129 lines
3.4 KiB
PHP
129 lines
3.4 KiB
PHP
<?php
|
|
|
|
namespace Gregwar\CaptchaBundle\Generator;
|
|
|
|
/**
|
|
* Generates a CAPTCHA image
|
|
*/
|
|
class CaptchaGenerator {
|
|
|
|
public $value;
|
|
|
|
public function __construct($value)
|
|
{
|
|
$this->value = $value;
|
|
}
|
|
|
|
public function getCode()
|
|
{
|
|
return 'data:image/jpeg;base64,'.base64_encode($this->generate());
|
|
}
|
|
|
|
public function generate()
|
|
{
|
|
$i = imagecreatetruecolor(120,40);
|
|
|
|
$col = imagecolorallocate($i, mt_rand(0,110), mt_rand(0,110), mt_rand(0,110));
|
|
|
|
imagefill($i, 0, 0, 0xFFFFFF);
|
|
|
|
// Draw random lines
|
|
for ($t=0; $t<10; $t++) {
|
|
$tcol = imagecolorallocate($i, 100+mt_rand(0,150), 100+mt_rand(0,150), 100+mt_rand(0,150));
|
|
$Xa = mt_rand(0, 120);
|
|
$Ya = mt_rand(0, 40);
|
|
$Xb = mt_rand(0, 120);
|
|
$Yb = mt_rand(0, 40);
|
|
imageline($i, $Xa, $Ya, $Xb, $Yb, $tcol);
|
|
}
|
|
|
|
// Write CAPTCHA text
|
|
imagettftext($i, 28, 0, 5, 32, $col, dirname(__FILE__).'/Font/captcha.ttf', $this->value);
|
|
|
|
// Distort the image
|
|
$X = mt_rand(0, 120);
|
|
$Y = mt_rand(0, 40);
|
|
$Phase=mt_rand(0,10);
|
|
$Scale = 1.3 + mt_rand(0,10000)/30000;
|
|
$Amp=1+mt_rand(0,1000)/1000;
|
|
$out = imagecreatetruecolor(120,40);
|
|
|
|
for ($x=0; $x<120; $x++)
|
|
for ($y=0; $y<40; $y++) {
|
|
$Vx=$x-$X;
|
|
$Vy=$y-$Y;
|
|
$Vn=sqrt($Vx*$Vx+$Vy*$Vy);
|
|
|
|
if ($Vn!=0) {
|
|
$Vn2=$Vn+4*sin($Vn/8);
|
|
$nX=$X+($Vx*$Vn2/$Vn);
|
|
$nY=$Y+($Vy*$Vn2/$Vn);
|
|
} else {
|
|
$nX=$X;
|
|
$nY=$Y;
|
|
}
|
|
$nY = $nY+$Scale*sin($Phase + $nX*0.2);
|
|
|
|
$p = $this->bilinearInterpolate($nX-floor($nX), $nY-floor($nY),
|
|
$this->getCol($i,floor($nX),floor($nY)),
|
|
$this->getCol($i,ceil($nX),floor($nY)),
|
|
$this->getCol($i,floor($nX),ceil($nY)),
|
|
$this->getCol($i,ceil($nX),ceil($nY)));
|
|
|
|
if ($p==0) {
|
|
$p=0xFFFFFF;
|
|
}
|
|
|
|
imagesetpixel($out, $x, $y, $p);
|
|
}
|
|
|
|
// Renders it
|
|
ob_start();
|
|
imagejpeg($out, null, 15);
|
|
return ob_get_clean();
|
|
}
|
|
|
|
function getCol($image, $x, $y)
|
|
{
|
|
$L = imagesx($image);
|
|
$H = imagesy($image);
|
|
if ($x<0 || $x>=$L || $y<0 || $y>=$H)
|
|
return 0xFFFFFF;
|
|
else return imagecolorat($image, $x, $y);
|
|
}
|
|
|
|
function getRGB($col) {
|
|
return array(
|
|
(int)($col >> 16) & 0xff,
|
|
(int)($col >> 8) & 0xff,
|
|
(int)($col) & 0xff,
|
|
);
|
|
}
|
|
|
|
function bilinearInterpolate($x, $y, $nw, $ne, $sw, $se)
|
|
{
|
|
list($r0, $g0, $b0) = $this->getRGB($nw);
|
|
list($r1, $g1, $b1) = $this->getRGB($ne);
|
|
list($r2, $g2, $b2) = $this->getRGB($sw);
|
|
list($r3, $g3, $b3) = $this->getRGB($se);
|
|
|
|
$cx = 1.0 - $x;
|
|
$cy = 1.0 - $y;
|
|
|
|
$m0 = $cx * $r0 + $x * $r1;
|
|
$m1 = $cx * $r2 + $x * $r3;
|
|
$r = (int)($cy * $m0 + $y * $m1);
|
|
|
|
$m0 = $cx * $g0 + $x * $g1;
|
|
$m1 = $cx * $g2 + $x * $g3;
|
|
$g = (int)($cy * $m0 + $y * $m1);
|
|
|
|
$m0 = $cx * $b0 + $x * $b1;
|
|
$m1 = $cx * $b2 + $x * $b3;
|
|
$b = (int)($cy * $m0 + $y * $m1);
|
|
|
|
return ($r << 16) | ($g << 8) | $b;
|
|
}
|
|
}
|
|
|