1 files changed, 145 insertions, 0 deletions
diff --git a/src/widgets/itemviews/qbsptree.cpp b/src/widgets/itemviews/qbsptree.cpp
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+++ b/src/widgets/itemviews/qbsptree.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qbsptree_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QBspTree::QBspTree() : depth(6), visited(0) {}
+
+void QBspTree::create(int n, int d)
+{
+    // simple heuristics to find the best tree depth
+    if (d == -1) {
+        int c;
+        for (c = 0; n; ++c)
+            n = n / 10;
+        depth = c << 1;
+    } else {
+        depth = d;
+    }
+    depth = qMax(depth, uint(1));
+
+    nodes.resize((1 << depth) - 1); // resize to number of nodes
+    leaves.resize(1 << depth); // resize to number of leaves
+}
+
+void QBspTree::destroy()
+{
+    leaves.clear();
+    nodes.clear();
+}
+
+void QBspTree::climbTree(const QRect &rect, callback *function, QBspTreeData data)
+{
+    if (nodes.isEmpty())
+        return;
+    ++visited;
+    climbTree(rect, function, data, 0);
+}
+
+void QBspTree::climbTree(const QRect &area, callback *function, QBspTreeData data, int index)
+{
+    if (index >= nodes.count()) { // the index points to a leaf
+        Q_ASSERT(!nodes.isEmpty());
+        function(leaf(index - nodes.count()), area, visited, data);
+        return;
+    }
+
+    Node::Type t = (Node::Type) nodes.at(index).type;
+
+    int pos = nodes.at(index).pos;
+    int idx = firstChildIndex(index);
+    if (t == Node::VerticalPlane) {
+        if (area.left() < pos)
+            climbTree(area, function, data, idx); // back
+        if (area.right() >= pos)
+            climbTree(area, function, data, idx + 1); // front
+    } else {
+        if (area.top() < pos)
+            climbTree(area, function, data, idx); // back
+        if (area.bottom() >= pos)
+            climbTree(area, function, data, idx + 1); // front
+    }
+}
+
+void QBspTree::init(const QRect &area, int depth, NodeType type, int index)
+{
+    Node::Type t = Node::None; // t should never have this value
+    if (type == Node::Both) // if both planes are specified, use 2d bsp
+        t = (depth & 1) ? Node::HorizontalPlane : Node::VerticalPlane;
+    else
+        t = type;
+    QPoint center = area.center();
+    nodes[index].pos = (t == Node::VerticalPlane ? center.x() : center.y());
+    nodes[index].type = t;
+
+    QRect front = area;
+    QRect back = area;
+
+    if (t == Node::VerticalPlane) {
+        front.setLeft(center.x());
+        back.setRight(center.x() - 1); // front includes the center
+    } else { // t == Node::HorizontalPlane
+        front.setTop(center.y());
+        back.setBottom(center.y() - 1);
+    }
+
+    int idx = firstChildIndex(index);
+    if (--depth) {
+        init(back, depth, type, idx);
+        init(front, depth, type, idx + 1);
+    }
+}
+
+void QBspTree::insert(QVector<int> &leaf, const QRect &, uint, QBspTreeData data)
+{
+    leaf.append(data.i);
+}
+
+void QBspTree::remove(QVector<int> &leaf, const QRect &, uint, QBspTreeData data)
+{
+    int i = leaf.indexOf(data.i);
+    if (i != -1)
+        leaf.remove(i);
+}
+
+QT_END_NAMESPACE