351 lines
11 KiB
C++
351 lines
11 KiB
C++
//=============================================================================
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// MuseScore
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// Music Composition & Notation
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//
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// Copyright (C) 2007-2011 Werner Schweer
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2
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// as published by the Free Software Foundation and appearing in
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// the file LICENCE.GPL
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//
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// This code is from Qt implementation of QGraphicsItem
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// Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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//=============================================================================
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#include "bsp.h"
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#include "element.h"
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namespace Ms {
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//---------------------------------------------------------
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// InsertItemBspTreeVisitor
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//---------------------------------------------------------
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class InsertItemBspTreeVisitor : public BspTreeVisitor
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{
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public:
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Element* item;
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inline void visit(QList<Element*> *items) { items->prepend(item); }
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};
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//---------------------------------------------------------
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// RemoveItemBspTreeVisitor
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//---------------------------------------------------------
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class RemoveItemBspTreeVisitor : public BspTreeVisitor
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{
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public:
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Element* item;
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inline void visit(QList<Element*> *items) { items->removeAll(item); }
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};
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//---------------------------------------------------------
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// FindItemBspTreeVisitor
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//---------------------------------------------------------
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class FindItemBspTreeVisitor : public BspTreeVisitor
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{
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public:
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QList<Element*> foundItems;
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void visit(QList<Element*>* items) {
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for (int i = 0; i < items->size(); ++i) {
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Element* item = items->at(i);
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if (!item->itemDiscovered) {
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item->itemDiscovered = true;
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foundItems.prepend(item);
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}
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}
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}
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};
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//---------------------------------------------------------
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// BspTree
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//---------------------------------------------------------
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BspTree::BspTree()
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: leafCnt(0)
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{
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depth = 0;
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}
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//---------------------------------------------------------
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// intmaxlog
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//---------------------------------------------------------
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static inline int intmaxlog(int n)
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{
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return (n > 0 ? qMax(int(::ceil(::log(qreal(n))/::log(qreal(2)))), 5) : 0);
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}
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//---------------------------------------------------------
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// initialize
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//---------------------------------------------------------
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void BspTree::initialize(const QRectF& rect, int n)
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{
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depth = intmaxlog(n);
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this->rect = rect;
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leafCnt = 0;
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nodes.resize((1 << (depth+1)) - 1);
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leaves.resize(1 << depth);
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leaves.fill(QList<Element*>());
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initialize(rect, depth, 0);
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}
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//---------------------------------------------------------
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// clear
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//---------------------------------------------------------
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void BspTree::clear()
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{
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leafCnt = 0;
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nodes.clear();
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leaves.clear();
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}
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//---------------------------------------------------------
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// insert
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//---------------------------------------------------------
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void BspTree::insert(Element* element)
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{
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InsertItemBspTreeVisitor insertVisitor;
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insertVisitor.item = element;
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climbTree(&insertVisitor, element->pageBoundingRect());
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}
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//---------------------------------------------------------
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// remove
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//---------------------------------------------------------
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void BspTree::remove(Element* element)
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{
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RemoveItemBspTreeVisitor removeVisitor;
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removeVisitor.item = element;
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climbTree(&removeVisitor, element->pageBoundingRect());
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}
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//---------------------------------------------------------
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// items
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//---------------------------------------------------------
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QList<Element*> BspTree::items(const QRectF& rect)
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{
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FindItemBspTreeVisitor findVisitor;
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climbTree(&findVisitor, rect);
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QList<Element*> l;
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for (Element * e : findVisitor.foundItems) {
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e->itemDiscovered = false;
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if (e->pageBoundingRect().intersects(rect))
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l.append(e);
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}
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return l;
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}
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//---------------------------------------------------------
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// items
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//---------------------------------------------------------
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QList<Element*> BspTree::items(const QPointF& pos)
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{
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FindItemBspTreeVisitor findVisitor;
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climbTree(&findVisitor, pos);
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QList<Element*> l;
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for (Element* e : findVisitor.foundItems) {
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e->itemDiscovered = false;
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if (e->contains(pos))
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l.append(e);
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}
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return l;
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}
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#ifndef NDEBUG
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//---------------------------------------------------------
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// debug
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//---------------------------------------------------------
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QString BspTree::debug(int index) const
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{
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const Node* node = &nodes.at(index);
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QString tmp;
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if (node->type == Node::Type::LEAF) {
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QRectF rect = rectForIndex(index);
