MIDIファイルからオルゴール用のレーザーカット用svg出力をするprocessingスケッチ

Musicbox.pde

import javax.sound.midi.*;
import processing.svg.PGraphicsSVG;

class Note {
  long tick;
  int noteNo;
}

ArrayList<Note> notes = new ArrayList<Note>();

void setup() {

  size(1280, 384);

  String path = dataPath("Musicbox.mid");
  File midiFile = new File(path);
  try {
    Sequence seq = MidiSystem.getSequence(midiFile);
    Track[] tracks = seq.getTracks();

    // how many tracks are there
    println("number of tracks: "+ tracks.length);

    // parse first track
    println("events of 1st track:");

    for (int trackNo = 0; trackNo<tracks.length; trackNo++) {
      Track myTrack = tracks[trackNo];
      for (int j =0; j< myTrack.size(); j++) {

        // get midi-message for every event
        if (myTrack.get(j).getMessage() instanceof ShortMessage) {

          ShortMessage m =  (ShortMessage) myTrack.get(j).getMessage();



          // log note-on or note-off events
          int cmd = m.getCommand();
          if (cmd == ShortMessage.NOTE_ON) {

            if (m.getData2()== 0)
            {
              continue;
            }
            MidiEvent mev = myTrack.get(j);
            long evTick = mev.getTick();
            print("ticks:" + evTick + "\n");

            print( (cmd==ShortMessage.NOTE_ON ? "NOTE_ON" : "NOTE_OFF") + "; ");
            print("channel: " + m.getChannel() + "; ");
            print("note: " + m.getData1() + "; ");
            println("velocity: " + m.getData2());  

            Note note = new Note();
            note.tick = evTick;
            note.noteNo = m.getData1();
            notes.add(note);
          } else if (cmd == ShortMessage.NOTE_OFF) {
          } else
          {
            println("Other message: " + cmd);
          }
        }
      }
    }
    println();

    NoteConvert();

    DrawMusic();
  }

  catch(Exception e) {
    e.printStackTrace();
    exit();
  }
}

// 60 C4
// 

void NoteConvert()
{
  for (Note note : notes)
  {
    int noteNo = note.noteNo;

    // upper E3 77
    if (noteNo > 77)
    {
      noteNo -=12;
      print("octave down:"+ (noteNo+12) + " to " + noteNo + "\n");
    }

    // uppper C5 72
    if (noteNo > 72)
    {
      if ( 
        noteNo == 74)
      {
        noteNo = 73;
        print("D5 to 73 :"+ noteNo + "\n");
      } else if (
        noteNo == 76) {
        noteNo = 74;
        print("E5 to 74:"+ noteNo + "\n");
      } else {
        noteNo -= 12; 
        print("octave down1:"+ noteNo + "\n");
      }
    }

    // lower C2 36
    if (noteNo < 36)
    {
      noteNo +=12;
      print("octave up:"+ (noteNo-12) + " to " + noteNo + "\n");
    }


    // D#3
    if (noteNo == 51)
    {
      noteNo +=12;
      print("D#3 octave up:"+ noteNo + "\n");
    }
    // D3 50 to 51
    else if (noteNo == 50)
    {
      noteNo = 51;
      print("D3 to 51:"+ noteNo + "\n");
    }
    // C#3 49
    else if (noteNo == 49)
    {
      noteNo +=12;
      print("C#3 octave up:"+ noteNo + "\n");
    }
    // C3 48 to 50
    else if (noteNo == 48)
    {
      noteNo = 50;
      print("C3 to 50:"+ noteNo + "\n");
    }
    // B2 47 to 49
    else if (noteNo == 47)
    {
      noteNo = 49;
      print("B2 to 49:"+ noteNo + "\n");
    }
    // A#2 46
    else if (noteNo == 46)
    {
      noteNo +=12;
      print("A#2 octave up:"+ noteNo + "\n");
    }
    // A2 45 to 48
    else if (noteNo == 45)
    {
      noteNo = 48;
      print("A2 to 48:"+ noteNo + "\n");
    }
    // G#2 44
    else if (noteNo == 44)
    {
      noteNo +=12;
      print("G#2 octave up:"+ noteNo + "\n");
    }
    // G2 43 to 47
    else if (noteNo == 43)
    {
      noteNo = 47;
      print("G2 to 47:"+ noteNo + "\n");
    }
    // F#2 42 41 40 39 D#
    else if (noteNo >= 39 && noteNo <= 42)
    {
      noteNo +=12;
      print("D#2 - F#2 octave up:"+ noteNo + "\n");
    }
    // D2 38 to 46
    else if (noteNo == 38)
    {
      noteNo = 46;
      print("D2 to 46:"+ noteNo + "\n");
    }
    // C#2 37
    else if (noteNo == 37)
    {
      noteNo +=12;
      print("C#2 octave up:"+ noteNo + "\n");
    }
    // C2 36 to 45
    else if (noteNo == 36)
    {
      noteNo = 45;
      print("C2 to 45:"+ noteNo + "\n");
    }

    note.noteNo = noteNo;
  }
}

float noteSize = 10;
float speed = 100/10;
float leftMargine = 30;

void DrawNote(float tick, int noteNo)
{
  fill(0, 200, 250);

  float x = leftMargine*4 + tick/speed;
  float y = height - (noteNo-41) * noteSize;

  if (x > width)
  {
    return;
  }


  print("Draw:"+ noteNo + "\n");

  ellipse(x-noteSize/2, y-noteSize/2, noteSize, noteSize);
}

void DrawBeat(float tick, int noteNo)
{
  fill(200, 0, 250);

  float x = leftMargine*4 + tick/speed;
  float y = height - (noteNo-41) * noteSize;

  if (x > width)
  {
    return;
  }


  ellipse(x-noteSize/2, y-noteSize/2, noteSize/2, noteSize/2);
}


void DrawMusic()
{

  float startTick = 480 * 4 * 6*0;
  beginRecord(SVG, "Music.svg");

  float wakuHieght = (30+6)*noteSize;

  noFill();
  rect(0, height/2-wakuHieght/2, width, wakuHieght);
  line(0, height/2, leftMargine, height/2+wakuHieght/2);
  noStroke();

  //DrawNote(-100, 72);
  for (int beat = 0; beat < 400; beat++)
  {
    DrawBeat(beat*480, 43);
    if (beat%4 ==0) {
      DrawBeat(beat*480, 42);
    }
  }

  for (Note note : notes)
  {
    if (note.tick >= startTick - 480*2) {
      DrawNote(note.tick-startTick, note.noteNo);
    }
  }


  endRecord();
}