將圖片添加浮水印的PHP類

支援文字浮水印、圖片浮水印支援浮水印的位置隨機或固定（九宮格）浮水印透明度設定（圖片浮水印和文字浮水印都支援）文字浮水印的字體、顏色、大小設定圖片浮水印的背景透明

/**
 * 加浮水印類，支援文字圖片浮水印的透明度設定、浮水印圖片背景透明。
 * 日期：2011-09-27
 * 作者：www.itwhy.org
 * 使用：
 * $obj = new WaterMask($imgFileName); //實例化物件
 * $obj->$waterType = 1; //類型：0為文字浮水印、1為圖片浮水印
 * $obj->$transparent = 45; //水印透明度
 * $obj->$waterStr = 'www.itwhy.org'; //水印文字
 * $obj->$fontSize = 16; //文字字體大小
 * $obj->$fontColor = array(255,0255); / /水印文字顏色（RGB）
 * $obj->$fontFile = = 'AHGBold.ttf'; //字體檔案
 * $obj->output(); //輸出水印圖片檔案覆蓋輸入的圖片檔
*/
class WaterMask{
 public $waterType = 1; //水印類型：0為文字浮水印、1為圖片浮水印
 public $pos = 0; //浮水印位置
 public $transparent = 45; //水印透明度

 public $waterStr = 'www.itwhy.org'; //水印文字
 public $ fontSize = 16; //文字字體大小
 public $fontColor = array(255,0,255); //水印文字顏色（RGB）
 public $fontFile = 'AHGBold.ttf'; //字體檔案

 public $waterImg = 'logo.png'; //浮水印圖片

 private $srcImg = ''; //需要加浮水印的圖片
 private $im = ''; //圖片句柄
 private $water_im = ''; //水印圖片句柄
 private $srcImg_info = ''; //圖片資訊
 private $waterImg_info = ''; //水印圖片資訊
 private $waterImg_info = ''; //水印圖片資訊
 private $str_w = ''; //浮水印文字寬度
 private $str_h = ''; //浮水印文字高度
 private $x = ''; //水印X座標
 private $y = '' ; //浮水印y座標

 function __construct($img) { //析構函數
 $this->srcImg = file_exists($img) ? $img : die('"'.$img .'" 原始檔不存在！ ');
 }
 private function imginfo() { //取得需要加入浮水印的圖片的信息，並載入圖片。
 $this->srcImg_info = getimagesize($this->srcImg);
 switch ($this->srcImg_info[2]) {
 case 3:
 $this->im = imagecreate $this->srcImg);
 break 1;
 case 2:
 $this->im = imagecreatefromjpeg($this->srcImg);
 break 1;
 case 1:
 $this->im = imagecreatefromgif($this->srcImg);
 break 1;
 default:
 die('原文圖片（'.$this->srcImg.'）格式不對，只支援PNG、JPEG、GIF。
 $this->waterImg_info = getimagesize($this->waterImg);
 switch ($this->waterImg_info[2]) {
 case 3:
 $this->water_im = imagecreatefrompng( $this->waterImg);
 break 1;
 case 2:
 $this->water_im = imagecreatefromjpeg($this->waterImg);
 break 1;
 case 1:
 $this->water_im = imagecreatefromgif($this->waterImg);
 break 1;
 default:
 die('水印圖片（'.$this->srcImg.'）格式不對，只支援PNG、JPEG、GIF。');
 }
 }
 private function waterpos() { //水印位置演算法
 switch ($this->pos) {
 case 0: // 隨機位置
 $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
 $this->y = rand(0,$this->srcImg_info[1] -$this->waterImg_info[1]);
 break 1;
 case 1: //上左
 $this->x = 0;
 $this->y = 0;
break 1;
情況2: //上中
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$ this->y = 0;
 break 1;
 case 3: //上右
 $this->x = $this-> ;srcImg_info[0]-$this->waterImg_info[0] ;
 $this->y = 0;
 break 1;
 case 4: //中左
 $this->x = 0;
 $this->y = ($ this->srcImg_info[1]-$this->waterImg_info[1])/2;
 規則1;
 case 5: //中中
 $this->x = ($this-> srcImg_info[0]-$this->waterImg_info[0])/2;
 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
 Break 1;
 案例6: //中右
 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1] )/2;
 break 1;
 case 7: //下左
 $this->x = 0;
 $this->y = $this->srcImg_info[1 ]-$this->waterImg_info[1];
 break 1;
 case 8: //下方
 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
 中斷1;
 預設值: //下右
 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
 $this-> y = $this->srcImg_info[1]-$this->waterImg_info[1];
break 1;
 }
 }
 private function waterimg() {
 if ($this ->; srcImg_info[0] waterImg_info[0] || $this->srcImg_info[1] waterImg_info[1]){
 die('水印比原圖大！');
 }
 $this->waterpos();
 $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
 imagecopy( $cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1] );
 $pct = $this->透明;
 imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this ->waterImg_info[1]);
 imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0 ],$this->waterImg_info[1],$pct);
 }
 private function waterstr() {
 $rect = imagettfbbox($this->fontSize,0,$this-> ;fontFile,$this->waterStr);
 $w = abs( $矩形[2]-$矩形[6]);
 $h = abs($矩形[3]-$矩形[7]);
 $fontHeight = $this->fontSize;
 $ this->water_im = imagecreatetruecolor($w, $h);
 imagealphablending($this->water_im,false);
 imagesavealpha($this->water_im,true);
 $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
 imagefill($this-00,00,000,000
 $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
 imagettftext($this- >water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
 $this->waterImg_info = array(0=>$ w,1=>$h);
 $this->waterimg();
 }
 函數輸出() {
 $this->imginfo();
 if ($this ->waterType == 0) {
 $this->waterstr();
 }else {
 $this->waterimginfo();
 $this->waterimg();
 }
 switch ($this->srcImg_info[2]) {
 情況3:
 imagepng($ this->im,$this->srcImg);
 中斷1;
情況>情況2:
 imagejpeg($this->im,$this->srcImg);
 規則1;
 情況1:
 imagegif($this->im,$this->srcImg);
 break 1;
 預設：
 die('新增浮水印失敗！' );
 規則;
 }
 imagedestroy($this->im);
 imagedestroy(imagedestroy($this->im);
 imagedestroy(imagedestroy( $this->water_im);
 }
}

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