1 files changed, 163 insertions, 0 deletions
diff --git a/plugins/sensorgestures/shake/qshakerecognizer.cpp b/plugins/sensorgestures/shake/qshakerecognizer.cpp
new file mode 100644
index 0000000000..fde0812a94
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+++ b/plugins/sensorgestures/shake/qshakerecognizer.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QDebug>
+#include <QTimer>
+
+#include "qshakerecognizer.h"
+
+QShakeSensorGestureRecognizer::QShakeSensorGestureRecognizer(QObject *parent)
+    : QSensorGestureRecognizer(parent)
+    , timerTimeout(450)
+    , active(0)
+    , shaking(0)
+    , shakeCount(0)
+{
+}
+
+QShakeSensorGestureRecognizer::~QShakeSensorGestureRecognizer()
+{
+}
+
+void QShakeSensorGestureRecognizer::create()
+{
+    accel = new QAccelerometer(this);
+    accel->connectToBackend();
+    accel->setDataRate(50);
+
+    qoutputrangelist outputranges = accel->outputRanges();
+
+    if (outputranges.count() > 0)
+        accelRange = (int)(outputranges.at(0).maximum *2) / 9.8; //approx range in g's
+    else
+        accelRange = 4; //this should never happen
+
+    connect(accel,SIGNAL(readingChanged()),this,SLOT(accelChanged()));
+    timer = new QTimer(this);
+    connect(timer,SIGNAL(timeout()),this,SLOT(timeout()));
+    timer->setSingleShot(true);
+    timer->setInterval(timerTimeout);
+}
+
+bool QShakeSensorGestureRecognizer::start()
+{
+    active = accel->start();
+    return active;
+}
+
+bool QShakeSensorGestureRecognizer::stop()
+{
+    accel->stop();
+    active = accel->isActive();
+    return !active;
+}
+
+bool QShakeSensorGestureRecognizer::isActive()
+{
+    return active;
+}
+
+QString QShakeSensorGestureRecognizer::id() const
+{
+    return QString("QtSensors.shake");
+}
+
+#define NUMBER_SHAKES 3
+#define THRESHOLD 25
+
+void QShakeSensorGestureRecognizer::accelChanged()
+{
+    qreal x = accel->reading()->x();
+    qreal y = accel->reading()->y();
+    qreal z = accel->reading()->z();
+
+    currentData.x = x;
+    currentData.y = y;
+    currentData.z = z;
+
+    if (qAbs(prevData.x - currentData.x)  < 1
+            && qAbs(prevData.y - currentData.y)  < 1
+            && qAbs(prevData.z - currentData.z)  < 1) {
+        prevData.x = currentData.x;
+        prevData.y = currentData.y;
+        prevData.z = currentData.z;
+        return;
+    }
+
+    bool wasShake = checkForShake(prevData, currentData, THRESHOLD);
+    if (!shaking && wasShake &&
+        shakeCount >= NUMBER_SHAKES) {
+        shaking = true;
+        shakeCount = 0;
+        Q_EMIT shake();
+        Q_EMIT detected("shake");
+
+    } else if (wasShake) {
+
+        shakeCount++;
+        if (shakeCount > NUMBER_SHAKES) {
+            timer->start();
+        }
+    }
+
+    prevData.x = currentData.x;
+    prevData.y = currentData.y;
+    prevData.z = currentData.z;
+}
+
+void QShakeSensorGestureRecognizer::timeout()
+{
+    shakeCount = 0;
+    shaking = false;
+}
+
+bool QShakeSensorGestureRecognizer::checkForShake(AccelData prevSensorData, AccelData currentSensorData, qreal threshold)
+{
+    double deltaX = qAbs(prevSensorData.x - currentSensorData.x);
+    double deltaY = qAbs(prevSensorData.y - currentSensorData.y);
+    double deltaZ = qAbs(prevSensorData.z - currentSensorData.z);
+
+    return (deltaX > threshold
+            || deltaY > threshold
+            || deltaZ > threshold);
+       (deltaY > threshold && deltaZ > threshold);
+}
+