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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
namespace Brains.Framework.Behaviors
{
public class CompositeBehavior : IBehavior,ISubBehaviorHolder
{
private Agent _agent;
private BehaviorList<IBehavior> _subBehaviors;
private int _currentSubBehavior;
/// <summary>
/// Default Constructor
/// </summary>
public CompositeBehavior()
{
_subBehaviors = new BehaviorList<IBehavior>();
_currentSubBehavior = 0;
}
/// <summary>
/// Gets the count of subbehaviors
/// </summary>
public int Count
{
get { return SubBehaviors.Count; }
}
/// <summary>
/// Gets the Agent owner of the behavior
/// </summary>
public Agent Owner
{
get { return _agent; }
}
/// <summary>
/// Gets or sets the subbehaviors list
/// </summary>
public BehaviorList<IBehavior> SubBehaviors
{
get
{
return _subBehaviors;
}
set
{
_subBehaviors = value;
}
}
/// <summary>
/// Gets or sets the index of the currently active sub behavior
/// </summary>
public int CurrentSubBehavior
{
get
{
return _currentSubBehavior;
}
set
{
if (_currentSubBehavior != value)
{
_currentSubBehavior = value;
}
}
}
/// <summary>
/// Gets or sets the current state of the behavior.
/// </summary>
/// <remarks>If the state is Idle and the curent index changes to this behavior, State will automatically get set to Running</remarks>
public BehaviorState State { get; set; }
/// <summary>
/// Sets the Agent owner of the Behavior
/// </summary>
/// <param name="actor">The agent</param>
/// <remarks>This method sets the agent of all subbehaviors if exist</remarks>
public virtual void SetOwner(Agent actor)
{
_agent = actor;
_subBehaviors.Owner = this;
}
/// <summary>
/// Updates the currently active sub behavior of this behavior.
/// </summary>
/// <param name="gameTime"></param>
/// <remarks>If the sub behavior is Idle, it get sets to Running.
/// If the sub behavior is Success or Failed it calls the overridable methods OnSubBehaviorSuccess and OnSubBehaviorFailure.</remarks>
public virtual void Update(GameTime gameTime)
{
if (_subBehaviors != null && Count > 0)
{
UpdateCurrentSubBehavior(gameTime);
}
}
private void UpdateCurrentSubBehavior(GameTime gameTime)
{
IBehavior _behavior = _subBehaviors[_currentSubBehavior];
if (_behavior.State == BehaviorState.Idle || _behavior.State == BehaviorState.Running)
{
_behavior.State = BehaviorState.Running;
_behavior.Update(gameTime);
}
else
{
//Check state of sub behavior after running it
if (_behavior.State == BehaviorState.Success)
OnSubBehaviorSuccess();
else if (_behavior.State == BehaviorState.Failed)
OnSubBehaviorFailure();
}
}
public virtual void OnSuccess()
{
}
public virtual void OnFailure()
{
}
public virtual void OnSubBehaviorSuccess()
{
}
public virtual void OnSubBehaviorFailure()
{
}
public virtual void Reset()
{
State = BehaviorState.Idle;
CurrentSubBehavior = 0;
foreach (var item in SubBehaviors)
{
item.Reset();
}
}
/// <summary>
/// Gets the currently active sub behavior as an IBehavior
/// </summary>
public IBehavior CurrentBehavior
{
get { return SubBehaviors[CurrentSubBehavior]; }
}
}
} |
