mainwidget.h Example File

legendmarkers/mainwidget.h
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 #ifndef MAINWIDGET_H
 #define MAINWIDGET_H

 #include <QtCharts/QChartGlobal>
 #include <QtCharts/QChart>
 #include <QtCharts/QChartView>
 #include <QtWidgets/QWidget>
 #include <QtWidgets/QGraphicsWidget>
 #include <QtWidgets/QGridLayout>
 #include <QtWidgets/QGraphicsGridLayout>
 #include <QtWidgets/QDoubleSpinBox>
 #include <QtWidgets/QGroupBox>
 #include <QtCharts/QLineSeries>

 QT_CHARTS_USE_NAMESPACE

 class MainWidget : public QWidget
 {
     Q_OBJECT
 public:
     explicit MainWidget(QWidget *parent = 0);

 public slots:
     void addSeries();
     void removeSeries();
     void connectMarkers();
     void disconnectMarkers();

     void handleMarkerClicked();

 private:

     QChart *m_chart;
     QList<QLineSeries *> m_series;

     QChartView *m_chartView;
     QGridLayout *m_mainLayout;
     QGridLayout *m_fontLayout;

 };

 #endif // MAINWIDGET_H