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migrations-map/src/Maps.js /
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| import React, { Component } from 'react'; | |
| import * as d3 from 'd3'; | |
| import * as topojson from 'topojson-client'; | |
| import _ from 'lodash'; | |
| function migrationSources(data, centroids, nameIdMap) { | |
| return Object.keys(data.sources) | |
| .filter(name => centroids[nameIdMap[name]]) | |
| .filter(name => data.sources[name] !== 0) | |
| } | |
| const Map = ({ topology, projection, data, nameIdMap, focusCountry }) => { | |
| const D = d3.geoPath(projection), | |
| countries = topojson.feature(topology, topology.objects.countries), | |
| centroids = _.fromPairs(countries.features | |
| .map(country => [country.id, | |
| D.centroid(country)])), | |
| idNameMap = _.invert(nameIdMap); | |
| let sources = [], | |
| focusData = data.find(({ id }) => id === focusCountry), | |
| colorScale = _.noop; | |
| if (focusData) { | |
| console.log(focusData); | |
| sources = migrationSources(focusData, | |
| centroids, nameIdMap); | |
| colorScale = d3.scaleLog() | |
| .domain(d3.extent(sources.map(name => focusData.sources[name]))) | |
| .range([0, 1]); | |
| } | |
| const isSource = (country) => sources.includes(idNameMap[country.id]), | |
| color = (country) => { | |
| if (isSource(country) && focusData){ | |
| return d3.interpolateWarm(colorScale( | |
| focusData.sources[idNameMap[country.id]] | |
| )); | |
| }else{ | |
| return 'grey'; | |
| } | |
| }; | |
| return ( | |
| <g> | |
| {countries.features.map((country, i) => ( | |
| <path d={D(country)} | |
| key={`${country.id}-${i}`} | |
| style={{stroke: 'white', | |
| strokeWidth: '0.25px', | |
| fillOpacity: isSource(country) ? 1 : 0.5, | |
| fill: color(country)}} /> | |
| ))} | |
| </g> | |
| ); | |
| }; | |
| const Curve = ({ start, end, color }) => { | |
| const line = d3.line() | |
| .curve(d3.curveBasis), | |
| [x1, y1] = start, | |
| [x2, y2] = end, | |
| middle = [(x1 + x2)/2, (y1 + y2)/2-200]; | |
| return ( | |
| <path d={line([start, middle, end])} | |
| style={{stroke: color, | |
| strokeWidth: '1.6px', | |
| strokeOpacity: '0.7', | |
| fillOpacity: 0}} /> | |
| ); | |
| }; | |
| const CountryMigrations = ({ data, nameIdMap, centroids }) => { | |
| const destination = centroids[data.id]; | |
| const sources = migrationSources(data, centroids, nameIdMap), | |
| color = d3.scaleLog() | |
| .domain(d3.extent(sources.map(name => data.sources[name]))) | |
| .range([0, 1]); | |
| console.log(d3.extent(sources.map(name => data.sources[name]))); | |
| return ( | |
| <g> | |
| {sources.map((name, i) => ( | |
| <Curve start={centroids[nameIdMap[name]]} end={destination} | |
| color={d3.interpolateWarm(color(data.sources[name]))} | |
| key={`${data.id}-${i}`} /> | |
| ))} | |
| </g> | |
| ) | |
| }; | |
| const Migrations = ({ topology, projection, data, nameIdMap, focusCountry }) => { | |
| if (!data) { | |
| return null; | |
| } | |
| const countries = topojson.feature(topology, topology.objects.countries), | |
| path = d3.geoPath(projection), | |
| centroids = _.fromPairs(countries.features | |
| .map(country => [country.id, | |
| path.centroid(country)])); | |
| const dataToDraw = data.filter(({ id }) => id === focusCountry) | |
| .filter(({ id }) => !!centroids[id]); | |
| return ( | |
| <g> | |
| {dataToDraw.map(data => ( | |
| <CountryMigrations data={data} nameIdMap={nameIdMap} | |
| centroids={centroids} | |
| key={`migrations-${data.id}`} /> | |
| ))} | |
| </g> | |
| ); | |
| }; | |
| class World extends Component { | |
| state = { | |
| topology: null | |
| } | |
| projection = d3.geoEquirectangular() | |
| .center([-50, 40]) | |
| .scale(200) | |
| componentWillMount() { | |
| d3.json('data/world-110m.v1.json', | |
| (err, topology) => { | |
| this.setState({ | |
| topology: topology | |
| }); | |
| }); | |
| } | |
| render() { | |
| const { width, height } = this.props, | |
| { topology } = this.state; | |
| if (!topology) { | |
| return null; | |
| } | |
| return ( | |
| <svg width={width} height={height}> | |
| <Map topology={topology} projection={this.projection} data={this.props.data} | |
| nameIdMap={this.props.nameIdMap} focusCountry={this.props.focusCountry} /> | |
| <Migrations topology={topology} projection={this.projection} | |
| data={this.props.data} nameIdMap={this.props.nameIdMap} | |
| focusCountry={this.props.focusCountry} /> | |
| </svg> | |
| ) | |
| } | |
| } | |
| export { World }; |