tagging.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Prints attendance info for particular user
 *
 * @package    mod
 * @subpackage attendance
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once(dirname(__FILE__).'/../../config.php');
require_once(dirname(__FILE__).'/locallib.php');
require_once(dirname(__FILE__).'/student_attenance_form.php');

$pageparams = new att_sessions_page_params();

// Check that the required parameters are present.
$id = required_param('sessid', PARAM_INT);
$attendance_session_id = required_param('sessid', PARAM_INT);


$attforsession = $DB->get_record('attendance_sessions', array('id' => $id), '*', MUST_EXIST);
$attendance = $DB->get_record('attendance', array('id' => $attforsession->attendanceid), '*', MUST_EXIST);
$cm = get_coursemodule_from_instance('attendance', $attendance->id, 0, false, MUST_EXIST);
$course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
$coursecontext = context_course::instance($course->id);
// Require the user is logged in.
require_login($course, true, $cm);

$pageparams->sessionid = $id;
$att = new attendance($attendance, $cm, $course, $PAGE->context, $pageparams);

// Require that a session key is passed to this page.
require_sesskey();
$attendance_url = new moodle_url('/mod/attendance/attendance.php', array('sessid' => $id, 'sesskey' => sesskey(), 'id' => $cm->id));


$groupimgs = $DB->get_records('attendance_session_images', array('sessionid' => $id));

$faceimgrec = false;
foreach ($groupimgs as $groupimg) {
    $faceimg = $DB->get_record('attendance_images', array('studentid' => $USER->id, 'groupimg' => $groupimg->groupimg));
    if ($faceimg != false) {
        $faceimgrec = $faceimg;
        break;
    }
}
if ($faceimgrec != false || empty($groupimgs)) {
    redirect($attendance_url);
}

// Figures out which group image is to be used, and if there are previous/next images
$group_image_hashes = array();
foreach ($groupimgs as $groupimg) {
  $group_image_hashes[] = $groupimg->groupimg;
}
sort($group_image_hashes);
if (isset($_GET['imghash']) && ($key = array_search($_GET['imghash'], $group_image_hashes, TRUE)) !== FALSE) {
  $current_group_image_hash = $_GET['imghash'];
} else {
  // First visit or bad hash--just pick the first image and make sure that nothing is done later on the script
  $key = 0;
  $current_group_image_hash = $group_image_hashes[0];
  $_POST['action'] = 'nothing';
}
$taggingurl = new moodle_url('/mod/attendance/tagging.php', array('sessid' => $id, 'sesskey' => sesskey(), 'imghash' => $current_group_image_hash));
$previous_group_image_hash = null;
if ($key > 0) {
  $previous_group_image_hash = $group_image_hashes[$key - 1];
}
$next_group_image_hash = null;
if ($key + 1 < count($group_image_hashes)) {
  $next_group_image_hash = $group_image_hashes[$key + 1];
}

$url = new moodle_url('/mod/attendance/tagging.php', array());
$PAGE->set_url($url);
$PAGE->set_title("Tagging photos");
// use get_string
$PAGE->set_heading("Show us where you are:");
$PAGE->set_cacheable(true);
$PAGE->navbar->add("Tagging");
$dataobject = $DB->get_record('attendance_session_images', array('sessionid' => $id, 'groupimg' => $current_group_image_hash));
if (isset($_POST['action'])) {
  if ($_POST['action'] === 'has_tagged') {
    $rectangle = array();
    $rectangle['x'] = (int) $_POST['x'];
    $rectangle['y'] = (int) $_POST['y'];
    $rectangle['width'] = (int) $_POST['width'];
    $rectangle['height'] = (int) $_POST['height'];
    $records = $DB->get_records('attendance_images', array('groupimg' => $dataobject->groupimg, 'detected' => '1', 'approved' => '0', 'tag' => '0'));
    $best_match = null;
    $best_match_value = (float) 0;
    foreach ($records as $record) {
      $rectangle2 = array();
      $rectangle2['x'] = (int) $record->x;
      $rectangle2['y'] = (int) $record->y;
      $rectangle2['width'] = (int) $record->width;
      $rectangle2['height'] = (int) $record->length;
      $match_value = att_rectangle_intersection_over_union($rectangle, $rectangle2);
      if ($match_value > $best_match_value) {
        $best_match_value = $match_value;
        $best_match = $record->faceimg;
      }
    }
    if ($best_match === null) {
      $no_match = true;
    } else {
      $no_match = false;
    }
  }
  if ($_POST['action'] === 'crop_new_image' || $no_match) {
    $rectangle = array();
    $rectangle['x'] = (int) $_POST['x'];
    $rectangle['y'] = (int) $_POST['y'];
    $rectangle['width'] = (int) $_POST['width'];
    $rectangle['height'] = (int) $_POST['height'];
    $fileinfo = array(
                      'contextid' => $coursecontext->id, // ID of context
                      'component' => 'mod_attendance',     // usually = table name
                      'filearea' => 'myarea',     // usually = table name
                      'itemid' => 0,               // usually = ID of row in table
                      'filepath' => '/',           // any path beginning and ending in /
                      'filename' => $dataobject->groupimg); // any filename
                 
