1 files changed, 91 insertions, 0 deletions
diff --git a/examples/charts/qmloscilloscope/datasource.cpp b/examples/charts/qmloscilloscope/datasource.cpp
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+++ b/examples/charts/qmloscilloscope/datasource.cpp
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+/****************************************************************************
+**
+** 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);
+    }
+}