mirror of
https://github.com/NGSolve/netgen.git
synced 2024-12-24 21:10:33 +05:00
Replace BoxTree with BTree
This commit is contained in:
Matthias Hochsteger
parent
3e01cac707
commit
ef64a5e7eb
@ -741,55 +741,166 @@ public:
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const ADTree3 & Tree() const { return *tree; };
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};
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template <int dim, typename T = INDEX>
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template<int dim, typename T=INDEX>
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class BoxTree
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{
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T_ADTree<2*dim,T> * tree;
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Point<dim> boxpmin, boxpmax;
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public:
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// Number of entries per leaf
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static constexpr int N = 100;
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struct Node;
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struct Leaf
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{
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Point<2*dim> p[N];
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T index[N];
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int n_elements;
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Leaf() : n_elements(0) {}
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void Add( ClosedHashTable<T, Leaf*> &leaf_index, const Point<2*dim> &ap, T aindex )
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{
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p[n_elements] = ap;
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index[n_elements] = aindex;
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n_elements++;
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leaf_index[aindex] = this;
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}
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};
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struct Node
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{
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union
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{
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Node *children[2];
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Leaf *leaf;
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};
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double sep;
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int level;
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Node()
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: children{nullptr,nullptr}
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{ }
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~Node()
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{ }
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Leaf *GetLeaf() const
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{
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return children[1] ? nullptr : leaf;
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}
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};
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private:
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Node root;
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// Array<Leaf*, INDEX> leaf_index;
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ClosedHashTable<T, Leaf*> leaf_index;
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Point<dim> global_min, global_max;
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double tol;
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size_t n_leaves;
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size_t n_nodes;
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BlockAllocator ball_nodes;
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BlockAllocator ball_leaves;
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public:
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BoxTree (const Box<dim> & abox)
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: BoxTree( abox.PMin(), abox.PMax() )
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{ }
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BoxTree (const Point<dim> & pmin, const Point<dim> & pmax)
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: global_min(pmin), global_max(pmax), n_leaves(1), n_nodes(1), ball_nodes(sizeof(Node)), ball_leaves(sizeof(Leaf))
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{
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boxpmin = abox.PMin();
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boxpmax = abox.PMax();
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root.leaf = (Leaf*) ball_leaves.Alloc(); new (root.leaf) Leaf();
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root.level = 0;
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tol = 1e-7 * Dist(pmax, pmin);
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}
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size_t GetNLeaves()
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{
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return n_leaves;
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}
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size_t GetNNodes()
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{
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return n_nodes;
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}
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template<typename TFunc>
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void GetFirstIntersecting (const Point<dim> & pmin, const Point<dim> & pmax,
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TFunc func=[](auto pi){return false;}) const
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{
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// static Timer timer("BTree::GetIntersecting"); RegionTimer rt(timer);
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// static Timer timer1("BTree::GetIntersecting-LinearSearch");
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ArrayMem<const Node*, 100> stack;
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ArrayMem<int, 100> dir_stack;
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Point<2*dim> tpmin, tpmax;
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for (int i = 0; i < dim; i++)
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for (size_t i : IntRange(dim))
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{
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tpmin(i) = tpmin(i+dim) = boxpmin(i);
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tpmax(i) = tpmax(i+dim) = boxpmax(i);
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}
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tree = new T_ADTree<2*dim,T> (tpmin, tpmax);
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}
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tpmin(i) = global_min(i);
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tpmax(i) = pmax(i)+tol;
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BoxTree (const Point<dim> & apmin, const Point<dim> & apmax)
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{
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boxpmin = apmin;
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boxpmax = apmax;
