if (height == 0) height = NOTE_HEIGHT;
r = new Rectangle(x, y, NOTE_WIDTH, height);
while(isOccupied(r)) r.translate(NOTE_WIDTH, 0);
if (height == 0) height = NOTE_HEIGHT;
r = new Rectangle(x, y, NOTE_WIDTH, height);
while(isOccupied(r)) r.translate(NOTE_WIDTH, 0);