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