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Point<2*dim> tpmin, tpmax;
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for (int i = 0; i < dim; i++)
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{
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tpmin(i) = tpmin(i+dim) = boxpmin(i);
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tpmax(i) = tpmax(i+dim) = boxpmax(i);
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}
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tree = new T_ADTree<2*dim,T> (tpmin, tpmax);
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}
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~BoxTree ()
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{
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delete tree;
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}
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void Insert (const Point<dim> & bmin, const Point<dim> & bmax, T pi)
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{
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Point<2*dim> tp;
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for (size_t i = 0; i < dim; i++)
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{
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tp(i) = bmin(i);
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tp(i+dim) = bmax(i);
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tpmin(i+dim) = pmin(i)-tol;
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tpmax(i+dim) = global_max(i);
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}
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tree->Insert (tp, pi);
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stack.SetSize(0);
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stack.Append(&root);
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dir_stack.SetSize(0);
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dir_stack.Append(0);
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while(stack.Size())
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{
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const Node *node = stack.Last();
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stack.DeleteLast();
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int dir = dir_stack.Last();
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dir_stack.DeleteLast();
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if(Leaf *leaf = node->GetLeaf())
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{
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// RegionTimer rt1(timer1);
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for (auto i : IntRange(leaf->n_elements))
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{
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bool intersect = true;
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const auto p = leaf->p[i];
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for (int d = 0; d < dim; d++)
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if (p[d] > tpmax[d])
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intersect = false;
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for (int d = dim; d < 2*dim; d++)
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if (p[d] < tpmin[d])
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intersect = false;
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if(intersect)
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if(func(leaf->index[i])) return;
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}
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}
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else
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{
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int newdir = dir+1;
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if(newdir==2*dim) newdir = 0;
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if (tpmin[dir] <= node->sep)
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{
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stack.Append(node->children[0]);
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dir_stack.Append(newdir);
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}
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if (tpmax[dir] >= node->sep)
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{
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stack.Append(node->children[1]);
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dir_stack.Append(newdir);
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}
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}
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}
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}
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void GetIntersecting (const Point<dim> & pmin, const Point<dim> & pmax,
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NgArray<T> & pis) const
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{
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pis.SetSize(0);
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GetFirstIntersecting(pmin, pmax, [&pis](auto pi) { pis.Append(pi); return false;});
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}
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void Insert (const Box<dim> & box, T pi)
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@ -797,34 +908,188 @@ public:
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Insert (box.PMin(), box.PMax(), pi);
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}
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void DeleteElement (T pi)
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void Insert (const Point<dim> & pmin, const Point<dim> & pmax, T pi)
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{
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tree->DeleteElement(pi);
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}
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void GetIntersecting (const Point<dim> & pmin, const Point<dim> & pmax,
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NgArray<T> & pis) const
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{
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Point<2*dim> tpmin, tpmax;
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double tol = Tolerance();
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for (size_t i = 0; i < dim; i++)
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// static Timer timer("BTree::Insert"); RegionTimer rt(timer);
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int dir = 0;
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Point<2*dim> p;
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for (auto i : IntRange(dim))
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{
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tpmin(i) = boxpmin(i);
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tpmax(i) = pmax(i)+tol;
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tpmin(i+dim) = pmin(i)-tol;
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tpmax(i+dim) = boxpmax(i);
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p(i) = pmin[i];
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p(i+dim) = pmax[i];
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}
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tree->GetIntersecting (tpmin, tpmax, pis);
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Node * node = &root;
