/** Return the duration of this staff system. This is the start time
* difference between the first and last measure start time slices in the
* first staff plus the duration of the last measure. (It is assumed that all
* staves in the staff system have the same duration.)
* This is used to compute the screen hotspots of the measure starts.
*/
public Rational getDuration()
{
if (_duration != null)
{
return(_duration);
}
if (getStaffCount() == 0 || getStaff(0).getMeasureStartCount() == 0)
{
// There are no staffs or time slices! This is unexpected. Just return 0.
// DEBUG: maybe this should be handled more gracefully.
_duration = new Rational(0, 1);
return(_duration);
}
Staff staff = getStaff(0);
MeasureStartTimeSlice lastMeasureStart =
staff.getMeasureStart(staff.getMeasureStartCount() - 1);
IntRatio result = new IntRatio(lastMeasureStart.getStartTime());
result.sub(getStartTime());
result.add(lastMeasureStart.getDuration());
_duration = new Rational(result);
return(_duration);
}
public int getSymbolCount()
{
if (_symbolPositioner != null)
{
return(_symbolPositioner.getSymbolCount());
}
// Create a new SymbolPositioner and add a position at each quarter note.
_symbolPositioner = new SymbolPositioner();
Rational quarter = new Rational(1, 4);
for (IntRatio r = new IntRatio(0, 1);
r.compareTo(getDuration()) < 0;
r.add(quarter))
{
_symbolPositioner.add(new Rational(r), 0);
}
// Go through the entire staff system and for every measure which
// has the same start time and duration as this, set its
// SymbolPositioner to the new one and call its addToSymbolPositioner
StaffSystem system = getParentStaff().getParentSystem();
for (int staffIndex = 0; staffIndex < system.getStaffCount(); ++staffIndex)
{
Staff staff = system.getStaff(staffIndex);
for (int measureIndex = 0;
measureIndex < staff.getMeasureStartCount();
++measureIndex)
{
MeasureStartTimeSlice measure = staff.getMeasureStart(measureIndex);
if (measure.getStartTime().Equals(getStartTime()) &&
measure.getDuration().Equals(getDuration()))
{
// This is an equivalent measure to this one in another
// staff (or it is this same measure.
measure._symbolPositioner = _symbolPositioner;
measure.addToSymbolPositioner();
// There should not be any more measures in this staff
// with the same start time.
break;
}
}
}
return(_symbolPositioner.getSymbolCount());
}
