Improve label rendering on maps
This commit is contained in:
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map-generator/circle.png
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map-generator/circle.png
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map-generator/circle.svg
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map-generator/circle.svg
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<?xml version="1.0" encoding="UTF-8"?>
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<svg version="1.1" id="circle" xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 15 15">
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<path d="M14,7.5c0,3.5899-2.9101,6.5-6.5,6.5S1,11.0899,1,7.5S3.9101,1,7.5,1S14,3.9101,14,7.5z"/>
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</svg>
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map-generator/dist/main.js
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map-generator/dist/main.js
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@@ -21,166 +21,176 @@ mapboxgl.accessToken = 'pk.eyJ1IjoibWF0dHl3YXkiLCJhIjoiY2x6eG9vMzZyMHY2cDJqb3M1O
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const map = new mapboxgl.Map({
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container: 'map',
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zoom: 10,
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style: 'mapbox://styles/mattyway/clzy2ozzf004k01pn840h9xdb',
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style: 'mapbox://styles/mattyway/cm03vw57q00fd01pn93wf2j7p',
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center: [145.00724,-37.79011]
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});
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fetch("wards_withboundaries.json")
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.then(response => {
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response.json()
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.then((wardData) => {
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const filteredWardData = wardData.filter((ward) => normaliseCouncilName(ward.parentElectorateName) == councilName);
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map.on('load', () => {
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// Load an image from an external URL.
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map.loadImage('circle.png', (error, image) => {
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if (error) throw error;
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var bounds = {
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"west": undefined,
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"south": undefined,
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"east": undefined,
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"north": undefined
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}
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map.addImage('blue-circle', image);
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function addToBounds(coordinate) {
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if (bounds.west == undefined || coordinate[0] < bounds.west) {
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bounds.west = coordinate[0];
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}
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fetch("wards_withboundaries.json")
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.then(response => {
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response.json()
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.then((wardData) => {
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const filteredWardData = wardData.filter((ward) => normaliseCouncilName(ward.parentElectorateName) == councilName);
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if (bounds.south == undefined || coordinate[1] < bounds.south) {
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bounds.south = coordinate[1];
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}
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var bounds = {
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"west": undefined,
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"south": undefined,
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"east": undefined,
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"north": undefined
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}
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if (bounds.east == undefined || coordinate[0] > bounds.east) {
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bounds.east = coordinate[0];
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}
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if (bounds.north == undefined || coordinate[1] > bounds.north) {
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bounds.north = coordinate[1];
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}
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}
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var labelFeatures = [];
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filteredWardData.forEach(wardData => {
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const featureCollection = {
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'type': 'FeatureCollection',
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'features': [
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{
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'type': 'Feature',
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'geometry': JSON.parse(wardData.boundaryJson)
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function addToBounds(coordinate) {
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if (bounds.west == undefined || coordinate[0] < bounds.west) {
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bounds.west = coordinate[0];
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}
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]
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};
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if (featureCollection.features[0].geometry.type == "Polygon") {
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featureCollection.features[0].geometry.coordinates[0].forEach(coordinate => {
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addToBounds(coordinate);
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});
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}
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if (featureCollection.features[0].geometry.type == "MultiPolygon") {
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featureCollection.features[0].geometry.coordinates.forEach(polygon => {
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polygon[0].forEach(coordinate => {
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addToBounds(coordinate);
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if (bounds.south == undefined || coordinate[1] < bounds.south) {
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bounds.south = coordinate[1];
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}
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if (bounds.east == undefined || coordinate[0] > bounds.east) {
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bounds.east = coordinate[0];
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}
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if (bounds.north == undefined || coordinate[1] > bounds.north) {
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bounds.north = coordinate[1];
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}
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}
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var labelFeatures = [];
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filteredWardData.forEach(wardData => {
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const featureCollection = {
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'type': 'FeatureCollection',
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'features': [
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{
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'type': 'Feature',
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'geometry': JSON.parse(wardData.boundaryJson)
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}
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]
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};
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if (featureCollection.features[0].geometry.type == "Polygon") {
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featureCollection.features[0].geometry.coordinates[0].forEach(coordinate => {
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addToBounds(coordinate);
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});
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}
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if (featureCollection.features[0].geometry.type == "MultiPolygon") {
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featureCollection.features[0].geometry.coordinates.forEach(polygon => {
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polygon[0].forEach(coordinate => {
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addToBounds(coordinate);
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});
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});
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}
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// Add data
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map.addSource("data_"+wardData.electorateId, {
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'type': 'geojson',
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'data': featureCollection
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});
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});
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}
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// Add data
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map.addSource("data_"+wardData.electorateId, {
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'type': 'geojson',
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'data': featureCollection
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});
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// Add a line along the data
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map.addLayer({
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'id': "outline_"+wardData.electorateId,
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'type': 'line',
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'source': "data_"+wardData.electorateId,
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'layout': {},
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'paint': {
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'line-color': '#0899fe',
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'line-width': 3
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}
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});
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// Add a line along the data
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map.addLayer({
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'id': "outline_"+wardData.electorateId,
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'type': 'line',
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'source': "data_"+wardData.electorateId,
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'layout': {},
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'paint': {
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'line-color': '#0899fe',
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'line-width': 3
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}
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});
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var centrePoint;
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if (featureCollection.features[0].geometry.type == "Polygon") {
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centrePoint = polylabel(featureCollection.features[0].geometry.coordinates, 0.000001);
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}
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if (featureCollection.features[0].geometry.type == "MultiPolygon") {
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// TODO: Find the biggest polygon in the multipolygon and use that to find the centre point
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// instead of just picking the second polygon.