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Leaf * leaf = node->GetLeaf();
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// search correct leaf to add point
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while(!leaf)
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{
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node = p[dir] < node->sep ? node->children[0] : node->children[1];
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dir++;
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if(dir==2*dim) dir = 0;
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leaf = node->GetLeaf();
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}
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// add point to leaf
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if(leaf->n_elements < N)
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leaf->Add(leaf_index, p,pi);
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else // assume leaf->n_elements == N
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{
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// add two new nodes and one new leaf
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int n_elements = leaf->n_elements;
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ArrayMem<double, N> coords(n_elements);
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ArrayMem<int, N> order(n_elements);
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// separate points in two halves, first sort all coordinates in direction dir
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for (auto i : IntRange(n_elements))
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{
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order[i] = i;
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coords[i] = leaf->p[i][dir];
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}
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QuickSortI(coords, order);
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int isplit = N/2;
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Leaf *leaf1 = (Leaf*) ball_leaves.Alloc(); new (leaf1) Leaf();
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Leaf *leaf2 = (Leaf*) ball_leaves.Alloc(); new (leaf2) Leaf();
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for (auto i : order.Range(isplit))
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leaf1->Add(leaf_index, leaf->p[i], leaf->index[i] );
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for (auto i : order.Range(isplit, N))
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leaf2->Add(leaf_index, leaf->p[i], leaf->index[i] );
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Node *node1 = (Node*) ball_nodes.Alloc(); new (node1) Node();
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node1->leaf = leaf1;
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node1->level = node->level+1;
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Node *node2 = (Node*) ball_nodes.Alloc(); new (node2) Node();
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node2->leaf = leaf2;
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node2->level = node->level+1;
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node->children[0] = node1;
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node->children[1] = node2;
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node->sep = 0.5 * (leaf->p[order[isplit-1]][dir] + leaf->p[order[isplit]][dir]);
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// add new point to one of the new leaves
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if (p[dir] < node->sep)
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leaf1->Add( leaf_index, p, pi );
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else
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leaf2->Add( leaf_index, p, pi );
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ball_leaves.Free(leaf);
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n_leaves++;
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n_nodes+=2;
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}
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}
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void DeleteElement (T pi)
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{
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// static Timer timer("BTree::DeleteElement"); RegionTimer rt(timer);
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Leaf *leaf = leaf_index[pi];
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leaf_index.Delete(pi);
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auto & n_elements = leaf->n_elements;
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auto & index = leaf->index;
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auto & p = leaf->p;
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double Tolerance() const { return 1e-7 * Dist(boxpmax, boxpmin); } // single precision
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const auto & Tree() const { return *tree; };
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auto & Tree() { return *tree; };
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for (auto i : IntRange(n_elements))
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{
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if(index[i] == pi)
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{
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n_elements--;
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if(i!=n_elements)
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{
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index[i] = index[n_elements];
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p[i] = p[n_elements];
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}
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return;
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}
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}
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}
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};
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// template <int dim, typename T = INDEX>
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// class BoxTree
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// {
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// T_ADTree<2*dim,T> * tree;
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// Point<dim> boxpmin, boxpmax;
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// public:
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// BoxTree (const Box<dim> & abox)
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// {
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// boxpmin = abox.PMin();
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// boxpmax = abox.PMax();
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// Point<2*dim> tpmin, tpmax;
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// for (int i = 0; i < dim; i++)
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// {
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// tpmin(i) = tpmin(i+dim) = boxpmin(i);
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// tpmax(i) = tpmax(i+dim) = boxpmax(i);
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// }
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// tree = new T_ADTree<2*dim,T> (tpmin, tpmax);
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// }
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//
