<?php
/**
 * Template Name: 图片验证码
 *
 */

class OCW_Imagecode{
    private $width ;
    private $height;
    private $counts;
    private $distrubcode;
    private $fonturl;
    private $session;
    function __construct($width = 120,$height = 30,$counts = 5,$distrubcode="1235467890qwertyuipkjhgfdaszxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM",$fonturl){
        $this->width=$width;
        $this->height=$height;
        $this->counts=$counts;
        $this->distrubcode=empty($distrubcode)?"1235467890qwertyuipkjhgfdaszxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM":$distrubcode;
        $this->fonturl=$fonturl;
        $this->session=$this->sessioncode();
        session_start();
        $_SESSION['ocw_captcha']=$this->session;
    }

     function imageout(){
        $im=$this->createimagesource();
        $this->setbackgroundcolor($im);
        $this->set_code($im);
        $this->setdistrubecode($im);
        ImageGIF($im);
        ImageDestroy($im);
    }

    private function createimagesource(){
        return imagecreate($this->width,$this->height);
    }
    private function setbackgroundcolor($im){
        $bgcolor = ImageColorAllocate($im, rand(200,255),rand(200,255),rand(200,255));
        imagefill($im,0,0,$bgcolor);
    }
    private function setdistrubecode($im){
        $count_h=$this->height;
        $cou=floor($count_h*2);
        for($i=0;$i<$cou;$i++){
            $x=rand(0,$this->width);
            $y=rand(0,$this->height);
            $jiaodu=rand(0,360);
            $fontsize=rand(4,6);
            $fonturl=$this->fonturl;
            $originalcode = $this->distrubcode;
            $countdistrub = strlen($originalcode);
            $dscode = $originalcode[rand(0,$countdistrub-1)];
            $color = ImageColorAllocate($im, rand(40,140),rand(40,140),rand(40,140));
            imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$dscode);

        }
    }
    private function set_code($im){
            $width=$this->width;
            $counts=$this->counts;
            $height=$this->height;
            $scode=$this->session;
            $y=floor($height/2)+floor($height/4);
            $fontsize=rand(20,25);
            $fonturl=$this->fonturl;

            $counts=$this->counts;
            for($i=0;$i<$counts;$i++){
                $char=$scode[$i];
                $x=floor($width/$counts)*$i+8;
                $jiaodu=rand(-20,30);
                $color = ImageColorAllocate($im,rand(0,50),rand(50,100),rand(100,140));
                imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$char);

            }



    }
    private function sessioncode(){
            $originalcode = $this->distrubcode;
            $countdistrub = strlen($originalcode);
            $_dscode = "";
            $counts=$this->counts;
            for($j=0;$j<$counts;$j++){
                $dscode = $originalcode[rand(0,$countdistrub-1)];
                $_dscode.=$dscode;
            }
            return $_dscode;

    }
}