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array within an arrayList? - comparing objects - in way over my head!

[2 Replies]
- 15-Jan-2013 01:16 PM
- Forum: Programming Questions
Hello, thanks for reading my question!

I am trying to make a patch that interprets the MIDI data I send it into class objects that are then represented visually.

Per MIDI note played, two messages are sent - a note-on and a note-off (both containing channel, pitch and velocity data). I am trying to add a note object to an ArrayList when a note-on message is received and then subsequently, to remove that same object when this note's corresponding note-off message is received. Here is my problem...

Adding note objects to an ArrayList when a note-on message is received doesn't seem to be the problem, the problem is removing the corresponding object. I think I need to compare the note-off message received with the note objects contained in the array list, removing the note object that corresponds - but doing this has proved to be well beyond my programming abilities.

Below is what I have so far, I'd be very grateful for any help you could provide.

Thank you,

Adam
1. import fullscreen.*;
2. import themidibus.*; //Import the library
5. MidiBus busA; //The first MidiBus
6. import javax.sound.midi.MidiMessage; //Import the MidiMessage classes http://java.sun.com/j2se/1.5.0/docs/api/javax/sound/midi/MidiMessage.html
7. import javax.sound.midi.SysexMessage;
8. import javax.sound.midi.ShortMessage;
10. PVector v1;
11. FullScreen fs;
14. void setup() {
16. size(400,400,P3D);
17. background(0);
19. MidiBus.list(); //List all available Midi devices. This will show each device's index and name.
20. busA = new MidiBus(this, 0, 0);
21. busA.addInput("IAC Bus 1");
23. v1 = new PVector (width/2,height/2,0);
25. // Create the fullscreen object
26. fs = new FullScreen(this);
28. // enter fullscreen mode
29. fs.enter();
31. }
34. void draw() {
35. //lights();
36. //fill(0,10);
37. //noStroke();
38. //rect(0,0,width/2,height/2);
40. }
43. void noteOn(int channel, int pitch, int velocity){
45. //println(channel +" "+ pitch +" "+ velocity);
46. Note.addANote(channel, pitch, velocity);
48. }
51. void noteOff(int channel, int pitch, int velocity){
53. //println(channel +" "+ pitch +" "+ velocity);
54. Note.removeANote(channel, pitch, velocity);
56. }
59. class Note {
61. ArrayList notes = new ArrayList();
65. Note(int channel, int pitch, int velocity){
67. int[] data = {channel, pitch, velocity};
70. }
73. void addANote (int channel, int pitch, int velocity){
75. notes.add(new Note(channel,pitch,velocity));
77. }
80. void removeANote (int channel, int pitch, int velocity){
82. int _channel = this.channel;
83. int _pitch = this.pitch;
84. int _velocity = this.velocity;
86. int[] _data = {_channel, _pitch, _velocity};
88. for (int i = 0; i < notes.size(); i++){
90. if(notes.get[i] == _data){
91. notes.remove(i);
92. }
94. }
95. }
98. void display (){
100. for(int i = 0; i < notes.size(); i++){
102. }
105. }
106. }

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