question/type/numerical/renderer.php

   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 /**
  19  * Numerical question renderer class.
  20  *
  21  * @package qtype_numerical
  22  * @copyright 2009 The Open University
  23  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26
  27 /**
  28  * Generates the output for short answer questions.
  29  *
  30  * @copyright 2009 The Open University
  31  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  32  */
  33 class qtype_numerical_renderer extends qtype_renderer {
  34     public function formulation_and_controls(question_attempt $qa,
  35             question_display_options $options) {
  36
  37         $question = $qa->get_question();
  38         $currentanswer = $qa->get_last_qt_var('answer');
  39         if ($question->has_separate_unit_field()) {
  40             $selectedunit = $qa->get_last_qt_var('unit');
  41         } else {
  42             $selectedunit = null;
  43         }
  44
  45         $inputname = $qa->get_qt_field_name('answer');
  46         $inputattributes = array(
  47             'type' => 'text',
  48             'name' => $inputname,
  49             'value' => $currentanswer,
  50             'id' => $inputname,
  51             'size' => 80,
  52         );
  53
  54         if ($options->readonly) {
  55             $inputattributes['readonly'] = 'readonly';
  56         }
  57
  58         $feedbackimg = '';
  59         if ($options->correctness) {
  60             list($value, $unit) = $question->ap->apply_units($currentanswer, $selectedunit);
  61             $answer = $question->get_matching_answer($value);
  62             if ($answer) {
  63                 $fraction = $question->apply_unit_penalty($answer->fraction, $unit);
  64             } else {
  65                 $fraction = 0;
  66             }
  67             $inputattributes['class'] = $this->feedback_class($fraction);
  68             $feedbackimg = $this->feedback_image($fraction);
  69         }
  70
  71         $questiontext = $question->format_questiontext($qa);
  72         $placeholder = false;
  73         if (preg_match('/_____+/', $questiontext, $matches)) {
  74             $placeholder = $matches[0];
  75             $inputattributes['size'] = round(strlen($placeholder) * 1.1);
  76         }
  77
  78         $input = html_writer::empty_tag('input', $inputattributes) . $feedbackimg;
  79
  80         if ($question->has_separate_unit_field()) {
  81             if ($question->unitdisplay == qtype_numerical::UNITRADIO) {
  82                 $choices = array();
  83                 $i = 1;
  84                 foreach ($question->ap->get_unit_options() as $unit) {
  85                     $id = $qa->get_qt_field_name('unit') . '_' . $i++;
  86                     $radioattrs = array('type' => 'radio', 'id' => $id, 'value' => $unit,
  87                             'name' => $qa->get_qt_field_name('unit'));
  88                     if ($unit == $selectedunit) {
  89                         $radioattrs['checked'] = 'checked';
  90                     }
  91                     $choices[] = html_writer::tag('label',
  92                             html_writer::empty_tag('input', $radioattrs) . $unit,
  93                             array('for' => $id, 'class' => 'unitchoice'));
  94                 }
  95
  96                 $unitchoice = html_writer::tag('span', implode(' ', $choices),
  97                         array('class' => 'unitchoices'));
  98
  99             } else if ($question->unitdisplay == qtype_numerical::UNITSELECT) {
 100                 $unitchoice = html_writer::select($question->ap->get_unit_options(),
 101                         $qa->get_qt_field_name('unit'), $selectedunit, array(''=>'choosedots'),
 102                         array('disabled' => $options->readonly));
 103             }
 104
 105             if ($question->ap->are_units_before()) {
 106                 $input = $unitchoice . ' ' . $input;
 107             } else {
 108                 $input = $input . ' ' . $unitchoice;
 109             }
 110         }
 111
 112         if ($placeholder) {
 113             $questiontext = substr_replace($questiontext, $input,
 114                     strpos($questiontext, $placeholder), strlen($placeholder));
 115         }
 116
 117         $result = html_writer::tag('div', $questiontext, array('class' => 'qtext'));
 118
 119         if (!$placeholder) {
 120             $result .= html_writer::start_tag('div', array('class' => 'ablock'));
 121             $result .= get_string('answer', 'qtype_shortanswer',
 122                     html_writer::tag('div', $input, array('class' => 'answer')));
 123             $result .= html_writer::end_tag('div');
 124         }
 125
 126         if ($qa->get_state() == question_state::$invalid) {
 127             $result .= html_writer::nonempty_tag('div',
 128                     $question->get_validation_error(array('answer' => $currentanswer)),
 129                     array('class' => 'validationerror'));
 130         }
 131
 132         return $result;
 133     }
 134
 135     public function specific_feedback(question_attempt $qa) {
 136         $question = $qa->get_question();
 137
 138         if ($question->has_separate_unit_field()) {
 139             $selectedunit = $qa->get_last_qt_var('unit');
 140         } else {
 141             $selectedunit = null;
 142         }
 143         list($value, $unit) = $question->ap->apply_units(
 144                 $qa->get_last_qt_var('answer'), $selectedunit);
 145         $answer = $question->get_matching_answer($value);
 146
 147         if ($answer && $answer->feedback) {
 148             $feedback = $question->format_text($answer->feedback, $answer->feedbackformat,
 149                     $qa, 'question', 'answerfeedback', $answer->id);
 150         } else {
 151             $feedback = '';
 152         }
 153
 154         if ($question->unitgradingtype && !$question->ap->is_known_unit($unit)) {
 155             $feedback .= html_writer::tag('p', get_string('unitincorrect', 'qtype_numerical'));
 156         }
 157
 158         return $feedback;
 159     }
 160
 161     public function correct_response(question_attempt $qa) {
 162         $question = $qa->get_question();
 163         $answer = $question->get_correct_answer();
 164         if (!$answer) {
 165             return '';
 166         }
 167
 168         $response = str_replace('.', $question->ap->get_point(), $answer->answer);
 169         if ($question->unitdisplay != qtype_numerical::UNITNONE) {
 170             $response = $question->ap->add_unit($response);
 171         }
 172
 173         return get_string('correctansweris', 'qtype_shortanswer', $response);
 174     }
 175 }