getpaths() polygons google maps api

问题

I am attempting to retrieve the latlng coordinates of both a polyline and polygon. After I complete the drawing of either object I would like to store the latlng in a database, but for now I am merely trying to show the latlng in a textarea. I have done this easily enough for markers, rectangles, and circles, but the terminology for polylines and polygons is baffling me. When I complete the drawing i use an addDomListener(drawingManager, 'polygoncomplete', ... for polyons and then iterate through all the polygons i have drawn. For each polygon I then iterate through its array of coords. I have searched this forums database and tried the Bermuda triangle example on the Google documentation page. Bermuda Example I have read over the documentation many times and just cant see what i am missing. Any help is appreciated.

//Save polygons data to text area
                var polygons = [];

                google.maps.event.addDomListener(drawingManager, 'polygoncomplete', function(polygon) {
                  polygons.push(polygon);
                });

                google.maps.event.addDomListener(savebutton, 'click', function() {
                    document.getElementById("savedatapolygon").value = "";
                    for (var i = 0; i < polygons.length; i++) {
                      var polygonBounds = polygons[i].getPath();
                      var xy;
                        // Iterate over the polygonBounds vertices.
                        for (var i = 0; i < polygonBounds.length; i++) {
                            xy = polygonBounds.getAt(i);
                            contentString += '<br>' + 'Coordinate: ' + i + '<br>' + xy.lat() +',' + xy.lng();
                        }
                      document.getElementById("savedatapolygon").value += "polygon(";
                      document.getElementById("savedatapolygon").value += contentString;
                      document.getElementById("savedatapolygon").value += ")";

                    }
        });

回答1:

The Google Maps Polygon class returns a MVCArray. You need to use the forEach method of the MVCArray to loop through it.

var polygonBounds = polygons[i].getPath();
// Iterate over the polygonBounds vertices.
polygonBounds.forEach(function(xy, i) {
  contentString += '<br>' + 'Coordinate: ' + i + '<br>' + xy.lat() +',' + xy.lng();
});
document.getElementById("savedatapolygon").value += "polygon(";
document.getElementById("savedatapolygon").value += contentString;
document.getElementById("savedatapolygon").value += ")";

来源：https://stackoverflow.com/questions/14948337/getpaths-polygons-google-maps-api