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Amelie.jsx
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Amelie.jsx
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/** @jsx React.DOM */
(function main($document, $react, $d3) {
"use strict";
/**
* @module Amelie
* @author Adam Timberlake
* @link https://github.com/Wildhoney/Amelie
*/
var Amelie = $react.createClass({
/**
* @method componentDidMount
* @return {void}
*/
componentDidMount: function componentDidMount() {
// Once the component has been rendered we can listen for the "canplay" event to setup
// the audio context to begin analysing the audio stream.
this.getAudioElement().addEventListener('canplay', this.configureAudioContext);
},
/**
* @method getInitialState
* @return {Object}
*/
getInitialState: function getInitialState() {
return { analyser: null };
},
/**
* @method getAudioElement
* @return {HTMLElement}
*/
getAudioElement: function getAudioElement() {
return this.getDOMNode().querySelector('audio');
},
/**
* @method configureAudioContext
* @return {void}
*/
configureAudioContext: function configureAudioContext() {
// Dependencies for analysing the audio stream.
var ContextClass = (AudioContext || mozAudioContext || webkitAudioContext || oAudioContext || msAudioContext);
if (!ContextClass) {
// AudioContext API isn't supported.
throw "Amelie: AudioContext API unavailable in current browser. Please try another!";
}
// Audio context instantiation.
var context = new ContextClass(),
analyser = context.createAnalyser();
// Route the audio source through our visualiser.
var source = context.createMediaElementSource(this.getAudioElement());
source.connect(analyser);
// Create the analyser object and specify its FFT size in bytes.
analyser.connect(context.destination);
analyser.fftSize = 128;
// ...And now we can begin the visualisation rendering!
this.setState({ analyser: analyser });
},
/**
* @method render
* @return {XML}
*/
render: function render() {
return (
<section className="amelie">
<audio controls="controls" autoPlay="autoplay" src={ this.props.audio }></audio>
<Visualiser analyser={ this.state.analyser } />
</section>
);
}
});
/**
* @module Amelie
* @submodule Visualiser
* @author Adam Timberlake
* @link https://github.com/Wildhoney/Amelie
*/
var Visualiser = $react.createClass({
/**
* @method componentWillReceiveProps
* @param nextProps {Object}
* @return {void}
*/
componentWillReceiveProps: function componentWillReceiveProps(nextProps) {
if (nextProps.analyser) {
// We have the `AnalyserNode` and therefore we're ready to analyse the
// audio track.
this.analyseAudioStream(nextProps.analyser);
}
},
/**
* @method getInitialState
* @return {Object}
*/
getInitialState: function getInitialState() {
return { cursor: { x: 0, y: 0 }, frequencyData: [] };
},
/**
* @method analyseAudioStream
* @param analyser {AnalyserNode}
* @return {void}
*/
analyseAudioStream: function anaylseAudioStream(analyser) {
// Round and round we go...
(requestAnimationFrame || mozRequestAnimationFrame || webkitRequestAnimationFrame)(function() {
anaylseAudioStream.call(this, analyser);
}.bind(this));
// Analyse the frequency data for the current audio track!
var frequencyData = new Uint8Array(analyser.frequencyBinCount);
analyser.getByteFrequencyData(frequencyData);
// Define the items required to create the visualisation...
this.setState({ frequencyData: frequencyData, fftSize: analyser.fftSize });
},
/**
* @method setCursorPosition
* @param event {Object}
* @return {void}
*/
setCursorPosition: function setCursorPosition(event) {
this.setState({ cursor: { x: event.clientX, y: event.clientY } });
},
/**
* @method render
* @return {XML}
*/
render: function render() {
return (
<section className="visualiser" onMouseMove={this.setCursorPosition}>
<Canvas frequencyData={this.state.frequencyData} cursor={this.state.cursor} fftSize={this.state.fftSize} />
</section>
);
}
});
/**
* @module Amelie
* @submodule Canvas
* @author Adam Timberlake
* @link https://github.com/Wildhoney/Amelie
*/
var Canvas = $react.createClass({
/**
* @method componentDidMount
* @return {void}
*/
componentDidMount: function componentDidMount() {
// Configure the D3 SVG component.
var d3Element = $d3.select(this.getDOMNode())
.append('svg')
.attr('width', this.state.size[0])
.attr('height', this.state.size[1])
.append('g');
this.getDOMNode().style.width = this.state.size[0] + 'px';
this.getDOMNode().style.height = this.state.size[1] + 'px';
/**
* Responsible for generating the greyscale colours for the circle.
