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Split Polylines Based on Distance in Leaflet Maps

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This commit is contained in:
Eugene Burmakin 2024-05-29 23:00:35 +02:00
parent 2d78fe4d6c
commit de3339ae22
2 changed files with 52 additions and 12 deletions
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2
.app_version
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@ -1 +1 @@
0.4.1
0.4.2

62
app/javascript/controllers/maps_controller.js
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@ -16,26 +16,66 @@ export default class extends Controller {
layers: [this.osmMapLayer(), this.osmHotMapLayer()]
}).setView([center[0], center[1]], 14);
var markersArray = this.markersArray(markers)
var markersLayer = L.layerGroup(markersArray)
var hearmapMarkers = markers.map(element => [element[0], element[1], 0.6]); // lat, lon, intensity
var markersArray = this.markersArray(markers);
var markersLayer = L.layerGroup(markersArray);
var heatmapMarkers = markers.map(element => [element[0], element[1], 0.3]); // lat, lon, intensity
var polylineCoordinates = markers.map(element => element.slice(0, 2));
var polylineLayer = L.polyline(polylineCoordinates, { color: 'blue', opacity: 0.6, weight: 3 })
var heatmapLayer = L.heatLayer(hearmapMarkers, {radius: 25}).addTo(map);
// Function to calculate distance between two lat-lng points using Haversine formula
function haversineDistance(lat1, lon1, lat2, lon2) {
const toRad = x => x * Math.PI / 180;
const R = 6371; // Radius of the Earth in kilometers
const dLat = toRad(lat2 - lat1);
const dLon = toRad(lon2 - lon1);
const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) *
Math.sin(dLon / 2) * Math.sin(dLon / 2);
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
return R * c * 1000; // Distance in meters
}
var splitPolylines = [];
var currentPolyline = [];
// Process markers and split polylines based on the distance
for (let i = 0, len = markers.length; i < len; i++) {
if (currentPolyline.length === 0) {
currentPolyline.push(markers[i].slice(0, 2));
} else {
var lastPoint = currentPolyline[currentPolyline.length - 1];
var currentPoint = markers[i].slice(0, 2);
var distance = haversineDistance(lastPoint[0], lastPoint[1], currentPoint[0], currentPoint[1]);
if (distance > 500) {
splitPolylines.push([...currentPolyline]); // Use spread operator to clone the array
currentPolyline = [currentPoint];
} else {
currentPolyline.push(currentPoint);
}
}
}
// Add the last polyline if it exists
if (currentPolyline.length > 0) {
splitPolylines.push(currentPolyline);
}
// Batch adding polylines to the map
var polylineLayers = splitPolylines.map(polylineCoordinates =>
L.polyline(polylineCoordinates, { color: 'blue', opacity: 0.6, weight: 3 })
);
var polylinesLayer = L.layerGroup(polylineLayers).addTo(map);
var heatmapLayer = L.heatLayer(heatmapMarkers, { radius: 20 }).addTo(map);
var controlsLayer = {
"Points": markersLayer,
"Polyline": polylineLayer,
"Polylines": L.layerGroup(polylinesLayer),
"Heatmap": heatmapLayer
}
var layerControl = L.control.layers(this.baseMaps(), controlsLayer).addTo(map);
};
L.control.layers(this.baseMaps(), controlsLayer).addTo(map);
this.addTileLayer(map);
// markersLayer.addTo(map);
polylineLayer.addTo(map);
this.addLastMarker(map, markers);
}