Double Histogram
Code
ChartUtil.tsx
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"use client"
// reference: https://d3-graph-gallery.com/graph/histogram_double.html
import React, { useEffect, useCallback, useRef } from "react";
import * as d3 from "d3";
import { useResizeObserver } from "@/hooks/useResizeObserver";
import { ChartProps } from "@/types";
const ChartUtil = ({ data: rawData }: ChartProps) => {
const containerRef = useRef<HTMLDivElement | null>(null);
const data: any[] = Object.values(rawData);
const renderFunc = useCallback(async () => {
const container = containerRef.current as HTMLElement;
if (!container) return;
const margin = { top: 25, right: 10, bottom: 25, left: 50 },
width = container.offsetWidth - margin.left - margin.right,
height = 600 - margin.top - margin.bottom;
// append the svg object to the body of the page
const svg = d3
.select(container)
.html("")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", `translate(${margin.left}, ${margin.top})`);
const x = d3.scaleLinear().domain([-4, 9]).range([0, width]);
svg
.append("g")
.attr("transform", `translate(0, ${height})`)
.call(d3.axisBottom(x))
.call((d) =>
d
.selectAll("text")
.attr("font-family", "Space Mono")
.attr("font-size", "12px")
);
const histogram = d3
.histogram()
.value(function (d: any) {
return +d.value;
}) // I need to give the vector of value
.domain([-4, 9]) // then the domain of the graphic
.thresholds(x.ticks(40)); // then the numbers of bins
// And apply twice this function to data to get the bins.
const bins1 = histogram(
data.filter(function (d: any) {
return d.type === "variable 1";
})
);
const bins2 = histogram(
data.filter(function (d: any) {
return d.type === "variable 2";
})
);
const y = d3.scaleLinear().range([height, 0]);
y.domain([
0,
d3.max(bins1, function (d) {
return d.length;
}) ?? 0,
]); // d3.hist has to be called before the Y axis obviously
svg
.append("g")
.call(d3.axisLeft(y))
.call((d) =>
d
.selectAll("text")
.attr("font-family", "Space Mono")
.attr("font-size", "12px")
);
svg
.selectAll("rect")
.data(bins1)
.join("rect")
.attr("x", 1)
.attr("transform", function (d: any) {
return `translate(${x(d.x0)} , ${y(d.length)})`;
})
.attr("width", function (d: any) {
return Math.max(x(d.x1) - x(d.x0) - 1, 0);
})
.attr("height", function (d: any) {
return height - y(d.length);
})
.style("fill", "#69b3a2")
.style("opacity", 0.8);
svg
.selectAll("rect2")
.data(bins2)
.enter()
.append("rect")
.attr("x", 1)
.attr("transform", function (d: any) {
return `translate(${x(d.x0)}, ${y(d.length)})`;
})
.attr("width", function (d: any) {
return Math.max(x(d.x1) - x(d.x0) - 1, 0);
})
.attr("height", function (d: any) {
return height - y(d.length);
})
.style("fill", "#4060aa")
.style("opacity", 0.8);
}, [data]);
useEffect(() => {
containerRef.current !== null && renderFunc();
}, [renderFunc]);
const resizeHandler = useCallback(() => {
containerRef.current !== null && renderFunc();
}, [renderFunc]);
useResizeObserver(containerRef, resizeHandler);
return <div ref={containerRef}></div>;
};
export default ChartUtil;