ScopeView.qml Example File

qmloscilloscope/qml/qmloscilloscope/ScopeView.qml
/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:GPL$
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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import QtQuick 2.0
import QtCharts 2.1

ChartView {
    id: chartView
    animationOptions: ChartView.NoAnimation
    theme: ChartView.ChartThemeDark
    property bool openGL: true
    onOpenGLChanged: {
        series("signal 1").useOpenGL = openGL;
        series("signal 2").useOpenGL = openGL;
    }

    ValueAxis {
        id: axisY1
        min: -1
        max: 4
    }

    ValueAxis {
        id: axisY2
        min: -10
        max: 5
    }

    ValueAxis {
        id: axisX
        min: 0
        max: 1024
    }

    LineSeries {
        id: lineSeries1
        name: "signal 1"
        axisX: axisX
        axisY: axisY1
        useOpenGL: chartView.openGL
    }
    LineSeries {
        id: lineSeries2
        name: "signal 2"
        axisX: axisX
        axisYRight: axisY2
        useOpenGL: chartView.openGL
    }

    Timer {
        id: refreshTimer
        interval: 1 / 60 * 1000 // 60 Hz
        running: true
        repeat: true
        onTriggered: {
            dataSource.update(chartView.series(0));
            dataSource.update(chartView.series(1));
        }
    }

    function changeSeriesType(type) {
        chartView.removeAllSeries();

        // Create two new series of the correct type. Axis x is the same for both of the series,
        // but the series have their own y-axes to make it possible to control the y-offset
        // of the "signal sources".
        if (type == "line") {
            var series1 = chartView.createSeries(ChartView.SeriesTypeLine, "signal 1",
                                                 axisX, axisY1);
            series1.useOpenGL = chartView.openGL

            var series2 = chartView.createSeries(ChartView.SeriesTypeLine, "signal 2",
                                                 axisX, axisY2);
            series2.useOpenGL = chartView.openGL
        } else {
            var series1 = chartView.createSeries(ChartView.SeriesTypeScatter, "signal 1",
                                                 axisX, axisY1);
            series1.markerSize = 2;
            series1.borderColor = "transparent";
            series1.useOpenGL = chartView.openGL

            var series2 = chartView.createSeries(ChartView.SeriesTypeScatter, "signal 2",
                                                 axisX, axisY2);
            series2.markerSize = 2;
            series2.borderColor = "transparent";
            series2.useOpenGL = chartView.openGL
        }
    }

    function createAxis(min, max) {
        // The following creates a ValueAxis object that can be then set as a x or y axis for a series
        return Qt.createQmlObject("import QtQuick 2.0; import QtCharts 2.0; ValueAxis { min: "
                                  + min + "; max: " + max + " }", chartView);
    }

    function setAnimations(enabled) {
        if (enabled)
            chartView.animationOptions = ChartView.SeriesAnimations;
        else
            chartView.animationOptions = ChartView.NoAnimation;
    }

    function changeRefreshRate(rate) {
        refreshTimer.interval = 1 / Number(rate) * 1000;
    }
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.