siriWave.js的demo

demo.html

<style>body { background: #000; }</style>
<script src="../siriwave.js"></script>
<div id="container" style="width: 900px; height: 300px; background: #000"></div>
<script>
 
    var SW = new SiriWave({ });
 
    var ctx = new (window.AudioContext || window.webkitAudioContext)();
    var analyser = ctx.createAnalyser();
    analyser.connect(ctx.destination);
    analyser.fftSize = 2048;
 
    var bufferLength = analyser.frequencyBinCount;
    function getAverageVolume(data) {
        var values = 0;
        var length = data.length;
        for (var i = 0; i < data.length; i++) {
            values += data[i];
        }
        return values / data.length;
    }
 
    window.navigator.getUserMedia(
        { audio: true },
        function(stream) {
            var input = ctx.createMediaStreamSource(stream);
            console.log()
            input.connect(analyser);
 
            var processor = ctx.createScriptProcessor(2048, 1, 1);
            processor.connect(ctx.destination);
             
            processor.onaudioprocess = function() {
                var array =  new Uint8Array(analyser.frequencyBinCount);
                analyser.getByteFrequencyData(array);
                var average = getAverageVolume(array);
                SW.setAmplitude(average / 140);
            };
        },
        function(){
            console.log(1)
        }
    );
 
 
     
 
</script>

　　　　　　　　 style: 'ios9',

　　　　　　 speed: 0.1,

　　　　　　amplitude: 0.2,

　　　　　　speedInterpolationSpeed: 0,

　　　　　　frequency: 2,

　　　　　　 height: 424,

　　　　　　width: 964,

　　　　　　container: document.getElementById('container'),

　　　　　　autostart: true

　　siriwave.js

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(function() {
//
 
// Siri Wave iOS9 Style curve
 
function SiriWave9Curve(opt) {
    this.controller = opt.controller;
    this.definition = opt.definition;
    this.tick = 0;
 
    this._respawn();
}
 
SiriWave9Curve.prototype._respawn = function() {
    this.amplitude = 0.3 + Math.random() * 0.7;
    this.seed = Math.random();
    this.openClass = 2 + (Math.random()*3)|0;
};
 
SiriWave9Curve.prototype._ypos = function(i) {
    var p = this.tick;
    var y = -1 * Math.abs(Math.sin(p)) * this.controller.amplitude * this.amplitude * this.controller.cache.heightMax * Math.pow(1 / (1 + Math.pow(this.openClass * i, 2)), 2);
 
    if (Math.abs(y) < 0.001) {
        this._respawn();
    }
 
    return y;
};
 
SiriWave9Curve.prototype._draw = function(sign) {
    var ctx = this.controller.ctx;
 
    this.tick += this.controller.speed * (1 - 0.5 * Math.sin(this.seed * Math.PI));
 
    ctx.beginPath();
 
    var xBase = this.controller.cache.width2 + (-this.controller.cache.width4 + this.seed * (this.controller.cache.width2));
    var yBase = this.controller.cache.height2;
 
    var x, y;
    var xInit = null;
 
    for (var i = -3; i <= 3; i += 0.01) {
        x = xBase + i * this.controller.cache.width4;
        y = yBase + ((sign || 1) * this._ypos(i));
 
        xInit = xInit || x;
 
        ctx.lineTo(x, y);
    }
 
    var height = Math.abs(this._ypos(0));
 
    var gradient = ctx.createRadialGradient(xBase, yBase, height * 1.15, xBase, yBase, height * 0.3);
    gradient.addColorStop(0, 'rgba(' + this.definition.color + ', 0.4)');
    gradient.addColorStop(1, 'rgba(' + this.definition.color + ', 0.2)');
    ctx.fillStyle = gradient;
 
    ctx.lineTo(xInit, yBase);
    ctx.closePath();
 
    ctx.fill();
};
 
