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questiontype.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 type class for the drawing question type.
*
* @package qtype
* @subpackage drawing
* @copyright ETHZ LET <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir . '/questionlib.php');
require_once($CFG->dirroot . '/question/engine/lib.php');
require_once($CFG->dirroot . '/question/type/drawing/question.php');
require_once(dirname(__FILE__) . '/renderer.php');
/**
* The drawing question type.
*
* @copyright ETHZ LET <[email protected]>
* @license http://opensource.org/licenses/BSD-3-Clause
*/
class qtype_drawing extends question_type {
public function extra_question_fields() {
return array('qtype_drawing', 'drawingmode', 'backgrounduploaded',
'backgroundwidth', 'backgroundheight', 'preservear', 'drawingoptions', 'alloweraser');
}
public function questionid_column_name() {
return 'questionid';
}
public function move_files($questionid, $oldcontextid, $newcontextid) {
parent::move_files($questionid, $oldcontextid, $newcontextid);
$fs = get_file_storage();
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid, 'qtype_drawing', 'qtype_drawing_image_file', $questionid);
}
protected function delete_files($questionid, $contextid) {
parent::delete_files($questionid, $contextid);
$this->delete_files_in_answers($questionid, $contextid, true);
$this->delete_files_in_hints($questionid, $contextid);
}
/**
* Custom method for deleting drawing questions.
*
* (non-PHPdoc)
*
* @see question_type::delete_question()
*/
public function delete_question($questionid, $contextid) {
global $DB;
$originalrecord = $DB->get_record('qtype_drawing', array('questionid' => $questionid));
$DB->delete_records('qtype_drawing', array('questionid' => $questionid));
$DB->delete_records('qtype_drawing_annotations', array('questionid' => $originalrecord->id));
parent::delete_question($questionid, $contextid);
}
public function save_question_options($question) {
global $DB, $USER;
$context = $question->context;
$drawingconfig = get_config('qtype_drawing');
$result = new stdClass();
// Insert all the new options.
$options = $DB->get_record('qtype_drawing',
array('questionid' => $question->id
));
if (!$question->drawingmode) {
$question->drawingmode = 1;
}
if (!$options) {
$options = new stdClass();
$options->questionid = $question->id;
$options->drawingmode = 1;
$options->allowstudentimage = 0;
$options->backgrounduploaded = 0;
$options->backgroundwidth = $drawingconfig->defaultcanvaswidth;
$options->backgroundheight = $drawingconfig->defaultcanvasheight;
$options->preservear = 1;
$options->drawingoptions = '';
$options->alloweraser = 0;
$options->id = $DB->insert_record('qtype_drawing', $options);
}
$options->drawingmode = $question->drawingmode;
if (isset($question->allowstudentimage)) {
$options->allowstudentimage = $question->allowstudentimage;
}
$options->backgrounduploaded = $question->backgrounduploaded;
$options->backgroundwidth = $question->backgroundwidth;
$options->backgroundheight = $question->backgroundheight;
if (!isset($question->preservear)) {
$question->preservear = 0;
}
$options->preservear = $question->preservear;
if(!isset($question->alloweraser)){
$question->alloweraser = 0;
}
$options->alloweraser = $question->alloweraser;
$DB->update_record('qtype_drawing', $options);
$this->save_hints($question);
// Save the background image.
if (isset($question->qtype_drawing_image_file)) {
$fs = get_file_storage();
$usercontext = context_user::instance($USER->id);
$draftfiles = $fs->get_area_files($usercontext->id, 'user', 'draft', $question->qtype_drawing_image_file, 'id');
if (count($draftfiles) >= 2) {
$fs->delete_area_files($question->context->id, 'qtype_drawing', 'qtype_drawing_image_file', $question->id);
file_save_draft_area_files($question->qtype_drawing_image_file,
$question->context->id, 'qtype_drawing', 'qtype_drawing_image_file',
$question->id, array('subdirs' => 0, 'maxbytes' => 0, 'maxfiles' => 1));
} else {
// No files have been indicated to be uploaded.
// Check if this is an attempt to make a duplicate copy of this question.
// And that this is not a simple EDIT, in which case we don't have to do anything to the background image file.
if (property_exists($question, 'pre_existing_question_id') &&
$question->pre_existing_question_id != 0 && $question->pre_existing_question_id != $question->id) {
// This was an edit form which turned out to be a "Make copy".
// We need to copy over the background image of the old question into a new record.
// First fetch the old one.
$oldfiles = $fs->get_area_files($question->context->id,
'qtype_drawing', 'qtype_drawing_image_file', $question->pre_existing_question_id, 'id');
if (count($oldfiles) >= 2) {
// Files indeed exist.
foreach ($oldfiles as $oldfile) {
if ($oldfile->is_directory()) {
continue;
}
$newfile = array(
'contextid' => $question->context->id,
'component' => 'qtype_drawing',
'filearea' => 'qtype_drawing_image_file',
'itemid' => $question->id,
'filepath' => '/',
'filename' => $oldfile->get_filename());
$fs->create_file_from_storedfile($newfile, $oldfile);
continue;
}
}
} else {
// Background image has been delibrately removed by teacher.
