diff options
Diffstat (limited to 'examples/datavisualization/audiolevels/audiolevelsiodevice.cpp')
-rw-r--r-- | examples/datavisualization/audiolevels/audiolevelsiodevice.cpp | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/examples/datavisualization/audiolevels/audiolevelsiodevice.cpp b/examples/datavisualization/audiolevels/audiolevelsiodevice.cpp deleted file mode 100644 index 7cd2bbb3..00000000 --- a/examples/datavisualization/audiolevels/audiolevelsiodevice.cpp +++ /dev/null @@ -1,114 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the Qt Data Visualization module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:GPL$ -** 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 The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 3 or (at your option) any later version -** approved by the KDE Free Qt Foundation. The licenses are as published by -** the Free Software Foundation and appearing in the file LICENSE.GPL3 -** included in the packaging of this file. Please review the following -** information to ensure the GNU General Public License requirements will -** be met: https://www.gnu.org/licenses/gpl-3.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "audiolevelsiodevice.h" -#include <QtCore/QDebug> - -using namespace QtDataVisualization; - -//! [1] -static const int resolution = 8; -static const int rowSize = 800; -static const int rowCount = 7; // Must be odd number -static const int middleRow = rowCount / 2; -//! [1] - -AudioLevelsIODevice::AudioLevelsIODevice(QBarDataProxy *proxy, QObject *parent) - : QIODevice(parent), - m_proxy(proxy), - m_array(new QBarDataArray) -{ - // We reuse the existing array for maximum performance, so construct the array here - //! [0] - m_array->reserve(rowCount); - for (int i = 0; i < rowCount; i++) - m_array->append(new QBarDataRow(rowSize)); - //! [0] - - qDebug() << "Total of" << (rowSize * rowCount) << "items in the array."; -} - -// Implementation required for this pure virtual function -qint64 AudioLevelsIODevice::readData(char *data, qint64 maxSize) -{ - Q_UNUSED(data); - Q_UNUSED(maxSize); - return -1; -} - -//! [2] -qint64 AudioLevelsIODevice::writeData(const char *data, qint64 maxSize) -{ - // The amount of new data available. - int newDataSize = maxSize / resolution; - - // If we get more data than array size, we need to adjust the start index for new data. - int newDataStartIndex = qMax(0, (newDataSize - rowSize)); - - // Move the old data ahead in the rows (only do first half of rows + middle one now). - // If the amount of new data was larger than row size, skip copying. - if (!newDataStartIndex) { - for (int i = 0; i <= middleRow; i++) { - QBarDataItem *srcPos = m_array->at(i)->data(); - QBarDataItem *dstPos = srcPos + newDataSize; - memmove((void *)dstPos, (void *)srcPos, (rowSize - newDataSize) * sizeof(QBarDataItem)); - } - } - - // Insert data in reverse order, so that newest data is always at the front of the row. - int index = 0; - for (int i = newDataSize - 1; i >= newDataStartIndex; i--) { - // Add 0.01 to the value to avoid gaps in the graph (i.e. zero height bars). - // Also, scale to 0...100 - float value = float(quint8(data[resolution * i]) - 128) / 1.28f + 0.01f; - (*m_array->at(middleRow))[index].setValue(value); - // Insert a fractional value into front half of the rows. - for (int j = 1; j <= middleRow; j++) { - float fractionalValue = value / float(j + 1); - (*m_array->at(middleRow - j))[index].setValue(fractionalValue); - } - index++; - } - - // Copy the front half of rows to the back half for symmetry. - index = 0; - for (int i = rowCount - 1; i > middleRow; i--) { - QBarDataItem *srcPos = m_array->at(index++)->data(); - QBarDataItem *dstPos = m_array->at(i)->data(); - memcpy((void *)dstPos, (void *)srcPos, rowSize * sizeof(QBarDataItem)); - } - - // Reset the proxy array now that data has been updated to trigger a redraw. - m_proxy->resetArray(m_array); - - return maxSize; -} -//! [2] - - |