<?php
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFEncoder Version 2.0 by László Zsidi, http://gifs.hu
::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
*/
include "GIFEncoder.class.php";
 
class Captcha
{
	protected $captcha;
	protected $clave;
 
	function __construct()
	{
		$rnd = rand(0, 1000000);
		$key = strtoupper(substr(md5( microtime() * $rnd),1,5));
		$this->clave = $key;
		$this->captcha = imagecreatefromgif('bg.gif');
		$posicion_x=15;
		for($i = 0;$i<strlen($key);$i++){
			$r=rand(0,255);
			$g=rand(0,255);
			$b=rand(0,255);
			$posicion_y=rand(20,40);
			$colorText = imagecolorallocate($this->captcha, $r, $g, $b);
			imagestring($this->captcha, 30, $posicion_x, $posicion_y, $key[$i], $colorText);
			$posicion_x+=25;
		}
		//Fix con el color de la segunda letra
		$white = ImageColorAllocate($this->captcha,0,0,0);
		ImageColorTransparent($this->captcha,$white);
	}
 
	public function imprimir()
	{
		if (!empty($this->frames) AND !empty($this->framed))
		{
			$gif = new GIFEncoder($this->frames, $this->framed, 0, 2, 0, 0, 0, 'url');
			Header ('Content-type:image/gif');
			echo $gif->GetAnimation();
			imagedestroy($this->captcha);
		}else{
			Header('Content-type:image/gif');
			imagegif($this->captcha);
		}
 
	}
 
	public function guardar()
	{
		$_SESSION['CAPTCHA_TEXT'] = $this->clave;
		return $this->clave;
	}
}
 
class Animacion extends Captcha
{
	public $frames;
	public $framed;
 
	function __construct($aleatorio = 1)
	{
		parent::__construct();
		if ($aleatorio == 1) {
			$n = rand(1,3);
			$n == 1 ? $this->circulo() : 'no' ;
			$n == 2 ? $this->bum() : 'no' ;
			$n == 3 ? $this->desliz() : 'no' ;
		}
	}
 
	public function circulo()
	{
		$circulo_x = 40;
		$circulo_y = 0;
		$frames_x = 20;
		for($b=0;$b<$frames_x;$b++){
			$im = imagecreatetruecolor(150, 80);
			imagecopy($im, $this->captcha, 0, 0, 0, 0, imagesx($this->captcha), imagesy($this->captcha));
			//fix
			$white = ImageColorAllocate($im,255,255,255);
			ImageFill($im,0,0,$white);
			$circulo = imagecolorallocate($im, 0, 0, 0);
			imagefilledellipse( $im, $circulo_y, $circulo_x, 30, 30, $circulo );
			$fname = 'tmp/'.$b.'.gif';
			imagegif($im, $fname);
			$this->frames[] = $fname;
			$this->framed[] = 1;
			$circulo_y+=10;
			imagedestroy($im);
		}
		$this->imprimir();
	}
 
	public function bum()
	{
		$frames_x = 30;
		for($b=0;$b<$frames_x;$b++){
			$im = imagecreatetruecolor(150, 80);
			imagecopy($im, $this->captcha, 0, 0, 0, 0, imagesx($this->captcha), imagesy($this->captcha));
			//fix
			$white = ImageColorAllocate($im,255,255,255);
			ImageFill($im,0,0,$white);
			imagefilledrectangle($im,($b*5),($b*5),10+($b*5),10+($b*5),0);
			imagefilledrectangle($im,($b*1),($b*5),10+($b*1),10+($b*5),0);
			imagefilledrectangle($im,($b*3)*2,($b*1)+$b,10+($b*3)*2,10+($b*1)+$b,0);
			imagefilledrectangle($im,($b*4)*2,($b*2)+$b,10+($b*4)*2,10+($b*2)+$b,0);
			$fname = 'tmp/'.$b.'.gif';
			imagegif($im, $fname);
			$this->frames[] = $fname;
			$this->framed[] = 1;
			imagedestroy($im);
		}
		$this->imprimir();
	}
 
	public function desliz()
	{
		$imgwidth = imagesx($this->captcha);
		$imgheight = imagesy($this->captcha);
		$frames_x = 30;
		for($b=0;$b<$frames_x;$b++){
			$im = imagecreatetruecolor(150, 80);
			imagecopy($im, $this->captcha, 0, 0, 0, 0, imagesx($this->captcha), imagesy($this->captcha));
			//fix
			$white = ImageColorAllocate($im,255,255,255);
			ImageFill($im,0,0,$white);
			imagefilledrectangle($im,($b - 1) * 8 + 8,1,$imgwidth,$imgheight, 0);
			$fname = 'tmp/'.$b.'.gif';
			imagegif($im, $fname);
			$this->frames[] = $fname;
			$this->framed[] = 1;
			imagedestroy($im);
		}
		$this->imprimir();
	}
}
 
// Animacion aleatoria
$showtime = new Animacion();
//$showtime->guardar();
 
// Seleccionar animacion
//$showtime = new Animacion(0);
//$showtime->bum();
 
// Sin animacion
//$showtime = new Captcha();
//$showtime->imprimir();
 
?>