php圖片浮水印類別支援浮水印透明與背景透明

/**
* 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：bbs.it-home.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 = 'bbs.it-home.org'; //水印文字
* $obj->$fontSize = 16; //文字字體大小
* $obj->$fontColor = array(255, 0255); //浮水印文字顏色（RGB）
* $obj->$fontFile = = 'AHGBold.ttf'; //字型檔
* $obj->output(); //輸出浮水印圖片文件覆蓋到輸入的圖片檔
*/
class WaterMask{
public $waterType = 1; //浮水印類型：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; //浮水印透明度
public $waterStr = 'bbs. it-home.org'; //浮水印文字
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'; //字型檔
public $waterImg = 'logo.png'; //水印圖片
private $srcImg = ''; //需要加浮水印的圖片
private $im = ''; //圖片句柄
private $water_im = ''; //浮水印圖片句柄
private $srcImg_info = ''; //圖片資訊
private $waterImg_info = '' ; //浮水印圖片資訊
private $str_w = ''; //浮水印文字寬度
private $str_h = ''; //水印文字高度
private $x = ''; //浮水印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.'" 原始檔案不存在！');
}
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]);
休息1;
情況1: //上左
$this->x = 0;
$this->y = 0;
休息1;
情況2: //上中
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$ this->y = 0;
休息1;
情況3: //上右
$this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
$this->y = 0;
休息1;
情況4: //中左
$this->x = 0;
$this->y = ($this ->srcImg_info[1]-$this->waterImg_info[1])/2;
休息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;
休息1;
情況6: //中右
$this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
$this->y = ( $this->srcImg_info[1]-$this->waterImg_info[1])/2;
休息1;
情況7: //下左
$this->x = 0;
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
休息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];
休息1;
default: //下右
$this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
休息1;
}
}
私有函數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);
}
私人函數waterstr() {
$rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
$w = abs($ rect[2]-$rect[6]);
$h = abs($rect[3]-$rect[7]);
$fontHeight = $this->fontSize;
$this ->water_im = imagecreatetruecolor($w, $h);
imagealphablending($this->water_im,false);
imagesavealpha($this->water_im,true);
$white_alpha = imagecolor this->water_im,255,255,255,127);
imagefill($this->water_im,0,0,$white_alpha);
$color = imageColallocate($this->water_im,$this->fontor[0],$this] $this->fontColor[1],$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);
休息1;
情況2：
imagejpeg($this->im,$this->srcImg);
休息1;
情況1：
imagegif($this->im,$this->srcImg);
休息1;
default:
die('添加浮水印失敗！ ');
休息;
}
imagedestroy($this->im);
imagedestroy($this->water_im);
}
}
?>