demo1.ts

var fs = require('fs');
var Midi = require('jsmidgen');
var Util = require('jsmidgen').Util;
import mm = require('./MusicMaker')

var beat = 128;
var DrumNotes = mm.DrumNotes;
var selectRandom = mm.SelectRandom;
var makeChord = mm.MakeChord;
var addRhythmPattern = mm.AddRhythmPattern;
var ChordType = mm.ChordType;

class DemoPatterns {
    AddPickingPattern_4_1(track, aChord) {
        var intRoot = aChord[0];
        var intMiddle = aChord[1];
        var intFifth = aChord[2];

        track.addNote(0, intRoot, beat)
        track.addNote(0, intFifth, beat)
        track.addNote(0, intMiddle, beat)
        track.addNote(0, intFifth, beat)
    }

    AddPickingPattern_4_2(track, aChord) {
        var intRoot = aChord[0];
        var intNine = aChord[0] + 2;
        var intMiddle = aChord[1];
        var intFifth = aChord[2];
        var intRoot2 = aChord[0] + 12;
        var intNine2 = aChord[0] + 2 + 12;
        var intMiddle2 = aChord[1] + 12;
        var intFifth2 = aChord[2] + 12;

        track.addNote(0, intRoot, beat / 2)
        track.addNote(0, intNine, beat / 2)
        track.addNote(0, intMiddle, beat / 2)
        track.addNote(0, intFifth, beat / 2)

        track.addNote(0, intRoot2, beat / 2)
        track.addNote(0, intNine2, beat / 2)
        track.addNote(0, intMiddle2, beat / 2)
        track.addNote(0, intFifth2, beat / 2)
    }

    AddPickingPattern_4_3(track, aChord) {
        var intRoot = aChord[0];
        var intMiddle = aChord[1];
        var intFifth = aChord[2];
        var intRoot2 = aChord[0] + 12;
        var intMiddle2 = aChord[1] + 12;
        var intFifth2 = aChord[2] + 12;

        var list = new Array();
        list.push(intRoot);
        list.push(intMiddle);
        list.push(intFifth);
        list.push(intRoot2);
        list.push(intMiddle2);
        list.push(intFifth2);

        var i;
        for (i = 0; i < 8; i++) {
            var aNote = selectRandom(list);
            track.addNote(0, aNote, beat / 2);
        }

    }

    AddPickingPattern_4_4(track, aChord) {
        var intRoot = aChord[0] - 24;
        track.addNote(0, intRoot, beat * 3)
        track.addNote(0, intRoot, beat * 1)
    }

    AddPickingPattern_4_5(track, aChord) {
        var intRoot = aChord[0];
        var nine1 = aChord[0] + 2;
        var intMiddle = aChord[1];
        var intFifth = aChord[2];
        var intRoot2 = aChord[0] + 12;
        var nine2 = nine1 + 12;
        var intMiddle2 = aChord[1] + 12;
        var intFifth2 = aChord[2] + 12;

        var list = new Array();
        list.push(intRoot);
        list.push(nine1);
        list.push(nine2);
        list.push(intMiddle);
        list.push(intFifth);
        list.push(intRoot2);
        list.push(intMiddle2);
        list.push(intFifth2);

        var i;
        for (i = 0; i < 16; i++) {
            var aNote = selectRandom(list);
            track.addNote(0, aNote, beat / 4);
        }

    }

}


function demo1() {
    var file = new Midi.File();

    var chordList = new Array();
    chordList.push(makeChord("d4", ChordType.Minor));
    chordList.push(makeChord("a4", ChordType.Major));
    chordList.push(makeChord("d4", ChordType.Minor));
    chordList.push(makeChord("c4", ChordType.Major));
    chordList.push(makeChord("f4", ChordType.Major));
    chordList.push(makeChord("c4", ChordType.Major));
    chordList.push(makeChord("d4", ChordType.Minor));
    chordList.push(makeChord("a4", ChordType.Major));


    var track = new Midi.Track();
    track.setTempo(70);
    file.addTrack(track);
    let i = 0;
    for (i = 0; i < chordList.length; i++) {
        track.addNote(9, DrumNotes.BassDrum1, beat);
        track.addNote(9, DrumNotes.SnareDrum, beat);
        track.addNote(9, DrumNotes.BassDrum1, beat);
        track.addNote(9, DrumNotes.SnareDrum, beat);
    }

    track = new Midi.Track();
    file.addTrack(track);
    for (i = 0; i < chordList.length; i++) {
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
        track.addNote(9, DrumNotes.ClosedHighHat, beat / 2);
    }

    // track ================================================================================
    let patterns = new DemoPatterns();

    track = new Midi.Track();
    file.addTrack(track);
    track.setInstrument(8);
    track.setTempo(90);

    var j = 0;
    for (j = 0; j < chordList.length; j++) {
        patterns.AddPickingPattern_4_3(track, chordList[j]);
    }

    // track ================================================================================
    track = new Midi.Track();
    file.addTrack(track);
    track.setInstrument(8);

    var j = 0;
    for (j = 0; j < chordList.length; j++) {
        patterns.AddPickingPattern_4_3(track, chordList[j]);
    }

    // track ================================================================================

    track = new Midi.Track();
    file.addTrack(track);
    track.setInstrument(8);

    for (j = 0; j < chordList.length; j++) {
        patterns.AddPickingPattern_4_2(track, chordList[j]);
    }

    // track ================================================================================
    track = new Midi.Track();
    file.addTrack(track);
    for (j = 0; j < chordList.length; j++) {
        patterns.AddPickingPattern_4_4(track, chordList[j]);
    }

    // track ================================================================================


    fs.writeFileSync('test.mid', file.toBytes(), 'binary');



}

demo1();