public function __construct() {
parent::__construct();
$this->defaultmark = 0;
$this->penalty = 0;
$this->length = 0;
}
/**
* Generate the standard PRT feedback for a pearticular score.
* @param question_attempt $qa the question attempt to display.
* @param question_definition $question the question being displayed.
* @param stack_potentialresponse_tree_state $result the results to display.
* @return string nicely standard feedback, for display.
*/
protected function standard_prt_feedback($qa, $question, $result)
{
if ($result->errors) {
return '';
}
$state = question_state::graded_state_for_fraction($result->score);
$class = $state->get_feedback_class();
$field = 'prt' . $class . 'instantiated';
$format = 'prt' . $class . 'format';
if ($question->{$field}) {
return html_writer::tag('div', $question->format_text(stack_maths::process_display_castext($question->{$field}, $this), $question->{$format}, $qa, 'qtype_stack', $field, $question->id), array('class' => $class));
}
return '';
}