makinacorpus/Leaflet.LayerIndex

Name: Leaflet.LayerIndex

Owner: Makina Corpus

Description: Spatial index of layer objects using RTree.js

Created: 2013-03-07 11:42:57.0

Updated: 2017-12-03 16:11:28.0

Pushed: 2017-12-06 13:27:38.0

Homepage: http://makinacorpus.github.io/Leaflet.LayerIndex/

Size: 20

Language: JavaScript

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README

Leaflet.LayerIndex

Efficient spatial index for Leaflet layers. It works recursively for L.FeatureGroup objects.

Requires the Magnificient RTree.js

Check out the live demo

Usage

On L.Map objects

L.Map.include(L.LayerIndexMixin);

var map = L.map(...);
...
var layer = L.GeoJSON(data).addTo(map);
map.indexLayer(layer);

// Search visible features for example
map.on('moveend', function () {
    var shown = map.search(map.getBounds());
    console.log(shown.length + ' objects shown.');
});

// remove the spatial index when the layer is unused
map.unindexLayer(layer);

map.unindexLayer() function accepts an options object as an optional second parameter to define the bounds to be removed from the index. It should have one of the following attributes:

• options.bounds - a leaflet latLngBounds object
• options.latlng - a leaflet latLng object
• options.latlngs - an array of leaflet latLng objects

If no option is provided, the function will use the bounds of the layer's geometry.

Using inherited class

L.IndexedGeoJSON = L.GeoJSON.extend({
    includes: L.LayerIndexMixin,

    initialize: function (geojson, options) {
        // Decorate onEachFeature to index layers
        var onEachFeature = function (geojson, layer) {
            this.indexLayer(layer);
            if (this._onEachFeature) this._onEachFeature(geojson, layer);
        };
        this._onEachFeature = options.onEachFeature;
        options.onEachFeature = L.Util.bind(onFeatureParse, this);

        // Parent initialization
        L.GeoJSON.prototype.initialize.call(this, geojson, options);
    },

    removeLayer: function (layer) {
      if (this.hasLayer(layer)) {
        this.unindexLayer(layer)
      }
      return window.L.GeoJSON.prototype.removeLayer.call(this, layer)
    }
});


var layer = L.IndexedGeoJSON(data).addTo(map);

var aroundToulouse = layer.searchBuffer(L.latLng([43.60, 1.44]), 0.1);

Changelog

0.0.2

• Add bower.json

0.0.1

• Initial version

Authors