PHP 生成缩略图的类_PHP教程

php代码

/**

* 功能:生成缩略图

* 作者:phpox

立即学习“PHP免费学习笔记（深入）”；

* 日期:Thu May 17 09:57:05 CST 2007

*/

class CreatMiniature

{

迦恩计算机资源网源码(图书销售类)

采用三层架构开发，前台集成了产品在线展示，用户注册、在线调查、在线投稿后台有类别管理\图书管理\订单管理\会员管理\配送范围管理\邮件列表\广告管理\友情链接管理等后台添加图书时自动生成缩略图和文字水印主要参考了petshop的设计架构、使用了Asp.net2.0中很多MemberShip、master等新功能后台管理地址/web/admin/ 超级管理员账号密码均为aspx1特别提示：该系统需要

下载

//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

{

$ftoW=$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

{

$ctoH=$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

{

$ftoW=$toW;

$ftoH=$ftoW*($this->srcH/$this->srcW);

}