function create_response_pdf($userid, $submissionid)
{
global $CFG;
$filearea = $CFG->dataroot . '/' . $this->file_area_name($userid);
$sourcearea = $filearea . '/submission';
$sourcefile = $sourcearea . '/submission.pdf';
if (!is_dir($sourcearea) || !file_exists($sourcefile)) {
error('Submitted PDF not found');
return false;
}
$destarea = $filearea . '/responses';
$destfile = $destarea . '/response.pdf';
check_dir_exists($destarea, true, true);
$mypdf = new MyPDFLib();
$mypdf->load_pdf($sourcefile);
$comments = get_records('assignment_uploadpdf_comment', 'assignment_submission', $submissionid, 'pageno');
$annotations = get_records('assignment_uploadpdf_annot', 'assignment_submission', $submissionid, 'pageno');
if ($comments) {
$comment = current($comments);
} else {
$comment = false;
}
if ($annotations) {
$annotation = current($annotations);
} else {
$annotation = false;
}
while (true) {
if ($comment) {
$nextpage = $comment->pageno;
if ($annotation) {
if ($annotation->pageno < $nextpage) {
$nextpage = $annotation->pageno;
}
}
} else {
if ($annotation) {
$nextpage = $annotation->pageno;
} else {
break;
}
}
while ($nextpage > $mypdf->current_page()) {
if (!$mypdf->copy_page()) {
error('Ran out of pages - this should not happen! - comment.pageno = ' . $comment->pageno . '; currrentpage = ' . $mypdf->CurrentPage());
return false;
}
}
while ($comment && $comment->pageno == $mypdf->current_page()) {
$mypdf->add_comment($comment->rawtext, $comment->posx, $comment->posy, $comment->width, $comment->colour);
$comment = next($comments);
}
while ($annotation && $annotation->pageno == $mypdf->current_page()) {
if ($annotation->type == 'freehand') {
$path = explode(',', $annotation->path);
$mypdf->add_annotation(0, 0, 0, 0, $annotation->colour, 'freehand', $path);
} else {
$mypdf->add_annotation($annotation->startx, $annotation->starty, $annotation->endx, $annotation->endy, $annotation->colour, $annotation->type);
}
$annotation = next($annotations);
}
}
$mypdf->copy_remaining_pages();
$mypdf->save_pdf($destfile);
return true;
}
