jasonsanford / geojson-google-maps Goto Github PK

I was trying to put in a bunch of Polygons and Multipolygons in a GeometryCollection object, but it seems only the Polygons show up on the map, but NOT the Multipolygons.

Hey Jason,

Added:

    GeoJSON.mapCenter()
    GeoJSON.getBounds()

Modified your code:

var GeoJSON = function( geojson, options ){

        var llbounds = new google.maps.LatLngBounds();  

        Function.prototype.getCenter = function(){
            return llbounds.getCenter();
        }

        Function.prototype.getBounds = function(){
            return llbounds;
        }


        var _geometryToGoogleMaps = function( geojsonGeometry, opts, geojsonProperties ){

        var googleObj;

        switch ( geojsonGeometry.type ){
            case "Point":
                opts.position = new google.maps.LatLng(geojsonGeometry.coordinates[1], geojsonGeometry.coordinates[0]);
                llbounds.extend(opts.point);
                googleObj = new google.maps.Marker(opts);
                if (geojsonProperties) {
                    googleObj.set("geojsonProperties", geojsonProperties);
                }
                break;

            case "MultiPoint":
                googleObj = [];
                for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
                    opts.position = new google.maps.LatLng(geojsonGeometry.coordinates[i][1], geojsonGeometry.coordinates[i][0]);
                    llbounds.extend(opts.point);
                    googleObj.push(new google.maps.Marker(opts));
                }
                if (geojsonProperties) {
                    for (var k = 0; k < googleObj.length; k++){
                        googleObj[k].set("geojsonProperties", geojsonProperties);
                    }
                }
                break;

            case "LineString":
                var path = [];
                for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
                    var coord = geojsonGeometry.coordinates[i];
                    var ll = new google.maps.LatLng(coord[1], coord[0]);
                    llbounds.extend(ll);
                    path.push(ll);
                }
                opts.path = path;
                googleObj = new google.maps.Polyline(opts);
                if (geojsonProperties) {
                    googleObj.set("geojsonProperties", geojsonProperties);
                }
                break;

            case "MultiLineString":
                googleObj = [];
                for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
                    var path = [];
                    for (var j = 0; j < geojsonGeometry.coordinates[i].length; j++){
                        var coord = geojsonGeometry.coordinates[i][j];
                        var ll = new google.maps.LatLng(coord[1], coord[0]);
                        llbounds.extend(ll);
                        path.push(ll);
                    }
                    opts.path = path;
                    googleObj.push(new google.maps.Polyline(opts));
                }
                if (geojsonProperties) {
                    for (var k = 0; k < googleObj.length; k++){
                        googleObj[k].set("geojsonProperties", geojsonProperties);
                    }
                }
                break;

            case "Polygon":
                var paths = [];
                var exteriorDirection;
                var interiorDirection;
                for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
                    var path = [];
                    for (var j = 0; j < geojsonGeometry.coordinates[i].length; j++){
                        var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][1], geojsonGeometry.coordinates[i][j][0]);
                        llbounds.extend(ll);
                        path.push(ll);
                    }
                    if(!i){
                        exteriorDirection = _ccw(path);
                        paths.push(path);
                    }else if(i == 1){
                        interiorDirection = _ccw(path);
                        if(exteriorDirection == interiorDirection){
                            paths.push(path.reverse());
                        }else{
                            paths.push(path);
                        }
                    }else{
                        if(exteriorDirection == interiorDirection){
                            paths.push(path.reverse());
                        }else{
                            paths.push(path);
                        }
                    }
                }
                opts.paths = paths;
                googleObj = new google.maps.Polygon(opts);
                if (geojsonProperties) {
                    googleObj.set("geojsonProperties", geojsonProperties);
                }
                break;

