diff options
Diffstat (limited to 'src/gui/kernel/qdirectionrecognizer.cpp')
| -rw-r--r-- | src/gui/kernel/qdirectionrecognizer.cpp | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/gui/kernel/qdirectionrecognizer.cpp b/src/gui/kernel/qdirectionrecognizer.cpp new file mode 100644 index 0000000..2896523 --- /dev/null +++ b/src/gui/kernel/qdirectionrecognizer.cpp @@ -0,0 +1,176 @@ +/**************************************************************************** +** +** 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. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qdirectionrecognizer_p.h" + +#include <math.h> + +QT_BEGIN_NAMESPACE + +static const int SIZE = 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 >= SIZE/2) + direction = Qt::LeftDirection; + } else { + if (dx >= SIZE/2) + direction = Qt::RightDirection; + } + if (dy < 0) { + if (-1*dy >= SIZE/2) + direction = Qt::UpDirection; + } else { + if (dy >= SIZE/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 < SIZE/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 |