FFT / Bairui Su | Observable

Creative generation toolmaker, believe that today's tool help shape tomorrow’s art. Creator Charming.js. Author @antv/g2@5.x.

Public

Edited

Feb 1

{

const size = 400;

const url = await FileAttachment("blip.wav").url();

const sound = new Tone.Player(url).toDestination();

const play = () => sound.start();

const analyzer = new Tone.FFT(512);

const [state] = cm

.flow()

.let("d", "")

.on("loop", () => {

const frequency = analyzer.getValue();

state.d = cm.area(frequency, {

x: (d, i) =>

cm.map(

Math.log(Math.max(0.1, i)),

0.1,

Math.log(frequency.length),

size + 2

), // log(0) is invliad!

y0: size,

y1: (d) => cm.map(d, 0.1, -127, 0, size, 0),

curve: d3.curveBasis

});

})

.join();

sound.connect(analyzer);

await Tone.loaded;

return svg.svg({ width: size, height: size, onclick: play }, [

svg.rect({ x: 0, y: 0, width: size, height: size, fill: "black" }),

svg.path({ d: cm.$(() => state.d), fill: "white" })

]);

}

svg = cm.svg

import { cm } from "@charming-art/charmingjs-next"

Tone = require("tone")

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