OpenLayers
OpenLayers
Example for testing feature modification.
Example for testing feature modification.
import GeoJSON from 'ol/format/GeoJSON.js';
import Map from 'ol/Map.js';
import VectorLayer from 'ol/layer/Vector.js';
import VectorSource from 'ol/source/Vector.js';
import View from 'ol/View.js';
import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';
import {
Modify,
Select,
defaults as defaultInteractions,
} from 'ol/interaction.js';
const styleFunction = (function () {
const styles = {};
const image = new CircleStyle({
radius: 5,
fill: null,
stroke: new Stroke({color: 'orange', width: 2}),
});
styles['Point'] = new Style({image: image});
styles['Polygon'] = new Style({
stroke: new Stroke({
color: 'blue',
width: 3,
}),
fill: new Fill({
color: 'rgba(0, 0, 255, 0.1)',
}),
});
styles['MultiLineString'] = new Style({
stroke: new Stroke({
color: 'green',
width: 3,
}),
});
styles['MultiPolygon'] = new Style({
stroke: new Stroke({
color: 'yellow',
width: 1,
}),
fill: new Fill({
color: 'rgba(255, 255, 0, 0.1)',
}),
});
styles['default'] = new Style({
stroke: new Stroke({
color: 'red',
width: 3,
}),
fill: new Fill({
color: 'rgba(255, 0, 0, 0.1)',
}),
image: image,
});
return function (feature) {
return styles[feature.getGeometry().getType()] || styles['default'];
};
})();
const geojsonObject = {
'type': 'FeatureCollection',
'crs': {
'type': 'name',
'properties': {
'name': 'EPSG:3857',
},
},
'features': [
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [0, 0],
},
},
{
'type': 'Feature',
'geometry': {
'type': 'MultiPoint',
'coordinates': [
[-2e6, 0],
[0, -2e6],
],
},
},
{
'type': 'Feature',
'geometry': {
'type': 'LineString',
'coordinates': [
[4e6, -2e6],
[8e6, 2e6],
[9e6, 2e6],
],
},
},
{
'type': 'Feature',
'geometry': {
'type': 'LineString',
'coordinates': [
[4e6, -2e6],
[8e6, 2e6],
[8e6, 3e6],
],
},
},
{
'type': 'Feature',
'geometry': {
'type': 'Polygon',
'coordinates': [
[
[-5e6, -1e6],
[-4e6, 1e6],
[-3e6, -1e6],
[-5e6, -1e6],
],
[
[-4.5e6, -0.5e6],
[-3.5e6, -0.5e6],
[-4e6, 0.5e6],
[-4.5e6, -0.5e6],
],
],
},
},
{
'type': 'Feature',
'geometry': {
'type': 'MultiLineString',
'coordinates': [
[
[-1e6, -7.5e5],
[-1e6, 7.5e5],
],
[
[-1e6, -7.5e5],
[-1e6, 7.5e5],
[-5e5, 0],
[-1e6, -7.5e5],
],
[
[1e6, -7.5e5],
[15e5, 0],
[15e5, 0],
[1e6, 7.5e5],
],
[
[-7.5e5, -1e6],
[7.5e5, -1e6],
],
[
[-7.5e5, 1e6],
[7.5e5, 1e6],
],
],
},
},
{
'type': 'Feature',
'geometry': {
'type': 'MultiPolygon',
'coordinates': [
[
[
[-5e6, 6e6],
[-5e6, 8e6],
[-3e6, 8e6],
[-3e6, 6e6],
[-5e6, 6e6],
],
],
[
[
[-3e6, 6e6],
[-2e6, 8e6],
[0, 8e6],
[0, 6e6],
[-3e6, 6e6],
],
],
[
[
[1e6, 6e6],
[1e6, 8e6],
[3e6, 8e6],
[3e6, 6e6],
[1e6, 6e6],
],
],
],
},
},
{
'type': 'Feature',
'geometry': {
'type': 'GeometryCollection',
'geometries': [
{
'type': 'LineString',
'coordinates': [
[-5e6, -5e6],
[0, -5e6],
],
},
{
'type': 'Point',
'coordinates': [4e6, -5e6],
},
{
'type': 'Polygon',
'coordinates': [
[
[1e6, -5e6],
[2e6, -3.5e6],
[3e6, -5e6],
[1e6, -5e6],
],
],
},
{
'type': 'Polygon',
'coordinates': [
[
[1e6, -5e6],
[2e6, -6.5e6],
[3e6, -5e6],
[1e6, -5e6],
],
],
},
],
},
},
],
};
const source = new VectorSource({
features: new GeoJSON().readFeatures(geojsonObject),
});
const layer = new VectorLayer({
source: source,
style: styleFunction,
});
const overlayStyle = (function () {
const styles = {};
styles['Polygon'] = [
new Style({
fill: new Fill({
color: [255, 255, 255, 0.5],
}),
}),
new Style({
stroke: new Stroke({
color: [255, 255, 255, 1],
width: 5,
}),
}),
new Style({
stroke: new Stroke({
color: [0, 153, 255, 1],
width: 3,
}),
}),
];
styles['MultiPolygon'] = styles['Polygon'];
styles['LineString'] = [
new Style({
stroke: new Stroke({
color: [255, 255, 255, 1],
width: 5,
}),
}),
new Style({
stroke: new Stroke({
color: [0, 153, 255, 1],
width: 3,
}),
}),
];
styles['MultiLineString'] = styles['LineString'];
styles['Point'] = [
new Style({
image: new CircleStyle({
radius: 7,
fill: new Fill({
color: [0, 153, 255, 1],
}),
stroke: new Stroke({
color: [255, 255, 255, 0.75],
width: 1.5,
}),
}),
zIndex: 100000,
}),
];
styles['MultiPoint'] = styles['Point'];
styles['GeometryCollection'] = styles['Polygon'].concat(styles['Point']);
return function (feature) {
return styles[feature.getGeometry().getType()];
};
})();
const select = new Select({
style: overlayStyle,
});
const modify = new Modify({
features: select.getFeatures(),
style: overlayStyle,
insertVertexCondition: function () {
// prevent new vertices to be added to the polygons
return !select
.getFeatures()
.getArray()
.every(function (feature) {
return /Polygon/.test(feature.getGeometry().getType());
});
},
});
const map = new Map({
interactions: defaultInteractions().extend([select, modify]),
layers: [layer],
target: 'map',
view: new View({
center: [0, 1000000],
zoom: 2,
multiWorld: true,
}),
});
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Modify Features Test</title>
<link rel="stylesheet" href="node_modules/ol/ol.css">
<style>
.map {
width: 100%;
height: 400px;
}
.map {
background: grey;
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<script type="module" src="main.js"></script>
</body>
</html>{
"name": "modify-test",
"dependencies": {
"ol": "10.3.1"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}