image_generate.module in Image 6

image_generate.module

Adds an image and builds derivatives when devel generate creates image nodes. Attaches image to node types with image attach enabled.

File

contrib/image_generate/image_generate.module

<?php

/**
 * @file image_generate.module
 *
 * Adds an image and builds derivatives when devel generate creates image nodes.
 * Attaches image to node types with image attach enabled.
 */

/**
 * Implementation of hook_nodeapi().
 */
function image_generate_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
  if (isset($node->devel_generate)) {
    if ($op == 'presave') {
      if ($node->type == 'image') {
        $size = image_get_sizes(IMAGE_ORIGINAL);
        if (empty($size['width']) || empty($size['height'])) {

          // If we don't have a max size, make one up.
          $max_width = 800;
          $max_height = 800;
        }
        else {
          $max_width = $size['width'];
          $max_height = $size['height'];
        }
        $width = rand((int) 100, (int) $max_width);
        $height = rand((int) 100, (int) $max_height);
        $temp_image = _image_generate_image('png', $width, $height);
        $size = IMAGE_ORIGINAL;

        // Add the tempfile to the node, which is what image does when an image
        // is uploaded. This will be deleted when image generates derivatives.
        $node->images[$size] = $temp_image;
      }
    }
    if ($op == 'insert') {
      if (module_exists('image_attach')) {
        if (variable_get('image_attach_' . $node->type, 0)) {

          // Load an array of images to attach. Unset the "None" option.
          $images = _image_attach_get_image_nodes();
          unset($images[0]);
          if (count($images)) {

            // Get a random number of attachments up to the maximum possible for
            // this node type.
            $attachments = rand(1, variable_get('image_attach_maximum_' . $node->type, 1));
            $weight = 0;

            // Insert a random image node id and increment the weight.
            for ($i = 1; $i <= $attachments; $i++) {
              db_query("INSERT INTO {image_attach} (nid, iid, weight) VALUES (%d, %d, %d)", $node->nid, array_rand($images), $weight++);
            }
          }
          else {
            drupal_set_message(t('No images were attached to generated nodes because there are no image nodes to attach.'));
          }
        }
      }
    }
  }
}

/**
 * Private function for creating a random image.
 *
 * This function only works with the GD toolkit. ImageMagick is not supported.
 *
 * Based on _filefield_generate_image().
 */
function _image_generate_image($extension = 'png', $min_resolution, $max_resolution) {
  static $images = array();

  // Generate a max of 5 different images.
  if (!isset($images[$extension][$min_resolution][$max_resolution]) || count($images[$extension][$min_resolution][$max_resolution]) < 5) {
    if ($temp_file = tempnam(file_directory_temp(), 'filefield_')) {
      dsm($temp_file);
      file_move($temp_file, $temp_file . '.' . $extension);
      $min = explode('x', $min_resolution);
      $max = explode('x', $max_resolution);
      $width = rand((int) $min[0], (int) $max[0]);
      $height = rand((int) $min[0], (int) $max[0]);

      // Make a image split into 4 sections with random colors.
      $im = imagecreate($width, $height);
      for ($n = 0; $n < 4; $n++) {
        $color = imagecolorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
        $x = $width / 2 * ($n % 2);
        $y = $height / 2 * (int) ($n >= 2);
        imagefilledrectangle($im, $x, $y, $x + $width / 2, $y + $height / 2, $color);
      }

      // Make a perfect circle in the image middle.
      $color = imagecolorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
      $smaller_dimension = min($width, $height);
      $smaller_dimension = $smaller_dimension % 2 ? $smaller_dimension : $smaller_dimension;
      imageellipse($im, $width / 2, $height / 2, $smaller_dimension, $smaller_dimension, $color);
      $save_function = 'image' . ($extension == 'jpg' ? 'jpeg' : $extension);
      $save_function($im, $temp_file);
      $images[$extension][$min_resolution][$max_resolution][$temp_file] = $temp_file;
    }
  }
  else {
    $temp_file = array_rand($images[$extension][$min_resolution][$max_resolution]);
  }
  return $temp_file;
}

Functions

Name	Description
image_generate_nodeapi	Implementation of hook_nodeapi().
_image_generate_image	Private function for creating a random image.