Create chart in QT C++ and display it in QML

Chobin

Hello,

I'd like to create a chart in QT C++, and displaying it in QML.

I created a class like this one:

chart::chart(QObject *parent) : QObject(parent)
{
//![1]
QLineSeries *series0 = new QLineSeries();
QLineSeries *series1 = new QLineSeries();
//![1]

//![2]
*series0 << QPointF(1, 5) << QPointF(3, 7) << QPointF(7, 6) << QPointF(9, 7) << QPointF(12, 6)
         << QPointF(16, 7) << QPointF(18, 5);
*series1 << QPointF(1, 3) << QPointF(3, 4) << QPointF(7, 3) << QPointF(8, 2) << QPointF(12, 3)
         << QPointF(16, 4) << QPointF(18, 3);
//![2]

//![3]
QAreaSeries *series = new QAreaSeries(series0, series1);
series->setName("Batman");
QPen pen(0x059605);
pen.setWidth(3);
series->setPen(pen);

QLinearGradient gradient(QPointF(0, 0), QPointF(0, 1));
gradient.setColorAt(0.0, 0x3cc63c);
gradient.setColorAt(1.0, 0x26f626);
gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
series->setBrush(gradient);
//![3]

//![4]
QChart *chart = new QChart();
chart->addSeries(series);
chart->setTitle("Simple areachart example");
chart->createDefaultAxes();
chart->axisX()->setRange(0, 20);
chart->axisY()->setRange(0, 10);
chart->setMinimumHeight(480);
chart->setMinimumWidth(640);

}

Then in main file I registered the C++ chart class:

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QQmlApplicationEngine engine;

qmlRegisterType<chart>("myClass.com",1,0,"Chart");

engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

return app.exec();

}

In QML file I wrote:

import QtQuick 2.5
import QtQuick.Controls 1.4
import QtQuick.Dialogs 1.2
import myClass.com 1.0

ApplicationWindow {
visible: true
width: 640
height: 480

Chart {
    id: chart

}

}

When I launch the program appear a white window.

Does someone help me to solve this problem?

Many thanks.

Best Regrads,

Chobin