*
* @return {Function}
* @constructor
*/
var ColourGenerator = function ColourGenerator() {
var cache = [];
return function(index) {
if (!cache[index]) {
// Generate a random set of RGB values for the current circle.
var random = Math.round((Math.random() * 255));
cache[index] = 'rgb(' + random + ', ' + random + ', ' + random + ')';
}
return cache[index];
};
};
this.setState({ d3: d3Element, colours: new ColourGenerator() });
},
/**
* @method componentWillReceiveProps
* @param nextProps {Object}
* @return {void}
*/
componentWillReceiveProps: function componentWillReceiveProps(nextProps) {
if (this.state.circles.length === 0 && nextProps.fftSize) {
// We know the `fftSize` and can therefore pre-render the required number of
// circles to quicken the rendering.
this.setState({ circles: this.createCircles(nextProps.fftSize) });
}
},
/**
* @method createCircles
* @param amountOfCircles {Number}
* @return {Array}
*/
createCircles: function createCircles(amountOfCircles) {
var circles = [];
for (var index = 0; index < amountOfCircles; index++) {
circles.push(this.state.d3.append('circle'));
}
return circles;
},
/**
* @method getInitialState
* @return {Object}
*/
getInitialState: function getInitialState() {
return { circles: [], colours: function noop() {}, size: [400, 400] };
},
/**
* @method renderCircles
* @param frequencyData {Uint8Array}
* @return {void}
*/
renderCircles: function renderCircles(frequencyData) {
if (this.state.circles.length === 0) {
// Circles haven't yet been pre-rendered and therefore we're unable to go
// any further.
return;
}
var colours = this.state.colours,
positions = this.computeCxCy();
for (var index = 0, maxLength = frequencyData.length; index < maxLength; index++) {
this.state.circles[index].attr('cx', positions.cx).attr('cy', positions.cy)
.attr('r', frequencyData[index] / 2.5)
.style('fill', colours(index));
}
// Create the mini little circles.
this.renderSplodges(frequencyData);
},
/**
* @method computeCxCy
* @return {Object}
*/
computeCxCy: function computeCxCy() {
return { cx: this.state.size[0] - 110, cy: this.state.size[1] - 110 };
},
/**
* @method renderSplodges
* @param frequencyData {Uint8Array}
* @return {void}
*/
renderSplodges: function renderSplodges(frequencyData) {
var positions = this.computeCxCy(),
length = frequencyData.length,
trebleParts = (length - (length / 4)),
trebleArray = Array.prototype.slice.call(frequencyData).splice(length - trebleParts),
trebleSegment = trebleArray.reduce(function reduce(currentValue, value) {
return currentValue + value;
}, 0);
if (trebleSegment !== 0) {
positions.cx += (Math.random() * 190) - 95;
positions.cy += (Math.random() * 190) - 95;
var circle = this.state.d3.append('circle').attr('cx', positions.cx).attr('cy', positions.cy)
.attr('r', trebleSegment / 40).style('fill', this.getRandomColour());
circle.transition().attr('r', 0).duration(500).remove();
}
},
/**
* @method getRandomColour
* @return {String}
*/
getRandomColour: function getRandomColour() {
var colours = ['267831', 'B1B541', 'FFCD36', 'D60404', '1F0404'];
return '#' + colours[Math.floor(Math.random() * colours.length)];
},
/**
* @method positionDOMElement
* @param cursorData {Object}
* @return {void}
*/
positionDOMElement: function positionDOMElement(cursorData) {
this.getDOMNode().style.left = (cursorData.x - (this.state.size[0] / 2)) + 'px';
this.getDOMNode().style.top = (cursorData.y - (this.state.size[1] / 2)) + 'px';
},
/**
* @method render
* @return {XML}
*/
render: function render() {
if (this.props.frequencyData) {
// We're ready to begin rendering the circles for this particular canvas element.
this.renderCircles(this.props.frequencyData);
if (this.state.d3) {
this.positionDOMElement(this.props.cursor);
}
}
return (
<div className="canvas-container" />
);
}
});
// It's time to throw everything to the devil and go to Kislovodsk...
var amelieNode = $document.querySelector('amelie');
$react.render(<Amelie audio={amelieNode.getAttribute('data-audio')} />, amelieNode);
})(window.document, window.React, window.d3);