[OpenLayers-Users] Google and UK grid vector overlay

[Mauro Bianchi]

Dear all,
I'm pretty new to OL and I want to do the following

1) have a google layer as a base layer
2) overlay a vector layer and add points programmatically. Points
coordinates are given in the UK national grid system (OSGB , which
should be EPSG:27700)

I could convert points coordinates externally, but I'd prefer to do it
directly into OpenLayers, if possibile.
I tried different methods but cannot get it working.
Any help would be really appreciated!

Thank you
Mauro


My code is the following


var map;

var options = {
	projection: new OpenLayers.Projection("EPSG:900913"),
	displayProjection: new OpenLayers.Projection("EPSG:4326"),
	units: "m",
	numZoomLevels: 18,
	maxResolution: 156543.0339,
	maxExtent: new OpenLayers.Bounds(-20037508, -20037508,
									 20037508, 20037508.34)
};

map = new OpenLayers.Map('map', options);

//google maps layer, physical
var gphy = new OpenLayers.Layer.Google(
	"Google Physical",
	{type: G_PHYSICAL_MAP, numZoomLevels: 20,  'sphericalMercator':true}
);

map.addLayers([gphy]);


//a vector layer where i want to add points programmatically
var vectorLayer = new OpenLayers.Layer.Vector("My Geometry");

//this is a point that i want to add in UK grid coordinates
var point = new OpenLayers.Geometry.Point(519000, 165222).transform(
new OpenLayers.Projection("EPSG:27700"), map.projection);
var pointFeature = new OpenLayers.Feature.Vector(point);

vectorLayer.addFeatures([pointFeature]);

map.addLayer(vectorLayer);

//controls and centering
map.addControl(new OpenLayers.Control.LayerSwitcher());			
map.setCenter(new
OpenLayers.LonLat(-0.126343,51.539502).transform(map.displayProjection,
map.projection), 10);




-- 
Mauro Bianchi
bianchimro at gmail.com