SiriWave9Curve.prototype.draw = function() {
    this._draw(-1);
    this._draw(1);
};
 
SiriWave9Curve.prototype.definition = [
{ color: '32,133,252' },
{
    color: '94,252,169'
},
 
{
    color: '253,71,103'
},
{
    color: '255,252,0'
},
{ color: '253,0,255' }
];
 
// Standard Curve
 
function SiriWaveCurve(opt) {
    this.controller = opt.controller;
    this.definition = opt.definition;
}
 
SiriWaveCurve.prototype._globAttenuationEquation = function(x) {
    if (SiriWaveCurve.prototype._globAttenuationEquation.cache[x] == null) {
        SiriWaveCurve.prototype._globAttenuationEquation.cache[x] = Math.pow(4 / (4 + Math.pow(x, 4)), 4);
    }
    return SiriWaveCurve.prototype._globAttenuationEquation.cache[x];
};
SiriWaveCurve.prototype._globAttenuationEquation.cache = {};
 
SiriWaveCurve.prototype._xpos = function(i) {
    return this.controller.cache.width2 + i * this.controller.cache.width4;
};
 
SiriWaveCurve.prototype._ypos = function(i) {
    var att = (this.controller.cache.heightMax * this.controller.amplitude) / this.definition.attenuation;
    return this.controller.cache.height2 + this._globAttenuationEquation(i) * att * Math.sin(this.controller.frequency * i - this.controller.phase);
};
 
SiriWaveCurve.prototype.draw = function() {
    var ctx = this.controller.ctx;
 
    ctx.moveTo(0,0);
    ctx.beginPath();
    ctx.strokeStyle = 'rgba(' + this.controller.color + ',' + this.definition.opacity + ')';
    ctx.lineWidth = this.definition.lineWidth;
 
    for (var i = -2; i <= 2; i += 0.01) {
        var y = this._ypos(i);
 
        if (Math.abs(i) >= 1.90) y = this.controller.cache.height2;
 
        ctx.lineTo(this._xpos(i), y);
    }
 
    ctx.stroke();
};
 
SiriWaveCurve.prototype.definition = [
{ attenuation: -2, lineWidth: 1, opacity: 0.1 },
{ attenuation: -6, lineWidth: 1, opacity: 0.2 },
{ attenuation: 4, lineWidth: 1, opacity: 0.4 },
{ attenuation: 2, lineWidth: 1, opacity: 0.6 },
{ attenuation: 1, lineWidth: 1.5, opacity: 1 },
];
 
// Expose API
 
function SiriWave(opt) {
    opt = opt || {};
 
    this.phase = 0;
    this.run = false;
    this.cache = {};
 
    if (opt.container == null) {
        console.warn("SiriWaveJS: no container defined, using body");
        opt.container = document.body;
    }
 
    this.style = opt.style || 'ios';
 
    this.container = opt.container;
 
    this.width = opt.width || window.getComputedStyle(this.container).width.replace('px', '');
    this.height = opt.height || window.getComputedStyle(this.container).height.replace('px', '');
    this.ratio = opt.ratio || window.devicePixelRatio || 1;
 
    this.cache.width = this.ratio * this.width;
    this.cache.height = this.ratio * this.height;
    this.cache.height2 = this.cache.height / 2;
    this.cache.width2 = this.cache.width / 2;
    this.cache.width4 = this.cache.width / 4;
    this.cache.heightMax = (this.cache.height2) - 4;
 
    // Constructor opt
 
    this.amplitude = (opt.amplitude == undefined) ? 1 : opt.amplitude;
    this.speed = (opt.speed == undefined) ? 0.2 : opt.speed;
    this.frequency = (opt.frequency == undefined) ? 6 : opt.frequency;
    this.color = this._hex2rgb(opt.color || '#fff');
 
