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| import Map from 'ol/Map.js';
import TopoJSON from 'ol/format/TopoJSON.js';
import VectorTileLayer from 'ol/layer/VectorTile.js';
import VectorTileSource from 'ol/source/VectorTile.js';
import View from 'ol/View.js';
import {Fill, Stroke, Style} from 'ol/style.js';
import {fromLonLat} from 'ol/proj.js';
const key = 'Your Nextzen API key from https://developers.nextzen.org/';
const roadStyleCache = {};
const roadColor = {
'major_road': '#776',
'minor_road': '#ccb',
'highway': '#f39',
};
const buildingStyle = new Style({
fill: new Fill({
color: '#666',
opacity: 0.4,
}),
stroke: new Stroke({
color: '#444',
width: 1,
}),
});
const waterStyle = new Style({
fill: new Fill({
color: '#9db9e8',
}),
});
const roadStyle = function (feature) {
const kind = feature.get('kind');
const railway = feature.get('railway');
const sort_key = feature.get('sort_key');
const styleKey = kind + '/' + railway + '/' + sort_key;
let style = roadStyleCache[styleKey];
if (!style) {
let color, width;
if (railway) {
color = '#7de';
width = 1;
} else {
color = roadColor[kind];
width = kind == 'highway' ? 1.5 : 1;
}
style = new Style({
stroke: new Stroke({
color: color,
width: width,
}),
zIndex: sort_key,
});
roadStyleCache[styleKey] = style;
}
return style;
};
const map = new Map({
layers: [
new VectorTileLayer({
source: new VectorTileSource({
attributions:
'© OpenStreetMap contributors, Who’s On First, ' +
'Natural Earth, and osmdata.openstreetmap.de',
format: new TopoJSON({
layerName: 'layer',
layers: ['water', 'roads', 'buildings'],
}),
maxZoom: 19,
url:
'https://tile.nextzen.org/tilezen/vector/v1/all/{z}/{x}/{y}.topojson?api_key=' +
key,
}),
style: function (feature, resolution) {
switch (feature.get('layer')) {
case 'water':
return waterStyle;
case 'roads':
return roadStyle(feature);
case 'buildings':
return resolution < 10 ? buildingStyle : null;
default:
return null;
}
},
}),
],
target: 'map',
view: new View({
center: fromLonLat([-74.0064, 40.7142]),
maxZoom: 19,
zoom: 15,
}),
});
|
)
