QChartView does not draw multiple curves

JoeCFD

class FCurveView : public QChartView
{
    Q_OBJECT

public:
    explicit FCurveView( QWidget * parent = nullptr, const QString & legend_name = QString( "" ) );
    virtual ~FCurveView();
    
    void addData( const float x, const float y, const unsigned idx = 0 );    
    void addLineSeries( const QColor & color, const QString & legend_name = QString( "" ) );
    void addLogYData( const float x, const float y, const unsigned idx = 0 );
    void clear();
    void setCurveTitle( const QString title );
    void setTitleText( const QString title_x, const QString title_y );
    void setXRanges( const float min_x, const float max_x );
    void setYRanges( const float min_y, const float max_y );
    
private:
    std::vector< QLineSeries * > m_vecLineSeries;
};

FCurveView::FCurveView( QWidget * parent,  const QString & legend_name )
    : QChartView( new QChart(), parent )
{
    setRenderHint( QPainter::Antialiasing );
    
    addLineSeries( Qt::red, legend_name );

    chart()->createDefaultAxes();
    chart()->axisX()->setTitleText( QString( "X" ) );
    chart()->axisY()->setTitleText( QString( "Y" )  );

    chart()->legend()->attachToChart();
    chart()->legend()->setVisible( true );
    chart()->legend()->setAlignment( Qt::AlignRight );
}

void FCurveView::addData( const float x, const float y, const unsigned idx )
{
    m_vecLineSeries[ idx ]->append( x, y );
}
    
void FCurveView::addLineSeries( const QColor & color, const QString & legend_name )
{ 
    QLineSeries * line_series = new QLineSeries();
    line_series->setName( legend_name );
    line_series->setPen( QPen( color, 1, Qt::SolidLine ) );
    chart()->addSeries( line_series );
    m_vecLineSeries.push_back( line_series );
}

5 sets of data are dynamically generated and fed into the curveview class. Only the first curve is drawn. I can see all 5 legends and the first curve. Why do not the other four curves show up? These sets of data are in the similar range. Any comments?

JoeCFD

No comments?

VRonin

Can you show us how you call FCurveView::addData?

MrShawn

I feel like I ran into a similar issue awhile back but it has been awhile.

Try adding an axis to your series that comes from the chart so they all have the same axis. One for x-dir and y-dir.

JoeCFD

@MrShawn You made my day, Shawn. Many thanks.