使用QMathGL连接信号和插槽

Question

我有一个使用MathGL绘制一些简单数据并使用QMainWindow显示它的程序：

main.cpp

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

   return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
   Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
     ~MainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "plot.h"
#include <armadillo>

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

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

void MainWindow::on_pushButton_clicked()
{
    arma::mat Data;

    //String to open window to get fileName
    QString DataFile = QFileDialog::getOpenFileName(this, tr("Open File"), "/home/", tr("Text Files   (*.txt)"));


    plot test(DataFile);
}

plot.h

#ifndef PLOT_H
#define PLOT_H

#include <QObject>
#include <armadillo>
#include <mgl2/data.h>
#include <mgl2/mgl.h>
#include <mgl2/qmathgl.h>
#include <mgl2/qt.h>
#include <mgl2/wnd.h>
#include <mgl2/canvas_wnd.h>
#include <QMainWindow>
#include <QtCore>

class plot : public QObject
{
    Q_OBJECT
public:
    explicit plot(QObject *parent = 0);
    plot(QString);

signals:

public slots:

};

#endif // PLOT_H

plot.cpp

#include "plot.h"

#define MGL_MAX_LINES   (INT_MAX-1000)
#if !defined(WIN32) && !defined(__APPLE__)
#include <X11/Xlib.h>
#endif

#define TR  QObject::tr
QMenu *mglMakeMenu(QMainWindow *Wnd, QMathGL *QMGL, QSpinBox *&tet, QSpinBox *&phi)
{
QAction *a;
QMenu *o, *oo;
QToolBar *bb;

QMenu *popup = new QMenu(Wnd);
// file menu
{
    o = Wnd->menuBar()->addMenu(TR("&File"));
    oo = new QMenu(TR("&Export as 2D ..."),Wnd);
    oo->addAction(TR("PNG"), QMGL, SLOT(exportPNG()),Qt::ALT+Qt::Key_P);
    oo->addAction(TR("JPEG"), QMGL, SLOT(exportJPG()),Qt::ALT+Qt::Key_J);
    o->addMenu(oo);     popup->addMenu(oo);

    o->addSeparator();
    a = new QAction(QPixmap(), TR("Print &graphics"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(print()));
    a->setToolTip(TR("Open printer dialog and print graphics\t(CTRl+P)"));
    a->setShortcut(Qt::CTRL+Qt::Key_P); o->addAction(a);
    o->addSeparator();
    o->addAction(TR("&Close"), Wnd, SLOT(close()), Qt::CTRL+Qt::Key_W);
}
// graphics menu
{
    bb = new QToolBar(TR("Graphics"),Wnd);
    Wnd->addToolBar(Qt::TopToolBarArea, bb);
    o = Wnd->menuBar()->addMenu(TR("&Graphics"));
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/rotate.xpm"), TR("&Rotate by  mouse"), Wnd);
    a->setCheckable(true);
    Wnd->connect(a, SIGNAL(toggled(bool)), QMGL, SLOT(setRotate(bool)));
    Wnd->connect(QMGL, SIGNAL(rotateChanged(bool)), a, SLOT(setOn(bool)));
    a->setToolTip(TR("Switch on/off mouse handling of the graphics\n(rotation, shifting, zooming and perspective)."));
    bb->addAction(a);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/zoom_in.xpm"), TR("&Zoom by mouse"), Wnd);
    a->setCheckable(true);
    Wnd->connect(a, SIGNAL(toggled(bool)), QMGL, SLOT(setZoom(bool)));
    Wnd->connect(QMGL, SIGNAL(zoomChanged(bool)), a, SLOT(setOn(bool)));
    a->setToolTip(TR("Switch on/off mouse zoom of selected region."));
    bb->addAction(a);
    o->addSeparator();
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/zoom_out.xpm"), TR("Res&tore"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(restore()));
    a->setToolTip(TR("Restore default graphics rotation, zoom and perspective (Alt+Space)."));
    a->setShortcut(Qt::ALT+Qt::Key_Space);
    o->addAction(a);    bb->addAction(a);   popup->addAction(a);
    bb->addSeparator();
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/ok.xpm"), TR("Re&draw"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(update()));
    a->setToolTip(TR("Execute script and redraw graphics (F5)."));
    a->setShortcut(Qt::Key_F5);
    o->addAction(a);    bb->addAction(a);   popup->addAction(a);
    a = new QAction(TR("&Adjust size"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(adjust()));
    a->setToolTip(TR("Change canvas size to fill whole region (F6)."));
    a->setShortcut(Qt::Key_F6);     o->addAction(a);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/copy.xpm"), TR("&Copy plot"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(copy()));
    a->setToolTip(TR("Copy graphics to clipboard (CTRl+Shift+G)."));
    a->setShortcut(Qt::CTRL+Qt::SHIFT+Qt::Key_G);
    o->addAction(a);        bb->addAction(a);   popup->addAction(a);

