缩略图的类

时间:2021-07-01 10:21:17 帮助过:6人阅读

php代码

 

/** 

* 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!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; 

  } 

  } 

} 

?>

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