protected function CaptchaImageResponse::addDots in CAPTCHA 8

Add random noise dots to image with given color.

Parameters

resource $image: Link to image stream resource.

int $width: Suggested output image width.

int $height: Suggested input image width.

array $colors: Font color.

1 call to CaptchaImageResponse::addDots()

CaptchaImageResponse::generateImage in image_captcha/src/Response/CaptchaImageResponse.php

Base function for generating a image CAPTCHA.

File

image_captcha/src/Response/CaptchaImageResponse.php, line 326

Class

CaptchaImageResponse

Response which is returned as the captcha for image_captcha.

Namespace

Drupal\image_captcha\Response

Code

protected function addDots(&$image, $width, $height, array $colors) {
  $noise_quantity = $width * $height * (int) $this->config
    ->get('image_captcha_noise_level') / 10.0;
  for ($i = 0; $i < $noise_quantity; $i++) {
    imagesetpixel($image, mt_rand(0, $width), mt_rand(0, $height), $colors[array_rand($colors)]);
  }
}