    bb->addSeparator();
    oo = new QMenu(TR("Primitives ..."),Wnd);

    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/line.xpm"), TR("Add line"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(addLine()));
    Wnd->connect(QMGL, SIGNAL(usePrimChanged(bool)), a, SLOT(setVisible(bool)));
    a->setToolTip(TR("Add line which properties can be changed later by mouse."));
    bb->addAction(a);   oo->addAction(a);

    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/mark_a.xpm"), TR("Add mark"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(addMark()));
    Wnd->connect(QMGL, SIGNAL(usePrimChanged(bool)), a, SLOT(setVisible(bool)));
    a->setToolTip(TR("Add marker which properties can be changed later by mouse."));
    bb->addAction(a);   oo->addAction(a);

    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/text.xpm"), TR("Add text"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(addText()));
    Wnd->connect(QMGL, SIGNAL(usePrimChanged(bool)), a, SLOT(setVisible(bool)));
    a->setToolTip(TR("Add text which properties can be changed later by mouse."));
    bb->addAction(a);   oo->addAction(a);
    o->addMenu(oo);

    bb->addSeparator();
    tet = new QSpinBox(Wnd);    tet->setWrapping(true);
    bb->addWidget(tet); tet->setRange(-180, 180);   tet->setSingleStep(10);
    Wnd->connect(tet, SIGNAL(valueChanged(int)), QMGL, SLOT(setTet(int)));
    Wnd->connect(QMGL, SIGNAL(tetChanged(int)), tet, SLOT(setValue(int)));
    tet->setToolTip(TR("Set value of \\theta angle."));
    bb->addSeparator();
    phi = new QSpinBox(Wnd);    phi->setWrapping(true);
    bb->addWidget(phi); phi->setRange(-180, 180);   phi->setSingleStep(10);
    Wnd->connect(phi, SIGNAL(valueChanged(int)), QMGL, SLOT(setPhi(int)));
    Wnd->connect(QMGL, SIGNAL(phiChanged(int)), phi, SLOT(setValue(int)));
    phi->setToolTip(TR("Set value of \\phi angle."));
//  bb->addSeparator();
}
// zooming menu
{
    oo = o->addMenu(TR("Zoom/move"));
    bb = new QToolBar(TR("Zoom graphics"),Wnd);
    Wnd->addToolBar(Qt::LeftToolBarArea, bb);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/left_1.xpm"), TR("Move &left"),  Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(shiftLeft()));
    a->setToolTip(TR("Move graphics left by 1/3 of its width."));
    bb->addAction(a);       oo->addAction(a);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/up_1.xpm"), TR("Move &up"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(shiftUp()));
    a->setToolTip(TR("Move graphics up by 1/3 of its height."));
    bb->addAction(a);       oo->addAction(a);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/zoom_1.xpm"), TR("Zoom &in"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(zoomIn()));
    a->setToolTip(TR("Zoom in graphics."));
    bb->addAction(a);       oo->addAction(a);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/norm_1.xpm"), TR("Zoom &out"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(zoomOut()));
    a->setToolTip(TR("Zoom out graphics."));
    bb->addAction(a);       oo->addAction(a);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/down_1.xpm"), TR("Move &down"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(shiftDown()));
    a->setToolTip(TR("Move graphics up down 1/3 of its height."));
    bb->addAction(a);       oo->addAction(a);
    a = new QAction(QPixmap(":/usr/include/mathgl-2.1.2/include/xpm/right_1.xpm"), TR("Move &right"), Wnd);
    Wnd->connect(a, SIGNAL(triggered()), QMGL, SLOT(shiftRight()));
    a->setToolTip(TR("Move graphics right by 1/3 of its width."));
    bb->addAction(a);       oo->addAction(a);
}
// animation menu
{

