<?php
 
  class Captcha4d
  {
	 const CHARS = 'WEafRTYIPAGHJKXBNM3479j';
	  protected $hypot = 5;
	  protected $image = null;
	  protected $_sin = array();
	  protected $text = '';
 
	  public function __construct()
	  {
	  $this->time = microtime(true);
	  $this->generateCode();
 
	  }
	   protected function generateCode()
	  {
 
 
	  $this->text = 'aG5';
 
	  }
 
	  public function getText()
	  {
	  return $this->text;
	  }
 
	  protected function getProection($x, $y, $z)
	  {
 
	  $xx = 0.70710;
	  $xz = 0.70710;
	  $xy = 0.70710;
 
	  $yx = 0.40824;
	  $yz = 0.81649;
	  $yy = -0.40824;
 
	  $cx = $xx*$x + $xy*$y + $xz*$z - 5;
	  $cy = $yx*$x + $yy*$y + $yz*$z + 20;
	  return array(
	  'x' => $cx * $this->hypot,
	  'y' => $cy * $this->hypot
	  );
	  } 
 
 
	  function zFunction($x,$y){
	  $z = imagecolorat($this->image,$y/2,$x/2)>0?3:0;
	  if( $z != 0 ){
	  $z += -2+ 2*
	  $this->_sin[($x+$this->startX)%30];
 
	  $this->_sin[($y+$this->startY)%30];
	  }
	  $z += mt_rand(0,30)/50;
	  return $z;
	  }
 
  public function render()
  {
 
  $xx = 30;
  $yy = 60;
 
 
  $animation = new Imagick();
  $animation->setFormat( "gif" );
 
 
  $cw = new ImagickPixel("white");
  $cb = new ImagickPixel("black");
 
  $this->image = imageCreateTrueColor(100, 20);
 
  $whiteColor = imageColorAllocate($this->image,255,255,255);
   imageFilledRectangle($this->image,0,0,$yy * $this->hypot , $xx * $this->hypot, $whiteColor);
  $textColor = imageColorAllocate($this->image,0,0,0);
  imageString($this->image, 5, 3, 0, $this->text, $textColor);
 
  $cof = 2*3.141592654/$xx;
  for($x = 0; $x < $xx + 1; $x++){
  $this->_sin[$x] = sin($x*$cof);
  }
  $this->startX = mt_rand(0,$xx);
  $this->startY = mt_rand(0,$yy);
 
  $draw = new ImagickDraw();
  $countFrame = 25;
 
  for ( $i = 0; $i < $countFrame; $i++ ) {
  $this->startX += $xx / $countFrame;
 
  $coordinates = array();
  for($x = 0; $x < $xx + 1; $x++){
  for($y = 0; $y < $yy + 1; $y++){
  $coordinates[$x][$y] = $this->getProection($x,$y,$this->zFunction($x,$y));
  }
  }
 
 
  $animation->newImage( $yy * $this->hypot , $xx * $this->hypot, $cw);
 
  $im = new ImagickDraw();
  $im->setFillColor($cw);
  $im->setStrokeColor($cb);
  $im->setStrokeAntialias(true);
  for($x = 0; $x < $xx; $x++){
  for($y = 0; $y < $yy; $y++){
  $coord = array();
  $coord[] = $coordinates[$x][$y];
  $coord[] = $coordinates[$x+1][$y];
  $coord[] = $coordinates[$x+1][$y+1];
  $coord[] = $coordinates[$x][$y+1];
 
  $im->polygon($coord);
  }
  }
  $animation->drawImage($im);
  $animation->setImageDelay( 100/$countFrame );
  }
 
  header( "Content-Type: image/gif" );
  echo $animation->getImagesBlob();die();
 
  }
  }
 
  $captcha = new Captcha4d();
  $captcha->render();
?>