xyseriesiodevice.cpp
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r0 | /**************************************************************************** | ||
| ** | ||||
| ** 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 | ||||
| ** 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 "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) | ||||
| { | ||||
| qint64 range = 2000; | ||||
| QVector<QPointF> oldPoints = m_series->pointsVector(); | ||||
| QVector<QPointF> points; | ||||
| int resolution = 4; | ||||
| if (oldPoints.count() < range) { | ||||
| points = m_series->pointsVector(); | ||||
| } else { | ||||
| for (int i = maxSize/resolution; i < oldPoints.count(); i++) | ||||
| points.append(QPointF(i - maxSize/resolution, oldPoints.at(i).y())); | ||||
| } | ||||
| qint64 size = points.count(); | ||||
| for (int k = 0; k < maxSize/resolution; k++) | ||||
| points.append(QPointF(k + size, ((quint8)data[resolution * k] - 128)/128.0)); | ||||
| m_series->replace(points); | ||||
| return maxSize; | ||||
| } | ||||