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Code: Alles auswählen

    myplot = new QwtPlot(this);
    myplot->move(QPoint(400,50));
    myplot->setTitle("Messkurve");
    myplot->setCanvasBackground(Qt::white);
    myplot->setFixedSize(400,345);

    mycurve = new QwtPlotCurve();

    mycurve->setTitle("Line");
    mycurve->setPen(QPen(Qt::black));
    mycurve->setRenderHint(QwtPlotItem::RenderAntialiased, true);

    points << QPointF( 0.0, 4.4 ) << QPointF( 1.0, 3.0 )
           << QPointF( 2.0, 4.5 ) << QPointF( 3.0, 6.8 )
           << QPointF( 4.0, 7.9 ) << QPointF( 5.0, 7.1 );

    mycurve->setSamples( points );

    mycurve->attach(myplot);
    myplot->show();

Code: Alles auswählen

void MainWindow::slot_set_values(double ptm_temp, double ptm_hv, double heat_temp, double nomtemp, double current, double voltage)
{
    using namespace GLOBAL;
    ui->pmtValueLabel->setText(QString::number(ptm_temp));
    ui->hvValueLabel->setText(QString::number(ptm_hv));
    ui->heatValueLabel->setText(QString::number(heat_temp));
    ui->nomValueLabel->setText(QString::number(nomtemp));
    ui->currenValueLabel->setText(QString::number(current));
    ui->vValueLabel->setText(QString::number(voltage));

    points << QPointF(i++, ptm_hv);

    QList<QPointF> plist = points.toList();
    if (!plist.isEmpty())
    {
        for(int i = 0; i < plist.count(); i++)
        {
            qDebug() << "listed" << plist[i].x() << plist[i].y();
        }
    }

    myplot->replot(); // Absturz :-(
}

Code: Alles auswählen

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QDebug>
#include <QThread>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QwtPlot *myplot;
    QwtPlotCurve *mycurve;

private slots:
    void on_startButton_clicked();
    void on_stopButton_clicked();

public slots:
    void slot_set_values(double ptm_temp, double ptm_hv, double heat_temp, double nomtemp, double current, double voltage);

private:
    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

Code: Alles auswählen

#include "mainwindow.h"
#include "ui_mainwindow.h"

namespace GLOBAL
{
    QPolygonF points;
    int valuecounter = 0;
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    using namespace GLOBAL;
    ui->setupUi(this);

    myplot = new QwtPlot(this);
    myplot->move(QPoint(400,50));
    myplot->setTitle("Messkurve");
    myplot->setCanvasBackground(Qt::white);
    myplot->setFixedSize(400,345);

    mycurve = new QwtPlotCurve();

    mycurve->setTitle("Line");
    mycurve->setPen(QPen(Qt::black));
    mycurve->setRenderHint(QwtPlotItem::RenderAntialiased, true);

    points << QPointF( 0.0, 4.4 ) << QPointF( 1.0, 3.0 )
           << QPointF( 2.0, 4.5 ) << QPointF( 3.0, 6.8 )
           << QPointF( 4.0, 70.9 ) << QPointF( 5.0, 7001 );

    mycurve->setSamples( points );

    mycurve->attach(myplot);
    myplot->show();
    //myplot->replot();  <-- das funktioniert!
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::slot_set_values(double ptm_temp, double ptm_hv, double heat_temp, double nomtemp, double current, double voltage)
{
    using namespace GLOBAL;
    ui->pmtValueLabel->setText(QString::number(ptm_temp));
    ui->hvValueLabel->setText(QString::number(ptm_hv));
    ui->heatValueLabel->setText(QString::number(heat_temp));
    ui->nomValueLabel->setText(QString::number(nomtemp));
    ui->currenValueLabel->setText(QString::number(current));
    ui->vValueLabel->setText(QString::number(voltage));

    points << QPointF(valuecounter++, ptm_hv);

    QList<QPointF> plist = points.toList();
    if (!plist.isEmpty())
    {
        for(int i = 0; i < plist.count(); i++)
        {
            qDebug() << "points" << plist[i].x() << plist[i].y();
        }
    }

    myplot->replot(); <-- hier stürzt er ab!

    //qDebug() <<"set_values SLOT " <<ptm_temp<<" "<<ptm_hv<<" "<<heat_temp<<" "<<nomtemp<<" "<<current<<" "<<voltage;

}

Code: Alles auswählen

mycurve->setSamples( points ); //hinzu gefügt
myplot->replot();