/**
* hue to Alternate hue
*/
function h2ah($hue)
{
if (is_array($hue))
{
$hue[0] = colour_manager::h2ah($hue[0]);
return $hue;
}
colour_manager::normalize_hue($hue);
// blue through red is already ok
if ($hue >= 240)
{
return $hue;
}
else if ($hue <= 60)
{
return $hue * 2;
}
else if ($hue <= 120)
{
return $hue + 60;
}
else
{
return ($hue + 240) / 2;
}
}
/**
* Create the image containing $code with a seed of $seed
*/
function execute($code, $seed)
{
global $config;
mt_srand($seed);
// Create image
$img = imagecreatetruecolor($this->width, $this->height);
// Generate colours
$colour = new colour_manager($img, array('random' => true, 'min_value' => 60), 'hsv');
$scheme = $colour->colour_scheme('background', false);
$scheme = $colour->mono_range($scheme, 10, false);
shuffle($scheme);
$bg_colours = array_splice($scheme, mt_rand(6, 12));
// Generate code characters
$characters = $sizes = $bounding_boxes = $noise = array();
$width_avail = $this->width - 15;
$code_len = strlen($code);
$captcha_bitmaps = $this->captcha_bitmaps();
for ($i = 0; $i < $code_len; ++$i) {
$characters[$i] = new char_cube3d($captcha_bitmaps, $code[$i]);
list($min, $max) = $characters[$i]->range();
$sizes[$i] = mt_rand($min, $max);
$box = $characters[$i]->dimensions($sizes[$i]);
$width_avail -= $box[2] - $box[0];
$bounding_boxes[$i] = $box;
}
// Redistribute leftover x-space
$offset = array();
for ($i = 0; $i < $code_len; ++$i) {
$denom = $code_len - $i;
$denom = max(1.3, $denom);
$offset[$i] = src_mt_rand(0, (int) round(1.5 * $width_avail / $denom));
$width_avail -= $offset[$i];
}
if ($config['captcha_gd_x_grid']) {
$grid = (int) $config['captcha_gd_x_grid'];
for ($y = 0; $y < $this->height; $y += mt_rand($grid - 2, $grid + 2)) {
$current_colour = $scheme[array_rand($scheme)];
imageline($img, mt_rand(0, 4), mt_rand($y - 3, $y), mt_rand($this->width - 5, $this->width), mt_rand($y - 3, $y), $current_colour);
}
}
if ($config['captcha_gd_y_grid']) {
$grid = (int) $config['captcha_gd_y_grid'];
for ($x = 0; $x < $this->width; $x += mt_rand($grid - 2, $grid + 2)) {
$current_colour = $scheme[array_rand($scheme)];
imagedashedline($img, mt_rand($x - 3, $x + 3), mt_rand(0, 4), mt_rand($x - 3, $x + 3), mt_rand($this->height - 5, $this->height), $current_colour);
}
}
if ($config['captcha_gd_wave'] && ($config['captcha_gd_y_grid'] || $config['captcha_gd_y_grid'])) {
$this->wave($img);
}
if ($config['captcha_gd_3d_noise']) {
$xoffset = mt_rand(0, 9);
$noise_bitmaps = $this->captcha_noise_bg_bitmaps();
for ($i = 0; $i < $code_len; ++$i) {
$noise[$i] = new char_cube3d($noise_bitmaps, mt_rand(1, sizeof($noise_bitmaps['data'])));
list($min, $max) = $noise[$i]->range();
//$box = $noise[$i]->dimensions($sizes[$i]);
}
$xoffset = 0;
for ($i = 0; $i < $code_len; ++$i) {
$dimm = $bounding_boxes[$i];
$xoffset += $offset[$i] - $dimm[0];
$yoffset = mt_rand(-$dimm[1], $this->height - $dimm[3]);
$noise[$i]->drawchar($sizes[$i], $xoffset, $yoffset, $img, $colour->get_resource('background'), $scheme);
$xoffset += $dimm[2];
}
}
$xoffset = 5;
for ($i = 0; $i < $code_len; ++$i) {
$dimm = $bounding_boxes[$i];
$xoffset += $offset[$i] - $dimm[0];
$yoffset = mt_rand(-$dimm[1], $this->height - $dimm[3]);
$characters[$i]->drawchar($sizes[$i], $xoffset, $yoffset, $img, $colour->get_resource('background'), $scheme);
$xoffset += $dimm[2];
}
if ($config['captcha_gd_wave']) {
$this->wave($img);
}
if ($config['captcha_gd_foreground_noise']) {
$this->noise_line($img, 0, 0, $this->width, $this->height, $colour->get_resource('background'), $scheme, $bg_colours);
}
// Send image
header('Content-Type: image/png');
header('Cache-control: no-cache, no-store');
imagepng($img);
imagedestroy($img);
}
