protected virtual void CheckState()
{
//refresh state to take new variables state
ChangeState(state);
switch (state)
{
case AntState.lookForFood:
if (food != null)
{
ChangeState(AntState.goToFood);
}
break;
case AntState.goToFood:
if (food.Amount == 0 && Vector2.Distance(foodPosition, Position) < ConstantsHolder.Singleton.Vision)
{
food = null;
ChangeState(AntState.lookForFood);
break;
}
if (Vector2.Distance(foodPosition, Position) < ConstantsHolder.Singleton.EatingRadius)
{
foodCarried = ConstantsHolder.Singleton.CarryMax;
food.Amount -= ConstantsHolder.Singleton.CarryMax;
ChangeState(AntState.bringBackFood);
}
break;
case AntState.bringBackFood:
if (Vector2.Distance(AntHill.Position, Position) < ConstantsHolder.Singleton.EatingRadius)
{
game.AntHill.Food += foodCarried;
foodCarried = 0;
ChangeState(AntState.goToFood);
}
break;
case AntState.transportCorpse:
cadaver.Position = position;
//if the ant don't know a cemetery it will just put the corpse at a sanitary distance of the anthill
if (cemeteryBest == null)
{
if (Vector2.Distance(position, antHill.Position) > ConstantsHolder.Singleton.SainityDistance)
{
//double tap!
cadaver.Kill();
if (leftToClean > 0)
{
ChangeState(AntState.backToClean);
}
else
{
ChangeState(previousState);
}
}
}
else
{
// the ant reaches the biggest known cemetery it put the cadaver in the cemetery
if (Vector2.Distance(goal, Position) < ConstantsHolder.Singleton.EatingRadius)
{
//if the best known have desapeared the ant just put the corpse at a sanitary distance from the anthill
if (cemeteryBest.Count == 0)
{
cemeteryBest = null;
//double tap!
cadaver.Kill();
}
else
{
cemeteryBest.Add(cadaver);
}
cadaver = null;
//go back to clean the previous cemetery if it is not known as empty
if (leftToClean > 0)
{
ChangeState(AntState.backToClean);
}
else
{
ChangeState(previousState);
}
break;
}
}
break;
case AntState.goToCorpse:
if (Vector2.Distance(goal, Position) < ConstantsHolder.Singleton.EatingRadius)
{
//take a cadaver in a cemetery when it reach it
if (cemeteryToClean.Contains(cadaver))
{
cemeteryToClean.Remove(cadaver);
leftToClean = cemeteryToClean.Count;
//if taking the corpse clean the cemetery it will be destroyed
if (cemeteryToClean.Count == 0)
{
game.Cemeteries.Remove(cemeteryToClean);
cemeteryToClean = null;
}
ChangeState(AntState.transportCorpse);
}
//if the corpse have been taken by an other ant, it return to normal activity
else
{
ChangeState(previousState);
}
}
break;
//go back the previous cemetery to clean it
case AntState.backToClean:
//if the cemetery is empty the ant remove it and go back to its activity
//if it's full the ant will automatically change state to goforCorpse from the cemetery scan in the update function
if (Vector2.Distance(goal, Position) < ConstantsHolder.Singleton.Vision)
{
if (cemeteryToClean == null || cemeteryToClean.Count == 0)
{
leftToClean = 0;
cemeteryToClean = null;
if (previousState == AntState.backToClean)
{
previousState = AntState.lookForFood;
}
ChangeState(previousState);
}
}
break;
}
}
public override void Update(GameTime gameTime)
{
base.Update(gameTime);
//the ant have a certain probability to die each frame
double ran = game.Random.NextDouble();
if (ran < 0.5f / ConstantsHolder.Singleton.HalfLife)
{
Kill();
}
CheckState();
if (Vector2.Distance(AntHill.Position, Position) < ConstantsHolder.Singleton.EatingRadius)
{
if (AntHill.Food >= 0)
{
AntHill.Food -= Hungry;
Hungry = 0;
}
}
if (Hungry > ConstantsHolder.Singleton.Starvation)
