float[] getCorners(G_LatLng center, float zoom, float mapWidth, float mapHeight)
{
float scale = Mathf.Pow(2, zoom);
MercatorProjection proj = new MercatorProjection();
G_Point centerPx = proj.fromLatLngToPoint(center);
//G_LatLng centerPx = new G_LatLng (0, 0);
G_Point SWPoint = new G_Point(centerPx.x-(mapWidth/2)/scale, centerPx.y+(mapHeight/2)/scale);
G_LatLng SWLatLon = proj.fromPointToLatLng(SWPoint);
G_Point NEPoint = new G_Point(centerPx.x+(mapWidth/2)/scale, centerPx.y-(mapHeight/2)/scale);
G_LatLng NELatLon = proj.fromPointToLatLng(NEPoint);
return new float[]{NELatLon.lat,
NELatLon.lng,
-SWLatLon.lat,
SWLatLon.lng}; // north east south west
}
