$yy = $y * 5 + $dy - 50;
$x1 = cos($arg) * $xx - sin($arg) * $yy + 25;
$y1 = sin($arg) * $xx + cos($arg) * $yy + 50;
imagesetpixel($img, $x0 + $x1, $y0 + $y1, $color);
}
}
}
imagedestroy($da);
}
for ($j = 0; $j < 800; $j++) {
$rx = mt_rand(0, 400);
$ry = mt_rand(0, 100);
imagesetpixel($im, $rx, $ry, $color);
}
for ($i = 0; $i < 7; $i++) {
imagecharx($im, substr($code, $i, 1), $i * 43 + 25, 0, $ylist);
}
$current = 0;
$d = 1;
for ($j = 0; $j < 300; $j += 10) {
if ($current > 30) {
$d = -1;
} else {
if ($current < -30) {
$d = 1;
} else {
if (mt_rand(0, 400) < 70) {
$d = -$d;
}
}
}
function getCaptcha()
{
$str = "1,3,4,6,7,9,A,C,D,E,F,H,K,M,N,P,Q,R,T,W,X,Y";
$list = explode(",", $str);
$cmax = count($list) - 1;
$code = '';
for ($i = 0; $i < 7; $i++) {
$randnum = mt_rand(0, $cmax);
$code .= $list[$randnum];
}
ob_start();
$im = @imagecreate(350, 90) or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 0, 0, 0);
$color = imagecolorallocate($im, 255, 255, 255);
$ylist = @array(400);
$current = 0;
$d = 1;
for ($j = 0; $j < 400; $j++) {
if ($current > 10) {
$d = -1;
} else {
if ($current < -10) {
$d = 1;
} else {
if (mt_rand(0, 400) < 200) {
$d = -$d;
}
}
}
if (mt_rand(0, 400) < 350) {
$current = $current + $d;
}
$ylist[$j] = $current;
}
function imagecharx($img, $char, $x0, $y0, $ylist)
{
$da = @imagecreate(10, 20) or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($da, 50, 50, 50);
$text_color = imagecolorallocate($da, 255, 255, 255);
$color = imagecolorallocate($img, 255, 255, 255);
$arg = rand(0, 7) / 100.0 * pi();
imagestring($da, 10, 0, 0, $char, $text_color);
for ($i = 0; $i < 200; $i++) {
$y = @floor($i / 10);
$x = $i % 10;
$point_color = imagecolorat($da, $x, $y);
if ($point_color == $text_color) {
for ($j = 0; $j < 7; $j++) {
$dx = 0;
$dy = 0;
$p = 6;
for ($s = 0; $s < $p; $s++) {
$dx += rand(0, 1000 / $p) / 100;
$dy += rand(0, 1000 / $p) / 100;
}
$xx = $x * 5 + $dx - 25;
$yy = $y * 5 + $dy - 50;
$x1 = cos($arg) * $xx - sin($arg) * $yy + 25;
$y1 = sin($arg) * $xx + cos($arg) * $yy + 50;
imagesetpixel($img, $x0 + $x1, $y0 + $y1, $color);
}
}
}
imagedestroy($da);
}
for ($j = 0; $j < 800; $j++) {
$rx = mt_rand(0, 400);
$ry = mt_rand(0, 100);
imagesetpixel($im, $rx, $ry, $color);
}
for ($i = 0; $i < 7; $i++) {
imagecharx($im, substr($code, $i, 1), $i * 43 + 25, 0, $ylist);
}
$current = 0;
$d = 1;
for ($j = 0; $j < 400; $j += 10) {
if ($current > 30) {
$d = -1;
} else {
if ($current < -30) {
$d = 1;
} else {
if (mt_rand(0, 400) < 70) {
$d = -$d;
}
}
}
if (mt_rand(0, 400) < 380) {
$current = $current + $d;
}
for ($l = 0; $l < 10; $l++) {
$dx = 0;
$dy = 0;
$p = 2;
for ($s = 0; $s < $p; $s++) {
$dx += rand(0, 1000 / $p) / 100;
$dy += rand(0, 1000 / $p) / 100;
}
imagesetpixel($im, $j + $dy, 40 + $dx + $current, $color);
}
}
imagepng($im);
imagedestroy($im);
$gifdata = ob_get_contents();
ob_end_clean();
return array('question' => 'data:image/gif;base64,' . base64_encode($gifdata), 'answer' => $code);
}
