[Resolved] Qwt - Do not start curves on [0,0]

[Irony]

Hi,

I'm Irony, a Frensh student, so sorry for my English.

I have a problem with Qwt.
I have a QwtPlot, with two QwtPlotCurves, but the curves begin at the point [0,0]. How can I remove this ?

void IhmConsulterTest::initGraphique(bool typeTest) 
{
 
        //Initialization of the graphic title
 
        ui->myPlot->setTitle(ui->comboBox->currentText());
 
        //Background color of the graphic
 
        ui->myPlot->setCanvasBackground(Qt::white);
 
        //Axes Title
        if(!typeTest)
            ui->myPlot->setAxisTitle(QwtPlot::yLeft,QString("Température (°C)"));
        else
            ui->myPlot->setAxisTitle(QwtPlot::yLeft,QString("Puissance sonore (dB)"));
        if(!typeTest)
            ui->myPlot->setAxisTitle(QwtPlot::xBottom,QString("Temps (s)"));
        else
            ui->myPlot->setAxisTitle(QwtPlot::xBottom,QString("Fréquence (Hz)"));
 
 
        //New curves
 
        QwtPlotCurve * myCurve = new QwtPlotCurve();
        QwtPlotCurve * myCurve2 = new QwtPlotCurve();
 
        // Attachement
 
        myCurve->attach(ui->myPlot);
        myCurve2->attach(ui->myPlot);
        QVector<double> x(5);
        QVector<double> y(5);
        QVector<double> y2(5);
 
        //Color of the curves
 
        monPenCourbe1 = QPen(Qt::red);
        monPenCourbe1.setWidth(1.5);
        monPenCourbe2 = QPen(Qt::blue);
        monPenCourbe2.setWidth(1.5);
 
 
        // Values of the curves
 
        for(int i=0;i<courbe1.size();i++)
        {
            x.append(courbe1[i].x);
            y.append(courbe1[i].capteur_interieur);
            y2.append(courbe1[i].capteur_exterieur);
        }
 
        //Attachement -> data
 
        myCurve->setSamples(x.data(),y.data(),x.size());
        myCurve2->setSamples(x.data(),y2.data(),x.size());
 
        //Attachement -> Pen
 
        myCurve->setPen(monPenCourbe1);
        myCurve2->setPen(monPenCourbe2);
 
        //Replot
 
        ui->myPlot->replot();
 
 
}

void IhmConsulterTest::initGraphique(bool typeTest) 
{

        //Initialization of the graphic title

        ui->myPlot->setTitle(ui->comboBox->currentText());

        //Background color of the graphic

        ui->myPlot->setCanvasBackground(Qt::white);

        //Axes Title
        if(!typeTest)
            ui->myPlot->setAxisTitle(QwtPlot::yLeft,QString("Température (°C)"));
        else
            ui->myPlot->setAxisTitle(QwtPlot::yLeft,QString("Puissance sonore (dB)"));
        if(!typeTest)
            ui->myPlot->setAxisTitle(QwtPlot::xBottom,QString("Temps (s)"));
        else
            ui->myPlot->setAxisTitle(QwtPlot::xBottom,QString("Fréquence (Hz)"));


        //New curves

        QwtPlotCurve * myCurve = new QwtPlotCurve();
        QwtPlotCurve * myCurve2 = new QwtPlotCurve();

        // Attachement

        myCurve->attach(ui->myPlot);
        myCurve2->attach(ui->myPlot);
        QVector<double> x(5);
        QVector<double> y(5);
        QVector<double> y2(5);

        //Color of the curves

        monPenCourbe1 = QPen(Qt::red);
        monPenCourbe1.setWidth(1.5);
        monPenCourbe2 = QPen(Qt::blue);
        monPenCourbe2.setWidth(1.5);


        // Values of the curves
        
        for(int i=0;i<courbe1.size();i++)
        {
            x.append(courbe1[i].x);
            y.append(courbe1[i].capteur_interieur);
            y2.append(courbe1[i].capteur_exterieur);
        }

        //Attachement -> data

        myCurve->setSamples(x.data(),y.data(),x.size());
        myCurve2->setSamples(x.data(),y2.data(),x.size());

        //Attachement -> Pen

        myCurve->setPen(monPenCourbe1);
        myCurve2->setPen(monPenCourbe2);

        //Replot

        ui->myPlot->replot();


}

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Capture.PNG

Could someone please help me?
Thank you in advance!

[Uwe]

QVector<double> x(5);

QVector<double> x(5);

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Here you create a vector filled with 5 elements - later you append to this vector leaving the first 5 elements uninitialized.

Uwe

[Irony]

Thank you very much !

QVector<double> x(0);
        QVector<double> y(0);
        QVector<double> y2(0);

QVector<double> x(0);
        QVector<double> y(0);
        QVector<double> y2(0);

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It's work !