PHP圖片縮放水印類

/**


圖片縮放水印類
/
class cls_photo
{
  protected $waterrate = 0.2; //水印圖標在圖片上的比例
  protected $width = 300; //縮略圖默認寬度
  protected $height = 200; //縮略圖默認高度
  protected $padding = 5;  //水印圖到邊的距離
  protected $water_mark = "./water.png";
  protected $water_mark_pos = 5;//水印圖片位置（1=左上角，2=右上角，3=左下角,4=右下角,5中央）
  protected $watermode = 0;// 0縮略圖時不打水印 1縮略圖時打水印
  protected $magick_handle;//圖片操作句柄
  protected $format = array ( 'jpg','gif','png','jpeg' ); // 圖片文件格式限定
  protected $smallpic_mode = 2;//默認模式 0為不生成縮略圖， 1為裁切縮放 ，2為比例縮放 3為縮放填充模式
/**

設置圖片類參數
*
@param $arg 圖片參數 多次可放入數組里 如下
@param $protected 參數值
array(
'waterrate'=>0.2,
'water_mark'=>'./water.png',
'water_mark_pos'=>4,
'smallpic_mode'=>1
);
@return ture/false
*/
public function set_args ( $arg,$val="" )
{
 $params = array ( 'waterrate','water_mark','water_mark_pos','smallpic_mode','watermode','width','height' );
 if ( is_array ( $arg ) )
 {

 foreach ( $arg as $k =>$v )
 {
     if ( in_array ( $k,$params ) )
     {
         $this->$k = $v;
     }
 }

}
 else
 {

 if ( empty ( $val ) )
 {
     return false;
 }
 else
 {
     if ( in_array ( $arg,$params ) )
     {
         $this->$arg = $val;
     }
 }

}
 return true;
}
/**

圖片縮放
*
@param $src_file 源文件路徑
@param $dst_file 目標文件路徑
@return 縮略圖片路徑/false
*/
public function scale ( $src_file,$dst_file="" )
{
 $dst_width  = $this->width;
 $dst_height = $this->height;
 $mode       = $this->smallpic_mode;
 $magic_water_handle = NewMagickWand();
 if ( !MagickReadImage ( $magic_water_handle, $src_file ) ) return false;
//類型
 $srcext = strtolower ( MagickGetImageFormat ( $magic_water_handle ) );
 if ( $srcext=='bmp' )
 {

 $srcext = 'jpeg';

}
 if ( !in_array ( $srcext,$this->format ) ) return false;
 //尺寸
 $src_width = MagickGetImageWidth ( $magic_water_handle );
 $src_height = MagickGetImageHeight ( $magic_water_handle );
//裁切縮放模式
 if ( $mode == 1 )
 {

 $pos_x=$pos_y = 0;//裁切臨時位置
 $src_widthc = $src_width;//裁切臨時寬度
 $src_heightc = $src_height;//裁切臨時高度
 if ( $src_width/$src_height>$dst_width/$dst_height )
 {
     $src_widthc = $src_height*$dst_width/$dst_height;
     $pos_x = ( $src_width-$src_widthc ) /2;

 }
 else
 {
     $src_heightc = $src_width*$dst_height/$dst_width;
     $pos_y = ( $src_height-$src_heightc ) /2;
 }
 MagickCropImage ( $magic_water_handle,$src_widthc,$src_heightc,$pos_x,$pos_y );//裁切
 //因為MagickCropImage函數后，Gif 圖像改，但畫布不變
 $this->magick_handle = NewMagickWand();
 MagickNewImage ( $this->magick_handle,$src_widthc,$src_heightc,'#ffffff' );
 MagickSetFormat ( $this->magick_handle,$srcext );
 MagickCompositeImage ( $this->magick_handle,$magic_water_handle,MW_OverCompositeOp,0,0 );
 //縮放
 MagickScaleImage ( $this->magick_handle, $dst_width, $dst_height );


}
 //比例縮放模式
 if ( $mode == 2 )
 {

 if ( $src_width/$src_height>$dst_width/$dst_height )
 {
     $dst_height=$dst_width*$src_height/$src_width;
 }
 else
 {
     $dst_width=$dst_height*$src_width/$src_height;
 }
 $this->magick_handle=$magic_water_handle;//替換
 MagickScaleImage ( $this->magick_handle, $dst_width, $dst_height );//縮放

