signaturefield.module in SignatureField 6

Signature Field module.

File

signaturefield.module

<?php

/**
 * @file
 * Signature Field module.
 */

/**
 * Implements hook_init().
 */
function signaturefield_init() {
  foreach (module_list() as $module) {
    if (file_exists($file = dirname(__FILE__) . "/modules/{$module}.inc")) {
      require_once $file;
    }
  }
}
function signaturefield_json_to_image($element, $json) {
  $src_image = imagecreatetruecolor($element['#width'] * 12, $element['#height'] * 12);
  $color = _signaturefield_hex2rgb($element['#color']);
  $bg = imagecolorallocatealpha($src_image, 0, 0, 0, 127);
  $pen = imagecolorallocate($src_image, $color[0], $color[1], $color[2]);
  imagefill($src_image, 0, 0, $bg);
  $json = is_string($json) ? json_decode($json) : $json;
  foreach ($json as $coord) {
    signaturefield_drawline($src_image, $coord->lx * 12, $coord->ly * 12, $coord->mx * 12, $coord->my * 12, $pen, 2 * (12 / 2));
  }

  // Preserve transparency settings.
  imagealphablending($src_image, TRUE);
  imagesavealpha($src_image, TRUE);
  $dest_image = imagecreatetruecolor($element['#width'], $element['#height']);
  $bg = imagecolorallocatealpha($dest_image, 0, 0, 0, 127);
  imagefill($dest_image, 0, 0, $bg);

  // Preserve transparency settings.
  imagealphablending($dest_image, TRUE);
  imagesavealpha($dest_image, TRUE);
  imagecopyresampled($dest_image, $src_image, 0, 0, 0, 0, $element['#width'], $element['#width'], $element['#width'] * 12, $element['#width'] * 12);
  imagedestroy($src_image);
  $dir = file_directory_path() . '/signaturefield';
  if (file_check_directory($dir, FILE_CREATE_DIRECTORY)) {
    $filepath = "{$dir}/" . time() . rand(1000, 9999) . '.png';
    imagepng($dest_image, $filepath);
    imagedestroy($dest_image);
    return serialize(array(
      'json' => json_encode($json),
      'filepath' => $filepath,
    ));
  }
  return FALSE;
}

/**
* Draws a thick line
* Changing the thickness of a line using imagesetthickness doesn't produce as nice of result
*
* @param object $src_image
* @param int $startX
* @param int $startY
* @param int $endX
* @param int $endY
* @param object $colour
* @param int $thickness
*
* @return void
*/
function signaturefield_drawline($src_image, $startX, $startY, $endX, $endY, $color, $thickness) {
  $angle = atan2($startY - $endY, $endX - $startX);
  $dist_x = $thickness * sin($angle);
  $dist_y = $thickness * cos($angle);
  $x1 = ceil($startX + $dist_x);
  $y1 = ceil($startY + $dist_y);
  $x2 = ceil($endX + $dist_x);
  $y2 = ceil($endY + $dist_y);
  $x3 = ceil($endX - $dist_x);
  $y3 = ceil($endY - $dist_y);
  $x4 = ceil($startX - $dist_x);
  $y4 = ceil($startY - $dist_y);
  $array = array(
    $x1,
    $y1,
    $x2,
    $y2,
    $x3,
    $y3,
    $x4,
    $y4,
  );
  imagefilledpolygon($src_image, $array, count($array) / 2, $color);
}

/**
 *  Convert a hex color representation to it's rgb integer components.
 *
 *  @param $hex
 *    Hex representation of the color.
 *    Can be in the formats: '#ABC','ABC','#AABBCC','AABBCC'
 *  @return
 *    Array with three components RGB.
 */
function _signaturefield_hex2rgb($hex) {
  $r = $g = $b = '';
  $hex = ltrim($hex, '#');
  if (preg_match('/^[0-9a-f]{3}$/i', $hex)) {

    // 'FA3' is the same as 'FFAA33' so r=FF, g=AA, b=33
    $r = str_repeat($hex[0], 2);
    $g = str_repeat($hex[1], 2);
    $b = str_repeat($hex[2], 2);
  }
  elseif (preg_match('/^[0-9a-f]{6}$/i', $hex)) {

    // #FFAA33 or r=FF, g=AA, b=33
    $r = drupal_substr($hex, 0, 2);
    $g = drupal_substr($hex, 2, 2);
    $b = drupal_substr($hex, 4, 2);
  }
  $r = hexdec($r);
  $g = hexdec($g);
  $b = hexdec($b);
  return array(
    $r,
    $g,
    $b,
  );
}

Functions

Name	Description
signaturefield_drawline	Draws a thick line Changing the thickness of a line using imagesetthickness doesn't produce as nice of result
signaturefield_init	Implements hook_init().
signaturefield_json_to_image
_signaturefield_hex2rgb	Convert a hex color representation to it's rgb integer components.