public AnimationStateMachine(AnimationPackage package)
{
horizMovement = Vector2.Zero;
mSkinningData = package.SkinningData;
// Use the data in the AnimationPackage structure to create states to fill our list and build
// a transition matrix.
states = new Dictionary<string, AnimationState>();
foreach (AnimationStateDescription stateDesc in package.StateDescriptions)
{
AnimationState newState = new AnimationState(stateDesc, package);
states.Add(newState.Name, newState);
}
transitions = new Dictionary<AnimationState, Dictionary<AnimationState, TransitionInfo>>();
foreach (KeyValuePair<string, AnimationState> currentStateKvp in states)
{
transitions.Add(currentStateKvp.Value, new Dictionary<AnimationState, TransitionInfo>());
foreach (KeyValuePair<string, AnimationState> nextStateKvp in states)
{
TransitionInfo bestFitTransition = null;
foreach (TransitionInfo ti in package.Transitions)
{
// The items lower in the list are higher priority and will override previous matches.
if (ti.IsMatch(currentStateKvp.Key, nextStateKvp.Key))
bestFitTransition = ti;
}
transitions[currentStateKvp.Value].Add(nextStateKvp.Value, bestFitTransition);
}
}
CurrentState = states[package.InitialStateName];
desiredState = CurrentState;
ActiveTransition = null;
nextState = null;
blendFromCancelledTransitionPose = false;
ActiveControlEvents = AnimationControlEvents.None;
}
/// <summary>
/// Advance the currently playing clips, transitions, etc, and return any metachannel events that
/// have occurred during the elapsed time.
/// </summary>
/// <param name="gameTime"></param>
/// <returns></returns>
public void Update(GameTime gameTime)
{
ActiveControlEvents = AnimationControlEvents.None;
if (ActiveTransition == null ||
(transitionTime == TimeSpan.Zero && !CurrentState.CanTransitionOut()))
{
// We're either completely in a given state, or we can't begin the transition just yet.
CurrentState.AdvanceTime(gameTime.ElapsedGameTime);
ActiveControlEvents |= CurrentState.GetActiveControlEvents();
}
else
{
// A transition is in progress.
if (ActiveTransition.Type != TransitionType.Frozen)
{
CurrentState.AdvanceTime(gameTime.ElapsedGameTime);
ActiveControlEvents |= CurrentState.GetActiveControlEvents();
}
nextState.AdvanceTime(gameTime.ElapsedGameTime);
ActiveControlEvents |= nextState.GetActiveControlEvents();
transitionTime += gameTime.ElapsedGameTime;
// Has the transition completed?
if (transitionTime.TotalSeconds >= ActiveTransition.DurationInSeconds)
{
CurrentState = nextState;
blendFromCancelledTransitionPose = false;
if (nextState != desiredState)
{
nextState = desiredState;
}
else
{
nextState = null;
}
UpdateTransition();
}
}
}