}

Wnd->menuBar()->addSeparator();

return popup;
}


plot::plot(QObject *parent) :
    QObject(parent)
{
}

plot::plot(QString FileToOpen)
{

//int For Number of Points in Parsed File
int NumberofPoints = 0;

//Set Name for emit signal
//FileName = FileNameOpen;

//Count Number of Points in File
{
    //Open the Selected File
    QFile FileOpen(FileToOpen);
    QTextStream InFile( &FileOpen);
    QString Line;

    //If File Not Open Then Stop
    if (!FileOpen.open(QIODevice::ReadOnly | QIODevice::Text))
        return;

    //Count Number of Points in File
    while (!InFile.atEnd())
        {
            Line  = InFile.readLine();
            NumberofPoints = NumberofPoints + 1;
         }
    FileOpen.flush();
    FileOpen.close();
}

//Set Data Size
arma::mat residuals;
residuals.set_size(NumberofPoints,3);

//Get Data
{
QFile FileOpen2(FileToOpen);
QTextStream InFile2( &FileOpen2);
QString Line2;

//If File Not Open Then Stop
if (!FileOpen2.open(QIODevice::ReadOnly | QIODevice::Text))
    return;

//Indices for Keeping Track
int index = 0;

//Get Data in Matrix
QStringList LineSplit;
QRegExp format("(\\ )");

while (!InFile2.atEnd())
    {
        Line2  = InFile2.readLine();
        index = index + 1;
        LineSplit = Line2.split(format,QString::SkipEmptyParts);
        residuals(index -1,0) = LineSplit.at(0).toDouble();
        residuals(index -1,1) = LineSplit.at(1).toDouble();
        residuals(index -1,2) = LineSplit.at(2).toDouble();
    }
FileOpen2.flush();
FileOpen2.close();
}

//Graph
mglGraph Plot3D;
Plot3D.SetSize(1680,1050);
Plot3D.SetFontSize(2);

//Containers
int nop = residuals.n_rows;
mglData x(nop);
mglData y(nop);
mglData z(nop);

//Place Data in Cotainers
for(int i = 0; i <= nop -1; i++)
    {
    x.a[i] = residuals(i,0);
    y.a[i] = residuals(i,1);
    z.a[i] = residuals(i,2);
    }

//Plot
//Range
arma::vec maxvalues; maxvalues.set_size(3);
arma::vec minvalues; minvalues.set_size(3);
maxvalues = (max(residuals).t());
minvalues = (min(residuals).t());

Plot3D.SetRange('x',minvalues[0],maxvalues[0]);
Plot3D.SetRange('y',minvalues[1],maxvalues[1]);
Plot3D.SetRange('z',minvalues[2],maxvalues[2]);
Plot3D.SetRange('c',minvalues[2],maxvalues[2]);

Plot3D.Light(true);  Plot3D.Rotate(50,10);
Plot3D.Axis();       Plot3D.Box();

Plot3D.Label('x',"\\i{cm}",1);
Plot3D.Label('y',"\\i{cm}",1);
Plot3D.Label('z',"\\i{cm}",1);

Plot3D.Colorbar();
Plot3D.Puts(mglPoint(360,68),"\\i{cm}");
Plot3D.Crust(x,y,z);

//Window to show Plot
QMainWindow *Wnd = new QMainWindow();
Wnd->resize(850,680);
Wnd->setWindowTitle("Title");
QScrollArea *scroll = new QScrollArea(Wnd);

//Setup QMathGL
QMathGL *QMGL = new QMathGL(Wnd);
QSpinBox *tet;
QSpinBox *phi;
QMenu *popup;

popup = mglMakeMenu(Wnd,QMGL, tet, phi);
QMGL->setGraph(&Plot3D);
QMGL->setPopup(popup);
QMGL->update();

  //window & menu
  scroll->setWidget(QMGL);
  Wnd->setCentralWidget(scroll);
  Wnd->show();