// Question updated but background was not touched?. If not, delete the bg.
if (!isset($question->pre_existing_question_id) || $question->pre_existing_question_id == 0) {
$fs = get_file_storage();
$fs->delete_area_files($question->context->id, 'qtype_drawing', 'qtype_drawing_image_file', $question->id);
}
}
}
}
}
protected function initialise_question_instance(question_definition $question, $questiondata) {
parent::initialise_question_instance($question, $questiondata);
$this->initialise_question_answers($question, $questiondata);
}
public function get_random_guess_score($questiondata) {
return 0;
}
public function get_possible_responses($questiondata) {
$responses = array();
$starfound = false;
foreach ($questiondata->options->answers as $aid => $answer) {
$responses[$aid] = new question_possible_response($answer->answer, $answer->fraction);
if ($answer->answer === '*') {
$starfound = true;
}
}
if (!$starfound) {
$responses[0] = new question_possible_response(
get_string('didnotmatchanyanswer', 'question'), 0);
}
$responses[null] = question_possible_response::no_response();
return array($questiondata->id => $responses);
}
public function export_to_xml($question, qformat_xml $format, $extra=null) {
$extraquestionfields = $this->extra_question_fields();
if (!is_array($extraquestionfields)) {
return false;
}
// Omit table name (question).
array_shift($extraquestionfields);
$expout = '';
foreach ($extraquestionfields as $field) {
$exportedvalue = $question->options->$field;
if (!empty($exportedvalue) && htmlspecialchars($exportedvalue) != $exportedvalue) {
$exportedvalue = "<![CDATA[" . $exportedvalue . "]]>";
}
$expout .= " <$field>{$exportedvalue}</$field>\n";
}
$expout .= " <bgimage>\n";
$bgimagearray = qtype_drawing_renderer::get_image_for_question($question);
if($bgimagearray === null || !isset($bgimagearray)){
$bgimagearray = array(null, null, null);
}
$expout .= " <filename>" . $bgimagearray[2] . "</filename>\n";
$expout .= " <dataURL><![CDATA[" . $bgimagearray[1] . "]]></dataURL>\n";
$expout .= " <imagetype>" . $bgimagearray[0] . "</imagetype>\n";
$expout .= " </bgimage>\n";
foreach ($question->options->answers as $answer) {
$percent = 100 * $answer->fraction;
$expout .= " <answer fraction=\"$percent\">\n";
$expout .= $format->writetext($answer->answer, 3, false);
$expout .= " <feedback format=\"html\">\n";
$expout .= $format->writetext($answer->feedback, 4, false);
$expout .= " </feedback>\n";
$expout .= " </answer>\n";
}
return $expout;
}
public function import_from_xml($data, $question, qformat_xml $format, $extra=null) {
if (!isset($data['@']['type']) || $data['@']['type'] != 'drawing') {
return false;
}
$question = $format->import_headers($data);
$question->qtype = 'drawing';
$question->shuffleanswers = array_key_exists('shuffleanswers', $format->getpath($data, array('#'), array()));
$format->import_combined_feedback($question, $data, true);
$format->import_hints($question, $data, true, false, $format->get_format($question->questiontextformat));
// Save Extra Fields.
$extraquestionfields = $this->extra_question_fields();
if (!is_array($extraquestionfields)) {
return false;
}
// Remove table name from array of extra fields (question name).
array_shift($extraquestionfields);
$question->options = new stdClass();
foreach ($extraquestionfields as $field) {
$question->$field = $format->getpath($data, array('#', $field, '0', '#'), 'does_not_exist');
if ($question->$field === 'does_not_exist') {
return false;
}
}
// Save canvas background image file.
$bgimagearray[0] = $format->getpath($data, array('#', 'bgimage', '0', '#', 'imagetype', '0', '#'), 'does_not_exist');
$bgimagearray[1] = $format->getpath($data, array('#', 'bgimage', '0', '#', 'dataURL', '0', '#'), 'does_not_exist');
$bgimagearray[2] = $format->getpath($data, array('#', 'bgimage', '0', '#', 'filename', '0', '#'), 'does_not_exist');
if ($bgimagearray[1] === 'does_not_exist' || $bgimagearray[2] === 'does_not_exist') {
return false;
}
if (trim($bgimagearray[1]) != '') {
if ($bgimagearray[0] != 'svg') {
// Convert dataURL to binary.
$imgbinarydata = base64_decode(qtype_drawing_renderer::strstr_after($bgimagearray[1], 'base64,'));
// Make sure this is a valid image file we could read.
if (($gdimg = imagecreatefromstring($imgbinarydata)) === false) {
return false;
}
// Clean up GD resource.
imagedestroy($gdimg);
} else {
$imgbinarydata = $bgimagearray[1];
}
// Prepare draft file area which would later be really saved in.
// ::save_question_options() when the question object already exists.
global $USER;
$fs = get_file_storage();
$usercontext = context_user::instance($USER->id);
$question->qtype_drawing_image_file = file_get_unused_draft_itemid();
$record = new stdClass();
$record->contextid = $usercontext->id;
$record->component = 'user';
$record->filearea = 'draft';
$record->itemid = $question->qtype_drawing_image_file;
$record->filename = $bgimagearray[2];
$record->filepath = '/';
$fs->create_file_from_string($record, $imgbinarydata);
}
return $question;
}
}