122 lines
3.7 KiB
JavaScript
122 lines
3.7 KiB
JavaScript
import React, { useState, useEffect } from "react";
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import * as d3 from 'd3';
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function getlength(number) {
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return number.toString().length;
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}
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function drawGraphInner({nodes, links}){
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// Build the d3 graph
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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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let height = 400 - margin.top - margin.bottom;
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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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// List of node ids
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var nodeids = nodes.map(function(d){return d.id})
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var positionById = {}
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nodeids.forEach((nodeid, i) => positionById[nodeid]=i)
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// A linear scale to position the nodes on the X axis
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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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// 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(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(positionById[d.source])
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// X position of start node on the X axis
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let end = x(positionById[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(positionById[d.source])
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// X position of start node on the X axis
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let end = x(positionById[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){ return(`${d.distance}`)})
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.style("text-anchor", "top")
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}
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export function DrawGraph({isListOrdered, nodes, links}) {
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if(isListOrdered){
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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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} |