}

我使用此QMenu创建菜单，效果很好，但是按钮尚无功能。 我的问题是，实现所有菜单按钮功能的最佳方法是什么？在哪里？

对不起，很长的帖子

提前致谢！

Answer 1

您将需要类似下面提供的代码的东西。

mainwindow.h

    // ...
 private slots:
     void newFile();
     void open();
     void save();
     void print();
     void undo();
     void redo();
     void cut();
     void copy();
     void paste();
     void about();
     void aboutQt();

 private:
     void createActions();
     void createMenus();

     QMenu *fileMenu;
     QMenu *editMenu;
     QMenu *formatMenu;
     QMenu *helpMenu;
     QAction *newAct;
     QAction *openAct;
     QAction *saveAct;
     QAction *printAct;
     QAction *exitAct;
     QAction *undoAct;
     QAction *redoAct;
     QAction *cutAct;
     QAction *copyAct;
     QAction *pasteAct;
     QAction *aboutAct;
     QAction *aboutQtAct;
     // ...

主窗口

 void MainWindow::createActions()
 {
     newAct = new QAction(tr("&New"), this);
     newAct->setShortcuts(QKeySequence::New);
     newAct->setStatusTip(tr("Create a new file"));
     connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));

     openAct = new QAction(tr("&Open..."), this);
     openAct->setShortcuts(QKeySequence::Open);
     openAct->setStatusTip(tr("Open an existing file"));
     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

     saveAct = new QAction(tr("&Save"), this);
     saveAct->setShortcuts(QKeySequence::Save);
     saveAct->setStatusTip(tr("Save the document to disk"));
     connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));

     printAct = new QAction(tr("&Print..."), this);
     printAct->setShortcuts(QKeySequence::Print);
     printAct->setStatusTip(tr("Print the document"));
     connect(printAct, SIGNAL(triggered()), this, SLOT(print()));

     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcuts(QKeySequence::Quit);
     exitAct->setStatusTip(tr("Exit the application"));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     undoAct = new QAction(tr("&Undo"), this);
     undoAct->setShortcuts(QKeySequence::Undo);
     undoAct->setStatusTip(tr("Undo the last operation"));
     connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));

     redoAct = new QAction(tr("&Redo"), this);
     redoAct->setShortcuts(QKeySequence::Redo);
     redoAct->setStatusTip(tr("Redo the last operation"));
     connect(redoAct, SIGNAL(triggered()), this, SLOT(redo()));

     cutAct = new QAction(tr("Cu&t"), this);
     cutAct->setShortcuts(QKeySequence::Cut);
     cutAct->setStatusTip(tr("Cut the current selection's contents to the "
                             "clipboard"));
     connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));

     copyAct = new QAction(tr("&Copy"), this);
     copyAct->setShortcuts(QKeySequence::Copy);
     copyAct->setStatusTip(tr("Copy the current selection's contents to the "
                              "clipboard"));
     connect(copyAct, SIGNAL(triggered()), this, SLOT(copy()));

     pasteAct = new QAction(tr("&Paste"), this);
     pasteAct->setShortcuts(QKeySequence::Paste);
     pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
                               "selection"));
     connect(pasteAct, SIGNAL(triggered()), this, SLOT(paste()));

     aboutAct = new QAction(tr("&About"), this);
     aboutAct->setStatusTip(tr("Show the application's About box"));
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
     // ...
}

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(newAct);
     fileMenu->addAction(openAct);
     fileMenu->addAction(saveAct);
     fileMenu->addAction(printAct);
     fileMenu->addSeparator();
     fileMenu->addAction(exitAct);

     editMenu = menuBar()->addMenu(tr("&Edit"));
     editMenu->addAction(undoAct);
     editMenu->addAction(redoAct);
     editMenu->addSeparator();
     editMenu->addAction(cutAct);
     editMenu->addAction(copyAct);
     editMenu->addAction(pasteAct);
     editMenu->addSeparator();

     helpMenu = menuBar()->addMenu(tr("&Help"));
     helpMenu->addAction(aboutAct);
     helpMenu->addAction(aboutQtAct);

    }

// ...

有关详细信息，请参见以下QMenu示例：

http://www.trinitydesktop.org/docs/qt4/mainwindows-menus.html

综上所述，您可能想尝试QML用于新的基于Qt的应用程序。