97 lines
2.3 KiB
JavaScript
97 lines
2.3 KiB
JavaScript
import Map from '../src/ol/Map.js';
|
|
import View from '../src/ol/View.js';
|
|
import GeoJSON from '../src/ol/format/GeoJSON.js';
|
|
import MultiPoint from '../src/ol/geom/MultiPoint.js';
|
|
import VectorLayer from '../src/ol/layer/Vector.js';
|
|
import VectorSource from '../src/ol/source/Vector.js';
|
|
import {Circle as CircleStyle, Fill, Stroke, Style} from '../src/ol/style.js';
|
|
|
|
const styles = [
|
|
/* We are using two different styles for the polygons:
|
|
* - The first style is for the polygons themselves.
|
|
* - The second style is to draw the vertices of the polygons.
|
|
* In a custom `geometry` function the vertices of a polygon are
|
|
* returned as `MultiPoint` geometry, which will be used to render
|
|
* the style.
|
|
*/
|
|
new Style({
|
|
stroke: new Stroke({
|
|
color: 'blue',
|
|
width: 3
|
|
}),
|
|
fill: new Fill({
|
|
color: 'rgba(0, 0, 255, 0.1)'
|
|
})
|
|
}),
|
|
new Style({
|
|
image: new CircleStyle({
|
|
radius: 5,
|
|
fill: new Fill({
|
|
color: 'orange'
|
|
})
|
|
}),
|
|
geometry: function(feature) {
|
|
// return the coordinates of the first ring of the polygon
|
|
const coordinates = feature.getGeometry().getCoordinates()[0];
|
|
return new MultiPoint(coordinates);
|
|
}
|
|
})
|
|
];
|
|
|
|
const geojsonObject = {
|
|
'type': 'FeatureCollection',
|
|
'crs': {
|
|
'type': 'name',
|
|
'properties': {
|
|
'name': 'EPSG:3857'
|
|
}
|
|
},
|
|
'features': [{
|
|
'type': 'Feature',
|
|
'geometry': {
|
|
'type': 'Polygon',
|
|
'coordinates': [[[-5e6, 6e6], [-5e6, 8e6], [-3e6, 8e6],
|
|
[-3e6, 6e6], [-5e6, 6e6]]]
|
|
}
|
|
}, {
|
|
'type': 'Feature',
|
|
'geometry': {
|
|
'type': 'Polygon',
|
|
'coordinates': [[[-2e6, 6e6], [-2e6, 8e6], [0, 8e6],
|
|
[0, 6e6], [-2e6, 6e6]]]
|
|
}
|
|
}, {
|
|
'type': 'Feature',
|
|
'geometry': {
|
|
'type': 'Polygon',
|
|
'coordinates': [[[1e6, 6e6], [1e6, 8e6], [3e6, 8e6],
|
|
[3e6, 6e6], [1e6, 6e6]]]
|
|
}
|
|
}, {
|
|
'type': 'Feature',
|
|
'geometry': {
|
|
'type': 'Polygon',
|
|
'coordinates': [[[-2e6, -1e6], [-1e6, 1e6],
|
|
[0, -1e6], [-2e6, -1e6]]]
|
|
}
|
|
}]
|
|
};
|
|
|
|
const source = new VectorSource({
|
|
features: (new GeoJSON()).readFeatures(geojsonObject)
|
|
});
|
|
|
|
const layer = new VectorLayer({
|
|
source: source,
|
|
style: styles
|
|
});
|
|
|
|
const map = new Map({
|
|
layers: [layer],
|
|
target: 'map',
|
|
view: new View({
|
|
center: [0, 3000000],
|
|
zoom: 2
|
|
})
|
|
});
|