Hello, pencil touch / Fil

Fil

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Hello

Edited

Feb 6, 2020

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Hello

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Hello, pencil touch

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mutable touches = null

{

clear;

const height = (width * 0.7) | 0;

const context = DOM.context2d(width, height),

canvas = context.canvas;

yield canvas;

let m;

d3.select(canvas)

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

m = [d3.mouse(canvas)];

})

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

d3.event.preventDefault();

d3.event.stopPropagation();

mutable touches = [...d3.event.touches];

const e = [...d3.event.touches].filter(e => e.touchType !== "direct")[0];

if (!e) return;

m.push(d3.mouse(canvas));

m = m.slice(-10);

context.beginPath();

context.lineWidth = 5 + e.force ** 2 * 130;

context.globalAlpha = e.force;

context.strokeStyle = d3.hsl(

(e.azimuthAngle * 180) / Math.PI,

(e.altitudeAngle / Math.PI) * 2,

1 - e.force

); //color((e.altitudeAngle / Math.PI) * 2);

context.moveTo(...m[0]);

for (const n of m) context.lineTo(...n);

context.stroke();

});

}

d3 = require("d3@5")

color = d3.scaleSequential(d3.interpolateMagma)

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