Geofencing with Google Maps - sqlite

Question

I'm trying to let people draw a rectangle on Google Maps and store the bottomLeft and topRight coordinates.
I know I can draw a Rectangle codewise (see: http://code.google.com/intl/nl-NL/apis/maps/documentation/javascript/reference.html#Rectangle), but before i can load the bounds from my DB the people need to define it themself first off course :)
So my question is, how can I let people draw a rectangle on Google Maps (API v3) and store the coordinates of the bottomLeft and topRight corner?

Answer 1

Already got it to work by looking into events. Took a lot of my time to make :)
This is how i've done it for people that need it to:
function mapsInitialize()
{
startPoint = new google.maps.LatLng(lat,lon);
options = { zoom: 16, center: startPoint, mapTypeId: google.maps.MapTypeId.HYBRID};
map = new google.maps.Map(document.getElementById("map_canvas"), options);
google.maps.event.addListener(map, 'click', function(event) {
if (drawing == true){
placeMarker(event.latLng);
if (bottomLeft == null) {
bottomLeft = new google.maps.LatLng(event.latLng.Oa, event.latLng.Pa);
}
else if (topRight == null){
topRight = new google.maps.LatLng(event.latLng.Oa, event.latLng.Pa);
drawing = false;
rectangle = new google.maps.Rectangle();
var bounds = new google.maps.LatLngBounds(bottomLeft, topRight);
var rectOptions = {
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#FF0000",
fillOpacity: 0.35,
map: map,
bounds: bounds
};
rectangle.setOptions(rectOptions);
}
}
});
}
function placeMarker(location) {
var marker = new google.maps.Marker({
position: location,
map: map
});
}

Answer 2

If I understand you properly - You need a way to get users inputting some polyline/polygon. If so - take a look at this example, where polygon is created by clicking a map. It uses some class PolygonCreator and jquery. You can adopt this method, and save result in form field (there possible a number of options: JSON or your own method of serialization)
If you just need to show that polygons on map and nothing more: you even can take advantage of geometry.encoding library and store encoded polylines into database. Or, if you are going to use spatial queries (for instance - detect if some point falls into your polygons) you better use spatial extnsion of some sort: MySQL spatial extensions, PostGIS, etc. In MySQL you can store polyline into Polyline or Polygon typed columns, which is based on OpenGIS formats.
Frankly, here on stackoverflow is a whole bunch of related information.