230 lines
7.4 KiB
JavaScript
230 lines
7.4 KiB
JavaScript
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var GeoJSON = function( geojson, options ){
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var _geometryToGoogleMaps = function( geojsonGeometry, opts, geojsonProperties ){
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var googleObj;
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switch ( geojsonGeometry.type ){
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case "Point":
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opts.position = new google.maps.LatLng(geojsonGeometry.coordinates[1], geojsonGeometry.coordinates[0]);
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googleObj = new google.maps.Marker(opts);
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if (geojsonProperties) {
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googleObj.set("geojsonProperties", geojsonProperties);
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}
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break;
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case "MultiPoint":
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googleObj = [];
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for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
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opts.position = new google.maps.LatLng(geojsonGeometry.coordinates[i][1], geojsonGeometry.coordinates[i][0]);
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googleObj.push(new google.maps.Marker(opts));
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}
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if (geojsonProperties) {
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for (var k = 0; k < googleObj.length; k++){
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googleObj[k].set("geojsonProperties", geojsonProperties);
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}
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}
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break;
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case "LineString":
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var path = [];
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for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
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var coord = geojsonGeometry.coordinates[i];
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var ll = new google.maps.LatLng(coord[1], coord[0]);
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path.push(ll);
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}
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opts.path = path;
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googleObj = new google.maps.Polyline(opts);
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if (geojsonProperties) {
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googleObj.set("geojsonProperties", geojsonProperties);
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}
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break;
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case "MultiLineString":
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googleObj = [];
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for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
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var path = [];
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for (var j = 0; j < geojsonGeometry.coordinates[i].length; j++){
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var coord = geojsonGeometry.coordinates[i][j];
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var ll = new google.maps.LatLng(coord[1], coord[0]);
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path.push(ll);
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}
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opts.path = path;
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googleObj.push(new google.maps.Polyline(opts));
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}
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if (geojsonProperties) {
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for (var k = 0; k < googleObj.length; k++){
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googleObj[k].set("geojsonProperties", geojsonProperties);
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}
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}
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break;
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case "Polygon":
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var paths = [];
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var exteriorDirection;
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var interiorDirection;
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for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
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var path = [];
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for (var j = 0; j < geojsonGeometry.coordinates[i].length; j++){
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var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][1], geojsonGeometry.coordinates[i][j][0]);
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path.push(ll);
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}
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if(!i){
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exteriorDirection = _ccw(path);
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paths.push(path);
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}else if(i == 1){
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interiorDirection = _ccw(path);
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if(exteriorDirection == interiorDirection){
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paths.push(path.reverse());
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}else{
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paths.push(path);
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}
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}else{
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if(exteriorDirection == interiorDirection){
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paths.push(path.reverse());
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}else{
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paths.push(path);
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}
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}
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}
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opts.paths = paths;
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googleObj = new google.maps.Polygon(opts);
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if (geojsonProperties) {
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googleObj.set("geojsonProperties", geojsonProperties);
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}
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break;
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case "MultiPolygon":
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googleObj = [];
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for (var i = 0; i < geojsonGeometry.coordinates.length; i++){
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var paths = [];
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var exteriorDirection;
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var interiorDirection;
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for (var j = 0; j < geojsonGeometry.coordinates[i].length; j++){
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var path = [];
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for (var k = 0; k < geojsonGeometry.coordinates[i][j].length - 1; k++){
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var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][k][1], geojsonGeometry.coordinates[i][j][k][0]);
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path.push(ll);
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}
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if(!j){
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exteriorDirection = _ccw(path);
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paths.push(path);
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}else if(j == 1){
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interiorDirection = _ccw(path);
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if(exteriorDirection == interiorDirection){
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paths.push(path.reverse());
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}else{
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paths.push(path);
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}
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}else{
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if(exteriorDirection == interiorDirection){
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paths.push(path.reverse());
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}else{
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paths.push(path);
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}
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}
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}
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opts.paths = paths;
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googleObj.push(new google.maps.Polygon(opts));
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}
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if (geojsonProperties) {
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for (var k = 0; k < googleObj.length; k++){
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googleObj[k].set("geojsonProperties", geojsonProperties);
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}
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}
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break;
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case "GeometryCollection":
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googleObj = [];
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if (!geojsonGeometry.geometries){
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googleObj = _error("Invalid GeoJSON object: GeometryCollection object missing \"geometries\" member.");
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}else{
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for (var i = 0; i < geojsonGeometry.geometries.length; i++){
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googleObj.push(_geometryToGoogleMaps(geojsonGeometry.geometries[i], opts, geojsonProperties || null));
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}
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}
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break;
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default:
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googleObj = _error("Invalid GeoJSON object: Geometry object must be one of \"Point\", \"LineString\", \"Polygon\" or \"MultiPolygon\".");
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}
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return googleObj;
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};
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var _error = function( message ){
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return {
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type: "Error",
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message: message
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};
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};
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var _ccw = function( path ){
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var isCCW;
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var a = 0;
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for (var i = 0; i < path.length-2; i++){
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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()));
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}
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if(a > 0){
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isCCW = true;
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}
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else{
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isCCW = false;
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}
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return isCCW;
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};
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var obj;
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var opts = options || {};
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switch ( geojson.type ){
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case "FeatureCollection":
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if (!geojson.features){
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obj = _error("Invalid GeoJSON object: FeatureCollection object missing \"features\" member.");
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}else{
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obj = [];
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for (var i = 0; i < geojson.features.length; i++){
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obj.push(_geometryToGoogleMaps(geojson.features[i].geometry, opts, geojson.features[i].properties));
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}
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}
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break;
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case "GeometryCollection":
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if (!geojson.geometries){
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obj = _error("Invalid GeoJSON object: GeometryCollection object missing \"geometries\" member.");
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}else{
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obj = [];
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for (var i = 0; i < geojson.geometries.length; i++){
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obj.push(_geometryToGoogleMaps(geojson.geometries[i], opts));
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}
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}
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break;
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case "Feature":
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if (!( geojson.properties && geojson.geometry )){
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obj = _error("Invalid GeoJSON object: Feature object missing \"properties\" or \"geometry\" member.");
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}else{
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obj = _geometryToGoogleMaps(geojson.geometry, opts, geojson.properties);
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}
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break;
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case "Point": case "MultiPoint": case "LineString": case "MultiLineString": case "Polygon": case "MultiPolygon":
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obj = geojson.coordinates
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? obj = _geometryToGoogleMaps(geojson, opts)
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: _error("Invalid GeoJSON object: Geometry object missing \"coordinates\" member.");
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break;
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default:
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obj = _error("Invalid GeoJSON object: GeoJSON object must be one of \"Point\", \"LineString\", \"Polygon\", \"MultiPolygon\", \"Feature\", \"FeatureCollection\" or \"GeometryCollection\".");
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}
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return obj;
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};
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