mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 00:27:58 +00:00
149 lines
No EOL
4.2 KiB
HTML
149 lines
No EOL
4.2 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>Analyser</title>
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<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
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<link rel="icon" type="image/png" sizes="174x174" href="./style/favicon.png">
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<script type="text/javascript" src="../build/Tone.js"></script>
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<script type="text/javascript" src="./scripts/jquery.min.js"></script>
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<script type="text/javascript" src="./scripts/draggabilly.js"></script>
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<script type="text/javascript" src="./scripts/Logo.js"></script>
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<script type="text/javascript" src="./scripts/StartAudioContext.js"></script>
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<script type="text/javascript" src="./scripts/Interface.js"></script>
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<link rel="stylesheet" type="text/css" href="./style/examples.css">
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<script type="text/javascript">
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// jshint ignore: start
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</script>
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<style type="text/css">
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canvas {
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margin-top: 2px;
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width: 100%;
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height: 255px;
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}
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</style>
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</head>
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<body>
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<div id="Content" class="FullScreen">
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<div id="Title">Analyser</div>
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<div id="Explanation">
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<a href="http://tonejs.org/docs/#Analyser" target="_blank">Tone.Analyser</a>
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analyses the incoming audio to produce a TypedArray of either the
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<a href="https://en.wikipedia.org/wiki/Fast_Fourier_transform" target="_blank">FFT data</a>
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or the waveform. The default <code>returnType</code> is "byte" which returns values
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in the range 0-255.
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</div>
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</div>
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<script type="text/javascript">
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//analyse the frequency/amplitude of the incoming signal
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var fft = new Tone.Analyser(32, "fft");
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//get the waveform data for the audio
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var waveform = new Tone.Analyser(1024, "waveform");
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var player = new Tone.Player({
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"url" : "./audio/FWDL.mp3",
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"loop" : true
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}).fan(fft, waveform).toMaster();
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</script>
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<script type="text/javascript">
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$(function(){
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//start button
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new Interface.Button({
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key : 32,
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type : "toggle",
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text : "Start",
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activeText : "Stop",
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start : function(){
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player.start();
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},
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end : function(){
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player.stop();
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}
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});
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//drawing the FFT
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var fftContext = $("<canvas>",{
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"id" : "fft"
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}).appendTo("#Content").get(0).getContext("2d");
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function drawFFT(values){
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fftContext.clearRect(0, 0, canvasWidth, canvasHeight);
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var barWidth = canvasWidth / fft.size;
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for (var i = 0, len = values.length; i < len; i++){
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var val = values[i] / 255;
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var x = canvasWidth * (i / len);
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var y = val * canvasHeight;
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fftContext.fillStyle = "rgba(0, 0, 0, " + val + ")";
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fftContext.fillRect(x, canvasHeight - y, barWidth, canvasHeight);
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}
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}
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//the waveform data
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var waveContext = $("<canvas>", {
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"id" : "waveform"
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}).appendTo("#Content").get(0).getContext("2d");
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var waveformGradient;
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function drawWaveform(values){
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//draw the waveform
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waveContext.clearRect(0, 0, canvasWidth, canvasHeight);
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var values = waveform.analyse();
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waveContext.beginPath();
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waveContext.lineJoin = "round";
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waveContext.lineWidth = 6;
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waveContext.strokeStyle = waveformGradient;
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waveContext.moveTo(0, (values[0] / 255) * canvasHeight);
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for (var i = 1, len = values.length; i < len; i++){
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var val = values[i] / 255;
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var x = canvasWidth * (i / len);
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var y = val * canvasHeight;
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waveContext.lineTo(x, y);
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}
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waveContext.stroke();
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}
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//size the canvases
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var canvasWidth, canvasHeight;
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function sizeCanvases(){
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canvasWidth = $("#fft").width();
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canvasHeight = $("#fft").height();
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waveContext.canvas.width = canvasWidth;
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fftContext.canvas.width = canvasWidth;
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waveContext.canvas.height = canvasHeight;
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fftContext.canvas.height = canvasHeight;
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//make the gradient
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waveformGradient = waveContext.createLinearGradient(0, 0, canvasWidth, canvasHeight);
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waveformGradient.addColorStop(0, "#ddd");
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waveformGradient.addColorStop(1, "#000");
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}
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sizeCanvases();
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$(window).resize(sizeCanvases);
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function loop(){
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requestAnimationFrame(loop);
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//get the fft data and draw it
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var fftValues = fft.analyse();
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drawFFT(fftValues);
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//get the waveform valeus and draw it
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var waveformValues = waveform.analyse();
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drawWaveform(waveformValues);
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}
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loop();
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});
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</script>
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</body>
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</html> |