PHP加水印代码 支持文字和图片水印

001

002class WaterMask{

003 public $waterType = 1; //水印类型：0为文字水英1为图片水印

004 public $pos = 0; //水印位置

005 public $transparent = 45; //水印透明度

006 public $waterStr = 'www.codefans.net'; //水印文字

007 public $fontSize = 16; //文字字体大小

008 public $fontColor = array(255,0,255); //水印文字颜色(RGB)

009 public $fontFile = 'AHGBold.ttf';//字体文件

010 public $waterImg = 'logo.png';//水印图片

011 private $srcImg = '';//需要添加水印的图片

012 private $im = '';//图片句柄

013 private $water_im = '';//水印图片句柄

014 private $srcImg_info = '';//图片信息

015 private $waterImg_info = '';//水印图片信息

016 private $str_w = '';//水印文字宽度

017 private $str_h = '';//水印文字高度

018 private $x = '';//水印X坐标

019 private $y = '';//水印y坐标

020 function __construct($img) {

021 $this->srcImg = file_exists($img) $img : die('"'.$img.'" 对不起，水印文件不存在!');

022 }

023 private function imginfo() {//获取水印图片信息，并加载。

024 $this->srcImg_info = getimagesize($this->srcImg);

025 switch ($this->srcImg_info[2]) {

026 case 3:

027 $this->im = imagecreatefrompng($this->srcImg);

028 break 1;

029 case 2:

030 $this->im = imagecreatefromjpeg($this->srcImg);

031 break 1;

032 case 1:

033 $this->im = imagecreatefromgif($this->srcImg);

034 break 1;

035 default:

036 die('水印图片('.$this->srcImg.')水印图片格式不对，请选择PNG、JPEG、GIF格式的图片。');

037 }

038 }

039 private function waterimginfo() {//获取水印图片并载入。

040 $this->waterImg_info = getimagesize($this->waterImg);

041 switch ($this->waterImg_info[2]) {

042 case 3:

043 $this->water_im = imagecreatefrompng($this->waterImg);

044 break 1;

045 case 2:

046 $this->water_im = imagecreatefromjpeg($this->waterImg);

047 break 1;

048 case 1:

049 $this->water_im = imagecreatefromgif($this->waterImg);

050 break 1;

051 default:

052 die('水印图片('.$this->srcImg.')格式不对，只支持PNG、JPEG、GIF。');

053 }

054 }

055 private function waterpos() {//水印位置算法

056 switch ($this->pos) {

057 case 0: //随机位置

058 $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);

059 $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);

060 break 1;

061 case 1: //上左

062 $this->x = 0;

063 $this->y = 0;

064 break 1;

065 case 2: //上中

066 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;

067 $this->y = 0;

068 break 1;

069 case 3: //上右

070 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];

071 $this->y = 0;

072 break 1;

073 case 4: //中左

074 $this->x = 0;

075 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;

076 break 1;

077 case 5: //中中

078 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;

079 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;

080 break 1;

081 case 6: //中右

082 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];

083 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;

084 break 1;

085 case 7: //下左

086 $this->x = 0;

087 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];

088 break 1;

089 case 8: //下中

090 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;

091 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];

092 break 1;

093 default: //下右

094 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];

095 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];

096 break 1;

097 }

098 }

099 private function waterimg() {

100 if ($this->srcImg_info[0] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){

101 die('水印比原图大!');

102 }

103 $this->waterpos();

104 $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);

105 imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);

106 $pct = $this->transparent;

107 imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);

108 imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);

109 }

110 private function waterstr() {

111 $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);

112 $w = abs($rect[2]-$rect[6]);

113 $h = abs($rect[3]-$rect[7]);

114 $fontHeight = $this->fontSize;

115 $this->water_im = imagecreatetruecolor($w, $h);

116 imagealphablending($this->water_im,false);

117 imagesavealpha($this->water_im,true);

118 $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);

119 imagefill($this->water_im,0,0,$white_alpha);

120 $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);

121 imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);

122 $this->waterImg_info = array(0=>$w,1=>$h);

123 $this->waterimg();

124 }

125 function output() {

126 $this->imginfo();

127 if ($this->waterType == 0) {

128 $this->waterstr();

129 }else {

130 $this->waterimginfo();

131 $this->waterimg();

132 }

133 switch ($this->srcImg_info[2]) {

134 case 3:

135 imagepng($this->im,$this->srcImg);

136 break 1;

137 case 2:

138 imagejpeg($this->im,$this->srcImg);

139 break 1;

140 case 1:

141 imagegif($this->im,$this->srcImg);

142 break 1;

143 default:

144 die('原因未知：水印添加失败!');

145 break;

146 }

147 imagedestroy($this->im);

148 imagedestroy($this->water_im);

149 }

150}

151?>

PHP生成水印类用法：

view sourceprint?01

02$obj = new WaterMask($imgFileName);

03$obj->$waterType = 1;//水印类型：0为文字水英1为图片水印

04$obj->$transparent = 45;//水印透明度

05$obj->$waterStr = 'www.codefans.net';//水印文字

06$obj->$fontSize = 16;//字体大小

07$obj->$fontColor = array(255,0,255);//水印文字颜色(RGB值)

08$obj->$fontFile = = 'AHGBold.ttf'; //字体名称

09$obj->output(); //输出水印图片

10?>