55 lines
1.4 KiB
JavaScript
55 lines
1.4 KiB
JavaScript
import React, { useEffect, useRef, useState } from 'react'
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import L from 'leaflet'
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import "leaflet/dist/leaflet.css";
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export default function MapCircleFixed() {
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const mapRef = useRef();
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useEffect(() => {
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const map = L.map(
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mapRef.current,
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{attributionControl: true}
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).setView( [42.69751, 23.32415], 16 );
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//add layer
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L.tileLayer(
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"http://{s}.tile.osm.org/{z}/{x}/{y}.png",
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{
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attribution: '© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors',
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maxZoom: 18,
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scrollWheelZoom: false,
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}).addTo(map);
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//add circle marker
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var circle = L.circleMarker(map.getCenter(), {
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radius: 50,
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color: 'red',
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fillOpacity: 0.2,
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}).addTo(map);
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map.on('move', function(e){
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circle.setLatLng(map.getCenter());
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map._renderer._update();
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});
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// unmount map function
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//You should unmount the function in react.js to remove the existing map.
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return () => map.remove();
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}, []);
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return (
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<>
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<p>MapCircleFixed</p>
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<div
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style={{padding: 0, margin: 0, width: "75%", height: "23vh",}}
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ref={el => mapRef.current = el}>
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</div>
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</>
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);
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};
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//https://jsfiddle.net/falkedesign/q2mdow5c/
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//https://github.com/azaharyan/react-leaflet-example
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//https://stackoverflow.com/questions/61159376/how-to-draw-a-circle-that-stays-in-the-center-of-a-leaflet-js-map
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