private static IEnumerable <ADecisionNode> createMoveToEntityTree(DecisionTree p_aiDecisionTree, ADecisionNode p_rootNode, Entity p_sourceEntity, Entity p_targetEntity)
{
MoveToEntityNode l_moveToEntityNode = MoveToEntityNode.alloc(p_sourceEntity, p_targetEntity);
DecisionTree.linkDecisionNodes(p_aiDecisionTree, p_rootNode, l_moveToEntityNode);
return(createMoveToNavigationNodesLink(p_aiDecisionTree, l_moveToEntityNode));
}
/// <summary>
/// Calculates all possibilities to move next to the Entity provided by <paramref name="p_moveToEntityNode"/>.
/// </summary>
private static IEnumerable <ADecisionNode> createMoveToNavigationNodesLink(DecisionTree p_aiDecisionTree, MoveToEntityNode p_moveToEntityNode)
{
var l_reachableNavigationNodes =
NavigationGraphAlgorithm.getReachableNeighborNavigationNodes(
NavigationGraphContainer.UniqueNavigationGraph,
p_moveToEntityNode.TargetEntity.CurrentNavigationNode,
NavigationGraphFlag.CURRENT).GetEnumerator();
while (l_reachableNavigationNodes.MoveNext())
{
MoveToNavigationNodeNode l_moveToNavigationNodeNode = MoveToNavigationNodeNode.alloc(p_moveToEntityNode.SourceEntity.CurrentNavigationNode, l_reachableNavigationNodes.Current);
DecisionTree.linkDecisionNodes(p_aiDecisionTree, p_moveToEntityNode, l_moveToNavigationNodeNode);
yield return(l_moveToNavigationNodeNode);
}
/* If the source entity is already a neighbor of the target entity, we still create a node to move to same position to simulate the fact of staying at the same position. */
if (NavigationGraphAlgorithm.areNavigationNodesNeighbors(
NavigationGraphContainer.UniqueNavigationGraph,
p_moveToEntityNode.SourceEntity.CurrentNavigationNode,
p_moveToEntityNode.TargetEntity.CurrentNavigationNode,
NavigationGraphFlag.SNAPSHOT))
{
MoveToNavigationNodeNode l_moveToNavigationNodeNode = MoveToNavigationNodeNode.alloc(p_moveToEntityNode.SourceEntity.CurrentNavigationNode, p_moveToEntityNode.SourceEntity.CurrentNavigationNode);
DecisionTree.linkDecisionNodes(p_aiDecisionTree, p_moveToEntityNode, l_moveToNavigationNodeNode);
yield return(l_moveToNavigationNodeNode);
}
}