            case "MultiPolygon":
                googleObj = [];
                for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
                    var paths = [];
                    var exteriorDirection;
                    var interiorDirection;
                    for (var j = 0; j < geojsonGeometry.coordinates[i].length; j++){
                        var path = [];
                        for (var k = 0; k < geojsonGeometry.coordinates[i][j].length; k++){
                            var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][k][1], geojsonGeometry.coordinates[i][j][k][0]);
                            llbounds.extend(ll);
                            path.push(ll);
                        }
                        if(!j){
                            exteriorDirection = _ccw(path);
                            paths.push(path);
                        }else if(j == 1){
                            interiorDirection = _ccw(path);
                            if(exteriorDirection == interiorDirection){
                                paths.push(path.reverse());
                            }else{
                                paths.push(path);
                            }
                        }else{
                            if(exteriorDirection == interiorDirection){
                                paths.push(path.reverse());
                            }else{
                                paths.push(path);
                            }
                        }
                    }
                    opts.paths = paths;
                    googleObj.push(new google.maps.Polygon(opts));
                }
                if (geojsonProperties) {
                    for (var k = 0; k < googleObj.length; k++){
                        googleObj[k].set("geojsonProperties", geojsonProperties);
                    }
                }
                break;

            case "GeometryCollection":
                googleObj = [];
                if (!geojsonGeometry.geometries){
                    googleObj = _error("Invalid GeoJSON object: GeometryCollection object missing \"geometries\" member.");
                }else{
                    for (var i = 0; i < geojsonGeometry.geometries.length; i++){
                        googleObj.push(_geometryToGoogleMaps(geojsonGeometry.geometries[i], opts, geojsonProperties || null));
                    }
                }
                break;

            default:
                googleObj = _error("Invalid GeoJSON object: Geometry object must be one of \"Point\", \"LineString\", \"Polygon\" or \"MultiPolygon\".");
        }

        return googleObj;

    };

    var _error = function( message ){

        return {
            type: "Error",
            message: message
        };

    };

    var _ccw = function( path ){
        var isCCW;
        var a = 0;
        for (var i = 0; i < path.length-2; i++){
            a += ((path[i+1].lat() - path[i].lat()) * (path[i+2].lng() - path[i].lng()) - (path[i+2].lat() - path[i].lat()) * (path[i+1].lng() - path[i].lng()));
        }
        if(a > 0){
            isCCW = true;
        }
        else{
            isCCW = false;
        }
        return isCCW;
    };

    var obj;

    var opts = options || {};

    switch ( geojson.type ){

        case "FeatureCollection":
            if (!geojson.features){
                obj = _error("Invalid GeoJSON object: FeatureCollection object missing \"features\" member.");
            }else{
                obj = [];
                for (var i = 0; i < geojson.features.length; i++){
                    obj.push(_geometryToGoogleMaps(geojson.features[i].geometry, opts, geojson.features[i].properties));
                }
            }
            break;

        case "GeometryCollection":
            if (!geojson.geometries){
                obj = _error("Invalid GeoJSON object: GeometryCollection object missing \"geometries\" member.");
            }else{
                obj = [];
                for (var i = 0; i < geojson.geometries.length; i++){
                    obj.push(_geometryToGoogleMaps(geojson.geometries[i], opts));
                }
            }
            break;

        case "Feature":
            if (!( geojson.properties && geojson.geometry )){
                obj = _error("Invalid GeoJSON object: Feature object missing \"properties\" or \"geometry\" member.");
            }else{
                obj = _geometryToGoogleMaps(geojson.geometry, opts, geojson.properties);
            }
            break;

        case "Point": case "MultiPoint": case "LineString": case "MultiLineString": case "Polygon": case "MultiPolygon":
            obj = geojson.coordinates
                ? obj = _geometryToGoogleMaps(geojson, opts)
                : _error("Invalid GeoJSON object: Geometry object missing \"coordinates\" member.");
            break;

        default:
            obj = _error("Invalid GeoJSON object: GeoJSON object must be one of \"Point\", \"LineString\", \"Polygon\", \"MultiPolygon\", \"Feature\", \"FeatureCollection\" or \"GeometryCollection\".");