    // Get file
    $fs = get_file_storage();
    $file = $fs->get_file($fileinfo['contextid'], $fileinfo['component'], $fileinfo['filearea'],
                          $fileinfo['itemid'], $fileinfo['filepath'], $fileinfo['filename']);
    $contents = $file->get_content();
    $cropped_image = PICATTENDANCE_crop_image($contents, $rectangle);
    $face_img_name = sha1($cropped_image);
    // Prepare file record object
    $fileinfo = array(
        'contextid' => $coursecontext->id, // ID of context
        'component' => 'mod_attendance',     // usually = table name
        'filearea' => 'myarea',     // usually = table name
        'itemid' => 0,               // usually = ID of row in table
        'filepath' => '/',           // any path beginning and ending in /
        'filename' => $face_img_name); // any filename
    if (!$fs->get_file($fileinfo['contextid'], $fileinfo['component'], $fileinfo['filearea'],
          $fileinfo['itemid'], $fileinfo['filepath'], $fileinfo['filename'])) {
      $fs->create_file_from_string($fileinfo, $cropped_image);
      $fs_record = new stdClass();
      $fs_record->groupimg = $dataobject->groupimg;
      $fs_record->faceimg = $face_img_name;
      $fs_record->approved = 0;
      $fs_record->tag = 1;
      $fs_record->detected = 0;
      $fs_record->x = $rectangle["x"];
      $fs_record->y = $rectangle["y"];
      $fs_record->width = $rectangle["width"];
      $fs_record->length = $rectangle["height"];
      $fs_record->studentid = $USER->id;
      // append
      $lastinsertid = $DB->insert_record('attendance_images', $fs_record, false);
      redirect($attendance_url);
    }
  }
  if ($_POST['action'] === 'use_best_match') {
    $faceimg = $DB->get_record('attendance_images', array('faceimg' => $_POST['hash']));
    $faceimg->studentid = $USER->id;
    $faceimg->tag = 1;
    $DB->update_record('attendance_images', $faceimg);
    redirect($attendance_url);
    // todo: usar imagem ja existente.  $_POST['hash'];
  }
}


$output = $PAGE->get_renderer('mod_attendance');
echo $output->header();
$imageurl = moodle_url::make_pluginfile_url($coursecontext->id, 'mod_attendance', 'myarea', 0, '/', $dataobject->groupimg);
$tagging = new attendance_image_tagging_data($imageurl, $taggingurl);
if ($_POST['action'] === 'has_tagged' && !$no_match) {
  echo html_writer::start_tag('p');
  echo "Awesome! We have found a previously detected face that approximately matches your drawing. Is this your face? If it isn't, don't worry! We can also use the square you've drawn for your tagging istead.";
  echo html_writer::end_tag('p');
  echo html_writer::start_tag('p');
  echo html_writer::empty_tag('img', array('src' => moodle_url::make_pluginfile_url($coursecontext->id, 'mod_attendance', 'myarea', 0, '/', $best_match)));
  echo html_writer::end_tag('p');
  echo html_writer::start_tag('form', array('action' => $taggingurl, 'method' => 'post'));
  echo html_writer::start_tag('button', array('type' => 'submit', 'name' => 'action', 'value' => 'use_best_match'));
  echo "Yes, this is me!";
  echo html_writer::end_tag('button');
  echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'hash', 'value' => $best_match));
  echo html_writer::end_tag('form');
  echo html_writer::start_tag('form', array('action' => $taggingurl, 'method' => 'post'));
  echo html_writer::start_tag('button', array('type' => 'submit', 'name' => 'action', 'value' => 'crop_new_image'));
  echo "No, use the square tag I've drawn!";
  echo html_writer::end_tag('button');
  echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'x', 'value' => $rectangle['x']));
  echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'y', 'value' => $rectangle['y']));
  echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'width', 'value' => $rectangle['width']));
  echo html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'height', 'value' => $rectangle['height']));
  echo html_writer::end_tag('form');
  echo html_writer::start_tag('p');
  echo "If neither option sounds good, feel free to tag yourself again below.";
  echo html_writer::end_tag('p');
} else {
  echo "Please tag your face by drawing a square around it. Please be as precise as possible.";
}
if ($previous_group_image_hash !== null || $next_group_image_hash !== null) {
  echo html_writer::start_tag('p');
  echo "There are other pictures for this same session. If you aren't in this one, try the others! ";
  if ($previous_group_image_hash !== null) {
    echo html_writer::start_tag('a', array('href' => new moodle_url('/mod/attendance/tagging.php', array('sessid' => $id, 'sesskey' => sesskey(), 'imghash' => $previous_group_image_hash))));
    echo "Click here to show the previous image. ";
    echo html_writer::end_tag('a');
  }
  if ($next_group_image_hash !== null) {
    echo html_writer::start_tag('a', array('href' => new moodle_url('/mod/attendance/tagging.php', array('sessid' => $id, 'sesskey' => sesskey(), 'imghash' => $next_group_image_hash))));
    echo "Click here to show the next image.";
    echo html_writer::end_tag('a');
  }
  echo html_writer::end_tag('p');
}
echo $output->render($tagging);
echo $output->footer();