140 lines
4.4 KiB
JavaScript
140 lines
4.4 KiB
JavaScript
import React, { useState, useEffect } from "react";
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import * as d3 from 'd3';
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import { toLocale, truncateValueForDisplay, numToAlphabeticalString } from "../lib/utils.js"
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let getlength = (number) => number.toString().length;
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export function removeOldSvg() {
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d3.select("#graph").select("svg").remove();
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}
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function drawGraphInner({ nodes, links }) {
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// List of node ids for convenience
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var nodeids = nodes.map(node => node.id)
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var positionById = {}
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nodeids.forEach((nodeid, i) => positionById[nodeid] = i)
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console.log("NodeIds/positionById")
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console.log(nodeids)
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console.log(positionById)
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// Calculate the dimensions
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let margin = { top: 0, right: 30, bottom: 20, left: 30 };
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let width = 900 - margin.left - margin.right;
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var x = d3.scalePoint()
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.range([0, width])
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.domain(nodeids)
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let heights = links.map(link => {
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let start = x(positionById[link.source])
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let end = x(positionById[link.target])
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return Math.abs(start - end) / 2 + 70 // Magic constant.
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})
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console.log(heights)
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let maxheight = Math.max(...heights)
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let height = maxheight - margin.top - margin.bottom;
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console.log(`height: ${height}`)
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// Build the d3 graph
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removeOldSvg()
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var svg = d3.select("#graph")
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.append("svg")
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.attr("width", width + margin.left + margin.right)
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.attr("height", height + margin.top + margin.bottom)
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.append("g")
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
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// A linear scale to position the nodes on the X axis
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// Add the circle for the nodes
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svg
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.selectAll("mynodes")
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.data(nodes)
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.enter()
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.append("circle")
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.attr("cx", function (d) { return (x(d.id)) })
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.attr("cy", height - 30)
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.attr("r", 8)
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.style("fill", "#69b3a2")
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// And give them a label
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svg
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.selectAll("mylabels")
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.data(nodes)
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.enter()
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.append("text")
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.attr("x", function (d) { return (x(d.id)) })
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.attr("y", height - 10)
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.text(function (d) { return numToAlphabeticalString(d.id) })
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.style("text-anchor", "middle")
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// Add the links
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svg
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.selectAll('mylinks')
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.data(links)
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.enter()
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.append('path')
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.attr('d', function (d) {
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let start = x(d.source)
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// X position of start node on the X axis
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let end = x(d.target)
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// X position of end node
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return ['M',
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start,
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height - 30,
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// the arc starts at the coordinate x=start, y=height-30 (where the starting node is)
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'A',
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// This means we're gonna build an elliptical arc
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(start - end) / 2, ',',
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// Next 2 lines are the coordinates of the inflexion point. Height of this point is proportional with start - end distance
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(start - end) / 2, 0, 0, ',',
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start < end ? 1 : 0, end, ',', height - 30]
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// We always want the arc on top. So if end is before start, putting 0 here turn the arc upside down.
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.join(' ');
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})
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.style("fill", "none")
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.attr("stroke", "black")
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// labels for links
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svg
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.selectAll('mylinks')
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.data(links)
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.enter()
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.append("text")
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.attr("x", function (d) {
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let start = x(d.source)
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// X position of start node on the X axis
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let end = x(d.target)
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// X position of end node
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return start + (end - start) / 2 //-4*getlength(d.distance)
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})
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.attr("y", function (d) {
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let start = x(d.source)
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// X position of start node on the X axis
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let end = x(d.target)
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// X position of end node
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return height - 32 - (Math.abs(start - end) / 2)//height-30
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})
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.text(function (d) {
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return Number(d.distance)
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return (truncateValueForDisplay(Number(d.distance)))
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//return(Number(d.distance).toPrecision(2).toString())
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})
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.style("text-anchor", "middle")
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}
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export function DrawGraph({ isListOrdered, orderedList, listOfElements, links }) {
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if (isListOrdered) {
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let nodes = orderedList.map(i => listOfElements[i])
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drawGraphInner({ nodes, links });
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}
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return (
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<div>
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<div id="graph">
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</div>
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</div>
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);
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} |