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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QBSPTREE_P_H
#define QBSPTREE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <qvector.h>
#include <qrect.h>
QT_BEGIN_NAMESPACE
class QBspTree
{
public:
struct Node
{
enum Type { None = 0, VerticalPlane = 1, HorizontalPlane = 2, Both = 3 };
inline Node() : pos(0), type(None) {}
int pos;
Type type;
};
typedef Node::Type NodeType;
struct Data
{
Data(void *p) : ptr(p) {}
Data(int n) : i(n) {}
union {
void *ptr;
int i;
};
};
typedef QBspTree::Data QBspTreeData;
typedef void callback(QVector<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
QBspTree();
void create(int n, int d = -1);
void destroy();
inline void init(const QRect &area, NodeType type) { init(area, depth, type, 0); }
void climbTree(const QRect &rect, callback *function, QBspTreeData data);
inline int leafCount() const { return leaves.count(); }
inline QVector<int> &leaf(int i) { return leaves[i]; }
inline void insertLeaf(const QRect &r, int i) { climbTree(r, &insert, i, 0); }
inline void removeLeaf(const QRect &r, int i) { climbTree(r, &remove, i, 0); }
protected:
void init(const QRect &area, int depth, NodeType type, int index);
void climbTree(const QRect &rect, callback *function, QBspTreeData data, int index);
inline int parentIndex(int i) const { return (i & 1) ? ((i - 1) / 2) : ((i - 2) / 2); }
inline int firstChildIndex(int i) const { return ((i * 2) + 1); }
static void insert(QVector<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
static void remove(QVector<int> &leaf, const QRect &area, uint visited, QBspTreeData data);
private:
uint depth;
mutable uint visited;
QVector<Node> nodes;
mutable QVector< QVector<int> > leaves; // the leaves are just indices into the items
};
QT_END_NAMESPACE
#endif // QBSPTREE_P_H
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