OpenSteer::AbstractVehicle* 
OpenSteer::OpenSteerDemo::vehicleNearestToMouse (void)
{
    return (mouseInWindow ? 
            findVehicleNearestScreenPosition (mouseX, mouseY) :
            NULL);
}
void 
OpenSteer::OpenSteerDemo::selectVehicleNearestScreenPosition (int x, int y)
{
    selectedVehicle = findVehicleNearestScreenPosition (x, y);
}
void 
	OpenSteer::OpenSteerDemo::selectVehicleNearestScreenPosition (int x, int y)
{
	SteeringVehicle::setSelectedVehicle( findVehicleNearestScreenPosition (x, y) );
}