private function getStroke(Beat $beat, Beat $previous = null, array $stroke)
{
$direction = $beat->getStroke()->getDirection();
if ($previous === null || !($direction == Stroke::STROKE_NONE && $previous->getStroke()->getDirection() == Stroke::STROKE_NONE)) {
if ($direction == Stroke::STROKE_NONE) {
for ($i = 0; $i < count($stroke); $i++) {
$stroke[$i] = 0;
}
} else {
$stringUseds = 0;
$stringCount = 0;
for ($vIndex = 0; $vIndex < $beat->countVoices(); $vIndex++) {
$voice = $beat->getVoice($vIndex);
for ($nIndex = 0; $nIndex < $voice->countNotes(); $nIndex++) {
$note = $voice->getNote($nIndex);
if (!$note->isTiedNote()) {
$stringUseds |= 0x1 << $note->getString() - 1;
$stringCount++;
}
}
}
if ($stringCount > 0) {
$strokeMove = 0;
$strokeIncrement = $beat->getStroke()->getIncrementTime($beat);
for ($i = 0; $i < count($stroke); $i++) {
$index = $direction == Stroke::STROKE_DOWN ? count($stroke) - 1 - $i : $i;
if (($stringUseds & 0x1 << $index) != 0) {
$stroke[$index] = $strokeMove;
$strokeMove += $strokeIncrement;
}
}
}
}
}
return $stroke;
}
private function writeMeasure(Measure $measure, $changeTempo)
{
for ($v = 0; $v < 2; $v++) {
$voices = array();
for ($m = 0; $m < $measure->countBeats(); $m++) {
$beat = $measure->getBeat($m);
if ($v < $beat->countVoices()) {
$voice = $beat->getVoice($v);
if (!$voice->isEmpty()) {
$voices[] = $voice;
}
}
}
if (count($voices) > 0) {
$this->writeInt(count($voices));
for ($i = 0; $i < count($voices); $i++) {
$voice = $voices[$i];
$this->writeBeat($voice, $voice->getBeat(), $measure, $changeTempo && $i == 0);
}
} else {
$count = $measure->getTimeSignature()->getNumerator();
$beat = new Beat();
if ($v < $beat->countVoices()) {
$voice = $beat->getVoice($v);
$voice->getDuration()->setValue($measure->getTimeSignature()->getDenominator()->getValue());
$voice->setEmpty(true);
$this->writeInt($count);
for ($i = 0; $i < $count; $i++) {
$this->writeBeat($voice, $voice->getBeat(), $measure, $changeTempo && $i == 0);
}
}
}
}
}
