GUI blocked

[Astrologer]

Hi there. I have a problem I would like you to help me with. Here is my code.

#include "qplotter.h"
 
QPlotter::QPlotter(QMainWindow *parent) :
    QMainWindow(parent)
{
    create_actions();
    create_file_test("d:\\my_projects\\1.txt");
    read_file("d:\\my_projects\\1.txt");
    create_menus();
    plot_item();
 
    //connect(loadFileAction, SIGNAL(triggered()), this, SLOT(repaint()));
}
 
void QPlotter::repaint()
{
    funPlot->resize(this->size());
}
 
void QPlotter::plot_item()
{
     QwtPlotCurve* temp_curve = new QwtPlotCurve();
     QPen pen = QPen(Qt::blue);
     temp_curve->setRenderHint(QwtPlotItem::RenderAntialiased);
     temp_curve->setPen(pen);
     temp_curve->setData(y_points, x_points);
     temp_curve->setVisible(true);
     temp_curve->setTitle("Channel 1, blue");
 
     funPlot = new QwtPlot(this);
     funPlot->setTitle("Channel 1");
     temp_curve->attach(funPlot);
 
     funPlot->resize(800, 600);
 
     QwtLegend* legend = new QwtLegend(this);
     funPlot->insertLegend(legend, QwtPlot::RightLegend, -1.0);
 
     this->resize(funPlot->size());
 
     this->repaint();
}
 
void QPlotter::create_actions()
{
    loadFileAction = new QAction(tr("Load file..."),this);
    saveCurveAsImageAction = new QAction(tr("Save as image..."), this);
}
 
void QPlotter::create_menus()
{
    fileMenu = new QMenu();
    this->menuBar()->addMenu(fileMenu);
 
    fileMenu->setTitle("File");
    fileMenu->addAction(loadFileAction);
    fileMenu->addAction(saveCurveAsImageAction);
}
 
void QPlotter::create_file_test(char* name)
{
    FILE* in_file;
    in_file = fopen(name, "w");
 
    //create and fill vectors with test values
    std::vector<float> a, b;
 
    for (int i = 0; i < 10000; i+=50) a.push_back(i);
    for (int i = 0; i < 200; i++) b.push_back(i);
 
    for (int i = 0; i < 200; i++) fprintf(in_file, "%f %f\n", b[i], a[i]);
    fclose(in_file);
}
 
void QPlotter::read_file(char* name)
{
    FILE* in_file;
    in_file = fopen(name, "r");
 
    rewind(in_file);
 
    float* temp1 = (float*)calloc(1, sizeof(float));
    float* temp2 = (float*)calloc(1, sizeof(float));
    while (!feof(in_file))
    {
            fscanf(in_file, "%f %f", temp1, temp2);
            x_points.push_back(*temp1);
            y_points.push_back(*temp2);
    }
 
    int k = 0;
 
    free(temp1);//free allocated memory
    free(temp2);//free allocated memory
}

#include "qplotter.h"

QPlotter::QPlotter(QMainWindow *parent) :
    QMainWindow(parent)
{
    create_actions();
    create_file_test("d:\\my_projects\\1.txt");
    read_file("d:\\my_projects\\1.txt");
    create_menus();
    plot_item();

    //connect(loadFileAction, SIGNAL(triggered()), this, SLOT(repaint()));
}

void QPlotter::repaint()
{
    funPlot->resize(this->size());
}

void QPlotter::plot_item()
{
     QwtPlotCurve* temp_curve = new QwtPlotCurve();
     QPen pen = QPen(Qt::blue);
     temp_curve->setRenderHint(QwtPlotItem::RenderAntialiased);
     temp_curve->setPen(pen);
     temp_curve->setData(y_points, x_points);
     temp_curve->setVisible(true);
     temp_curve->setTitle("Channel 1, blue");

     funPlot = new QwtPlot(this);
     funPlot->setTitle("Channel 1");
     temp_curve->attach(funPlot);

     funPlot->resize(800, 600);

     QwtLegend* legend = new QwtLegend(this);
     funPlot->insertLegend(legend, QwtPlot::RightLegend, -1.0);

     this->resize(funPlot->size());

     this->repaint();
}

void QPlotter::create_actions()
{
    loadFileAction = new QAction(tr("Load file..."),this);
    saveCurveAsImageAction = new QAction(tr("Save as image..."), this);
}

void QPlotter::create_menus()
{
    fileMenu = new QMenu();
    this->menuBar()->addMenu(fileMenu);

    fileMenu->setTitle("File");
    fileMenu->addAction(loadFileAction);
    fileMenu->addAction(saveCurveAsImageAction);
}

void QPlotter::create_file_test(char* name)
{
    FILE* in_file;
    in_file = fopen(name, "w");

    //create and fill vectors with test values
    std::vector<float> a, b;

    for (int i = 0; i < 10000; i+=50) a.push_back(i);
    for (int i = 0; i < 200; i++) b.push_back(i);

    for (int i = 0; i < 200; i++) fprintf(in_file, "%f %f\n", b[i], a[i]);
    fclose(in_file);
}

void QPlotter::read_file(char* name)
{
    FILE* in_file;
    in_file = fopen(name, "r");

    rewind(in_file);

    float* temp1 = (float*)calloc(1, sizeof(float));
    float* temp2 = (float*)calloc(1, sizeof(float));
    while (!feof(in_file))
    {
            fscanf(in_file, "%f %f", temp1, temp2);
            x_points.push_back(*temp1);
            y_points.push_back(*temp2);
    }

    int k = 0;

    free(temp1);//free allocated memory
    free(temp2);//free allocated memory
}

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But after executing plot_item(), the menu is no longer clickable. If create_menus() is placed after plot_item(), everything works. What am I doing wrong? Thank you in advance.

[Astrologer]

I've changed the code this way. It works now.

void QPlotter::plot_item()
{
     QwtPlotCurve* temp_curve = new QwtPlotCurve();
     QPen pen = QPen(Qt::blue);
     temp_curve->setRenderHint(QwtPlotItem::RenderAntialiased);
     temp_curve->setPen(pen);
     temp_curve->setData(y_points, x_points);
     temp_curve->setVisible(true);
     temp_curve->setTitle("Channel 1, blue");
 
     funPlot = new QwtPlot(this);
     funPlot->setTitle("Channel 1");
     temp_curve->attach(funPlot);
 
     funPlot->resize(800, 600);
     resize(funPlot->size().width() + 10, funPlot->size().height() + 10);
 
     QwtLegend* legend = new QwtLegend(this);
     funPlot->insertLegend(legend, QwtPlot::RightLegend, -1.0);
 
     setCentralWidget(funPlot);
}

void QPlotter::plot_item()
{
     QwtPlotCurve* temp_curve = new QwtPlotCurve();
     QPen pen = QPen(Qt::blue);
     temp_curve->setRenderHint(QwtPlotItem::RenderAntialiased);
     temp_curve->setPen(pen);
     temp_curve->setData(y_points, x_points);
     temp_curve->setVisible(true);
     temp_curve->setTitle("Channel 1, blue");

     funPlot = new QwtPlot(this);
     funPlot->setTitle("Channel 1");
     temp_curve->attach(funPlot);

     funPlot->resize(800, 600);
     resize(funPlot->size().width() + 10, funPlot->size().height() + 10);

     QwtLegend* legend = new QwtLegend(this);
     funPlot->insertLegend(legend, QwtPlot::RightLegend, -1.0);

     setCentralWidget(funPlot);
}

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