<?php
error_reporting(0);
session_start();
$arr=$_SESSION['captcha'][$_GET['session']];
$img=imagecreatetruecolor(112,48);
imagefill($img,0,0,0xFFFFFF);
for($i=0;$i<count($arr);$i++)
{
$color=0;
ereg ("jg.drawLine\(([0-9]+), ([0-9]+), ([0-9]+), ([0-9]+)\);\n", $arr[$i], $regs);
$x1=$regs[1]+1;
$y1=$regs[2]+1;
$x2=$regs[3]+1;
$y2=$regs[4]+1;
imagelinethick($img, $x1, $y1, $x2, $y2, $color, 4);
}
function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1)
{
if ($thick == 1) {
return imageline($image, $x1, $y1, $x2, $y2, $color);
}
$t = $thick/2- 0.5;
if ($x1 == $x2 || $y1 == $y2) {
return imagefilledrectangle($image, round(min($x1, $x2) - $t), round(min($y1, $y2) - $t), round(max($x1, $x2) + $t), round(max($y1, $y2) + $t), $color);
}
$dx=($x2 - $x1) / sqrt(($x2 - $x1)*($x2 - $x1));
$dy=($y2 - $y1) / sqrt(($y2 - $y1)*($y2 - $y1));
$points = array(
round($x1 - $t*$dx), round($y1 + $t*$dy),
round($x1 - $t*$dx), round($y1 - $t*$dy),
round($x1 + $t*$dx), round($y1 - $t*$dy),
round($x2 + $t*$dx), round($y2 - $t*$dy),
round($x2 + $t*$dx), round($y2 + $t*$dy),
round($x2 - $t*$dx), round($y2 + $t*$dy)
);
imagefilledpolygon($image, $points, 6, $color);
return imagepolygon($image, $points, 6, $color);
}
header('Content-type: image/gif');
imagegif($img);
imagedestroy($img);
?>
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