Discrete distribution input / Fil

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Published

Edited

Dec 4, 2020

5 stars

viewof d = distribution()

function distribution({

n = 10,

d = Array.from({ length: n }, Math.random),

height = 100,

width = 600

} = {}) {

const value = d;

const x = d3

.scaleLinear()

.domain([0, n])

.range([0, width]);

const y = d3

.scaleLinear()

.domain([0, 1])

.range([height, 0])

.clamp(true);

const svg = d3

.create("svg")

.attr("viewBox", [0, 0, width, height])

.attr("width", width);

svg

.append("line")

.attr("x1", x(0))

.attr("x2", x(n))

.attr("y1", y(0))

.attr("y2", y(0))

.attr("stroke", "#000");

const rect = svg

.selectAll("rect")

.data({ length: n })

.join("rect")

.attr("x", (_, i) => x(i))

.attr("width", width / n - 2);

function update() {

normalize(value);

rect.attr("y", (_, i) => y(value[i]));

rect.attr("height", (_, i) => Math.abs(-y(value[i]) + y(0)));

svg.node().dispatchEvent(new CustomEvent('input'));

}

update();

const drag = d3

.drag()

.subject(event => Math.floor(x.invert(event.x)))

.on("drag", event => {

value[event.subject] = y.invert(event.y);

update();

});

svg.call(drag);

return Object.assign(svg.node(), { value });

function normalize(D) {

const sum = D.reduce((a, b) => a + b),

sum1 = sum ? 1 / sum : 1;

for (let i = 0; i < D.length; i++) D[i] *= sum1;

}

d3 = require("d3@6")

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