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if (!leaves[node->leafIndex].empty()) {
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tmp += QString::fromLatin1("[%1, %2, %3, %4] contains %5 items\n")
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.arg(rect.left()).arg(rect.top())
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.arg(rect.width()).arg(rect.height())
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.arg(leaves[node->leafIndex].size());
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}
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}
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else {
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if (node->type == Node::Type::HORIZONTAL) {
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tmp += debug(firstChildIndex(index));
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tmp += debug(firstChildIndex(index) + 1);
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}
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else {
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tmp += debug(firstChildIndex(index));
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tmp += debug(firstChildIndex(index) + 1);
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}
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}
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return tmp;
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}
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#endif
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//---------------------------------------------------------
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// initialize
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//---------------------------------------------------------
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void BspTree::initialize(const QRectF& rect, int depth, int index)
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{
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Node* node = &nodes[index];
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if (index == 0) {
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node->type = Node::Type::HORIZONTAL;
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node->offset = rect.center().x();
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}
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if (depth) {
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Node::Type type;
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QRectF rect1, rect2;
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qreal offset1, offset2;
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if (node->type == Node::Type::HORIZONTAL) {
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type = Node::Type::VERTICAL;
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rect1.setRect(rect.left(), rect.top(), rect.width(), rect.height() * .5);
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rect2.setRect(rect1.left(), rect1.bottom(), rect1.width(), rect.height() - rect1.height());
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offset1 = rect1.center().x();
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offset2 = rect2.center().x();
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}
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else {
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type = Node::Type::HORIZONTAL;
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rect1.setRect(rect.left(), rect.top(), rect.width() * .5, rect.height());
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rect2.setRect(rect1.right(), rect1.top(), rect.width() - rect1.width(), rect1.height());
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offset1 = rect1.center().y();
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offset2 = rect2.center().y();
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}
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int childIndex = firstChildIndex(index);
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Node* child = &nodes[childIndex];
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child->offset = offset1;
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child->type = type;
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child = &nodes[childIndex + 1];
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child->offset = offset2;
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child->type = type;
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initialize(rect1, depth - 1, childIndex);
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initialize(rect2, depth - 1, childIndex + 1);
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}
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else {
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node->type = Node::Type::LEAF;
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node->leafIndex = leafCnt++;
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}
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}
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//---------------------------------------------------------
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// climbTree
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//---------------------------------------------------------
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void BspTree::climbTree(BspTreeVisitor* visitor, const QPointF& pos, int index)
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{
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if (nodes.empty())
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return;
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Node* node = &nodes[index];
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int childIndex = firstChildIndex(index);
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switch (node->type) {
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case Node::Type::LEAF:
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visitor->visit(&leaves[node->leafIndex]);
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break;
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case Node::Type::VERTICAL:
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if (pos.x() < node->offset)
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climbTree(visitor, pos, childIndex);
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else
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climbTree(visitor, pos, childIndex + 1);
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break;
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case Node::Type::HORIZONTAL:
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if (pos.y() < node->offset)
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climbTree(visitor, pos, childIndex);
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else
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climbTree(visitor, pos, childIndex + 1);
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break;
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}
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}
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//---------------------------------------------------------
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// climbTree
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//---------------------------------------------------------
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void BspTree::climbTree(BspTreeVisitor* visitor, const QRectF& rect, int index)
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{
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if (nodes.empty())
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return;
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Node* node = &nodes[index];
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int childIndex = firstChildIndex(index);
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switch (node->type) {
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case Node::Type::LEAF:
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visitor->visit(&leaves[node->leafIndex]);
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break;
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case Node::Type::VERTICAL:
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if (rect.left() < node->offset) {
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climbTree(visitor, rect, childIndex);
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if (rect.right() >= node->offset)
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climbTree(visitor, rect, childIndex + 1);
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}
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else {
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climbTree(visitor, rect, childIndex + 1);
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}
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break;
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case Node::Type::HORIZONTAL:
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int childIndex = firstChildIndex(index);
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if (rect.top() < node->offset) {
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climbTree(visitor, rect, childIndex);
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if (rect.bottom() >= node->offset)
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climbTree(visitor, rect, childIndex + 1);
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}
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else {
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climbTree(visitor, rect, childIndex + 1);
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}
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}
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}
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//---------------------------------------------------------
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// rectForIndex
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//---------------------------------------------------------
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QRectF BspTree::rectForIndex(int index) const
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{
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if (index <= 0)
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return rect;
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int parentIdx = parentIndex(index);
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QRectF rect = rectForIndex(parentIdx);
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const Node *parent = &nodes.at(parentIdx);
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if (parent->type == Node::Type::HORIZONTAL) {
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if (index & 1)
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rect.setRight(parent->offset);
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else
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rect.setLeft(parent->offset);
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}
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else {
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if (index & 1)
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rect.setBottom(parent->offset);
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else
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rect.setTop(parent->offset);
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}
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return rect;
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}
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}
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