Using containsLocation with a google.maps.Data.polygon - google-maps

Question

I have a google.maps.Data layer with a polygon feature:
state = new google.maps.Data();
state.loadGeoJson('static/geojson/ga_state.geojson', {
idPropertyName: 'name'
});
state.setStyle({
clickable: false,
visible: false,
});
state.setMap(map);
Within this feature collection is a polygon representing the state of Georgia:
ga = state.getFeatureById('Georgia')
I can get the geometry of this feature:
gaGeom = ga.getGeometry()
But when I pass either of these objects and also the raw array to google.maps.geometry.polygon.containsFeature(), I get an error that the object does not contain the get() fuction:
google.maps.geometry.poly.containsLocation(p.getPosition(), ga)
Uncaught TypeError: b.get is not a function(…)
google.maps.geometry.poly.containsLocation(p.getPosition(), gaGeom)
Uncaught TypeError: b.get is not a function(…)
google.maps.geometry.poly.containsLocation(p.getPosition(), gaGeom.getArray())
Uncaught TypeError: b.get is not a function(…)
How can I get a google.maps.Data.Polygon to either convert to a google.maps.Polygon or to work with this function?
EDIT:
I have found a way to construct a google.maps.Polygon from a google.maps.Data.Polygon as:
//gaGeom is the feature.geometry from the data layer
poly = new google.maps.Polygon({paths:gaGeom.getAt(0).getArray()})
But surely there has to be a cleaner way to construct the google.maps.Polygon?

Answer 1

The google.maps.geometry.poly.containsLocation method takes a point (a google.maps.LatLng) and a polygon (a google.maps.Polygon).
containsLocation(point:LatLng, polygon:Polygon)
Return Value: boolean
Computes whether the given point lies inside the specified polygon.
ga = state.getFeatureById('Georgia') returns a "feature"
gaGeom = ga.getGeometry() returns a "Geometry"
gaGeom.getArray() returns an "Array" of LinearRings
None of which is a google.maps.Polygon. You can make a google.maps.Polygon from the Array (as I see you have discovered while I wrote this).
proof of concept
code:
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(37.4419, -122.1419),
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var state = new google.maps.Data();
var poly;
state.addListener('addfeature', function(evt) {
if (evt.feature.getId() == "Georgia") {
var ga = state.getFeatureById('Georgia');
var gaGeom = ga.getGeometry();
//gaGeom is the feature.geometry from the data layer
poly = new google.maps.Polygon({
paths: gaGeom.getAt(0).getArray(),
map: map,
clickable: false
});
}
});
var infoWindow = new google.maps.InfoWindow();
google.maps.event.addListener(map, 'click', function(evt) {
infoWindow.setPosition(evt.latLng);
if (google.maps.geometry.poly.containsLocation(evt.latLng, poly)) {
infoWindow.setContent("INSIDE POLY<br>" + evt.latLng.toUrlValue(6));
} else {
infoWindow.setContent("OUTSIDE POLY<br>" + evt.latLng.toUrlValue(6));
}
infoWindow.open(map);
});
state.loadGeoJson("http://www.geocodezip.com/GeoJSON/gz_2010_us_040_00_500k.json.txt", {
idPropertyName: 'NAME'
});
state.setStyle({
clickable: false,
visible: false,
});
state.setMap(map);
var geocoder = new google.maps.Geocoder();
geocoder.geocode({
'address': "State of Georgia"
}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
map.fitBounds(results[0].geometry.viewport);
} else {
alert('Geocode was not successful for the following reason: ' + status);
}
});
}
google.maps.event.addDomListener(window, "load", initialize);