php圖片加水印類

自己寫的一個圖片加水印類，暫時只支持水印圖片，水印文字的還沒有完善
代碼不是很完善，歡迎大家交流指正！
調用方式：
先包含類文件
然后實例化類：
$img = new Images;
然后提供圖片：
$img->imgpath(原圖片路徑及名稱，水印圖片路徑及名稱);
之后開始加水印：
$img->send();
說明：
send( strimg filename ) 這個方法有一個函數，可以省略，在省略的情況下，保存的圖片路徑和名稱和原來的一樣，如需保存成例外的圖片，就在這里提供要保存的圖片路徑及名稱
例外，還有一個方法，show(); 這個方法用于顯示加好水印的圖片
這個方法可以單獨調用，但必須先調用 send()方法， 也可以連續調用： $img->send()->show();

 
<?php
class Images{
     private $imgA = '', $imgB = '';
     private $imgWA = 0, $imgWB = 0, $typea = 0;
     private $imgHA = 0, $imgHB = 0, $typeb = 0;
     private $objecta, $objectb;
     private $weizhi = 1; // 1坐上， 2中上， 3 右上， 4 中左， 5中部， 6 中右， 7， 下左， 8 下中， 9 下右
     private $X = 0, $Y = 0;
     private $okfile = '1.jpg';


 public function imgpath( $oldimg = '', $newing = '', $WeiZhi = 1 ) { //指定圖片
    $this->imgA   = $oldimg;
    $this->imgB   = $newing;
    $this->weizhi = $WeiZhi;
   return $this;
 }

 public function send( $Name = '' ){
     !empty( $Name ) or $Name = $this->imgA;
     list($this->imgWA, $this->imgWB, $this->typea) = $this->imgread( $this->imgA );
     list($this->imgHA, $this->imgHB, $this->typeb) = $this->imgread( $this->imgB );
     $this->objecta = $this->openimg( $this->imgA, $this->typea );
     $this->objectb = $this->openimg( $this->imgB, $this->typeb );
     $this->WZ();
     $this->start();
     $this->over( $Name );
     return $this;
 }

private function WZ() {
    switch( $this->weizhi ) {
        case 2:
             $this->X = ( $this->imgWA - $this->imgHA ) / 2;
             break;
        case 3:
             $this->X = ( $this->imgWA - $this->imgHA ); 
             break;
        case 4:
             $this->Y = ( $this->imgWB - $this->imgHB ) / 2 ;
             break;
        case 5:
             $this->X = ( $this->imgWA - $this->imgHA ) / 2;
             $this->Y = ( $this->imgWB - $this->imgHB ) / 2 ;
             break;
        case 6:
             $this->X = ( $this->imgWA - $this->imgHA );
             $this->Y = ( $this->imgWB - $this->imgHB ) / 2 ;
             break;
        case 7:
             $this->Y = ( $this->imgWB - $this->imgHB );
             break;
        case 8:
             $this->X = ( $this->imgWA - $this->imgHA ) / 2;
             $this->Y = ( $this->imgWB - $this->imgHB );
             break;
        case 9:
             $this->X = ( $this->imgWA - $this->imgHA );
             $this->Y = ( $this->imgWB - $this->imgHB );
             break;
        default:
            $this->X = 0;
            $this->Y = 0;
    }
}

private function openimg( $FileName = '', $type = 0 ) {
    switch( $type ) {
        case 1:
             $obj = imagecreatefromgif( $FileName ); break;
        case 2:
             $obj = imagecreatefromjpeg( $FileName ); break;
        case 3:
             $obj = imagecreatefrompng( $FileName ); break;
        default:
            return false;
    }
   return $obj;
}

private function start(){
    imagecopy( $this->objecta, $this->objectb, $this->X, $this->Y, 0, 0, $this->imgHA, $this->imgHB );
}

private function over( $name = '1.jpg' ) {
    $this->okfile = $name;
    switch ( $this->typea ) {
        case 1:
            imagegif( $this->objecta, $name );break;
        case 2:
            imagejpeg( $this->objecta, $name );break;
        case 3:
            imagepng( $this->objecta, $name ); break;
        default:
           return false;
    }
}



private function imgread( $FilePath = '' ) {
    $Arr = getimagesize( $FilePath );
    return array( $Arr[0], $Arr[1], $Arr[2] );
}



public function show(){
       @header('content-type:image/*');
       echo @file_get_contents( $this->okfile );
   }
}
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