首页 > WEB开发 > 代码 > PHP图片加水印类,支持文字水印、透明度设置、自定义水印类
2015
01-30

PHP图片加水印类,支持文字水印、透明度设置、自定义水印类

<?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

 *		……

 *      $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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