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https://github.com/BlackMATov/unity-iso-tools.git
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QuadTree WIP
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269
Assets/IsoTools/Scripts/Internal/IsoQuadTree.cs
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269
Assets/IsoTools/Scripts/Internal/IsoQuadTree.cs
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namespace IsoTools.Internal {
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public class IsoQuadTree<T> {
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const int MinChildCountPerNode = 3;
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//
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// IItem
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//
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public interface IItem {
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}
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//
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// Item
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//
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class Item : IItem {
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public Node Owner = null;
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public IsoRect Bounds = IsoRect.zero;
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public T Content = default(T);
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public Item Init(Node owner, IsoRect bounds, T content) {
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Owner = owner;
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Bounds = bounds;
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Content = content;
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return this;
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}
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public Item Clear() {
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return Init(null, IsoRect.zero, default(T));
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}
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}
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//
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// Node
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//
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class Node {
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public Node Parent = null;
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public IsoRect Bounds = IsoRect.zero;
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public Node[] Children = new Node[4];
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public IsoAssocList<Item> Contents = new IsoAssocList<Item>(MinChildCountPerNode);
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public Node Init(Node parent, IsoRect bounds) {
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Parent = parent;
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Bounds = bounds;
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return this;
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}
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public Node Clear(IsoIPool<Node> node_pool, IsoIPool<Item> item_pool) {
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ClearChildren(node_pool, item_pool);
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ClearContents(item_pool);
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return Init(null, IsoRect.zero);
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}
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public bool Insert(
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IsoRect bounds, T content, out Item item,
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IsoIPool<Node> node_pool, IsoIPool<Item> item_pool)
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{
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if ( !Bounds.Contains(bounds) ) {
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item = null;
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return false;
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}
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bool has_any_children = false;
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for ( int i = 0, e = Children.Length; i < e; ++i ) {
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if ( Children[i] != null ) {
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has_any_children = true;
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if ( Children[i].Insert(bounds, content, out item, node_pool, item_pool) ) {
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return true;
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}
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}
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}
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if ( has_any_children || Contents.Count >= MinChildCountPerNode ) {
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for ( int i = 0, e = Children.Length; i < e; ++i ) {
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if ( Children[i] == null ) {
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var child_bounds = GetChildBounds(i);
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if ( child_bounds.Contains(bounds) ) {
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Children[i] = node_pool.Take().Init(this, child_bounds);
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if ( Children[i].Insert(bounds, content, out item, node_pool, item_pool) ) {
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return true;
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}
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}
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}
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}
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}
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item = item_pool.Take().Init(this, bounds, content);
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Contents.Add(item);
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return true;
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}
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public void VisitAllBounds(System.Action<IsoRect> act) {
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act(Bounds);
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for ( int i = 0, e = Children.Length; i < e; ++i ) {
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if ( Children[i] != null ) {
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Children[i].VisitAllBounds(act);
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}
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}
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}
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public void VisitItemsByBounds(IsoRect bounds, System.Action<T> act) {
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if ( Bounds.Overlaps(bounds) ) {
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for ( int i = 0, e = Contents.Count; i < e; ++i ) {
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act(Contents[i].Content);
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}
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for ( int i = 0, e = Children.Length; i < e; ++i ) {
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if ( Children[i] != null ) {
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Children[i].VisitItemsByBounds(bounds, act);
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}
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}
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}
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}
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//
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// Private
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//
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IsoRect GetChildBounds(int index) {
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var size = Bounds.size * 0.5f;
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var center = Bounds.center;
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switch ( index ) {
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case 0: { // LT
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return new IsoRect(center - size, center);
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}
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case 1: { // RT
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var rect = new IsoRect(center - size, center);
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rect.Translate(size.x, 0.0f);
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return rect;
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}
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case 2: { // LB
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var rect = new IsoRect(center, center + size);
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rect.Translate(-size.x, 0.0f);
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return rect;
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}
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case 3: { // RB
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return new IsoRect(center, center + size);
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}
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default:
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return IsoRect.zero;
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}
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}
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void ClearChildren(IsoIPool<Node> node_pool, IsoIPool<Item> item_pool) {
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for ( int i = 0, e = Children.Length; i < e; ++i ) {
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if ( Children[i] != null ) {
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node_pool.Release(
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Children[i].Clear(node_pool, item_pool));
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}
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}
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System.Array.Clear(Children, 0, Children.Length);
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}
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void ClearContents(IsoIPool<Item> item_pool) {
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for ( int i = 0, e = Contents.Count; i < e; ++i ) {
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item_pool.Release(
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Contents[i].Clear());
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}
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Contents.Clear();
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}
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}
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//
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// NodePool
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//
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class NodePool : IsoPool<Node> {
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public NodePool(int capacity) : base(capacity) {
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}
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public override Node CreateItem() {
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return new Node();
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}
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}
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//
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// ItemPool
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//
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class ItemPool : IsoPool<Item> {
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public ItemPool(int capacity) : base(capacity) {
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}
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public override Item CreateItem() {
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return new Item();
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}
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}
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//
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// Members
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//
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Node _root = null;
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IsoIPool<Node> _nodePool = null;
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IsoIPool<Item> _itemPool = null;
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//
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// Public
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//
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public IsoQuadTree(int capacity) {
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_root = null;
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_nodePool = new NodePool(capacity);
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_itemPool = new ItemPool(capacity);
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}
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public IItem Insert(IsoRect bounds, T content) {
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if ( _root == null ) {
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var initial_bounds = new IsoRect(
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bounds.center - bounds.size * 2.0f,
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bounds.center + bounds.size * 2.0f);
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_root = _nodePool.Take().Init(null, initial_bounds);
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}
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Item item;
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while ( !_root.Insert(bounds, content, out item, _nodePool, _itemPool) ) {
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GrowUp(
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bounds.center.x < _root.Bounds.center.x,
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bounds.center.y < _root.Bounds.center.y);
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}
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return item;
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}
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public void Clear() {
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if ( _root != null ) {
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_nodePool.Release(
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_root.Clear(_nodePool, _itemPool));
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_root = null;
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}
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}
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public void VisitAllBounds(System.Action<IsoRect> act) {
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if ( _root != null ) {
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_root.VisitAllBounds(act);
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}
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}
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public void VisitItemsByBounds(IsoRect bounds, System.Action<T> act) {
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if ( _root != null ) {
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_root.VisitItemsByBounds(bounds, act);
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}
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}
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//
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// Private
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//
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void GrowUp(bool left, bool top) {
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var new_root_bounds = _root.Bounds;
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new_root_bounds.Translate(
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left ? -_root.Bounds.size.x : 0.0f,
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top ? -_root.Bounds.size.y : 0.0f);
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new_root_bounds.Resize(_root.Bounds.size * 2.0f);
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var new_root = _nodePool.Take().Init(null, new_root_bounds);
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if ( left ) {
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if ( top ) {
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new_root.Children[3] = _root;
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} else {
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new_root.Children[1] = _root;
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}
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} else {
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if ( top ) {
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new_root.Children[2] = _root;
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} else {
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new_root.Children[0] = _root;
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}
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}
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_root.Parent = new_root;
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_root = new_root;
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}
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}
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}
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