114 lines
5.9 KiB
HTML
114 lines
5.9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset='UTF-8'>
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<title>Paul Walko - MUS 3064 Midterm Project</title>
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<script type='text/javascript' src='js/helperFunctions.js'></script>
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<script type='text/javascript' src='https://tonejs.github.io/build/Tone.min.js'></script>
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</head>
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<body>
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Select 1 or more tracks to play, then press 'Play/Pause':<br />
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<br />
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<input type='checkbox' id='at'>Appalachain Trail</input> <br />
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<input type='checkbox' id='pilotmtn'>Pilot Mountain</input> <br />
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<input type='checkbox' id='huck'>Huckleberry Trail</input> <br />
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<br />
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<button id='PlayPause'/>Play/Pause</button> <br />
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<script>
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let hz_lookup = {'2n': 120, '4n': 60, '8n': 30, '16n': 15, '32n': 7.5};
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let tracks = {'at': {'bpm_counter': 0, 'point_counter': 0, 'bpm': 0, 'frequency': 0, 'content': [], 'synth': new Tone.PolySynth(3).toMaster(), 'duration': '32n'},
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'pilotmtn': {'bpm_counter': 0, 'point_counter': 0, 'bpm': 0, 'frequency': 0, 'content': [], 'synth': new Tone.MembraneSynth().toMaster(), 'duration': '4n'},
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'huck': {'bpm_counter': 0, 'point_counter': 0, 'bpm': 0, 'frequency': 0, 'content': [], 'synth': new Tone.DuoSynth().toMaster(), 'duration': '8n'}};
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// Cycles trough different bpms every 5 seconds
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let cycle_counter = 0;
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function mySetup() {
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// Process track data
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for (track in tracks) {
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// Load tracks
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let xmlhttp = new XMLHttpRequest();
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xmlhttp.open('GET', 'gpx/' + track + '.xml', false);
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xmlhttp.send();
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// Parse tracks
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let points = xmlhttp.responseXML.getElementsByTagName('trkpt');
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for (let j = 1; j < points.length; j++) {
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// Get distance since last point
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let prevlat = points[j - 1].attributes.lat.value;
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let prevlon = points[j - 1].attributes.lon.value;
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let lat = points[j].attributes.lat.value;
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let lon = points[j].attributes.lon.value;
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let distance = getDistance(prevlat, prevlon, lat, lon, 'M');
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// Time since last track
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let prevtime = (new Date(points[j - 1]
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.children[1].textContent)).getTime() / 3600000;
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let time = (new Date(points[j].children[1]
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.textContent)).getTime() / 3600000;
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time = time - prevtime;
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// Get speed & elevation then add to dict
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//// Avg speed is about 10 MPH, so to make this usable
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//// everything is scaled by x20, which is used as the
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//// BPM
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let speed = scale(distance / time, 0, 50, 100, 200);
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let elevation = scale(parseInt(points[j].children[0].textContent), 500, 700, 3000, 4000);
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// TODO calculate direction
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tracks[track]['content'].push({/*'direction': direction, */
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'speed': speed, 'elevation': elevation});
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}
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// This should always be true but it doesn't hurt to make sure
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if (tracks[track]['content'].length > 0) {
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tracks[track]['bpm'] = tracks[track]['content'][0]['speed'];
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tracks[track]['frequency'] = tracks[track]['content'][0]['elevation'];
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}
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}
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// Overall BPM is 200, but the actual tracks don't always play on
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// every beat.
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// For example with a 150 BPM tune, the counter for that tune
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// plays a beat every 200 / 150 beats.
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Tone.Transport.bpm.value = 300;
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loopBeat = new Tone.Loop(beats, '16n');
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loopBeat.start(0);
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//bassSynth = new Tone.MembraneSynth().toMaster();
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//Tone.Transport.start();
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document.querySelector("#PlayPause").addEventListener("click", function(){
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Tone.Transport.toggle();
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});
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}
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function beats(time) {
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// Update 5 second cycle counter
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let seconds = 1;
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cycle_counter = Math.floor((cycle_counter + 1) % Math.round(Tone.Transport.bpm.value / hz_lookup['16n'] * seconds));
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for (track in tracks) {
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// Don't play track if checkbox is unchecked
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if (document.getElementById(track).checked == false) {
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continue;
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}
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let track_data = tracks[track];
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// Play each synth if bpm counter is ready
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if (track_data['bpm_counter'] == 0) {
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track_data['synth'].triggerAttackRelease(track['frequency'], track_data['duration'], time, 0.8);
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}
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// Update each bpm counter
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tracks[track]['bpm_counter'] = (track_data['bpm_counter'] + 1) % Math.round(Tone.Transport.bpm.value / track_data['bpm']);
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// Indicates 5 seconds has passed, so cycle to next point in data
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if (cycle_counter == 0) {
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tracks[track]['point_counter'] = (track_data['point_counter'] + 1) % track_data['content'].length;
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tracks[track]['bpm'] = track_data['content'][tracks[track]['point_counter']]['speed'];
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tracks[track]['frequency'] = track_data['content'][tracks[track]['point_counter']]['elevation'];
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}
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}
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}
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window.addEventListener('load', mySetup);
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</script>
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</body>
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</html>
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