    }

    return obj;

};

Right now every Point gets an options of it's GeometryCollection according to this part of code:

var opts = options || {};

isn't it good to extend this options here, like this:

case "Point": case "MultiPoint": case "LineString": case "MultiLineString": case "Polygon": case "MultiPolygon": obj = geojson.coordinates ? { opts.extend(geojson.options); obj = _geometryToGoogleMaps(geojson, opts); } : _error("Invalid GeoJSON object: Geometry object missing \"coordinates\" member."); break;

It would be super fantastic if this has a license file / text block somewhere indicating that it is cool to use it. It would be doubly fantastic if the license was something permissive like BSD / MIT.

Thanks for the software, I appreciate your efforts on our behalf.

A Sample BSD License

To ensure that the children's properties are being copied to the resulting g.m.Polygon object, line 202 should be changed to:

obj.push(_geometryToGoogleMaps(geojson.geometries[i], opts, geojson.geometries[i].properties));

Hello,

thanks for the script.

While debugging my code, i came to see this in the spec:

"Paths are closed automatically; do not repeat the first vertex of the path as the last vertex."

See:

https://developers.google.com/maps/documentation/javascript/reference#PolygonOptions

The linear rings in polygons in GeoJson have this extra vertex. So it could be removed (go up to length-1), when copying/transforming, like your script does.

                        for (var k = 0; k < geojsonGeometry.coordinates[i][j].length; k++){
                            // the ring: array of coordinates, where first/last coordinate/vertex/point match
                            var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][k][1], geojsonGeometry.coordinates[i][j][k][0]);
                            bounds.extend(ll);
                            path.push(ll);
                        }

Thats all :)

So, the Geojson for the polygon with hole, I'm using looks like this:

{"type": "Polygon", "coordinates": [

[ [ 75.889979740301499, 14.124073402361812 ], [ 79.596655025929664, 14.10023626226131 ], [ 79.554940030753784, 11.871463662864317 ], [ 75.895939025326626, 11.919137943065323 ], [ 75.889979740301499, 14.124073402361812 ] ],

[ [ 77.4240645, 13.0688045 ], [ 77.4356598, 13.0623401 ], [ 77.4349211, 13.0589817 ], [ 77.436768, 13.0515452 ], [ 77.441693, 13.0429089 ], [ 77.4468644, 13.0257554 ], [ 77.4423087, 13.0195174 ], [ 77.4402154, 13.0087206 ], [ 77.4383686, 13.0087206 ], [ 77.4383686, 13.0112399 ], [ 77.4308579, 13.0114798 ], [ 77.4297497, 13.0066811 ], [ 77.4378761, 13.0059614 ], [ 77.4405849, 13.0000828 ], [ 77.4471106, 12.995164 ], [ 77.446495, 12.984726 ], [ 77.4409543, 12.9812466 ], [ 77.4263022, 12.9829263 ], [ 77.4215002, 12.9712881 ], [ 77.4250709, 12.9667286 ], [ 77.4196532, 12.9670884 ], [ 77.4159595, 12.9586893 ], [ 77.4166982, 12.9481298 ], [ 77.4221158, 12.9470499 ], [ 77.4226084, 12.9405699 ], [ 77.4155901, 12.94081 ], [ 77.4123888, 12.9346899 ], [ 77.4215002, 12.9332498 ], [ 77.4189145, 12.9277296 ], [ 77.4216232, 12.9225693 ], [ 77.4080794, 12.9230493 ], [ 77.4068481, 12.9156087 ], [ 77.4095569, 12.9069676 ], [ 77.395389, 12.9089109 ], [ 77.3934272, 12.909248 ], [ 77.3947816, 12.8919652 ], [ 77.3928116, 12.885964 ], [ 77.3935504, 12.8695199 ], [ 77.4021693, 12.8650786 ], [ 77.4035236, 12.8730008 ], [ 77.4093106, 12.8751614 ], [ 77.4162057, 12.8749213 ], [ 77.4153439, 12.8714403 ], [ 77.4216232, 12.8716805 ], [ 77.4279028, 12.8746813 ], [ 77.4307347, 12.8750414 ], [ 77.4302422, 12.8697599 ], [ 77.4189145, 12.8687997 ], [ 77.423224, 12.860037 ], [ 77.4303654, 12.8564358 ], [ 77.4275334, 12.8500736 ], [ 77.4386149, 12.8492333 ], [ 77.4365217, 12.8465923 ], [ 77.4559758, 12.8392693 ], [ 77.4554833, 12.8327867 ], [ 77.4579458, 12.8276245 ], [ 77.4604084, 12.8275044 ], [ 77.4580689, 12.8203011 ], [ 77.4680422, 12.8096157 ], [ 77.4804781, 12.8078147 ], [ 77.4840488, 12.8154986 ], [ 77.4929139, 12.816099 ], [ 77.4951302, 12.822342 ], [ 77.5019022, 12.822222 ], [ 77.5100286, 12.8267841 ], [ 77.5182781, 12.8235426 ], [ 77.5200019, 12.8127373 ], [ 77.5243112, 12.8114166 ], [ 77.5299752, 12.8127373 ], [ 77.5318221, 12.8139379 ], [ 77.5305908, 12.8163391 ], [ 77.5369934, 12.8193406 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77.4240645, 13.0688045 ]]]}

