文字与图片水印透明度与位置自定义技术-优快云博客

<?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。
 * 日期：2011-09-27
 * 作者：www.itwhy.org
 * 使用：
 *      $obj = new WaterMask($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          = 1;               
//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.itwhy.org';  
//水印文字
    public 
$fontSize           = 16;              
//文字字体大小
    public 
$fontColor          = 
array(255,0,255); 
//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('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！');
                break;
        }
        imagedestroy($this->im);
        imagedestroy($this->water_im);
    }
}
?>
php为图片填加水印
