public RainStateMachine(string initialStateName)
{
States = new List <RainState>
{
new RainState("Clear"),
new RainState("Light Rain"),
new RainState("Heavy Rain"),
new RainState("Tropical Storm")
};
Get("Clear").Link(Get("Clear"), 40);
Get("Clear").Link(Get("Light"), 40);
Get("Clear").Link(Get("Heavy"), 19);
Get("Clear").Link(Get("Storm"), 01);
Get("Light").Link(Get("Clear"), 30);
Get("Light").Link(Get("Light"), 50);
Get("Light").Link(Get("Heavy"), 18);
Get("Light").Link(Get("Storm"), 02);
Get("Heavy").Link(Get("Clear"), 25);
Get("Heavy").Link(Get("Light"), 50);
Get("Heavy").Link(Get("Heavy"), 20);
Get("Heavy").Link(Get("Storm"), 05);
Get("Storm").Link(Get("Clear"), 05);
Get("Storm").Link(Get("Light"), 15);
Get("Storm").Link(Get("Heavy"), 75);
Get("Storm").Link(Get("Storm"), 05);
CurrentState = Get(initialStateName);
if (CurrentState == null)
{
throw new Exception("The given initial state of '" + initialStateName + "' could not be found.");
}
bool valid = true;
foreach (var state in States)
{
if (!state.Valid)
{
valid = false;
break;
}
}
if (!valid)
{
throw new Exception("The given states are not valid.");
}
}
/// <summary>
/// Follows the indicated path along the probabilistic state transition diagram implemented in the constructor.
/// </summary>
/// <returns></returns>
private void Update(int roll)
{
int total = 0;
foreach (var state in CurrentState.LinkedStates)
{
if (roll <= state.Value + total)
{
CurrentState = state.Key;
return;
}
else
{
total += state.Value;
}
}
throw new Exception("A state cannot be found corresponding to the given value");
}
public void Link(RainState state, int probability) => LinkedStates.Add(state, probability);