图片加水印类，支持文字水印、透明度设置、自定义水印代码,PHP代码库,德仔网

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【PHP】图片加水印类，支持文字水印、透明度设置、自定义水印
作者:Hardy / 发布于2015/10/13/ 333

	<?php
	
	/*
	
	*Version: 1.0
	
	*Author: River
	
	*URL: http://www.phpxs.com/
	
	*/
	
	
	
	/**
	
	* 图片加水印类，支持文字水印、透明度设置、自定义水印位置等。
	
	* 使用示例：
	
	* $obj = new WaterMask($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.codetc.com'; //水印文字
	
	* $obj->$fontSize = 18; //文字字体大小
	
	* $obj->$fontColor = array(255,255,255); //水印文字颜色（RGB）
	
	* $obj->$fontFile = 'AHGBold.ttf'; //字体文件
	
	* &hellip;&hellip;
	
	* $obj->output(); //输出水印图片文件覆盖到输入的图片文件
	
	*/
	
	class WaterMask{
	
	 public $waterType = 0; //水印类型：0为文字水印、1为图片水印
	
	 public $pos = 0; //水印位置
	
	 public $transparent = 45; //水印透明度
	
	
	
	 public $waterStr = 'www.codetc.com'; //水印文字
	
	 public $fontSize = 18; //文字字体大小
	
	 public $fontColor = array(255,255,255); //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[2]) {
	
	 case 3:
	
	 $this->im = imagecreatefrompng($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[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 0: //随机位置
	
	 $this->x = rand(0,$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;
	
	 case 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;
	
	 break 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;
	
	 case 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: //下中
	
	 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
	
	 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
	
	 break 1;
	
	 default: //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] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){
	
	 die('注意:水印比原图大！');
	
	 }
	
	 $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->transparent;
	
	 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);
	
	 $w = abs($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);
	
	 $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
	
	 imagefill($this->water_im,0,0,$white_alpha);
	
	 $color = imagecolorallocate($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();
	
	 }
	
	
	
	 function output() {
	
	 $this->imginfo();
	
	 if ($this->waterType == 0) {
	
	 $this->waterstr();
	
	 }else {
	
	 $this->waterimginfo();
	
	 $this->waterimg();
	
	 }
	
	 switch ($this->srcImg_info[2]) {
	
	 case 3:
	
	 imagepng($this->im,$this->srcImg);
	
	 break 1;
	
	 case 2:
	
	 imagejpeg($this->im,$this->srcImg);
	
	 break 1;
	
	 case 1:
	
	 imagegif($this->im,$this->srcImg);
	
	 break 1;
	
	 default:
	
	 die('添加水印失败哦！');
	
	 break;
	
	 }
	
	 imagedestroy($this->im);
	
	 imagedestroy($this->water_im);
	
	 }
	
	}
	
	?>
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