| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the Qt Charts module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:GPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
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| ** 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 |
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| ****************************************************************************/ |
| |
| #include "xyseriesiodevice.h" |
| |
| #include <QtCharts/QXYSeries> |
| |
| XYSeriesIODevice::XYSeriesIODevice(QXYSeries *series, QObject *parent) : |
| QIODevice(parent), |
| m_series(series) |
| { |
| } |
| |
| qint64 XYSeriesIODevice::readData(char *data, qint64 maxSize) |
| { |
| Q_UNUSED(data) |
| Q_UNUSED(maxSize) |
| return -1; |
| } |
| |
| qint64 XYSeriesIODevice::writeData(const char *data, qint64 maxSize) |
| { |
| static const int resolution = 4; |
| |
| if (m_buffer.isEmpty()) { |
| m_buffer.reserve(sampleCount); |
| for (int i = 0; i < sampleCount; ++i) |
| m_buffer.append(QPointF(i, 0)); |
| } |
| |
| int start = 0; |
| const int availableSamples = int(maxSize) / resolution; |
| if (availableSamples < sampleCount) { |
| start = sampleCount - availableSamples; |
| for (int s = 0; s < start; ++s) |
| m_buffer[s].setY(m_buffer.at(s + availableSamples).y()); |
| } |
| |
| for (int s = start; s < sampleCount; ++s, data += resolution) |
| m_buffer[s].setY(qreal(uchar(*data) -128) / qreal(128)); |
| |
| m_series->replace(m_buffer); |
| return (sampleCount - start) * resolution; |
| } |