// Searches for an ConstraintVehicleHandler instance in the Simulation.ForceEffects.
private static ConstraintVehicleHandler GetHandler(Simulation simulation)
{
foreach (var forceEffect in simulation.ForceEffects)
{
ConstraintVehicleHandler handler = forceEffect as ConstraintVehicleHandler;
if (handler != null)
{
return(handler);
}
}
return(null);
}
// Creates or gets the ConstraintVehicleHandler instance and adds a vehicle.
internal static void Add(ConstraintVehicle vehicle)
{
var simulation = vehicle.Simulation;
var handler = GetHandler(simulation);
if (handler == null)
{
// The first vehicle: Add a new instance of this class to the simulation.
handler = new ConstraintVehicleHandler();
simulation.ForceEffects.Add(handler);
simulation.SubTimeStepFinished += handler.OnSubTimeStepFinished;
}
handler._vehicles.Add(vehicle);
}
// Removes a vehicle. When the last vehicle is removed, the ConstraintVehicleHandler
// instance is removed too.
internal static void Remove(ConstraintVehicle vehicle)
{
Simulation simulation = vehicle.Simulation;
ConstraintVehicleHandler handler = GetHandler(simulation);
if (handler != null)
{
handler._vehicles.Remove(vehicle);
// The last vehicle was removed.
if (handler._vehicles.Count == 0)
{
simulation.ForceEffects.Remove(handler);
simulation.SubTimeStepFinished -= handler.OnSubTimeStepFinished;
}
}
}