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behaviour.php
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behaviour.php
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<?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/>.
/**
* Question behaviour where the student can submit questions one at a
* time for immediate feedback, with certainty based marking.
*
* @package qbehaviour
* @subpackage immediatecbm
* @copyright 2009 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once(dirname(__FILE__) . '/../immediatefeedback/behaviour.php');
/**
* Question behaviour for immediate feedback with CBM.
*
* Each question has a submit button next to it along with some radio buttons
* to input a certainly, that is, how sure they are that they are right.
* The student can submit their answer at any time for immediate feedback.
* Once the qustion is submitted, it is not possible for the student to change
* their answer any more. The student's degree of certainly affects their score.
*
* @copyright 2009 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qbehaviour_immediatecbm extends qbehaviour_immediatefeedback {
const IS_ARCHETYPAL = true;
public function get_min_fraction() {
return question_cbm::adjust_fraction(parent::get_min_fraction(), question_cbm::HIGH);
}
public function get_expected_data() {
if ($this->qa->get_state()->is_active()) {
return array(
'submit' => PARAM_BOOL,
'certainty' => PARAM_INT,
);
}
return parent::get_expected_data();
}
public function get_right_answer_summary() {
$summary = parent::get_right_answer_summary();
return question_cbm::summary_with_certainty($summary, question_cbm::HIGH);
}
public function get_correct_response() {
if ($this->qa->get_state()->is_active()) {
return array('certainty' => question_cbm::HIGH);
}
return array();
}
protected function get_our_resume_data() {
$lastcertainty = $this->qa->get_last_behaviour_var('certainty');
if ($lastcertainty) {
return array('-certainty' => $lastcertainty);
} else {
return array();
}
}
protected function is_same_response($pendingstep) {
return parent::is_same_response($pendingstep) &&
$this->qa->get_last_behaviour_var('certainty') ==
$pendingstep->get_behaviour_var('certainty');
}
protected function is_complete_response($pendingstep) {
return parent::is_complete_response($pendingstep) &&
$pendingstep->has_behaviour_var('certainty');
}
public function process_submit(question_attempt_pending_step $pendingstep) {
if ($this->qa->get_state()->is_finished()) {
return question_attempt::DISCARD;
}
if (!$this->qa->get_question()->is_gradable_response($pendingstep->get_qt_data()) ||
!$pendingstep->has_behaviour_var('certainty')) {
$pendingstep->set_state(question_state::$invalid);
return question_attempt::KEEP;
}
return $this->do_grading($pendingstep, $pendingstep);
}
public function process_finish(question_attempt_pending_step $pendingstep) {
if ($this->qa->get_state()->is_finished()) {
return question_attempt::DISCARD;
}
$laststep = $this->qa->get_last_step();
return $this->do_grading($laststep, $pendingstep);
}
protected function do_grading(question_attempt_step $responsesstep,
question_attempt_pending_step $pendingstep) {
if (!$this->question->is_gradable_response($responsesstep->get_qt_data())) {
$pendingstep->set_state(question_state::$gaveup);
} else {
$response = $responsesstep->get_qt_data();
list($fraction, $state) = $this->question->grade_response($response);
if ($responsesstep->has_behaviour_var('certainty')) {
$certainty = $responsesstep->get_behaviour_var('certainty');
} else {
$certainty = question_cbm::default_certainty();
$pendingstep->set_behaviour_var('_assumedcertainty', $certainty);
}
$pendingstep->set_behaviour_var('_rawfraction', $fraction);
$pendingstep->set_fraction(question_cbm::adjust_fraction($fraction, $certainty));
$pendingstep->set_state($state);
$pendingstep->set_new_response_summary(question_cbm::summary_with_certainty(
$this->question->summarise_response($response),
$responsesstep->get_behaviour_var('certainty')));
}
return question_attempt::KEEP;
}
public function summarise_action(question_attempt_step $step) {
$summary = parent::summarise_action($step);
if ($step->has_behaviour_var('certainty')) {
$summary = question_cbm::summary_with_certainty($summary,
$step->get_behaviour_var('certainty'));
}
return $summary;
}
public static function adjust_random_guess_score($fraction) {
return question_cbm::adjust_fraction($fraction, question_cbm::default_certainty());
}
}