Why is this not loading as a hole in a polygon?

I have 2 different implementations of CW / CCW checking a polygon that says _CCW is broken.

in this polygon-with-a-hole example, the first (container) polygon returns FALSE when in fact it should be TRUE

POLYGON((12.506438874490113 55.69387403915987,12.506383924458678 55.69387945126558,12.506213385267452 55.69393118376367,12.506056215448675 55.69401519278204,12.505918454950342 55.69412824990123,12.505805397831145 55.694266010399566,12.505721388812773 55.694423180218344,12.50566965631469 55.694593719409575,12.505652188387785 55.69477107424777,12.505652188387785 55.694782297592326,12.50566965631469 55.69495965243052,12.505721388812773 55.69513019162175,12.505805397831145 55.69528736144053,12.50591845495034 55.69542512193886,12.506288781107672 55.6957954480962,12.506287364476293 55.695798284665685,12.506226626676789 55.695954472826,12.506195590101983 55.696119156014994,12.506195309418892 55.69628673806335,12.506225794165529 55.69645152429437,12.506286008426782 55.696607915037234,12.506373906036295 55.69675059591176,12.50638064841556 55.69675956830191,12.506501158182662 55.69689085905994,12.506644965944647 55.6969961168136,12.506806545249868 55.69707129656644,12.506979686696237 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I wrote a version 2.0 of this utility to handle conversion from Google Maps overlays to GeoJSON (my fork).

List of changes:

• mounted functions in the google.maps.geojson namespace (google.maps.geojson.fromGeoJSON() instead of new GeoJSON())
• created google.maps.geojson.toGeoJSON()
• removed duplicate points in GeoJSON polygons for closing rings when converting to GMaps overlays
• setup a test suite using QUnit which tests GeoJSON -> GMaps, GMaps -> GeoJSON, and GeoJSON -> GMaps -> GeoJSON

toGeoJSON() is designed to handle the output of fromGeoJSON(), though it only handles a subset because I'm not sure how/if it could handle features and collections. The old interactive test page has a perfect example for this:

