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tone-editor.html
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<!--
Copyright 2012, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
Title
</title>
<link rel="stylesheet" type="text/css" href = "style/simple.css" />
<!-- Slider stuff -->
<script type="text/javascript" src="lib/events.js"></script>
<script type="text/javascript" src="lib/knob.js"></script>
<style type="text/css">
#slider { margin: 10px; }
</style>
<!-- Our javascript code -->
<script type="text/javascript">
var defaultFrequency = 100;
var context;
var source;
var currentView;
var editorView;
var views;
// Initialization.
window.onload = function() {
source = new Source();
editorView = new ToneEditorView(context, "tone-editor");
editorView.draw();
var controls = document.getElementById("controls");
views = new Array();
var j = 0;
views[j++] = new KnobView("pitch", defaultFrequency, 5, 24000, UNITS.hertz, 0, true, function(value) { source.setFrequency(value); } );
installViews(views, controls);
}
function Source() {
context = new AudioContext();
var osc1 = context.createOscillator();
var osc2 = context.createOscillator();
this.osc1 = osc1;
this.osc2 = osc2;
osc1.frequency.value = defaultFrequency;
osc2.frequency.value = defaultFrequency;
osc1.noteOn(0);
osc2.noteOn(0);
// Gain nodes for cross-fading between the two oscillators.
var gainNode1 = context.createGainNode();
var gainNode2 = context.createGainNode();
this.gainNode1 = gainNode1;
this.gainNode2 = gainNode2;
gainNode1.gain.value = 1;
gainNode2.gain.value = 0;
osc1.connect(gainNode1);
osc2.connect(gainNode2);
gainNode1.connect(context.destination);
gainNode2.connect(context.destination);
// Cross-fading state.
this.lastCrossfadeTime = -1;
this.hasDeferredCrossfade = false;
this.crossFadeDuration = 0.060;
this.scheduleOffset = 0.020;
this.activeOsc = 0; // osc1
}
Source.prototype.setWaveTable = function(wavetable) {
var currentTime = context.currentTime;
if (this.lastCrossfadeTime + this.crossFadeDuration <= currentTime) {
var startGainNode;
var endGainNode;
if (this.activeOsc == 0) {
// Cross-fade osc1 -> osc2.
startGainNode = this.gainNode1;
endGainNode = this.gainNode2;
this.osc2.setWaveTable(wavetable);
// console.log("osc1 -> osc2");
} else {
// Cross-fade osc2 -> osc1.
startGainNode = this.gainNode2;
endGainNode = this.gainNode1;
this.osc1.setWaveTable(wavetable);
// console.log("osc2 -> osc1");
}
// Toggle active oscillator.
this.activeOsc = 1 - this.activeOsc;
var startTime = currentTime + this.scheduleOffset;
var endTime = startTime + this.crossFadeDuration;
startGainNode.gain.cancelScheduledValues(0);
endGainNode.gain.cancelScheduledValues(0);
startGainNode.gain.setValueAtTime(1, startTime);
startGainNode.gain.linearRampToValueAtTime(0, endTime);
endGainNode.gain.setValueAtTime(0, startTime);
endGainNode.gain.linearRampToValueAtTime(1, endTime);
this.lastCrossfadeTime = startTime;
}
}
Source.prototype.setFrequency = function(value) {
this.osc1.frequency.value = value;
this.osc2.frequency.value = value;
}
function ToneEditorView(context, name) {
this.context = context;
this.name = name;
this.numPartials = 4096;
this.partials = new Float32Array(this.numPartials);
this.positions = new Float32Array(this.numPartials);
// Initialize to just a few partials.
var p = this.partials;
p[1] = 1;
p[2] = 0.5;
p[3] = 0.1;
var wavetable = context.createWaveTable(this.partials, this.partials);
source.setWaveTable(wavetable);
this.backgroundColor = "rgb(60,40,40)";
this.curveColor = "rgb(255,0,0)";
this.textColor = "rgb(255,255,255)";
this.attach();
}
ToneEditorView.prototype.attach = function() {
// Create the canvas
var canvas = document.getElementById(this.name);
this.canvas = canvas;
var ctx = canvas.getContext('2d');
this.ctx = ctx;
this.width = canvas.width;
this.height = canvas.height;
var view = this;
canvas.addEventListener("mousedown",
function(event) {
var position = getElementCoordinates(view, event);
currentView = view;
view.isDragging = true;
view.startPosition = position;
view.mouseDown(position);
},
true
);
// Note: document handles mouseup and mousemove events.
document.addEventListener("mousemove",
function(event) {
if (currentView && currentView == view) {
var position = getElementCoordinates(currentView.canvas, event);
currentView.mouseMove(position);
}
},
true
);
document.addEventListener("mouseup",
function(event) {
if (currentView && currentView == view) {
view.isDragging = false;
var position = getElementCoordinates(currentView.canvas, event);
currentView.mouseUp(position);
currentView = 0;
}
},
true
);
this.draw();
}
ToneEditorView.prototype.draw = function() {
var ctx = this.ctx;
var width = this.width;
var height = this.height;
// Draw background.
ctx.fillStyle = this.backgroundColor;
ctx.fillRect(0,0, width, height);
ctx.strokeStyle = this.curveColor;
var kXScale = width;
var kXOffset = 10.0;
var p = this.partials;
var n = this.numPartials;
var m = Math.log(n) / Math.LN2;
var positions = this.positions;
for (var i = 1; i < n; i++) {
var x = (Math.log(i) / Math.LN2) / m;
x *= kXScale;
x += kXOffset;
positions[i] = x;
var y = height - height * p[i]; // linear
ctx.beginPath();
ctx.moveTo(x, y);
ctx.lineTo(x, height);
ctx.stroke();
}
}
ToneEditorView.prototype.mouseDown = function(position) {
this.mLastMouseX = -1.0;
}
ToneEditorView.prototype.mouseMove = function(position) {
if (this.isDragging) {
this.mouseDrag(position);
}
}
ToneEditorView.prototype.mouseDrag = function(position) {
var hitPt = position;
var ctx = this.ctx;
var width = this.width;
var height = this.height;
var mLastMouseX = this.mLastMouseX;
var x = hitPt.x;
var y = hitPt.y;
var y_normalized = (height - y) / height;
if (y_normalized < 0.0)
y_normalized = 0.0;
if (mLastMouseX == -1.0)
mLastMouseX = x;
var x1 = x < mLastMouseX ? x : mLastMouseX;
var x2 = x > mLastMouseX ? x : mLastMouseX;
var p = this.partials;
var n = this.numPartials;
var positions = this.positions;
for (var i = 1; i < n; i++) {
var posX = positions[i];
if (posX >= x1 && posX <= x2) {
p[i] = y_normalized;
}
}
this.mLastMouseX = hitPt.x;
this.partials[0] = 0;
var wavetable = context.createWaveTable(this.partials, this.partials);
source.setWaveTable(wavetable);
this.draw();
}
ToneEditorView.prototype.mouseUp = function(position) {
}
</script>
</head>
<body>
<canvas id="tone-editor" width="1280px" height="800px"></canvas>
<!-- Sliders and other controls will be added here -->
<div id="controls"> </div>
</body>
</html>