forked from Leaflet/Leaflet
/
GeoJSON.js
136 lines (107 loc) · 3.35 KB
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GeoJSON.js
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L.GeoJSON = L.FeatureGroup.extend({
initialize: function (geojson, options) {
L.Util.setOptions(this, options);
this._layers = {};
if (geojson) {
this.addData(geojson);
}
},
addData: function (geojson) {
var features = geojson instanceof Array ? geojson : geojson.features,
i, len;
if (features) {
for (i = 0, len = features.length; i < len; i++) {
this.addData(features[i]);
}
return this;
}
var options = this.options;
if (options.filter && !options.filter(geojson)) { return; }
var layer = L.GeoJSON.geometryToLayer(geojson, options.pointToLayer);
layer.feature = geojson;
this.resetStyle(layer);
if (options.onEachFeature) {
options.onEachFeature(geojson, layer);
}
return this.addLayer(layer);
},
resetStyle: function (layer) {
var style = this.options.style;
if (style) {
this._setLayerStyle(layer, style);
}
},
setStyle: function (style) {
this.eachLayer(function (layer) {
this._setLayerStyle(layer, style);
}, this);
},
_setLayerStyle: function (layer, style) {
if (typeof style === 'function') {
style = style(layer.feature);
}
if (layer.setStyle) {
layer.setStyle(style);
}
}
});
L.Util.extend(L.GeoJSON, {
geometryToLayer: function (geojson, pointToLayer) {
var geometry = geojson.type === 'Feature' ? geojson.geometry : geojson,
coords = geometry.coordinates,
layers = [],
latlng, latlngs, i, len, layer;
switch (geometry.type) {
case 'Point':
latlng = this.coordsToLatLng(coords);
return pointToLayer ? pointToLayer(geojson, latlng) : new L.Marker(latlng);
case 'MultiPoint':
for (i = 0, len = coords.length; i < len; i++) {
latlng = this.coordsToLatLng(coords[i]);
layer = pointToLayer ? pointToLayer(geojson, 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], pointToLayer);
layers.push(layer);
}
return new L.FeatureGroup(layers);
default:
throw new Error('Invalid GeoJSON object.');
}
},
coordsToLatLng: function (coords, reverse) { // (Array, Boolean) -> LatLng
var lat = parseFloat(coords[reverse ? 0 : 1]),
lng = parseFloat(coords[reverse ? 1 : 0]);
return new L.LatLng(lat, lng, true);
},
coordsToLatLngs: function (coords, levelsDeep, reverse) { // (Array, Number, Boolean) -> Array
var latlng,
latlngs = [],
i, len;
for (i = 0, len = coords.length; i < len; i++) {
latlng = levelsDeep ?
this.coordsToLatLngs(coords[i], levelsDeep - 1, reverse) :
this.coordsToLatLng(coords[i], reverse);
latlngs.push(latlng);
}
return latlngs;
}
});
L.geoJson = function (geojson, options) {
return new L.GeoJSON(geojson, options);
};