給圖片添加水印的PHP類

jopen 9年前發布 | 955 次閱讀 PHP

支持文字水印、圖片水印支持水印的位置隨機或固定（九宮格）水印透明度設置（圖片水印和文字水印都支持）文字水印的字體、顏色、大小設置圖片水印的背景透明

<?php
/**

加水印類，支持文字圖片水印的透明度設置、水印圖片背景透明。
日期：2011-09-27
作者：www.itwhy.org
使用：
$obj = new WaterMask($imgFileName);         //實例化對象
$obj->$waterType = 1;                       //類型：0為文字水印、1為圖片水印
$obj->$transparent = 45;                    //水印透明度
$obj->$waterStr = 'www.itwhy.org';          //水印文字
$obj->$fontSize = 16;                       //文字字體大小
$obj->$fontColor = array(255,0255);         //水印文字顏色（RGB）
$obj->$fontFile = = 'AHGBold.ttf';          //字體文件
$obj->output();                             //輸出水印圖片文件覆蓋到輸入的圖片文件
*/
class WaterMask{
public  $waterType          = 1;                //水印類型：0為文字水印、1為圖片水印
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;               //文字字體大小
public  $fontColor          = array(255,0,255); //水印文字顏色（RGB）
public  $fontFile           = 'AHGBold.ttf';    //字體文件
public  $waterImg           = 'logo.png';       //水印圖片
private $srcImg             = '';               //需要添加水印的圖片
private $im                 = '';               //圖片句柄
private $water_im           = '';               //水印圖片句柄
private $srcImg_info        = '';               //圖片信息
private $waterImg_info      = '';               //水印圖片信息
private $str_w              = '';               //水印文字寬度
private $str_h              = '';               //水印文字高度
private $x                  = '';               //水印X坐標
private $y                  = '';               //水印y坐標
function __construct($img) {        //析構函數
$this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
}
private function imginfo() {                //獲取需要添加水印的圖片的信息，并載入圖片。
$this->srcImg_info = getimagesize($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('原圖片（'.$this->srcImg.'）格式不對，只支持PNG、JPEG、GIF。');

}
}
private function waterimginfo() {           //獲取水印圖片的信息，并載入圖片。
$this->waterImg_info = getimagesize($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('水印圖片（'.$this->srcImg.'）格式不對，只支持PNG、JPEG、GIF。');

}
}
private function waterpos() {               //水印位置算法
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]);
    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 = $this->transparent;
imagecopy($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('添加水印失敗！');
    break;

}
imagedestroy($this->im);
imagedestroy($this->water_im);
}
}
?></pre>

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