instancetree.cpp

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/***************************************************************************
 *   Copyright (C) 2005-2019 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
 *   This file is part of FIFE.                                            *
 *                                                                         *
 *   FIFE is free software; you can redistribute it and/or                 *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
 *                                                                         *
 *   This library is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

// Standard C++ library includes

// 3rd party library includes


// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "util/base/exception.h"
#include "util/log/logger.h"
#include "model/structures/instance.h"
#include "util/structures/rect.h"

#include "instancetree.h"


namespace FIFE {
    static Logger _log(LM_STRUCTURES);

    InstanceTree::InstanceTree(): FifeClass() {
    }

    InstanceTree::~InstanceTree() {
    }

    void InstanceTree::addInstance(Instance* instance) {
        ModelCoordinate coords = instance->getLocationRef().getLayerCoordinates();
        InstanceTreeNode * node = m_tree.find_container(coords.x,coords.y,0,0);
        InstanceList& list = node->data();
        list.push_back(instance);
        if( m_reverse.find(instance) != m_reverse.end() ) {
            FL_WARN(_log, "InstanceTree::addInstance() - Duplicate Instance.  Ignoring.");
            return;
        }
        m_reverse[instance] = node;
    }

    void InstanceTree::removeInstance(Instance* instance) {
        InstanceTreeNode * node = m_reverse[instance];
        if( !node ) {
            FL_WARN(_log, "InstanceTree::removeInstance() - Instance not part of tree.");
            return;
        }
        m_reverse.erase(instance);
        InstanceList& list = node->data();
        for(InstanceList::iterator i = list.begin(); i != list.end(); ++i) {
            if((*i) == instance) {
                list.erase(i);
                return;
            }
        }
        FL_WARN(_log, "InstanceTree::removeInstance() - Instance part of tree but not found in the expected tree node.");
    }

    class InstanceListCollector {
        public:
            InstanceTree::InstanceList& instanceList;
            Rect searchRect;
            InstanceListCollector(InstanceTree::InstanceList& a_instanceList, const Rect& rect)
            : instanceList(a_instanceList), searchRect(rect) {
            }
            bool visit(InstanceTree::InstanceTreeNode* node, int32_t d);
    };

    bool InstanceListCollector::visit(InstanceTree::InstanceTreeNode* node, int32_t d) {
        InstanceTree::InstanceList& list = node->data();
        for(InstanceTree::InstanceList::const_iterator it(list.begin()); it != list.end(); ++it) {
            ModelCoordinate coords = (*it)->getLocationRef().getLayerCoordinates();
            if( searchRect.contains(Point(coords.x,coords.y)) ) {
                instanceList.push_back(*it);
            }
        }
        return true;
    }

    void InstanceTree::findInstances(const ModelCoordinate& point, int32_t w, int32_t h, InstanceTree::InstanceList& list) {
        list.clear();
        InstanceTreeNode * node = m_tree.find_container(point.x, point.y, w, h);
        Rect rect(point.x, point.y, w, h);
        InstanceListCollector collector(list,rect);

        node->apply_visitor(collector);

        node = node->parent();
        while( node ) {
            for(InstanceList::const_iterator it(node->data().begin()); it != node->data().end(); ++it) {
                ModelCoordinate coords = (*it)->getLocationRef().getLayerCoordinates();
                if( rect.contains(Point(coords.x,coords.y)) ) {
                    list.push_back(*it);
                }
            }
            node = node->parent();
        }
    }

}