PHP 图片水印类

<?php
/**
* 加水印类，支持文字图片水印的透明度设置、水印图片背景透明。
* $obj = new WaterMask($imgFileName); //实例化对象
* $obj->$waterType = 1; //类型：0为文字水印、1为图片水印
* $obj->$transparent = 45; //水印透明度
* $obj->$waterStr = 'www.itwhy.org'; //水印文字
* $obj->$fontSize = 16; //文字字体大小
* $obj->$fontColor = array(255,0255); //水印文字颜色（RGB）
* $obj->$fontFile = = 'AHGBold.ttf'; //字体文件
* $obj->output(); //输出水印图片文件覆盖到输入的图片文件
*/
class WaterMask{
public $waterType = ; //水印类型：0为文字水印、1为图片水印
public $pos = ; //水印位置
public $transparent = ; //水印透明度 public $waterStr = 'www.itwhy.org'; //水印文字
public $fontSize = ; //文字字体大小
public $fontColor = array(,,); //水印文字颜色（RGB）
public $fontFile = 'AHGBold.ttf'; //字体文件 public $waterImg = 'logo.png'; //水印图片 private $srcImg = ''; //需要添加水印的图片
private $im = ''; //图片句柄
private $water_im = ''; //水印图片句柄
private $srcImg_info = ''; //图片信息
private $waterImg_info = ''; //水印图片信息
private $str_w = ''; //水印文字宽度
private $str_h = ''; //水印文字高度
private $x = ''; //水印X坐标
private $y = ''; //水印y坐标 function __construct($img) { //析构函数
$this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
}
private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。
$this->srcImg_info = getimagesize($this->srcImg);
switch ($this->srcImg_info[]) {
case :
$this->im = imagecreatefrompng($this->srcImg);
break ;
case :
$this->im = imagecreatefromjpeg($this->srcImg);
break ;
case :
$this->im = imagecreatefromgif($this->srcImg);
break ;
default:
die('原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
}
}
private function waterimginfo() { //获取水印图片的信息，并载入图片。
$this->waterImg_info = getimagesize($this->waterImg);
switch ($this->waterImg_info[]) {
case :
$this->water_im = imagecreatefrompng($this->waterImg);
break ;
case :
$this->water_im = imagecreatefromjpeg($this->waterImg);
break ;
case :
$this->water_im = imagecreatefromgif($this->waterImg);
break ;
default:
die('水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
}
}
private function waterpos() { //水印位置算法
switch ($this->pos) {
case : //随机位置
$this->x = rand(,$this->srcImg_info[]-$this->waterImg_info[]);
$this->y = rand(,$this->srcImg_info[]-$this->waterImg_info[]);
break ;
case : //上左
$this->x = ;
$this->y = ;
break ;
case : //上中
$this->x = ($this->srcImg_info[]-$this->waterImg_info[])/;
$this->y = ;
break ;
case : //上右
$this->x = $this->srcImg_info[]-$this->waterImg_info[];
$this->y = ;
break ;
case : //中左
$this->x = ;
$this->y = ($this->srcImg_info[]-$this->waterImg_info[])/;
break ;
case : //中中
$this->x = ($this->srcImg_info[]-$this->waterImg_info[])/;
$this->y = ($this->srcImg_info[]-$this->waterImg_info[])/;
break ;
case : //中右
$this->x = $this->srcImg_info[]-$this->waterImg_info[];
$this->y = ($this->srcImg_info[]-$this->waterImg_info[])/;
break ;
case : //下左
$this->x = ;
$this->y = $this->srcImg_info[]-$this->waterImg_info[];
break ;
case : //下中
$this->x = ($this->srcImg_info[]-$this->waterImg_info[])/;
$this->y = $this->srcImg_info[]-$this->waterImg_info[];
break ;
default: //下右
$this->x = $this->srcImg_info[]-$this->waterImg_info[];
$this->y = $this->srcImg_info[]-$this->waterImg_info[];
break ;
}
}
private function waterimg() {
if ($this->srcImg_info[] <= $this->waterImg_info[] || $this->srcImg_info[] <= $this->waterImg_info[]){
die('水印比原图大！');
}
$this->waterpos();
$cut = imagecreatetruecolor($this->waterImg_info[],$this->waterImg_info[]);
imagecopy($cut,$this->im,,,$this->x,$this->y,$this->waterImg_info[],$this->waterImg_info[]);
$pct = $this->transparent;
imagecopy($cut,$this->water_im,,,,,$this->waterImg_info[],$this->waterImg_info[]);
imagecopymerge($this->im,$cut,$this->x,$this->y,,,$this->waterImg_info[],$this->waterImg_info[],$pct);
}
private function waterstr() {
$rect = imagettfbbox($this->fontSize,,$this->fontFile,$this->waterStr);
$w = abs($rect[]-$rect[]);
$h = abs($rect[]-$rect[]);
$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,,,,);
imagefill($this->water_im,,,$white_alpha);
$color = imagecolorallocate($this->water_im,$this->fontColor[],$this->fontColor[],$this->fontColor[]);
imagettftext($this->water_im,$this->fontSize,,,$this->fontSize,$color,$this->fontFile,$this->waterStr);
$this->waterImg_info = array(=>$w,=>$h);
$this->waterimg();
}
function output() {
$this->imginfo();
if ($this->waterType == ) {
$this->waterstr();
}else {
$this->waterimginfo();
$this->waterimg();
}
switch ($this->srcImg_info[]) {
case :
imagepng($this->im,$this->srcImg);
break ;
case :
imagejpeg($this->im,$this->srcImg);
break ;
case :
imagegif($this->im,$this->srcImg);
break ;
default:
die('添加水印失败！');
break;
}
imagedestroy($this->im);
imagedestroy($this->water_im);
}
}
?>