2021-08-25 08:15:16 +00:00
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<!DOCTYPE html>
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<html style="height:100%;margin:0;padding:0;">
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<head>
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<title>Tests edit line - polygon</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" />
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<script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script>
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<script src="./leaflet/leaflet-hash.js"></script>
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<style type="text/css">
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.leaflet-tile-container { pointer-events: auto; }
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</style>
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</head>
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<body style="height:100%;margin:0;padding:0;">
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<div id="map" style="height:100%"></div>
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<script>
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const map = L.map('map').setView([50.5, 5.57], 10);
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const cyclosm = L.tileLayer('https://{s}.tiles.champs-libres.be/cyclosm/{z}/{x}/{y}.png', {
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subdomains: "abc",
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attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
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maxZoom: 20
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});
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map.addLayer(cyclosm);
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const hash = L.hash(map);
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2021-09-01 13:14:04 +00:00
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let geometryType = 'POLYGON'; //'POINT' | 'LINESTRING' | 'POLYGON'
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2021-08-25 08:15:16 +00:00
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let myMarker = null;
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let polyline = null;
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let previousPolyline = null;
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let previousLayerPoint = null;
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2021-09-01 13:14:04 +00:00
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let polygon = null;
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let firstPolygonPoint = null;
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2021-08-25 08:15:16 +00:00
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const lineDraw = L.polyline([], {color: '#11aa9e', dashArray: '6', lineCap: 'butt'}).addTo(map);
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const pointDistance = (pointA, pointB) => {
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const SNAP_DISTANCE = 6;
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let distancePixel = Math.sqrt(Math.abs((pointB.x - pointA.x)**2 - (pointB.y - pointA.y)**2));
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return distancePixel < SNAP_DISTANCE;
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};
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const arePointsSnapped = (previousPoint, currentPoint) =>
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(previousPoint && currentPoint) ? pointDistance(previousPoint, currentPoint) : false;
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switch(geometryType){
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case 'LINESTRING':
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map.on('mousemove', (e) => {
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if(polyline){
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let lastDrawPoint = polyline.getLatLngs()[polyline.getLatLngs().length - 1];
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lineDraw.setLatLngs([lastDrawPoint, e.latlng]);
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}
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});
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break;
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2021-09-01 13:14:04 +00:00
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case 'POLYGON':
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map.on('mousemove', (e) => {
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if(polygon){
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let lastDrawPoint = polygon.getLatLngs()[0][polygon.getLatLngs()[0].length - 1];
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let firstDrawPoint = polygon.getLatLngs()[0][0];
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lineDraw.setLatLngs([firstDrawPoint, e.latlng, lastDrawPoint]);
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}
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});
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break;
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2021-08-25 08:15:16 +00:00
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}
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map.on('click', (e) => {
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console.log(e);
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switch(geometryType){
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case 'POINT':
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default:
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if (myMarker !== null) {
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map.removeLayer(myMarker);
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}
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myMarker = L.marker(e.latlng).addTo(map);
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2021-09-01 13:14:04 +00:00
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break;
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2021-08-25 08:15:16 +00:00
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case 'LINESTRING':
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lineDraw.setLatLngs([]);
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if (polyline === null){
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console.log(previousPolyline)
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if (previousPolyline !== null){
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map.removeLayer(previousPolyline);
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}
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polyline = L.polyline([e.latlng], {color: '#11aa9e'}).addTo(map);
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} else {
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if (arePointsSnapped(previousLayerPoint, e.layerPoint)) {
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console.log('reset line')
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previousPolyline = polyline;
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polyline.setStyle({color: '#60b15c'});
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polyline = null;
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} else {
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polyline.addLatLng(e.latlng);
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previousLayerPoint = e.layerPoint;
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}
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}
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2021-09-01 13:14:04 +00:00
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break;
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case 'POLYGON':
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lineDraw.setLatLngs([]);
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if (polygon === null){
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polygon = L.polygon([e.latlng], {color: '#11aa9e'}).addTo(map);
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firstPolygonPoint = e.layerPoint;
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} else {
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if (arePointsSnapped(firstPolygonPoint, e.layerPoint)) {
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console.log('close the polygon')
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polygon.setStyle({color: '#60b15c'});
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polygon = null;
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} else {
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polygon.addLatLng(e.latlng);
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}
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}
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break;
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2021-08-25 08:15:16 +00:00
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}
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});
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</script>
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</body>
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</html>
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