130 lines
2.9 KiB
JavaScript
130 lines
2.9 KiB
JavaScript
import Feature from '../src/ol/Feature.js';
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import Map from '../src/ol/Map.js';
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import View from '../src/ol/View.js';
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import {LineString, Point} from '../src/ol/geom.js';
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import VectorLayer from '../src/ol/layer/Vector.js';
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import VectorSource from '../src/ol/source/Vector.js';
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import {Circle as CircleStyle, Fill, Stroke, Style} from '../src/ol/style.js';
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const count = 20000;
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const features = new Array(count);
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const e = 18000000;
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for (let i = 0; i < count; ++i) {
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features[i] = new Feature({
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'geometry': new Point(
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[2 * e * Math.random() - e, 2 * e * Math.random() - e]),
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'i': i,
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'size': i % 2 ? 10 : 20
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});
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}
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const styles = {
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'10': new Style({
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image: new CircleStyle({
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radius: 5,
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fill: new Fill({color: '#666666'}),
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stroke: new Stroke({color: '#bada55', width: 1})
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})
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}),
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'20': new Style({
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image: new CircleStyle({
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radius: 10,
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fill: new Fill({color: '#666666'}),
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stroke: new Stroke({color: '#bada55', width: 1})
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})
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})
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};
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const vectorSource = new VectorSource({
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features: features,
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wrapX: false
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});
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const vector = new VectorLayer({
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source: vectorSource,
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style: function(feature) {
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return styles[feature.get('size')];
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}
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});
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const map = new Map({
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layers: [vector],
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target: document.getElementById('map'),
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view: new View({
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center: [0, 0],
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zoom: 2
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})
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});
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let point = null;
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let line = null;
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const displaySnap = function(coordinate) {
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const closestFeature = vectorSource.getClosestFeatureToCoordinate(coordinate);
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if (closestFeature === null) {
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point = null;
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line = null;
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} else {
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const geometry = closestFeature.getGeometry();
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const closestPoint = geometry.getClosestPoint(coordinate);
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if (point === null) {
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point = new Point(closestPoint);
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} else {
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point.setCoordinates(closestPoint);
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}
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if (line === null) {
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line = new LineString([coordinate, closestPoint]);
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} else {
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line.setCoordinates([coordinate, closestPoint]);
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}
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}
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map.render();
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};
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map.on('pointermove', function(evt) {
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if (evt.dragging) {
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return;
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}
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const coordinate = map.getEventCoordinate(evt.originalEvent);
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displaySnap(coordinate);
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});
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map.on('click', function(evt) {
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displaySnap(evt.coordinate);
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});
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const stroke = new Stroke({
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color: 'rgba(255,255,0,0.9)',
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width: 3
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});
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const style = new Style({
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stroke: stroke,
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image: new CircleStyle({
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radius: 10,
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stroke: stroke
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})
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});
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map.on('postcompose', function(evt) {
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const vectorContext = evt.vectorContext;
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vectorContext.setStyle(style);
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if (point !== null) {
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vectorContext.drawGeometry(point);
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}
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if (line !== null) {
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vectorContext.drawGeometry(line);
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}
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});
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map.on('pointermove', function(evt) {
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if (evt.dragging) {
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return;
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}
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const pixel = map.getEventPixel(evt.originalEvent);
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const hit = map.hasFeatureAtPixel(pixel);
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if (hit) {
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map.getTarget().style.cursor = 'pointer';
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} else {
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map.getTarget().style.cursor = '';
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}
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});
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