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L.GeoJSON = L.LayerGroup.extend({
includes: L.Mixin.Events,
initialize: function(geojson, options) {
L.Util.setOptions(this, options);
this._geojson = geojson;
this._layers = {};
if (geojson) {
this.addGeoJSON(geojson);
}
},
addGeoJSON: function(geojson) {
if (geojson.features) {
for (var i = 0, len = geojson.features.length; i < len; i++) {
this.addGeoJSON(geojson.features[i]);
}
return;
}
var isFeature = (geojson.type == 'Feature'),
geometry = (isFeature ? geojson.geometry : geojson),
layer = L.GeoJSON.geometryToLayer(geometry, this.options.pointToLayer);
this.fire('featureparse', {
layer: layer,
properties: geojson.properties,
geometryType: geometry.type,
bbox: geojson.bbox,
id: geojson.id
});
this.addLayer(layer);
}
});
L.Util.extend(L.GeoJSON, {
geometryToLayer: function(geometry, pointToLayer) {
var coords = geometry.coordinates,
latlng, latlngs,
i, len,
layer,
layers = [];
switch (geometry.type) {
case 'Point':
latlng = this.coordsToLatLng(coords);
return pointToLayer ? pointToLayer(latlng) : new L.Marker(latlng);
case 'MultiPoint':
for (i = 0, len = coords.length; i < len; i++) {
latlng = this.coordsToLatLng(coords[i]);
layer = pointToLayer ? pointToLayer(latlng) : new L.Marker(latlng);
layers.push(layer);
}
return new L.FeatureGroup(layers);
case 'LineString':
latlngs = this.coordsToLatLngs(coords);
return new L.Polyline(latlngs);
case 'Polygon':
latlngs = this.coordsToLatLngs(coords, 1);
return new L.Polygon(latlngs);
case 'MultiLineString':
latlngs = this.coordsToLatLngs(coords, 1);
return new L.MultiPolyline(latlngs);
case "MultiPolygon":
latlngs = this.coordsToLatLngs(coords, 2);
return new L.MultiPolygon(latlngs);
case "GeometryCollection":
for (i = 0, len = geometry.geometries.length; i < len; i++) {
layer = this.geometryToLayer(geometry.geometries[i]);
layers.push(layer);
}
return new L.FeatureGroup(layers);
default:
throw new Error('Invalid GeoJSON object.');
}
},
coordsToLatLng: function(/*Array*/ coords, /*Boolean*/ reverse)/*: LatLng*/ {
var lat = parseFloat(coords[reverse ? 0 : 1]),
lng = parseFloat(coords[reverse ? 1 : 0]);
return new L.LatLng(lat, lng);
},
coordsToLatLngs: function(/*Array*/ coords, /*Number*/ levelsDeep, /*Boolean*/ reverse)/*: Array*/ {
var latlng, latlngs = [],
i, len = coords.length;
for (i = 0; i < len; i++) {
latlng = levelsDeep ?
this.coordsToLatLngs(coords[i], levelsDeep - 1, reverse) :
this.coordsToLatLng(coords[i], reverse);
latlngs.push(latlng);
}
return latlngs;
}
});
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