php生成缩略图的类代码

<?php /*
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($this->im,$toH,$this->srcW,$this->srcH);
return $this->EchoImage($cImg,$toFile);
ImageDestroy($cImg);
} //生成按比例缩放的缩图
function Prorate($toFile,$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,$ftoH,$toFile);
ImageDestroy($cImg);
}
else
{
$cImg=$this->CreatImage($this->im,$this->srcH,$toFile);
ImageDestroy($cImg);
}
} //生成最小裁剪后的缩图
function Cut($toFile,$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,$ctoH,$this->srcH);
$cImg=$this->CreatImage($allImg,($ctoW-$toW)/2,($ctoH-$toH)/2,$toH);
return $this->EchoImage($cImg,$toFile);
ImageDestroy($cImg);
ImageDestroy($allImg);
} //生成背景填充的缩图
function BackFill($toFile,$bk1=255,$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,$backcolor);
if($this->srcW>$toW||$this->srcH>$toH)
{
$proImg=$this->CreatImage($this->im,$this->srcH);
if($ftoW<$toW)
{
ImageCopy($cImg,$proImg,($toW-$ftoW)/2,$ftoH);
}
else if($ftoH<$toH)
{
ImageCopy($cImg,($toH-$ftoH)/2,$ftoH);
}
else
{
ImageCopy($cImg,$ftoH);
}
}
else
{
ImageCopyMerge($cImg,$this->im,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,$img,$srcImgH);
else
{
$creatImg=ImageCreate($creatW,$creatH);
ImageCopyResized($creatImg,$srcImgH);
}
}
else
{
$creatImg=ImageCreate($creatW,$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;
}
}
}
?>

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!