Basic Arc Diagram
Code
ChartUtil.tsx
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"use client";
import { ChartProps } from "@/types";
import React, { useRef, useCallback, useEffect } from "react";
import { useResizeObserver } from "@/hooks/useResizeObserver";
import * as d3 from "d3";
const ChartUtil = ({ data }: ChartProps) => {
const containerRef = useRef<HTMLDivElement | null>(null);
const renderFunc = useCallback(() => {
const container = containerRef.current as HTMLElement;
if (!container) return;
const margin = { top: 25, right: 10, bottom: 10, left: 10 },
width = container.offsetWidth - margin.left - margin.right,
height = container.offsetWidth * 0.4 - margin.top - margin.bottom;
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 + ")");
// List of node names
var allNodes: any[] = data.nodes.map((d: any) => d.name);
// A linear scale to position the nodes on the X axis
var x: any = d3.scalePoint().range([0, width]).domain(allNodes);
// Add the circle for the nodes
svg
.selectAll("mynodes")
.data(data.nodes)
.enter()
.append("circle")
.attr("cx", (d: any) => x(d.name))
.attr("cy", height - 30)
.attr("r", 8)
.style("fill", "#69b3a2");
// And give them a label
svg
.selectAll("mylabels")
.data(data.nodes)
.enter()
.append("text")
.attr("x", (d: any) => x(d.name))
.attr("y", height - 5)
.text((d: any) => d.name)
.style("text-anchor", "middle")
.attr("fill", "#fff");
var idToNode: any = {};
data.nodes.forEach((node: any) => (idToNode[node.id] = node));
svg
.selectAll("mylinks")
.data(data.links)
.enter()
.append("path")
.attr("d", function (d: any) {
let start = x(idToNode[d.source].name); // X position of start node on the X axis
let end = x(idToNode[d.target].name); // X position of end node
return [
"M",
start,
height - 30, // the arc starts at the coordinate x=start, y=height-30 (where the starting node is)
"A", // This means we're gonna build an elliptical arc
(start - end) / 2,
",", // Next 2 lines are the coordinates of the inflexion point. Height of this point is proportional with start - end distance
(start - end) / 2,
0,
0,
",",
start < end ? 1 : 0,
end,
",",
height - 30,
] // We always want the arc on top. So if end is before start, putting 0 here turn the arc upside down.
.join(" ");
})
.style("fill", "none")
.attr("stroke", "#fff");
}, [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;