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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the $MODULE$ of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QDIRECTIONSIMPLIFICATOR_P_H
#define QDIRECTIONSIMPLIFICATOR_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "private/qdirectionrecognizer_p.h"
QT_BEGIN_NAMESPACE
class QDirectionSimplificator
{
public:
QDirectionSimplificator(const DirectionList &dir);
bool simplify(DirectionList *result);
private:
DirectionList directions;
DirectionList lastResult;
enum State {
None,
Trim, // remove first and last element
AccidentalMoves, // 66866 => 6666
ComplexAccidentalMoves, // 778788 => 777888 (swapping elements without changing direction)
ShortMoves, // (moves of length 1)
} state;
struct SimplifyTrim
{
SimplifyTrim() : state(0) { }
bool operator()(DirectionList &directions)
{
if (state == 0) {
directions.removeFirst();
state = 1;
} else if (state == 1) {
directions.removeLast();
state = 2;
} else if (state == 2 && directions.size() >= 2) {
directions.removeFirst();
directions.removeLast();
state = 3;
} else {
return false;
}
return true;
}
int state;
};
struct SimplifyAccidentalMoves
{
SimplifyAccidentalMoves() : state(0) { }
bool operator()(DirectionList &directions)
{
return false;
}
int state;
};
struct SimplifyComplexAccidentalMoves
{
SimplifyComplexAccidentalMoves() : state(0) { }
bool operator()(DirectionList &directions)
{
return false;
}
int state;
};
SimplifyTrim trim;
SimplifyAccidentalMoves accidentalMoves;
SimplifyComplexAccidentalMoves complexAccidentalMoves;
//SimplifyShortMoves shortMoves;
};
QDirectionSimplificator::QDirectionSimplificator(const DirectionList &dir)
: directions(dir), state(None)
{
}
bool QDirectionSimplificator::simplify(DirectionList *result)
{
if (directions.isEmpty() || !result)
return false;
*result = directions;
switch(state) {
case None:
state = Trim;
trim = SimplifyTrim();
case Trim:
if (trim(*result))
break;
*result = lastResult;
state = AccidentalMoves;
accidentalMoves = SimplifyAccidentalMoves();
case AccidentalMoves:
if (accidentalMoves(*result))
break;
*result = lastResult;
state = ComplexAccidentalMoves;
complexAccidentalMoves = SimplifyComplexAccidentalMoves();
case ComplexAccidentalMoves:
if (complexAccidentalMoves(*result))
break;
*result = lastResult;
// state = ShortMoves;
// shortMoves = SimplifyShortMoves();
// case ShortMoves:
// if (shortMoves(*result))
// break;
// state = None;
default:
return false;
}
lastResult = *result;
if (lastResult.isEmpty())
return false;
return true;
}
QT_END_NAMESPACE
#endif // QDIRECTIONSIMPLIFICATOR_P_H
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