[PHP5]T.T.R 缩略图/截图 生成类！

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PHP代码:

<?php
/**
 *TTR缩略图\截图类
 *2007-09-23
 *[url]http://www.Gx3.cn[/url]
 *QQ:252319874
 *类实例：$a = ResizeImage::getInstance();
 *创建方法:$a->create(string imagename,int resizewidth,int resizeheight,[boolen cutmode],[int cutX],[int cutY])
 *可选参数说明：
 *cutmode，默认false：创建缩略图，true：剪裁图片
 *cutX,cutY:要截取原图片的，xy坐标以左上角为原点
**/

class ResizeImage
{
    private $type=null;
    private $width=0;
    private $height=0;
    private $resize_width=0;
    private $resize_height=0;
    private $cutX=0;
    private $cutY=0;
    private $cutmode=true;
    private $imagepath=null;
    private $savepath=null;
    private $uploadpath="uploadfile/";
    private $im;
    static $instance=null;
    private $resizeimge=null;
    
    private function __construct()
    {
        
    }
    
    public function create($imagepath,$resizewidth,$resizeheight,$cutmode=false,$x=0,$y=0)
    {
        $this->imagepath=$imagepath;
        $this->resize_width=$resizewidth;
        $this->resize_height=$resizeheight;
        $this->cutmode=$cutmode;
        $this->cutX=$x;
        $this->cutY=$y;
        $this->type=$this->getImageType();
        $this->initImage();
        $this->getImageDstPath();
        $this->width=$this->getImageX();
        $this->height=$this->getImageY();
        $this->createResizeImage();
    }
    
    
    public static function getInstance()
    {
        if(self::$instance==null)
        {
            self::$instance = new ResizeImage();
        }
        return self::$instance;
    }
    
    
    private function initImage()
    {
        switch($this->type)
        {
            case "jpg":
                $this->im=imagecreatefromjpeg($this->imagepath);
                break;
            case "gif":
                $this->im=imagecreatefromgif($this->imagepath);
                break;
            case "png":
                $this->im=imagecreatefrompng($this->imagepath);
                break;
        }
    }
    
    private function getNewImageName()
    {
        $arr=explode("/",$this->imagepath);
        if(count($arr)==0)
        {
            $arr=explode(".",$this->imagepath);
        }else{
            $arr=explode(".",$arr[count($arr)-1]);
        }
        return $arr[0]."_s.jpg";
    }
    
    private function createResizeImage()
    {
        $resizerito=($this->resize_width/$this->resize_height);
        $rito=($this->width/$this->height);
        
        if($this->cutmode)
        {
            $reim=imagecreatetruecolor($this->resize_width,$this->resize_height);
            imagecopyresampled($reim,$this->im,0,0,$this->cutX,$this->cutY,$this->width,$this->height,$this->width,$this->height);
            imagejpeg($reim,$this->savepath.$this->getNewImageName());
        }else{
            if($this->rito >= $this->resizerito)
            {
                $reim=imagecreatetruecolor($this->resize_width,$this->resize_width/$rito);
                imagecopyresampled($reim,$this->im,0,0,0,0,$this->resize_width,($this->resize_width/$rito),$this->width,$this->height);
                imagejpeg($reim,$this->savepath.$this->getNewImageName());
            }else{
                $reim=imagecreatetruecolor($this->resize_height*$rito,$this->resize_height);
                imagecopyresampled($reim,$this->im,0,0,0,0,($this->resize_height*$rito),$this->resize_height,$this->width,$this->height);
                imagejpeg($reim,$this->savepath.$this->getNewImageName());
            }
        }
    }
    
    private function showErrorMessage($str)
    {
        echo "<script>alert('$str')</script>";
    }
    
    private function getImageX()
    {
        return imagesx($this->im);
    }
    
    private function getImageY()
    {
        return imagesy($this->im);
    }
    
    private function getImageType()
    {
        return strtolower(substr(strrchr($this->imagepath,"."),1));
    }
    
    private function getImageDstPath()
    {
        if(substr($this->uploadpath,-1,1)!="/") 
        {
            $this->savepath=$this->uploadpath."/".date("Ym");
        }else{
            $this->savepath=$this->uploadpath.date("Ym");
        }
        $this->savepath=$this->getFolder($this->savepath);
    }
    
    private function getFolder($folder)
    {
        if(!is_dir($folder))
        {
            mkdir($folder);
        }
        return $folder."/";
    }
    
    public function __destruct()
    {
        $this->im=null;
        $this->width=0;
        $this->height=0;
        $this->imagepath=null;
        $this->savepath=null;
        $this->resize_width=0;
        $this->resize_height0;    
    }
}

?>