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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui 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 http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qdirectionrecognizer_p.h"
#include <math.h>
QT_BEGIN_NAMESPACE
enum {
DistanceDelta = 20
};
QDirectionSimpleRecognizer::QDirectionSimpleRecognizer()
{
}
Direction QDirectionSimpleRecognizer::addPosition(const QPoint &pos)
{
if (!directions.isEmpty()) {
const QPoint tmp = pos - directions.back().point;
if (tmp.manhattanLength() < 5)
return Direction();
}
if (lastPoint.isNull()) {
lastPoint = pos;
return Direction();
}
int dx = pos.x() - lastPoint.x();
int dy = pos.y() - lastPoint.y();
Qt::DirectionType direction = Qt::NoDirection;
if (dx < 0) {
if (-1*dx >= DistanceDelta/2)
direction = Qt::LeftDirection;
} else {
if (dx >= DistanceDelta/2)
direction = Qt::RightDirection;
}
if (dy < 0) {
if (-1*dy >= DistanceDelta/2)
direction = Qt::UpDirection;
} else {
if (dy >= DistanceDelta/2)
direction = Qt::DownDirection;
}
if (direction == Qt::NoDirection)
return Direction();
lastPoint = pos;
directions.push_back(Direction(direction, pos));
return Direction(direction, pos);
}
DirectionList QDirectionSimpleRecognizer::getDirections() const
{
return directions;
}
void QDirectionSimpleRecognizer::reset()
{
directions.clear();
lastPoint = QPoint();
}
/// QDirectionDiagonalRecognizer
QDirectionDiagonalRecognizer::QDirectionDiagonalRecognizer()
{
}
Direction QDirectionDiagonalRecognizer::addPosition(const QPoint &pos)
{
if (!directions.isEmpty()) {
const QPoint tmp = pos - directions.back().point;
if (tmp.manhattanLength() < 5)
return Direction();
}
if (lastPoint.isNull()) {
lastPoint = pos;
return Direction();
}
int dx = pos.x() - lastPoint.x();
int dy = pos.y() - lastPoint.y();
int distance = sqrt(static_cast<double>(dx*dx + dy*dy));
if (distance < DistanceDelta/2)
return Direction();
Qt::DirectionType direction = Qt::NoDirection;
double angle = atan(1.0*qAbs(lastPoint.y() - pos.y())/qAbs(pos.x() - lastPoint.x())) * 180. / M_PI;
if (dx < 0 && dy <= 0) {
angle = 180 - angle;
} else if (dx <= 0 && dy > 0) {
angle += 180;
} else if (dx > 0 && dy > 0) {
angle = 360-angle;
}
if (angle < 0)
angle += 360;
if (angle <= 20)
direction = Qt::RightDirection;
else if (angle <= 65)
direction = Qt::RightUpDirection;
else if (angle <= 110)
direction = Qt::UpDirection;
else if (angle <= 155)
direction = Qt::LeftUpDirection;
else if (angle <= 200)
direction = Qt::LeftDirection;
else if (angle <= 245)
direction = Qt::LeftDownDirection;
else if (angle <= 290)
direction = Qt::DownDirection;
else if (angle <= 335)
direction = Qt::RightDownDirection;
else
direction = Qt::RightDirection;
if (direction == Qt::NoDirection)
return Direction();
lastPoint = pos;
directions.push_back(Direction(direction, pos));
return Direction(direction, pos);
}
DirectionList QDirectionDiagonalRecognizer::getDirections() const
{
return directions;
}
void QDirectionDiagonalRecognizer::reset()
{
directions.clear();
lastPoint = QPoint();
}
QT_END_NAMESPACE
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