Exemple #1
0
        ///<summary>
        ///load graph from map data
        ///</summary>
        ///<param name="mapData"></param>
        ///<returns>true if successful</returns>
        public bool Load(MapData mapData)
        {
            Clear();

            //get the number of nodes and read them in
            int numNodes = mapData.NodeList.Count;

            for (int n = 0; n < numNodes; ++n)
            {
                NavGraphNode newNode = new NavGraphNode(mapData.NodeList[n]);

                //when editing graphs (with Buckland's Raven map editor), it's
                //possible to end up with a situation where some of the nodes
                //have been invalidated (their id's set to invalid_node_index).
                //Therefore when a node of index invalid_node_index is
                //encountered, it must still be added.
                if (!GraphNode.IsInvalidIndex(newNode.Index))
                {
                    AddNode(newNode);
                }
                else
                {
                    Nodes.Add(newNode);

                    //make sure an edgelist is added for each node
                    Edges.Add(new LinkedList<NavGraphEdge>());

                    ++NextNodeIndex;
                }
            }

            //now add the edges
            int numEdges = mapData.EdgeList.Count;

            for (int e = 0; e < numEdges; ++e)
            {
                NavGraphEdge nextEdge = new NavGraphEdge(mapData.EdgeList[e]);

                Edges[nextEdge.From].AddLast(nextEdge);
            }

            return true;
        }
        ///<summary>
        ///Checks to see if an entity has moved cells. If so the data structure
        ///is updated accordingly
        ///</summary>
        ///<param name="ent"></param>
        ///<param name="oldPos"></param>
        public void UpdateEntity(NavGraphNode ent, Vector2 oldPos)
        {
            //if the index for the old pos and the new pos are not equal then
            //the entity has moved to another cell.
            int oldIdx = PositionToIndex(oldPos);
            int newIdx = PositionToIndex(ent.Position);

            if (newIdx == oldIdx) return;

            //the entity has moved into another cell so delete from current
            //cell and add to new one
            Cells[oldIdx].Members.Remove(ent);
            Cells[newIdx].Members.Add(ent);
        }
Exemple #3
0
        ///<summary>
        ///Given a node this method first checks to see if the node has been
        ///added previously but is now inactive. If it is, it is reactivated.
        ///
        ///If the node has not been added previously, it is checked to make
        ///sure its index matches the next node index before being added to
        ///the graph
        ///</summary>
        ///<param name="node"></param>
        ///<returns></returns>
        public int AddNode(NavGraphNode node)
        {
            if (node.Index < Nodes.Count)
            {
                //make sure the client is not trying to add a node with the same
                //Id as a currently active node
                Assert.Fatal(GraphNode.IsInvalidIndex(Nodes[node.Index].Index),
                             "SparseGraph.AddNode: Attempting to add a node with a duplicate Id");

                Nodes[node.Index] = node;

                return NextNodeIndex;
            }

            //make sure the new node has been indexed correctly
            Assert.Fatal(node.Index == NextNodeIndex,
                         "SparseGraph.AddNode: invalid index");

            Nodes.Add(node);
            Edges.Add(new LinkedList<NavGraphEdge>());

            return NextNodeIndex++;
        }
        ///<summary>
        ///Used to add the entities to the data structure
        ///</summary>
        ///<param name="ent"></param>
        public void AddEntity(NavGraphNode ent)
        {
            Assert.Fatal(ent != null,
                         "CellSpacePartition.AddEntity: ent is null");

            if (ent == null)
                return;

            int idx = PositionToIndex(ent.Position);
            Cells[idx].Members.Add(ent);
        }