71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
#pragma once
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#include <array>
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#include <extra2d/spatial/spatial_index.h>
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namespace extra2d {
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class QuadTree : public ISpatialIndex {
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public:
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static constexpr int MAX_OBJECTS = 10;
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static constexpr int MAX_LEVELS = 5;
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struct QuadTreeNode {
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Rect bounds;
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int level;
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std::vector<std::pair<Node *, Rect>> objects;
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std::array<std::unique_ptr<QuadTreeNode>, 4> children;
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QuadTreeNode(const Rect &bounds, int level);
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bool contains(const Rect &rect) const;
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bool intersects(const Rect &rect) const;
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};
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explicit QuadTree(const Rect &worldBounds);
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~QuadTree() override = default;
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void insert(Node *node, const Rect &bounds) override;
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void remove(Node *node) override;
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void update(Node *node, const Rect &newBounds) override;
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std::vector<Node *> query(const Rect &area) const override;
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std::vector<Node *> query(const Vec2 &point) const override;
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std::vector<std::pair<Node *, Node *>> queryCollisions() const override;
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void clear() override;
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size_t size() const override;
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bool empty() const override;
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void rebuild() override;
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private:
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void split(QuadTreeNode *node);
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void insertIntoNode(QuadTreeNode *node, Node *object, const Rect &bounds);
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void queryNode(const QuadTreeNode *node, const Rect &area,
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std::vector<Node *> &results) const;
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void queryNode(const QuadTreeNode *node, const Vec2 &point,
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std::vector<Node *> &results) const;
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void
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collectCollisions(const QuadTreeNode *node,
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std::vector<std::pair<Node *, Node *>> &collisions) const;
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bool removeFromNode(QuadTreeNode *node, Node *object);
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/**
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* @brief 使用扫描线算法检测节点内对象的碰撞
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* @param objects 对象列表
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* @param collisions 输出碰撞对
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*/
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void detectCollisionsInNode(
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const std::vector<std::pair<Node *, Rect>> &objects,
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std::vector<std::pair<Node *, Node *>> &collisions) const;
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std::unique_ptr<QuadTreeNode> root_;
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Rect worldBounds_;
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size_t objectCount_ = 0;
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// 碰撞检测用的临时缓冲区，避免重复分配
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mutable std::vector<std::pair<Node *, Rect>> collisionBuffer_;
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};
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} // namespace extra2d
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