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Looping equalizer gif https://twitter.com/GMartigny/status/1203716578744963072
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Looping gifs</title> | |
| </head> | |
| <body> | |
| <script src="https://unpkg.com/pencil.js"></script> | |
| <script src="https://unpkg.com/@pencil.js/gif"></script> | |
| <script src="https://unpkg.com/tumult/dist/tumult.min.js"></script> | |
| <script> | |
| const { Perlin3 } = tumult; | |
| const { OffScreenCanvas, Container, Rectangle, LinearGradient, gif, Math: M, Position } = Pencil; | |
| const scene = new OffScreenCanvas(568, 300); | |
| const noise = new Perlin3(); | |
| const { width, height } = scene; | |
| const synthWidth = width * 0.8; | |
| const synthHeight = height * 0.6; | |
| const nbBars = 30; | |
| const margin = 4; | |
| const synth = new Container([(width - synthWidth) / 2, (height - synthHeight) / 2 + synthHeight], { | |
| scale: [1, -1], | |
| }); | |
| const barsWidth = Math.round(synthWidth / nbBars); | |
| const barsOptions = { | |
| fill: new LinearGradient(undefined, [0, synthHeight], { | |
| 0: "#15c20a", | |
| 1: "#da0d19", | |
| }), | |
| }; | |
| const bars = []; | |
| for (let i = 0; i < nbBars; ++i) { | |
| bars.push(new Rectangle([Math.floor(i * barsWidth), 0], barsWidth - margin, 0, barsOptions)); | |
| } | |
| synth.add(...bars, new Rectangle([0, -margin - 4], synthWidth, 4, { | |
| fill: "#333", | |
| })); | |
| scene.add(synth); | |
| const nbFrame = 50; | |
| const norm = new Position(0, 1); | |
| synth.on("draw", () => { | |
| const pos = norm.clone().rotate(synth.frameCount / nbFrame); | |
| const coords = [pos.x + 10, pos.y + 10]; | |
| bars.forEach((bar, i) => { | |
| const value = noise.octavate(2, i / 6, ...coords); | |
| const corrected = M.map(value, -0.7, 0.7, 0, 1) ** 2; | |
| bar.height = M.lerp(bar.height, corrected * synthHeight, 1); | |
| }); | |
| }, true); | |
| console.log("Working ..."); | |
| console.time("gif"); | |
| gif(scene, nbFrame, { | |
| speed: 0.15, | |
| alphaThreshold: 1e-5, | |
| }).then((img) => { | |
| console.timeEnd("gif"); | |
| document.body.appendChild(img); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
Author
GMartigny
commented
May 7, 2020
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