實現縮略圖和加水印的php類

/**


圖片縮放水印類
*

@version 1.0 ;
/
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>