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NoteManager.pde
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NoteManager.pde
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// NoteManager class manages the tracking of MIDI notes, as played live
class NoteManager {
public HashSet<Note> notes = new HashSet<Note>(); // all note objects currently being tracked
private HashSet<Note> notesToAdd = new HashSet<Note>(); // notes to add to the list of tracked notes
private HashSet<Note> release = new HashSet<Note>(); // notes that will be released on this iteration of the draw() loop
private HashSet<Note> notesToRelease = new HashSet<Note>(); // notes waiting for the next iteration of draw() to be released
// construct a new NoteManager object
public NoteManager() {
}
// add a new note to tracked notes
void addNote(Note n) {
// add note to list of notes that will be tracked in the next iteration of draw()
notesToAdd.add(n);
}
// remove a note from tracked notes
void releaseNote(Note n) {
// add note to list of notes that will be released in the next iteration of draw()
notesToRelease.add(n);
}
// add new notes to tracked notens, remove old notes from tracked notes
void track() {
this.release.addAll(this.notesToRelease); // add every note waiting to be released to list of notes about to be released
this.notesToRelease.clear(); // remove everything from list of notes waiting to be released
// for each note that needs to be released
for (Note n : this.release) {
// find its counterpart in the tracked notes array
for (Note m : this.notes) {
if (n.channel == m.channel && n.pitch == m.pitch) {
m.isReleased = true; // record that this note is now released
}
}
}
this.release.clear(); // remove everything from the list of notes to remove
this.notes.addAll(this.notesToAdd); // add every note waiting to be kept track of
this.notesToAdd.clear(); // remove everything from list of notes waiting to be tracked
// iterate through all notes currently being tracked
Iterator<Note> iter = this.notes.iterator();
while (iter.hasNext()) {
Note n = iter.next();
// if note has been released, decrement lifespan
if (n.isReleased) {
n.lifespan--;
}
// update and display each note
n.update();
n.display();
// if a note is finished, remove from tracked notes
if (n.lifespan <= 0) {
iter.remove();
}
}
}
}