/**************************************************************************** ** ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the QtDeclarative module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** You may use this file under the terms of the BSD license as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names ** of its contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include "accelerometerfilter.h" #define RADIANS_TO_DEGREES 57.2957795 AccelerometerFilter::AccelerometerFilter() : x(0), y(0), z(0) { } //! [0] bool AccelerometerFilter::filter(QAccelerometerReading *reading) { qreal rx = reading->x(); qreal ry = reading->y(); qreal rz = reading->z(); qreal divider = sqrt(rx * rx + ry * ry + rz * rz); // Lowpass factor #ifdef Q_OS_SYMBIAN float lowPassFactor = 0.10; #else float lowPassFactor = 0.05; #endif // Calculate the axis angles in degrees and reduce the noise in sensor // readings. x += (acos(rx / divider) * RADIANS_TO_DEGREES - 90 - x) * lowPassFactor; y += (acos(ry / divider) * RADIANS_TO_DEGREES - 90 - y) * lowPassFactor; z += (acos(rz / divider) * RADIANS_TO_DEGREES - 90 - z) * lowPassFactor; // The orientations of the accelerometers are different between // Symbian and Maemo devices so we use the different axes // depending on the platform. #if defined(Q_OS_SYMBIAN) emit rotationChanged(-y); #else emit rotationChanged(x); #endif // Don't store the reading in the sensor. return false; } //! [0]