/** Creates new Rational with the given numerator and denominator.
* If denominator is zero (which doesn't make sense), this sets
* numerator to zero and denominator to 1.
*/
public Rational(int numerator, int denominator)
{
if (denominator == 0) {
numerator = 0;
denominator = 1;
}
_ratio = new IntRatio(numerator, denominator);
}
/** Set this ratio to this - r
*/
public void sub(IntRatio r)
{
n = n * r.d - r.n * d;
d = d * r.d;
// simplify now to avoid overflow problems
_simplified = false;
simplify();
// Must recalculate the double value.
_gotDoubleValue = false;
}
/** Return the duration of this measure. If this MeasureStartTimeSlice has
* a following MeasureStartTimeSlice in the Staff, the duration is the start time
* difference of this measure start and the following measure start.
* If no following measure start, the duration of this measure is
* the start time of the last event TimeSlice. Note that this assumes
* the last event TimeSlice has zero duration, but this is reasonable
* since the last event TimeSlice usually just holds a bar line.
*/
public Rational getDuration()
{
if (_duration != null)
return _duration;
if ((getIndex() + 1) >= getParentStaff().getMeasureStartCount()) {
// This is the last measure start
if (getTimeSliceCount() == 0)
// No time slices, just set duration to zero
_duration = new Rational(0, 1);
else
// DEBUG: This assumes the event time slices are ordered. Maybe check this.
_duration = getTimeSlice(getTimeSliceCount() - 1).getStartTime();
} else {
// Compute the start time difference between the next measure and this
// DEBUG: This assumes that the measure start time slices are ordered. Maybe check this.
IntRatio result = new IntRatio
(getParentStaff().getMeasureStart(getIndex() + 1).getStartTime());
result.sub(getStartTime());
_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();
}
/** Set this ratio to this + r
*/
public void add(IntRatio r)
{
n = n * r.d + r.n * d;
d = d * r.d;
// simplify now to avoid overflow problems
_simplified = false;
simplify();
// Must recalculate the double value.
_gotDoubleValue = false;
}
/** Creates new IntRatio from the given IntRatio.
*/
public IntRatio(IntRatio r)
{
n = r.n;
d = r.d;
// No need to simplify until necessary.
}
/** Set the value of this IntRatio to the given IntRatio.
*/
public void set(IntRatio r)
{
n = r.n;
d = r.d;
// Must recalculate the double value.
_gotDoubleValue = false;
// No need to simplify until necessary.
_simplified = false;
}
/** Creates new Rational with the numerator and denominator
* from the given IntRatio.
*/
public Rational(IntRatio r)
{
_ratio = new IntRatio(r);
}
/** 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;
}
