protected function add_interaction(ImsQtiWriter $body, $question)
{
$question_count = 0;
foreach ($question->options->subquestions as $subquestion) {
if (!empty($subquestion->questiontext)) {
$question_count++;
}
}
$result = $body->add_matchInteraction(ImsQtiWriter::RESPONSE, $question_count, $question->options->shuffleanswers);
$questions = $result->add_simpleMatchSet();
$answers = $result->add_simpleMatchSet();
$question_score = $question->defaultgrade / $question_count;
$count = 0;
foreach ($question->options->subquestions as $subquestion) {
++$count;
$question_id = 'Q_' . $count;
$answer_id = 'A_' . $count;
if ($has_question = !empty($subquestion->questiontext)) {
$questions->add_simpleAssociableChoice($question_id, false, array(), 1)->add_flow($subquestion->questiontext);
}
if ($has_answer = !empty($subquestion->answertext)) {
$answers->add_simpleAssociableChoice($answer_id, false, array(), 1)->add_flow($subquestion->answertext);
}
if ($has_question && $has_answer) {
$key = "{$question_id} {$answer_id}";
$this->mapping->add_mapEntry($key, $question_score);
$this->correct_response->add_value($key);
}
}
return $result;
}
