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zhongjin
2020-06-15 12:07:54 +08:00
parent 610ed21a90
commit a96ef233c9
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229
lib/assets/javascripts/cdb/vendor/GeoJSON.js vendored Normal file
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var GeoJSON = function( geojson, options ){
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]);
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]);
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]);
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]);
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]);
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 - 1; k++){
var ll = new google.maps.LatLng(geojsonGeometry.coordinates[i][j][k][1], geojsonGeometry.coordinates[i][j][k][0]);
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;
};