}
 //縮放填充模式
 if ( $mode == 3 )
 {

 if ( $src_width/$src_height>$dst_width/$dst_height )
 {
     $dst_heightc=$dst_width*$src_height/$src_width;
     $dst_widthc=$dst_width;
 }
 else
 {
     $dst_widthc=$dst_height*$src_width/$src_height;
     $dst_heightc=$dst_height;
 }
 MagickScaleImage ( $magic_water_handle, $dst_widthc, $dst_heightc );//縮放
 $this->magick_handle = NewMagickWand();
 MagickNewImage ( $this->magick_handle,$dst_width,$dst_height,$this->smallpic_bgcolor );
 MagickSetFormat ( $this->magick_handle,$srcext );
 MagickCompositeImage ( $this->magick_handle,$magic_water_handle,MW_OverCompositeOp, ( $dst_width-$dst_widthc ) /2, ( $dst_height-$dst_heightc ) /2 );

}
 //打水印
 if ( $this->watermode == 1 )
 {

 $this->set_mark();

}
 if ( empty ( $dst_file ) )
 {

 //建立臨時文件
 $dst_file = tempnam ( $_SERVER["SINASRV_CACHE_DIR"],"TMP_IMG" );

}
 MagickWriteImage ( $this->magick_handle, $dst_file );
 return $dst_file;
}
/**

打水印
*
@param $src_file 要打水印的圖片路徑
@param $dst_file 生產水印的文件保存路徑，為空則生產隨機臨時文件
@return 水印文件路徑/false
*/
public function water_mark ( $src_file,$dst_file="" )
{
 $this->magick_handle = NewMagickWand();
 if ( !MagickReadImage ( $this->magick_handle, $src_file ) )

 return false;

$this->set_mark();
 if ( empty ( $dst_file ) )
 {

 //建立臨時文件
 $dst_file = tempnam ( $_SERVER["SINASRV_CACHE_DIR"],"TMP_IMG" );

}
 MagickWriteImage ( $this->magick_handle, $dst_file );
 return $dst_file;
}
/**

對內接口
給圖片打水印
/
protected  function set_mark()
{
//尺寸
 $dst_width = MagickGetImageWidth ( $this->magick_handle );
 $dst_height = MagickGetImageHeight ( $this->magick_handle );
 //處理水印圖
 if ( $this->water_mark && is_file ( $this->water_mark ) )
 {

 $magic_water_handle = NewMagickWand();
 MagickRemoveImage ( $magic_water_handle );
 if ( MagickReadImage ( $magic_water_handle, $this->water_mark ) )
 {
     MagickScaleImage ( $magic_water_handle, $dst_width*$this->waterrate, $dst_width*$this->waterrate*MagickGetImageHeight ( $magic_water_handle ) /MagickGetImageWidth ( $magic_water_handle ) );//縮放水印到圖片的1/5
     if ( $this->water_mark_pos == 1 )
     {
         $left = $this->padding;
         $top = $this->padding;
     }
     elseif ( $this->water_mark_pos == 2 )
     {
         $left = $dst_width-$this->padding-MagickGetImageWidth ( $magic_water_handle );
         $top = $this->padding;
     }
     elseif ( $this->water_mark_pos == 3 )
     {
         $left = $this->padding;
         $top = $dst_height -$this->padding-MagickGetImageHeight ( $magic_water_handle );
     }
     elseif ( $this->water_mark_pos == 4 )
     {
         $left = $dst_width-$this->padding-MagickGetImageWidth ( $magic_water_handle );
         $top =$dst_height -$this->padding-MagickGetImageHeight ( $magic_water_handle );
     }
     elseif ( $this->water_mark_pos == 5 )
     {
         $left = ( $dst_width-MagickGetImageWidth ( $magic_water_handle ) ) /2;
         $top = ( $dst_height -MagickGetImageHeight ( $magic_water_handle ) ) /2;
     }
     MagickCompositeImage ( $this->magick_handle,$magic_water_handle,MW_OverCompositeOp,$left,$top );
 }

}
}
}</pre>