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