3D captcha - Полезный php код №76

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Код:

<?php 
/* 3D Captcha */ 
  
/* 
Реализация 
капчи, все четко и ничего лишнего, в стиле ооп 
*/ 
  
$capthca = new Capthca3d(); 
$capthca->render(); 
  
  
class Capthca3d{ 
const CHARS = 'WEafRTYIPAGHJKXBNM3479j'; 
protected $hypot = 8; 
protected $image = null; 
  
protected $text = ''; 
  
public function __construct() 
{ 
$this->time = microtime(true); 
$this->generateCode(); 
  
} 
protected function generateCode() 
{ 
$chars = self::CHARS; 
for($i =0; $i<3; $i++){ 
$this->text .= $chars{ mt_rand(0,22)}; 
} 
} 
  
public function getText() 
{ 
return $this->text; 
} 
protected function getProection($x1,$y1,$z1) 
{ 
$x = $x1 * $this->hypot; 
$y = $z1 * $this->hypot; 
$z = -$y1 * $this->hypot; 
  
$xx = 0.707106781187; 
$xy = 0; 
$xz = -0.707106781187; 
  
$yx = 0.408248290464; 
$yy = 0.816496580928; 
$yz = 0.408248290464; 
  
$cx = $xx*$x + $xy*$y + $xz*$z; 
$cy = $yx*$x + $yy*$y + $yz*$z+ 20 * $this->hypot; 
return array( 
'x' => $cx, 
'y' => $cy 
); 
} 
  
function zFunction($x,$y){ 
$z = imagecolorat($this->image,$y/2,$x/2)>0?2.6:0; 
if( $z != 0 ){ 
$z += mt_rand(0,60)/100; 
} 
$z += 1.4 * sin(($x+$this->startX)*3.141592654/15)*sin(($y+$this->startY)*3.141592654/15); 
return $z; 
} 
public function render() 
{ 
$xx =30; 
$yy =60; 
  
$this->image = imageCreateTrueColor($yy * $this->hypot , $xx * $this->hypot); 
  
$whiteColor = imageColorAllocate($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); 
  
  
$this->startX = mt_rand(0,$xx); 
$this->startY = mt_rand(0,$yy); 
  
$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)); 
} 
} 
  
for($x = 0; $x < $xx; $x++){ 
for($y = 0; $y < $yy; $y++){ 
$coord = array(); 
$coord[] = $coordinates[$x][$y]['x']; 
$coord[] = $coordinates[$x][$y]['y']; 
  
$coord[] = $coordinates[$x+1][$y]['x']; 
$coord[] = $coordinates[$x+1][$y]['y']; 
  
$coord[] = $coordinates[$x+1][$y+1]['x']; 
$coord[] = $coordinates[$x+1][$y+1]['y']; 
  
$coord[] = $coordinates[$x][$y+1]['x']; 
$coord[] = $coordinates[$x][$y+1]['y']; 
  
$c = (int) ($this->zFunction($x,$y)*32); 
$linesColor = imageColorAllocate($this->image, $c, $c, $c); 
imageFilledPolygon($this->image, $coord, 4, $whiteColor); 
imagePolygon($this->image, $coord, 4, $linesColor); 
} 
} 
  
$textColor = imageColorAllocate($this->image,0,0,0); 
imageString($this->image, 5, 3, 0, $this->text, $whiteColor); 
imageString($this->image, 1, 3, 0, (microtime(true)-$this->time), $textColor); 
header('Content-Type: image/png'); 
  
imagepng($this->image); 
imagedestroy($this->image); 
} 
} 
  
?>

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