I am working on a map with Mapbox and Leaflet and I am supposed to let the user draw polygons and calculate and show the are of that polygon and I also need to let the user draw a polyline and show the distance of the polyline.
I have figured out the polygon area feature but I cannot figure out how to calculate the distance of a polyline.
My code is as follows:
loadScript('https://api.tiles.mapbox.com/mapbox.js/plugins/leaflet-draw/v0.2.2/leaflet.draw.js', function(){
loadScript('https://api.tiles.mapbox.com/mapbox.js/plugins/leaflet-geodesy/v0.1.0/leaflet-geodesy.js', function(){
var featureGroup = L.featureGroup().addTo(map);
var drawControl = new L.Control.Draw({
edit: {
featureGroup: featureGroup
},
draw: {
polygon: true,
polyline: true,
rectangle: false,
circle: false,
marker: false
}
}).addTo(map);
map.on('draw:created', showPolygonArea);
map.on('draw:edited', showPolygonAreaEdited);
function showPolygonAreaEdited(e) {
e.layers.eachLayer(function(layer) {
showPolygonArea({ layer: layer });
});
}
function showPolygonArea(e) {
var type = e.layerType,
layer = e.layer;
if (type === 'polygon') {
featureGroup.clearLayers();
featureGroup.addLayer(e.layer);
e.layer.bindPopup(((LGeo.area(e.layer) / 1000000) * 0.62137).toFixed(2) + ' mi<sup>2</sup>');
e.layer.openPopup();
}
if (type === 'polyline') {
featureGroup.clearLayers();
featureGroup.addLayer(e.layer);
// What do I do different here to calculate the distance of the polyline?
// Is there a method in the LGeo lib itself?
// e.layer.bindPopup(((LGeo.area(e.layer) / 1000000) * 0.62137).toFixed(2) + ' mi<sup>2</sup>');
e.layer.openPopup();
}
}
});
});
Is there a method in the LGeo lib itself which will help me calculate the distance of the polyline? The devs at geogson.io also have a way to calculate the distance but I cannot seem to figure it out looking at their code. I am not a seasoned Javascript developer. Any help is welcome. :)