shape_index.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * @author Jacobo Aragunde Pérez
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef __SHAPE_INDEX_H
#define __SHAPE_INDEX_H

#include <vector>
#include <geometry/shape.h>
#include <geometry/rtree.h>


template <class T>
static const SHAPE* shapeFunctor( T aItem )
{
    return aItem->Shape();
}

template <class T>
BOX2I boundingBox( T aObject )
{
    return shapeFunctor( aObject )->BBox();
}

template <class T, class V>
void acceptVisitor( T aObject, V aVisitor )
{
    aVisitor( aObject );
}

template <class T, class U>
bool collide( T aObject, U aAnotherObject, int aMinDistance )
{
    return shapeFunctor( aObject )->Collide( aAnotherObject, aMinDistance );
}

template <class T, class V>
bool queryCallback( T aShape, void* aContext )
{
    V* visitor = (V*) aContext;

    acceptVisitor<T, V>( aShape, *visitor );

    return true;
}

template <class T = SHAPE*>
class SHAPE_INDEX
{
    public:
        class Iterator
        {
        private:
            typedef typename RTree<T, int, 2, float>::Iterator RTreeIterator;
            RTreeIterator iterator;

            void Init( RTree<T, int, 2, float>* aTree )
            {
                aTree->GetFirst( iterator );
            }

        public:
            Iterator( SHAPE_INDEX* aIndex )
            {
                Init( aIndex->m_tree );
            }

            T operator*()
            {
                return *iterator;
            }

            bool operator++()
            {
                return ++iterator;
            }

            bool operator++( int )
            {
                return ++iterator;
            }

            bool IsNull()
            {
                return iterator.IsNull();
            }

            bool IsNotNull()
            {
                return iterator.IsNotNull();
            }

            T Next()
            {
                T object = *iterator;
                ++iterator;

                return object;
            }
        };

        SHAPE_INDEX();

        ~SHAPE_INDEX();

        void Add( T aShape );

        void Remove( T aShape );

        void RemoveAll();

        template <class V>
        void Accept( V aVisitor )
        {
            Iterator iter = this->Begin();

            while( !iter.IsNull() )
            {
                T shape = *iter;
                acceptVisitor( shape, aVisitor );
                iter++;
            }
        }

        void Reindex();

        template <class V>
        int Query( const SHAPE *aShape, int aMinDistance, V& aVisitor, bool aExact )
        {
            BOX2I box = aShape->BBox();
            box.Inflate( aMinDistance );

            int min[2] = { box.GetX(),         box.GetY() };
            int max[2] = { box.GetRight(),     box.GetBottom() };

            return this->m_tree->Search( min, max, aVisitor );
        }

        Iterator Begin();

    private:
        RTree<T, int, 2, float>* m_tree;
};

/*
 * Class members implementation
 */

template <class T>
SHAPE_INDEX<T>::SHAPE_INDEX()
{
    this->m_tree = new RTree<T, int, 2, float>();
}

template <class T>
SHAPE_INDEX<T>::~SHAPE_INDEX()
{
    delete this->m_tree;
}

template <class T>
void SHAPE_INDEX<T>::Add( T aShape )
{
    BOX2I box = boundingBox( aShape );
    int min[2] = { box.GetX(), box.GetY() };
    int max[2] = { box.GetRight(), box.GetBottom() };

    this->m_tree->Insert( min, max, aShape );
}

template <class T>
void SHAPE_INDEX<T>::Remove( T aShape )
{
    BOX2I box = boundingBox( aShape );
    int min[2] = { box.GetX(), box.GetY() };
    int max[2] = { box.GetRight(), box.GetBottom() };

    this->m_tree->Remove( min, max, aShape );
}

template <class T>
void SHAPE_INDEX<T>::RemoveAll()
{
    this->m_tree->RemoveAll();
}

template <class T>
void SHAPE_INDEX<T>::Reindex()
{
    RTree<T, int, 2, float>* newTree;
    newTree = new RTree<T, int, 2, float>();

    Iterator iter = this->Begin();

    while( !iter.IsNull() )
    {
        T shape = *iter;
        BOX2I box = boundingBox( shape );
        int min[2] = { box.GetX(), box.GetY() };
        int max[2] = { box.GetRight(), box.GetBottom() };
        newTree->Insert( min, max, shape );
        iter++;
    }

    delete this->m_tree;
    this->m_tree = newTree;
}

template <class T>
typename SHAPE_INDEX<T>::Iterator SHAPE_INDEX<T>::Begin()
{
    return Iterator( this );
}

#endif