 {
  "type": "GeometryCollection",
  "geometries": [
    {
      "type": "Point",
      "coordinates": [-80.66256, 35.04271]
    },{
      "type": "MultiPolygon",
      "coordinates": [
        [
          [
            [-80.661917125299155, 35.042245264120233],
            [-80.662257428469147, 35.042566288770765],
            [-80.662116500253873, 35.042670715828088],
            [-80.661715367137106, 35.042389935257198],
            [-80.661917125299155, 35.042245264120233]
          ]
        ],[
          [
            [-80.661547137566686, 35.042510563404129],
            [-80.661677171806787, 35.042417322902836],
            [-80.662084018102888, 35.042702102858307],
            [-80.662039854197829, 35.042756211162953],
            [-80.662002555672572, 35.042820528162387],
            [-80.661457640151127, 35.042647387136952],
            [-80.661547137566686, 35.042510563404129]
          ]
        ]
      ]
    },{
      "type": "LineString",
      "coordinates": [
        [-80.661983228058659, 35.042968081213758],
        [-80.662076494242413, 35.042749414542243],
        [-80.662196794397431, 35.042626481357232],
        [-80.664238981504525, 35.041175532632963]
      ]
    }
  ]
}

When this is converted to GMaps overlays, you have this:

[
  Marker,
  [
    Polygon,
    Polygon
  ],
  Polyline
]

The problem here is that I can't know if the two Polygons are part of a MultiPolygon or a nested GeometryCollection. It's easy to conceive of more complicated examples. If we can't find a method for generating GeoJSON GeometryCollections such that it always matches the input to fromGeoJSON() then I'd rather not deal with it and just let the user manage the complexity if they're ever unlucky enough to need that functionality.

Polygons that are overlaid appear as clickable but I can't seem to add click events using the google maps API:

overlay = new GeoJSON( data );
google.maps.event.addListener( overlay, 'click', function( e ) {
   console.log( e );
} );

I can't work out if there's a sub object I need to bind to. Nothing I've tried seems to bind the event.

Hi.

I know there is an issue about this (#14) but you closed it without explain. This function is really useful in some case and I don't know why you reject it. Any good reason ?

Thanks

GeometryCollection is a valid value for any geometry member. We should handle this by wrapping the GeometryCollections geometries' Google Maps equivalents (Marker, Polyline, Polygon) in a array.

var myFeature = {
    "type": "Feature",
    "geometry": {
        "type": "GeometryCollection",
        "geometries": [
            {
                "type": "Point",
                "coordinates": [
                    -80.23569,
                    35.23614
                ]
            },{
                "type": "Point",
                "coordinates": [
                    -83.92465,
                    37.55484
                ]
            }
        ]
    }
}

var myGoogleVectors = new GeoJSON(myFeature);

// returns an array with two google.maps.Markers

Would really be nice to have that one added as it's most popular and most convenient option:

"dependencies": {
    "geoJSON-to-Google-Maps": "1.0.x"
},

Guess the package.json would look something like this:

{
    "name": "geoJSON-to-Google-Maps",
    "version": "1.0.0",
    "description": "Just a simple utility to convert GeoJSON objects to Google Maps vector objects (Marker, Polyline, Polygon)",
    "author": "Jason Sanford <[email protected]>",
    "dependencies": {
        "express": ">= 1.0.0",
        "optimist": ">= 1.0.0"
    },
    "engine": "node 0.6.x"
}

which would need to be aligned by a registration on the NPM package repo.

Thanks in advance!

hello,

I found a 'bug' in your code, it seems, you invert 0 and 1
for example, here, your code :
var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][1], geojsonGeometry.coordinates[i][j][0]);
but it seems to be better using this (working for me):
var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][0], geojsonGeometry.coordinates[i][j][1]);

I've found that the geometries that come through GeoJSON.js seem to be missing any holes - any ideas on how to fix this? When I load the json data up in QGIS it displays fine there, so I know it's not the data. I did see a javascript implementation of a JSON > Google Maps feature elsewhere that supposedly takes into consideration polygons with internal rings like this, but unfortunately my JS knowledge is not sufficient to debug that particular implementation or factor it into your code. It's here if you'd like to take a look:

http://friism.com/drawing-geojson-based-polygons-on-google-maps/comment-page-1#comment-1651

https://github.com/chilijung/geojson-gmap