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// BoxTree (const Point<dim> & apmin, const Point<dim> & apmax)
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// {
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// boxpmin = apmin;
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// boxpmax = apmax;
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// Point<2*dim> tpmin, tpmax;
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// for (int i = 0; i < dim; i++)
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// {
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// tpmin(i) = tpmin(i+dim) = boxpmin(i);
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// tpmax(i) = tpmax(i+dim) = boxpmax(i);
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// }
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// tree = new T_ADTree<2*dim,T> (tpmin, tpmax);
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// }
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//
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// ~BoxTree ()
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// {
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// delete tree;
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// }
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//
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// void Insert (const Point<dim> & bmin, const Point<dim> & bmax, T pi)
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// {
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// Point<2*dim> tp;
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//
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// for (size_t i = 0; i < dim; i++)
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// {
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// tp(i) = bmin(i);
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// tp(i+dim) = bmax(i);
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// }
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//
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// tree->Insert (tp, pi);
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// }
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//
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// void Insert (const Box<dim> & box, T pi)
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// {
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// Insert (box.PMin(), box.PMax(), pi);
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// }
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//
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// void DeleteElement (T pi)
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// {
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// tree->DeleteElement(pi);
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// }
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//
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// void GetIntersecting (const Point<dim> & pmin, const Point<dim> & pmax,
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// NgArray<T> & pis) const
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// {
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// Point<2*dim> tpmin, tpmax;
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// double tol = Tolerance();
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// for (size_t i = 0; i < dim; i++)
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// {
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// tpmin(i) = boxpmin(i);
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// tpmax(i) = pmax(i)+tol;
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//
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// tpmin(i+dim) = pmin(i)-tol;
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// tpmax(i+dim) = boxpmax(i);
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// }
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//
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// tree->GetIntersecting (tpmin, tpmax, pis);
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// }
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//
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//
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// double Tolerance() const { return 1e-7 * Dist(boxpmax, boxpmin); } // single precision
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// const auto & Tree() const { return *tree; };
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// auto & Tree() { return *tree; };
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// };
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}
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#endif
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@ -5,264 +5,9 @@
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namespace netgen
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{
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template<int dim, typename T=INDEX>
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class BTree
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{
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public:
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// Number of entries per leaf
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static constexpr int N = 100;
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struct Node;
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struct Leaf
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{
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Point<2*dim> p[N];
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T index[N];
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int n_elements;
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Leaf() : n_elements(0) {}
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void Add( Array<Leaf*, INDEX> &leaf_index, const Point<2*dim> &ap, T aindex )
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{
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p[n_elements] = ap;
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index[n_elements] = aindex;
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n_elements++;
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if(leaf_index.Size()<=aindex)
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leaf_index.SetSize(2*aindex);
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leaf_index[aindex] = this;
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}
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};
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struct Node
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{
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union
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{
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Node *children[2];
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Leaf *leaf;
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};
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double sep;
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int level;
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Node()
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: children{nullptr,nullptr}
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{ }
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~Node()
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{ }
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Leaf *GetLeaf() const
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{
