Exemple #1
0
        /// <summary>
        /// Handles item movement
        /// </summary>
        /// <param name="item">The item that moved</param>
        public void ItemMove(QuadTreePositionItem <T> item)
        {
            // Find the item
            if (Items.Contains(item))
            {
                int i = Items.IndexOf(item);

                // Try to push the item down to the child
                if (!PushItemDown(i))
                {
                    // otherwise, if not root, push up
                    if (ParentNode != null)
                    {
                        PushItemUp(i);
                    }
                    else if (!ContainsRect(item.Rect))
                    {
                        WorldResize(new DRect(
                                        Vector2.Min(Rect.TopLeft, item.Rect.TopLeft) * 2,
                                        Vector2.Max(Rect.BottomRight, item.Rect.BottomRight) * 2));
                    }
                }
            }
            else
            {
                // this node doesn't contain that item, stop notifying it about it
                item.Move -= new QuadTreePositionItem <T> .MoveHandler(ItemMove);
            }
        }
Exemple #2
0
        /// <summary>
        /// Push an item up to this node's parent
        /// </summary>
        /// <param name="i">The index of the item to push up</param>
        public void PushItemUp(int i)
        {
            QuadTreePositionItem <T> m = Items[i];

            RemoveItem(i);
            ParentNode.Insert(m);
        }
Exemple #3
0
        /// <summary>
        /// Inserts an item into one of this node's children
        /// </summary>
        /// <param name="item">The item to insert in a child</param>
        /// <returns>Whether or not the insert succeeded</returns>
        protected bool InsertInChild(QuadTreePositionItem <T> item)
        {
            if (!IsPartitioned)
            {
                return(false);                       // If not partitioned return false
            }
            if (TopLeftNode.ContainsRect(item.Rect)) // Partitioned = Knoten hat unterknoten und keine eigenen PositionItems
            {
                TopLeftNode.Insert(item);
            }
            else if (TopRightNode.ContainsRect(item.Rect))
            {
                TopRightNode.Insert(item);
            }
            else if (BottomLeftNode.ContainsRect(item.Rect))
            {
                BottomLeftNode.Insert(item);
            }
            else if (BottomRightNode.ContainsRect(item.Rect))
            {
                BottomRightNode.Insert(item);
            }

            else
            {
                return(false); // insert in child failed
            }
            return(true);
        }
Exemple #4
0
        /// <summary>
        /// Inserts an item into the QuadTree
        /// </summary>
        /// <param name="item">The item to insert</param>
        /// <remarks>Checks to see if the world needs resizing and does so if needed</remarks>
        public void Insert(QuadTreePositionItem <T> item)
        {
            // check if the world needs resizing
            if (!headNode.ContainsRect(item.Rect))
            {
                Resize(new DRect(
                           Vector2.Min(headNode.Rect.TopLeft, item.Rect.TopLeft) * 2,
                           Vector2.Max(headNode.Rect.BottomRight, item.Rect.BottomRight) * 2));
            }

            headNode.Insert(item);
        }
Exemple #5
0
        /// <summary>
        /// Removes an item from this node
        /// </summary>
        /// <param name="item">The item to remove</param>
        public void RemoveItem(QuadTreePositionItem <T> item)
        {
            // Find and remove the item
            if (Items.Contains(item))
            {
                item.Move -= new QuadTreePositionItem <T> .MoveHandler(ItemMove);

                item.Destroy -= new QuadTreePositionItem <T> .DestroyHandler(ItemDestroy);

                Items.Remove(item);
            }
        }
Exemple #6
0
        public QuadTreePositionItem <T> RemoveItem(T parent, Vector2 position, Vector2 size)
        {
            QuadTreePositionItem <T> item = new QuadTreePositionItem <T>(parent, position, size);

            // check if the world needs resizing
            if (!headNode.ContainsRect(item.Rect))
            {
                Resize(new DRect(
                           Vector2.Min(headNode.Rect.TopLeft, item.Rect.TopLeft) * 2,
                           Vector2.Max(headNode.Rect.BottomRight, item.Rect.BottomRight) * 2));
            }

            headNode.RemoveItem(item);

            return(item);
        }
Exemple #7
0
        /// <summary>
        /// Insert an item in this node
        /// </summary>
        /// <param name="item">The item to insert</param>
        public void Insert(QuadTreePositionItem <T> item)
        {
            // If partitioned, try to find child node to add to
            if (!InsertInChild(item))
            {
                item.Destroy += new QuadTreePositionItem <T> .DestroyHandler(ItemDestroy);

                item.Move += new QuadTreePositionItem <T> .MoveHandler(ItemMove);

                Items.Add(item);

                // Check if this node needs to be partitioned
                if (!IsPartitioned && Items.Count >= MaxItems)
                {
                    Partition();
                }
            }
        }
Exemple #8
0
        /// <summary>
        /// Finds the node containing a specified item
        /// </summary>
        /// <param name="Item">The item to find</param>
        /// <returns>The node containing the item</returns>
        public QuadTreeNode <T> FindItemNode(QuadTreePositionItem <T> Item)
        {
            if (Items.Contains(Item))
            {
                return(this);
            }

            else if (IsPartitioned)
            {
                QuadTreeNode <T> n = null;

                // Check the nodes that could contain the item
                if (TopLeftNode.ContainsRect(Item.Rect))
                {
                    n = TopLeftNode.FindItemNode(Item);
                }
                if (n == null &&
                    TopRightNode.ContainsRect(Item.Rect))
                {
                    n = TopRightNode.FindItemNode(Item);
                }
                if (n == null &&
                    BottomLeftNode.ContainsRect(Item.Rect))
                {
                    n = BottomLeftNode.FindItemNode(Item);
                }
                if (n == null &&
                    BottomRightNode.ContainsRect(Item.Rect))
                {
                    n = BottomRightNode.FindItemNode(Item);
                }

                return(n);
            }

            else
            {
                return(null);
            }
        }
Exemple #9
0
 /// <summary>
 /// Handles item destruction
 /// </summary>
 /// <param name="item">The item that is being destroyed</param>
 public void ItemDestroy(QuadTreePositionItem <T> item)
 {
     RemoveItem(item);
 }