Google maps api v2 get polygon coordinate - coordinates

Question

I am a bit of a beginner at google maps api. I managed to let the user to draw a polygon on the map and then I want to get the coordinates on the drew polygon.
I have used the following segment of code but it gave me the following error Uncaught TypeError: Object [object Object] has no method 'getPath'
this is the code that I used
function startShape() {
initialize();
document.getElementById('lat').disabled = true;
document.getElementById('lng').disabled = true;
var polygon = new GPolygon([],"ff0000", 2, 0.7,"ff0000",0.2);
startDrawing(polygon, "Shape " + (++shapeCounter_), function() {
var cell = this;
var area = polygon.getArea();
cell.innerHTML = (Math.round(area / 10000) / 100) + "km<sup>2</sup>";
});
showcoor(polygon);
}
function startDrawing(poly, name, onUpdate) {
map.addOverlay(poly);
poly.enableDrawing(options);
poly.enableEditing({onEvent: "mouseover"});
poly.disableEditing({onEvent: "mouseout"});
GEvent.addListener(poly, "endline", function() {
//var cells = addFeatureEntry(name, color);
//GEvent.bind(poly, "lineupdated", cells.desc, onUpdate);
GEvent.addListener(poly, "click", function(latlng, index) {
if (typeof index == "number") {
poly.deleteVertex(index);
}
});
});
}
function showcoor (poly) {
GEvent.addListener(poly, "endline", function() {
GEvent.addListener(poly, "click", function() {
var str;
var vertices = this.getPath();
for (var i =0; i < vertices.length; i++) {
var xy = vertices.getAt(i);
str += xy.lat() +"," + xy.lng()+"<br />";
}
alert (str);
});
});
}

Answer 1

There is no getPath method on the GPolygon object. See the GPolygon reference.
Instead, you'll need to use getVertexCount() and getVertex(i).
for (var i = 0, I = this.getVertexCount(); i < I; ++i) {
var xy = this.getVertex(i);
str += xy.lat() + ', ' + xy.lng() + '<br />';
}