/// <summary>
/// Checks if any player is within 20 blocks of the minion. If they are, then this method
/// sets the minion's target to the character and returns true, otherwise it sets the minion's
/// target to null and returns false.
///
/// If the minion can't see any enemies this method will put the minion in an idle time state
/// </summary>
/// <param name="m"></param>
/// <returns></returns>
public bool chooseNextNode(Minion m)
{
//Check if the closest player is within 20 blocks
if (m.containingLevel.players.Count == 0)
{
return false;
}
float dist = Vector3.Distance(Constants.UnconvertFromXNAScene(m.position), Constants.UnconvertFromXNAScene(m.containingLevel.players[0].position));
Character closestPlayer = m.containingLevel.players[0];
//This probably breaks encapsulation
for (int i = 1; i < m.containingLevel.players.Count; ++i)
{
float checkDist = Vector3.Distance(Constants.UnconvertFromXNAScene(m.position), Constants.UnconvertFromXNAScene(m.containingLevel.players[i].position));
if (checkDist < dist)
{
dist = checkDist;
closestPlayer = m.containingLevel.players[i];
}
}
//Enemy out of sight
if (dist / Constants.TILE_SIZE > Constants.MINION_SIGHT)
{
//m.gotoIdleState();
return false;
}
else
{
m.target = closestPlayer;
return true;
}
}
private AI_STATE evaluateTreeRec(Minion m, ADecisionTreeNode root)
{
if (root == null)
{
throw new Exception("The decision tree isn't working properly. We hit a null node");
}
//The tree should only have leaves and 2 child nodes...hopefully
//if (root.isLeaf())
//{
// choice = root.chooseAction(m);
// return false;
//}
//else
//{
// if (root.chooseNextNode(m))
// {
// return evaluateTreeRec(m, root.yes, out choice);
// }
// else
// {
// return evaluateTreeRec(m, root.no, out choice);
// }
//}
AI_STATE result = root.chooseAction(m);
if (result == AI_STATE.NO)
{
return evaluateTreeRec(m, root.no);
}
else if (result == AI_STATE.YES)
{
return evaluateTreeRec(m, root.yes);
}
return result;
}
/// <summary>
/// This method will evaluate if the minion's target is within attacking range. The target must
/// be set by the previous node in the tree (SeeEnemy), otherwise this returns false
/// </summary>
/// <param name="m"></param>
/// <returns></returns>
private bool chooseNextNode(Minion m)
{
if (m.target == null)
{
return false;
}
return (Vector3.Distance(Constants.UnconvertFromXNAScene(m.position), Constants.UnconvertFromXNAScene(m.target.position))) / Constants.TILE_SIZE < Constants.MINION_ATTACK_RANGE;
}
public override AI_STATE chooseAction(Minion m)
{
//If we don't see an enemy, patrol
if (!chooseNextNode(m))
{
return AI_STATE.NO;
}
else
{
return AI_STATE.YES;
}
}
public AI_STATE evaluateTree(Minion m)
{
return evaluateTreeRec(m, root);
}
private bool chooseNextNode(Minion m)
{
return m.lastMoved <= 0;
}
private bool chooseNextNode(Minion m)
{
//We have a path to the target if the queue is not null
//???
return m.pathToTarget.Count != 0;// && !m.closeTo(m.pathToTarget.Peek());
}
public override AI_STATE chooseAction(Minion m)
{
//If we have a path to the target, follow it, otherwise calculate it
return chooseNextNode(m) ? AI_STATE.YES : AI_STATE.NO;
}
/// <summary> /// Call this method when traversing the decision tree, it will tell you whether /// to go left or right, depending on the situation of the level. If this node doesn't /// have any children, then use the result of chooseAction /// </summary> /// <param name="m"></param> /// <returns></returns> //public abstract bool chooseNextNode(Minion m); /// <summary> /// A method that returns the action associated with the given node. If this is /// an internal node it will return either left or right. Otherwise if it's a leaf /// it will return a specific action --HACK-- /// </summary> /// <param name="m"></param> /// <returns></returns> public abstract AI_STATE chooseAction(Minion m);
