PHP image watermark code_PHP tutorial

/**
* Add watermark class, support transparency setting of text and picture watermarks, and transparent background of watermark pictures.
* Date: 2011-09-27
* Author: www.jb51.net
* Usage:
* $obj = new WaterMask($imgFileName); //Instantiate object
* $obj->$waterType = 1; //Type: 0 is text watermark, 1 is picture watermark
* $obj->$transparent = 45; //Watermark transparency
* $obj-> ;$waterStr = 'www.jb51.net'; //Watermark text
* $obj->$fontSize = 16; //Text font size
* $obj->$fontColor = array(255 ,0255); //Watermark text color (RGB)
* $obj->$fontFile = = 'AHGBold.ttf'; //Font file
* $obj->output(); // The output watermark image file is overwritten into the input image file
*/
class WaterMask{
public $waterType = 1; //Watermark type: 0 is text watermark, 1 is image watermark
public $pos = 0; //Watermark position
public $transparent = 45; //Watermark transparency

public $waterStr = 'www.jb51.net'; //Watermark text
public $fontSize = 16; //Text font size
public $fontColor = array(255,0,255); //Watermark text color (RGB)
public $fontFile = 'AHGBold.ttf'; //Font File

public $waterImg = 'logo.png'; //Watermark image

private $srcImg = ''; //Picture that needs to be watermarked
private $im = '' ; //Picture handle
private $water_im = ''; //Watermark picture handle
private $srcImg_info = ''; //Picture information
private $waterImg_info = ''; //Watermark picture information
private $str_w = ''; //Watermark text width
private $str_h = ''; //Watermark text height
private $x = ''; //Watermark X coordinate
private $y = ''; //Watermark y coordinate

function __construct($img) { //Destructor
$this->srcImg = file_exists($img) ? $img : die('" '.$img.'" The source file does not exist!');
}
private function imginfo() { //Get the information of the image that needs to be watermarked and load the image.
$this->srcImg_info = getimagesize($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('original picture('.$this ->srcImg.') format is incorrect, only supports PNG, JPEG, GIF ');
}
}
private function waterimginfo() { //Get the watermark image information and load the image. .
$this->waterImg_info = getimagesize($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('watermark image('.$this ->srcImg.') The format is incorrect and only supports PNG, JPEG, and GIF.');
}
}
private function waterpos() { //水印位置算法
switch ($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);
}
}
?>