{

var $im = null;

var $im_fullbg = null;

var $im_bg = null;

var $im_slide = null;

var $bg_width = 240;

var $bg_height = 150;

var $mark_width = 50;

var $mark_height = 50;

var $bg_num = 6;

var $_x = 0;

var $_y = 0;

//容错象素 越大体验越好，越小破解难道越高

var $_fault = 3;

function __construct(){

//ini_set('display_errors','On');

//

error_reporting(0);

if(!isset($_SESSION)){

session_start();

}

}

function make(){

$this->_init();

$this->_createSlide();

$this->_createBg();

$this->_merge();

$this->_imgout();

$this->_destroy();

}

function check($offset=''){

if(!$_SESSION['tncode_r']){

return false;

}

if(!$offset){

$offset = $_REQUEST['tn_r'];

}

$ret = abs($_SESSION['tncode_r']-$offset)<=$this->_fault;

if($ret){

unset($_SESSION['tncode_r']);

}else{

$_SESSION['tncode_err'] ;

if($_SESSION['tncode_err']>10){//错误10次必须刷新

unset($_SESSION['tncode_r']);

}

}

return $ret;

}

private function _init(){

$bg = mt_rand(1,$this->bg_num);

$file_bg = dirname(__FILE__).'/bg/'.$bg.'.png';

$this->im_fullbg = imagecreatefrompng($file_bg);

$this->im_bg = imagecreatetruecolor($this->bg_width, $this->bg_height);

imagecopy($this->im_bg,$this->im_fullbg,0,0,0,0,$this->bg_width, $this->bg_height);

$this->im_slide = imagecreatetruecolor($this->mark_width, $this->bg_height);

$_SESSION['tncode_r'] = $this->_x = mt_rand(50,$this->bg_width-$this->mark_width-1);

$_SESSION['tncode_err'] = 0;

$this->_y = mt_rand(0,$this->bg_height-$this->mark_height-1);

}

private function _destroy(){

imagedestroy($this->im);

imagedestroy($this->im_fullbg);

imagedestroy($this->im_bg);

imagedestroy($this->im_slide);

}

private function _imgout(){

if(!$_GET['nowebp']&&function_exists('imagewebp')){//优先webp格式，超高压缩率

$type = 'webp';

$quality = 40;//图片质量 0-100

}else{

$type = 'png';

$quality = 7;//图片质量 0-9

}

header('Content-Type: image/'.$type);

$func = "image".$type;

$func($this->im,null,$quality);

}

private function _merge(){

$this->im = imagecreatetruecolor($this->bg_width, $this->bg_height*3);

imagecopy($this->im, $this->im_bg,0, 0 , 0, 0, $this->bg_width, $this->bg_height);

imagecopy($this->im, $this->im_slide,0, $this->bg_height , 0, 0, $this->mark_width, $this->bg_height);

imagecopy($this->im, $this->im_fullbg,0, $this->bg_height*2 , 0, 0, $this->bg_width, $this->bg_height);

imagecolortransparent($this->im,0);//16777215

}

private function _createBg(){

$file_mark = dirname(__FILE__).'/img/mark.png';

$im = imagecreatefrompng($file_mark);

header('Content-Type: image/png');

//imagealphablending( $im, true);

imagecolortransparent($im,0);//16777215

//imagepng($im);exit;

imagecopy($this->im_bg, $im, $this->_x, $this->_y , 0 , 0 , $this->mark_width, $this->mark_height);

imagedestroy($im);

}

private function _createSlide(){

$file_mark = dirname(__FILE__).'/img/mark2.png';

$img_mark = imagecreatefrompng($file_mark);

imagecopy($this->im_slide, $this->im_fullbg,0, $this->_y , $this->_x, $this->_y, $this->mark_width, $this->mark_height);

imagecopy($this->im_slide, $img_mark,0, $this->_y , 0, 0, $this->mark_width, $this->mark_height);

imagecolortransparent($this->im_slide,0);//16777215

//header('Content-Type: image/png');

//imagepng($this->im_slide);exit;

imagedestroy($img_mark);

}