{
Kill();
}
//find closest food point
foreach (Food possibleFood in game.Foods)
{
if (Vector2.Distance(possibleFood.Position, Position) < ConstantsHolder.Singleton.Vision &&
(food == null || Vector2.Distance(possibleFood.Position, AntHill.Position) < Vector2.Distance(food.Position, AntHill.Position)))
{
food = possibleFood;
foodPosition = possibleFood.Position;
if (state == AntState.goToFood)
{
goal = food.Position;
}
}
}
//find bigest cemetery around
for (int i = 0; i < game.Cemeteries.Count; i++)
{
Cemetery possibleCemetery = game.Cemeteries[i];
//within view range
if (Vector2.Distance(possibleCemetery.Position, Position) < ConstantsHolder.Singleton.Vision &&
possibleCemetery.Count != 0)
{
//find bigest cemetery
if (Vector2.Distance(possibleCemetery.Position, antHill.Position) >= ConstantsHolder.Singleton.SainityDistance &&
(cemeteryBest == null || possibleCemetery.Count > cemeterySmell))
{
//if the ant had a previous best cemetery, it decided to move it in the new one
bool needToClean = false;
if (cemeteryBest != null &&
cemeteryBest != possibleCemetery &&
state != AntState.goToCorpse &&
state != AntState.transportCorpse)
{
cemeteryToClean = cemeteryBest;
cemeteryToCleanPos = cemeteryToClean.Position;
previousState = state;
needToClean = true;
}
//update the biggest known cemetery
cemeteryBest = possibleCemetery;
cemeterySmell = possibleCemetery.Count;
if (state == AntState.transportCorpse)
{
goal = possibleCemetery.Position;
goalLover = ConstantsHolder.Singleton.TransportGoal;
}
//start to clean the old cemetery
if (needToClean)
{
ChangeState(AntState.backToClean);
}
}
////with a decent distance to the hill
//if (Vector2.Distance(possibleCemetery.Position, antHill.Position) >= ConstantsHolder.Singleton.SainityDistance
// && (cemeteryBest == null || possibleCemetery.Count > cemeterySmell))
//{
// bool needToClean = false;
// if (cemeteryBest != null
// && cemeteryBest != possibleCemetery
// && state != AntState.goToCorpse
// && state != AntState.transportCorpse)
// {
// cemeteryToClean = cemeteryBest;
// cemeteryToCleanPos = cemeteryToClean.Position;
// previousState = state;
// needToClean = true;
// }
// cemeteryBest = possibleCemetery;
// cemeterySmell = possibleCemetery.Count;
// if (state == AntState.transportCorpse)
// {
// goal = possibleCemetery.Position;
// goalLover = ConstantsHolder.Singleton.TransportGoal;
// }
// if (needToClean)
// {
// ChangeState(AntState.backToClean);
// }
//}
//Update the size of the biggest known cemetery
if (possibleCemetery == cemeteryBest)
{
cemeterySmell = possibleCemetery.Count;
}
//if the cemetery seen is not the biggest the ant start to clean it
//if the ant is not already carrying a corpse a going to a corpse
else if (state != AntState.goToCorpse && state != AntState.transportCorpse)
{
cadaver = possibleCemetery.Last();
//handle a little bug that sometime the cemetery have one null cadaver instead of nothing
//it would be maybe cleaner to prevent that
if (cadaver != null)
{
cemeteryToClean = possibleCemetery;
cemeteryToCleanPos = cemeteryToClean.Position;
previousState = state;
//remember the size to know if there is a need to come back to clean
leftToClean = cemeteryToClean.Count;
ChangeState(AntState.goToCorpse);
}
else
{
//we don't keep empty cemeteries
game.Cemeteries.Remove(possibleCemetery);
if (state == AntState.backToClean)
{
cemeteryToClean = null;
ChangeState(previousState);
}
}
}
}
}
this.previousPosition = this.position;
}