[Summary view]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Question behaviour where the student can submit questions one at a
  19   * time for immediate feedback, with certainty based marking.
  20   *
  21   * @package    qbehaviour
  22   * @subpackage immediatecbm
  23   * @copyright  2009 The Open University
  24   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25   */
  26  
  27  
  28  defined('MOODLE_INTERNAL') || die();
  29  
  30  require_once (__DIR__ . '/../immediatefeedback/behaviour.php');
  31  
  32  
  33  /**
  34   * Question behaviour for immediate feedback with CBM.
  35   *
  36   * Each question has a submit button next to it along with some radio buttons
  37   * to input a certainty, that is, how sure they are that they are right.
  38   * The student can submit their answer at any time for immediate feedback.
  39   * Once the qustion is submitted, it is not possible for the student to change
  40   * their answer any more. The student's degree of certainty affects their score.
  41   *
  42   * @copyright  2009 The Open University
  43   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  44   */
  45  class qbehaviour_immediatecbm extends qbehaviour_immediatefeedback {
  46      public function get_min_fraction() {
  47          return question_cbm::adjust_fraction(parent::get_min_fraction(), question_cbm::HIGH);
  48      }
  49  
  50      public function get_max_fraction() {
  51          return question_cbm::adjust_fraction(parent::get_max_fraction(), question_cbm::HIGH);
  52      }
  53  
  54      public function get_expected_data() {
  55          if ($this->qa->get_state()->is_active()) {
  56              return array(
  57                  'submit' => PARAM_BOOL,
  58                  'certainty' => PARAM_INT,
  59              );
  60          }
  61          return parent::get_expected_data();
  62      }
  63  
  64      public function get_right_answer_summary() {
  65          $summary = parent::get_right_answer_summary();
  66          return question_cbm::summary_with_certainty($summary, question_cbm::HIGH);
  67      }
  68  
  69      public function get_correct_response() {
  70          if ($this->qa->get_state()->is_active()) {
  71              return array('certainty' => question_cbm::HIGH);
  72          }
  73          return array();
  74      }
  75  
  76      protected function get_our_resume_data() {
  77          $lastcertainty = $this->qa->get_last_behaviour_var('certainty');
  78          if ($lastcertainty) {
  79              return array('-certainty' => $lastcertainty);
  80          } else {
  81              return array();
  82          }
  83      }
  84  
  85      protected function is_same_response(question_attempt_step $pendingstep) {
  86          return parent::is_same_response($pendingstep) &&
  87                  $this->qa->get_last_behaviour_var('certainty') ==
  88                          $pendingstep->get_behaviour_var('certainty');
  89      }
  90  
  91      protected function is_complete_response(question_attempt_step $pendingstep) {
  92          return parent::is_complete_response($pendingstep) &&
  93                  $pendingstep->has_behaviour_var('certainty');
  94      }
  95  
  96      public function process_submit(question_attempt_pending_step $pendingstep) {
  97          if ($this->qa->get_state()->is_finished()) {
  98              return question_attempt::DISCARD;
  99          }
 100  
 101          if (!$this->question->is_gradable_response($pendingstep->get_qt_data()) ||
 102                  !$pendingstep->has_behaviour_var('certainty')) {
 103              $pendingstep->set_state(question_state::$invalid);
 104              return question_attempt::KEEP;
 105          }
 106  
 107          return $this->do_grading($pendingstep, $pendingstep);
 108      }
 109  
 110      public function process_finish(question_attempt_pending_step $pendingstep) {
 111          if ($this->qa->get_state()->is_finished()) {
 112              return question_attempt::DISCARD;
 113          }
 114  
 115          $laststep = $this->qa->get_last_step();
 116          return $this->do_grading($laststep, $pendingstep);
 117      }
 118  
 119      protected function do_grading(question_attempt_step $responsesstep,
 120              question_attempt_pending_step $pendingstep) {
 121          if (!$this->question->is_gradable_response($responsesstep->get_qt_data())) {
 122              $pendingstep->set_state(question_state::$gaveup);
 123  
 124          } else {
 125              $response = $responsesstep->get_qt_data();
 126              list($fraction, $state) = $this->question->grade_response($response);
 127  
 128              if ($responsesstep->has_behaviour_var('certainty')) {
 129                  $certainty = $responsesstep->get_behaviour_var('certainty');
 130              } else {
 131                  $certainty = question_cbm::default_certainty();
 132                  $pendingstep->set_behaviour_var('_assumedcertainty', $certainty);
 133              }
 134  
 135              $pendingstep->set_behaviour_var('_rawfraction', $fraction);
 136              $pendingstep->set_fraction(question_cbm::adjust_fraction($fraction, $certainty));
 137              $pendingstep->set_state($state);
 138              $pendingstep->set_new_response_summary(question_cbm::summary_with_certainty(
 139                      $this->question->summarise_response($response),
 140                      $responsesstep->get_behaviour_var('certainty')));
 141          }
 142          return question_attempt::KEEP;
 143      }
 144  
 145      public function summarise_action(question_attempt_step $step) {
 146          $summary = parent::summarise_action($step);
 147          if ($step->has_behaviour_var('certainty')) {
 148              $summary = question_cbm::summary_with_certainty($summary,
 149                      $step->get_behaviour_var('certainty'));
 150          }
 151          return $summary;
 152      }
 153  }