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Diffstat (limited to 'examples/charts/qmloscilloscope/datasource.cpp')
-rw-r--r-- | examples/charts/qmloscilloscope/datasource.cpp | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/examples/charts/qmloscilloscope/datasource.cpp b/examples/charts/qmloscilloscope/datasource.cpp new file mode 100644 index 00000000..ff651110 --- /dev/null +++ b/examples/charts/qmloscilloscope/datasource.cpp @@ -0,0 +1,91 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.digia.com +** +** This file is part of the Qt Enterprise Charts Add-on. +** +** $QT_BEGIN_LICENSE$ +** Licensees holding valid Qt Enterprise licenses may use this file in +** accordance with the Qt Enterprise License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. +** +** If you have questions regarding the use of this file, please use +** contact form at http://qt.digia.com +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "datasource.h" +#include <QXYSeries> +#include <QAreaSeries> +#include <QtQuick/QQuickView> +#include <QtQuick/QQuickItem> +#include <QDebug> +#include <qmath.h> + +QT_CHARTS_USE_NAMESPACE + +Q_DECLARE_METATYPE(QAbstractSeries *) +Q_DECLARE_METATYPE(QAbstractAxis *) + +DataSource::DataSource(QQuickView *appViewer, QObject *parent) : + QObject(parent), + m_appViewer(appViewer), + m_index(-1) +{ + qRegisterMetaType<QAbstractSeries*>(); + qRegisterMetaType<QAbstractAxis*>(); + + generateData(0, 5, 1024); +} + +void DataSource::update(QAbstractSeries *series) +{ + if (series) { + QXYSeries *xySeries = static_cast<QXYSeries *>(series); + m_index++; + if (m_index > m_data.count() - 1) + m_index = 0; + + QList<QPointF> points = m_data.at(m_index); + // Use replace instead of clear + append, it's optimized for performance + xySeries->replace(points); + } +} + +void DataSource::generateData(int type, int rowCount, int colCount) +{ + // Remove previous data + foreach (QList<QPointF> row, m_data) + row.clear(); + m_data.clear(); + + // Append the new data depending on the type + for (int i(0); i < rowCount; i++) { + QList<QPointF> points; + for (int j(0); j < colCount; j++) { + qreal x(0); + qreal y(0); + switch (type) { + case 0: + // data with sin + random component + y = qSin(3.14159265358979 / 50 * j) + 0.5 + (qreal) rand() / (qreal) RAND_MAX; + x = j; + break; + case 1: + // linear data + x = j; + y = (qreal) i / 10; + break; + default: + // unknown, do nothing + break; + } + points.append(QPointF(x, y)); + } + m_data.append(points); + } +} |