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//
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// The 2024 set of boundaries only uses 2 MultiPolygon objects (Cathedral in Murrindindi Shire Council and Island in Bass Coast Shire Council)
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// Luckily, the second polygon for both objects results in a good label placement.
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centrePoint = polylabel(featureCollection.features[0].geometry.coordinates[1], 0.000001);
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}
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var centrePoint;
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if (featureCollection.features[0].geometry.type == "Polygon") {
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centrePoint = polylabel(featureCollection.features[0].geometry.coordinates, 0.000001);
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}
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if (featureCollection.features[0].geometry.type == "MultiPolygon") {
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// TODO: Find the biggest polygon in the multipolygon and use that to find the centre point
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// instead of just picking the second polygon.
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//
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// The 2024 set of boundaries only uses 2 MultiPolygon objects (Cathedral in Murrindindi Shire Council and Island in Bass Coast Shire Council)
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// Luckily, the second polygon for both objects results in a good label placement.
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centrePoint = polylabel(featureCollection.features[0].geometry.coordinates[1], 0.000001);
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}
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if (wardData.electorateName.includes(' ')) {
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// Breaking long names into newlines looks better
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const parts = wardData.electorateName.split(' ');
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// Special case if a ward starts with "St" (like "St Albans East")
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// Join the first two parts
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if (parts[0] == "St") {
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parts[0] = parts[0] + ' ' + parts[1];
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parts.splice(1, 1);
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}
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const wardNameNewLines = parts.join('\n');
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labelFeatures.push({
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'type': 'Feature',
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'properties': {
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'description': wardNameNewLines
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},
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'geometry': {
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'type': 'Point',
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'coordinates': centrePoint
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if (wardData.electorateName.includes(' ')) {
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// Breaking long names into newlines looks better
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const parts = wardData.electorateName.split(' ');
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// Special case if a ward starts with "St" (like "St Albans East")
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// Join the first two parts
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if (parts[0] == "St") {
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parts[0] = parts[0] + ' ' + parts[1];
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parts.splice(1, 1);
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}
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const wardNameNewLines = parts.join('\n');
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labelFeatures.push({
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'type': 'Feature',
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'properties': {
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'description': wardNameNewLines
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},
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'geometry': {
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'type': 'Point',
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'coordinates': centrePoint
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}
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});
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} else {
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labelFeatures.push({
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'type': 'Feature',
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'properties': {
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'description': wardData.electorateName
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},
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'geometry': {
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'type': 'Point',
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'coordinates': centrePoint
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}
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});
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}
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});
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} else {
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labelFeatures.push({
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'type': 'Feature',
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'properties': {
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'description': wardData.electorateName
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},
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'geometry': {
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'type': 'Point',
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'coordinates': centrePoint
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map.addSource('labels', {
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'type': 'geojson',
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'data': {
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'type': 'FeatureCollection',
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'features': labelFeatures
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}
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});
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}
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});
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map.addSource('labels', {
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'type': 'geojson',
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'data': {
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'type': 'FeatureCollection',
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'features': labelFeatures
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}
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});
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map.addLayer({
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'id': 'labels',
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'type': 'symbol',
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'source': 'labels',
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'layout': {
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'text-field': ['get', 'description'],
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'text-variable-anchor': ['top', 'left', 'bottom', 'right', 'top-left', 'top-right', 'bottom-left', 'bottom-right'],
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'text-radial-offset': 1,
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'text-padding': 0,
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'text-justify': 'auto',
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'text-allow-overlap': false,
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'text-ignore-placement': false,
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'icon-image': 'blue-circle'
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}
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});
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map.addLayer({
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'id': 'labels',
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'type': 'symbol',
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'source': 'labels',
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'layout': {
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'text-field': ['get', 'description'],
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'text-variable-anchor': ['center', 'top', 'bottom'],
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'text-radial-offset': 0.5,
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'text-padding': 0,
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'text-justify': 'auto',
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'text-allow-overlap': false,
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'text-ignore-placement': false,
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}
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});
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map.fitBounds([
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[bounds.west, bounds.south],
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[bounds.east, bounds.north]
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], {
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padding: 25,
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animate: false
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});
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map.fitBounds([
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[bounds.west, bounds.south],
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[bounds.east, bounds.north]
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], {
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padding: 25,
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animate: false
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});
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}).catch(err => {
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console.log(err);
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}).catch(err => {
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console.log(err);
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});
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});
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});
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});
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});
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