It would be nice to have a possibility to configure the Captcha system more deeply. I think every site has a specially designed registration form or comment sending system, where the layout of the Captcha picture should differ. I mean the colors, size, etc. Personally I had to modify the angle of the generated text to fit it in the picture, because the default setting does not allow to long words to look well. So, I had to hack the code to make this possible, and when I am upgrading to a new version or build, I had to make those changes again.
These are my changes in the \system\core\core.functions.php file:
/**—————————————————-
/** Generate Captcha
/**—————————————————-*/
...
$font_size = 16;
$expiration = 60*60*2; // 2 hours
$img_width = 140; // Image width
$img_height = 30; // Image height
...
/**—————————————————-
/** Determine angle and position
/**—————————————————-*/
$length = strlen($word);
$angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
$x_axis = rand(6, (360/$length)-16);
$y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
/**—————————————————-
/** Create image
/**—————————————————-*/
$im = ImageCreate($img_width, $img_height);
/**—————————————————-
/** Assign colors
/**—————————————————-*/
$bg_color = ImageColorAllocate($im, 255, 255, 255);
$border_color = ImageColorAllocate($im, 153, 102, 102);
$text_color = ImageColorAllocate($im, 204, 153, 153);
$grid_color = imagecolorallocate($im, 255, 182, 182);
$shadow_color = imagecolorallocate($im, 255, 240, 240);
/**—————————————————-
/** Create the rectangle
/**—————————————————-*/
ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
/**—————————————————-
/** Create the spiral pattern
/**—————————————————-*/
$theta = 1;
$thetac = 6;
$radius = 12;
$circles = 20;
$points = 36;
Sorry for pasting it here without CODE styling, but I had to highlight the changes.