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return children[1] ? nullptr : leaf;
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}
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};
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private:
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Node root;
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Array<Leaf*, INDEX> leaf_index;
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Point<dim> global_min, global_max;
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double tol;
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size_t n_leaves;
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size_t n_nodes;
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BlockAllocator ball_nodes;
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BlockAllocator ball_leaves;
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public:
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BTree (const Point<dim> & pmin, const Point<dim> & pmax)
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: global_min(pmin), global_max(pmax), n_leaves(1), n_nodes(1), ball_nodes(sizeof(Node)), ball_leaves(sizeof(Leaf))
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{
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root.leaf = (Leaf*) ball_leaves.Alloc(); new (root.leaf) Leaf();
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root.level = 0;
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tol = 1e-7 * Dist(pmax, pmin);
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}
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size_t GetNLeaves()
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{
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return n_leaves;
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}
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size_t GetNNodes()
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{
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return n_nodes;
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}
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template<typename TFunc>
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void GetFirstIntersecting (const Point<dim> & pmin, const Point<dim> & pmax,
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TFunc func=[](auto pi){return false;}) const
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{
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// static Timer timer("BTree::GetIntersecting"); RegionTimer rt(timer);
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// static Timer timer1("BTree::GetIntersecting-LinearSearch");
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static Array<const Node*> stack(1000);
|
||||
static Array<int> dir_stack(1000);
|
||||
|
||||
|
||||
Point<2*dim> tpmin, tpmax;
|
||||
|
||||
for (size_t i : IntRange(dim))
|
||||
{
|
||||
tpmin(i) = global_min(i);
|
||||
tpmax(i) = pmax(i)+tol;
|
||||
|
||||
tpmin(i+dim) = pmin(i)-tol;
|
||||
tpmax(i+dim) = global_max(i);
|
||||
}
|
||||
|
||||
stack.SetSize(0);
|
||||
stack.Append(&root);
|
||||
dir_stack.SetSize(0);
|
||||
dir_stack.Append(0);
|
||||
|
||||
while(stack.Size())
|
||||
{
|
||||
const Node *node = stack.Last();
|
||||
stack.DeleteLast();
|
||||
|
||||
int dir = dir_stack.Last();
|
||||
dir_stack.DeleteLast();
|
||||
|
||||
if(Leaf *leaf = node->GetLeaf())
|
||||
{
|
||||
// RegionTimer rt1(timer1);
|
||||
for (auto i : IntRange(leaf->n_elements))
|
||||
{
|
||||
bool intersect = true;
|
||||
const auto p = leaf->p[i];
|
||||
|
||||
for (int d = 0; d < dim; d++)
|
||||
if (p[d] > tpmax[d])
|
||||
intersect = false;
|
||||
for (int d = dim; d < 2*dim; d++)
|
||||
if (p[d] < tpmin[d])
|
||||
intersect = false;
|
||||
if(intersect)
|
||||
if(func(leaf->index[i])) return;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
int newdir = dir+1;
|
||||
if(newdir==2*dim) newdir = 0;
|
||||
if (tpmin[dir] <= node->sep)
|
||||
{
|
||||
stack.Append(node->children[0]);
|
||||
dir_stack.Append(newdir);
|
||||
}
|
||||
if (tpmax[dir] >= node->sep)
|
||||
{
|
||||
stack.Append(node->children[1]);
|
||||
dir_stack.Append(newdir);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void GetIntersecting (const Point<dim> & pmin, const Point<dim> & pmax,
|
||||
NgArray<T> & pis) const
|
||||
{
|
||||
pis.SetSize(0);
|
||||
GetFirstIntersecting(pmin, pmax, [&pis](auto pi) { pis.Append(pi); return false;});
|
||||
}
|
||||
|
||||
void Insert (const Point<dim> & pmin, const Point<dim> & pmax, T pi)
|
||||
{
|
||||
// static Timer timer("BTree::Insert"); RegionTimer rt(timer);
|
||||
int dir = 0;
|
||||
Point<2*dim> p;
|
||||
for (auto i : IntRange(dim))
|
||||
{
|
||||
p(i) = pmin[i];
|
||||
p(i+dim) = pmax[i];
|
||||
}
|
||||
|
||||
Node * node = &root;
|
||||
Leaf * leaf = node->GetLeaf();
|
||||
|
||||
// search correct leaf to add point
|
||||
while(!leaf)
|
||||
{
|
||||
node = p[dir] < node->sep ? node->children[0] : node->children[1];
|
||||
dir++;
|
||||
if(dir==2*dim) dir = 0;
|
||||
leaf = node->GetLeaf();
|
||||
}
|
||||
|
||||
// add point to leaf
|
||||
if(leaf->n_elements < N)
|
||||
leaf->Add(leaf_index, p,pi);
|
||||
else // assume leaf->n_elements == N
|
||||
{
|
||||
// add two new nodes and one new leaf
|
||||
int n_elements = leaf->n_elements;
|
||||
ArrayMem<double, N> coords(n_elements);
|
||||
ArrayMem<int, N> order(n_elements);
|
||||
|
||||
// separate points in two halves, first sort all coordinates in direction dir
|
||||
for (auto i : IntRange(n_elements))
|
||||
{
|
||||
order[i] = i;
|
||||
coords[i] = leaf->p[i][dir];
|
||||
}
|
||||
|
||||
QuickSortI(coords, order);
|
||||
int isplit = N/2;
|
||||
Leaf *leaf1 = (Leaf*) ball_leaves.Alloc(); new (leaf1) Leaf();
|
||||
Leaf *leaf2 = (Leaf*) ball_leaves.Alloc(); new (leaf2) Leaf();
|
||||
|
||||
for (auto i : order.Range(isplit))
|
||||
leaf1->Add(leaf_index, leaf->p[i], leaf->index[i] );
|
||||
for (auto i : order.Range(isplit, N))
|
||||
leaf2->Add(leaf_index, leaf->p[i], leaf->index[i] );
|
||||
|
||||
Node *node1 = (Node*) ball_nodes.Alloc(); new (node1) Node();
|
||||
node1->leaf = leaf1;
|
||||
node1->level = node->level+1;
|
||||
|
||||
Node *node2 = (Node*) ball_nodes.Alloc(); new (node2) Node();
|
||||
node2->leaf = leaf2;
|
||||
node2->level = node->level+1;
|
||||
|
||||
node->children[0] = node1;
|
||||
node->children[1] = node2;
|
||||
node->sep = 0.5 * (leaf->p[order[isplit-1]][dir] + leaf->p[order[isplit]][dir]);
|
||||
|
||||
// add new point to one of the new leaves
|
||||
if (p[dir] < node->sep)
|
||||
leaf1->Add( leaf_index, p, pi );
|
||||
else
|
||||
leaf2->Add( leaf_index, p, pi );
|
||||
|
||||
ball_leaves.Free(leaf);
|
||||
n_leaves++;
|
||||
n_nodes+=2;
|
||||
}
|
||||
}
|
||||
|
||||
void DeleteElement (T pi)
|
||||
{
|
||||
// static Timer timer("BTree::DeleteElement"); RegionTimer rt(timer);
|
||||
Leaf *leaf = leaf_index[pi];
|
||||
auto & n_elements = leaf->n_elements;
|
||||
auto & index = leaf->index;
|
||||
auto & p = leaf->p;
|
||||
|
||||
for (auto i : IntRange(n_elements))
|
||||
{
|
||||
if(index[i] == pi)
|
||||
{
|
||||
n_elements--;
|
||||
if(i!=n_elements)
|
||||
{
|
||||
index[i] = index[n_elements];
|
||||
p[i] = p[n_elements];
|
||||
}
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
typedef BTree<3> TBoxTree;
|
||||
// typedef BoxTree<3> TBoxTree;
|
||||
// typedef BTree<3> TBoxTree;
|
||||
typedef BoxTree<3> TBoxTree;
|
||||
|
||||
static const int deltetfaces[][3] =
|
||||
{ { 1, 2, 3 },
|
||||
|
||||
Loading…
Reference in New Issue
Block a user