    // Interpolation
 
    this.speedInterpolationSpeed = opt.speedInterpolationSpeed || 0.005;
    this.amplitudeInterpolationSpeed = opt.amplitudeInterpolationSpeed || 0.05;
 
    this.cache.interpolation = {
        speed: this.speed,
        amplitude: this.amplitude
    };
 
    // Canvas
 
    this.canvas = document.createElement('canvas');
    this.ctx = this.canvas.getContext('2d');
    this.canvas.width = this.cache.width;
    this.canvas.height = this.cache.height;
 
    if (opt.cover) {
        this.canvas.style.width = this.canvas.style.height = '100%';
    } else {
        this.canvas.style.width = (this.cache.width / this.ratio) + 'px';
        this.canvas.style.height = (this.cache.height / this.ratio) + 'px';
    }
 
    this.curves = [];
 
    var i = 0, j = 0;
    if (this.style === 'ios9') {
        for (; i < SiriWave9Curve.prototype.definition.length; i++) {
            for (j = 0; j < (3 * Math.random()) | 0; j++) {
                this.curves.push(new SiriWave9Curve({
                    controller: this,
                    definition: SiriWave9Curve.prototype.definition[i]
                }));
            }
        }
    } else {
        for (; i < SiriWaveCurve.prototype.definition.length; i++) {
            this.curves.push(new SiriWaveCurve({
                controller: this,
                definition: SiriWaveCurve.prototype.definition[i]
            }));
        }
    }
 
    // Start
    this.container.appendChild(this.canvas);
    if (opt.autostart) {
        this.start();
    }
}
 
SiriWave.prototype._hex2rgb = function(hex){
    var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
    hex = hex.replace(shorthandRegex, function(m,r,g,b) { return r + r + g + g + b + b; });
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ?
    parseInt(result[1],16).toString()+','+parseInt(result[2], 16).toString()+','+parseInt(result[3], 16).toString()
    : null;
};
 
SiriWave.prototype._interpolate = function(propertyStr) {
    increment = this[ propertyStr + 'InterpolationSpeed' ];
 
    if (Math.abs(this.cache.interpolation[propertyStr] - this[propertyStr]) <= increment) {
        this[propertyStr] = this.cache.interpolation[propertyStr];
    } else {
        if (this.cache.interpolation[propertyStr] > this[propertyStr]) {
            this[propertyStr] += increment;
        } else {
            this[propertyStr] -= increment;
        }
    }
};
 
SiriWave.prototype._clear = function() {
    this.ctx.globalCompositeOperation = 'destination-out';
    this.ctx.fillRect(0, 0, this.cache.width, this.cache.height);
    this.ctx.globalCompositeOperation = 'source-over';
};
 
SiriWave.prototype._draw = function() {
    for (var i = 0, len = this.curves.length; i < len; i++) {
        this.curves[i].draw();
    }
};
 
SiriWave.prototype._startDrawCycle = function() {
    if (this.run === false) return;
    this._clear();
 
    // Interpolate values
    this._interpolate('amplitude');
    this._interpolate('speed');
 
    this._draw();
    this.phase = (this.phase + Math.PI * this.speed) % (2 * Math.PI);
 
    if (window.requestAnimationFrame) {
        window.requestAnimationFrame(this._startDrawCycle.bind(this));
    } else {
        setTimeout(this._startDrawCycle.bind(this), 20);
    }
};
 
/* API */
 
SiriWave.prototype.start = function() {
    this.phase = 0;
    this.run = true;
    this._startDrawCycle();
};
 
SiriWave.prototype.stop = function() {
    this.phase = 0;
    this.run = false;
};
 
SiriWave.prototype.setSpeed = function(v, increment) {
    this.cache.interpolation.speed = v;
};
 
SiriWave.prototype.setAmplitude = function(v) {
    this.cache.interpolation.amplitude = Math.max(Math.min(v, 1), 0);
};
 
if (typeof define === 'function' && define.amd) {
    define(function(){ return SiriWave; });
} else {
    window.SiriWave = SiriWave;
}
 
//
})();