How i can plot result in my GUI ?

[FelixB]

your code can't work. why do you clear the points-vector in each loop? I already gave you the solution how to fix that...

remember:

QPolygonF polygon;
for(unsigned int i=0; i<10; i++)
polygon << function();
 
curve->setSamples(polygon);

QPolygonF polygon;
for(unsigned int i=0; i<10; i++)
polygon << function();
 
curve->setSamples(polygon);

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and you don't need to call "myplot->show()" in plotValuesFromFunction, it's sufficient to do that once in the constructor.

PS: you already opened one thread for this topic. it's very bad style to create a second thread only because nobody answers in your first thread.

[21did21]

i clear previous point because i want:
=> run calcul and get 1point
=> plot this point
=> run calcul and get 1 point
=> plot this point
....
for each points

and i don't want a polynom, i just want a plot with only points. (Dots style; i think )

ps: I made this post because the other start to be very rough and can not distinguish what I was looking for

[FelixB]

it makes no difference whether you use a polygon or a vector. that has no effect on the style. you can set the style by using "QwtPlotCurve::setStyle (CurveStyle style)".

you plot exactly one point after each calculation. the previously calculated (and plotted) points will be deleted. is that really what you want? or do you want to keep all points in the plot?

[21did21]

it makes no difference whether you use a polygon or a vector. that has no effect on the style. you can set the style by using "QwtPlotCurve::setStyle (CurveStyle style)".

ok . thank you

you plot exactly one point after each calculation. the previously calculated (and plotted) points will be deleted. is that really what you want? or do you want to keep all points in the plot?

ok! i understand why i must not clear the vector!
=> yes i want to plot one point and keep the previous

thank you for yur help

=> i try, and i will keep informed

EDIT:
i think now i understand the mistake, i try it and i will keep you informed

[21did21]

i do something better, but it style don't work....

main.cpp

#include <QApplication>
#include "MyMainWindow.h"
#include <QGridLayout>
#include "RunSimulation.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MyMainWindow fenetre;
    fenetre.show();
    return app.exec();
}

#include <QApplication>
#include "MyMainWindow.h"
#include <QGridLayout>
#include "RunSimulation.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MyMainWindow fenetre;
    fenetre.show();
    return app.exec();
}

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MyMainWindow

-------------------.h-----------------
#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QMessageBox>
#include <qwt_plot_curve.h>
#include <qwt_plot.h>
class MyMainWindow : public QWidget
{
    Q_OBJECT
public:
    explicit MyMainWindow(QWidget* parent = 0);
    void plotValuesFromFunction(std::vector< std::vector<double> >);
public slots:
    void myRunSlot();
private:
    QPushButton *BUTTONRun;
    QPushButton *BUTTONQuit;
    QPushButton *BUTTONAbout;
    QPushButton *BUTTONContact;
    QwtPlot *myPlot1;
    QwtPlot *myPlot2;
    QwtPlotCurve myCurve1;
    QwtPlotCurve myCurve2;
};
#endif // MYMAINWINDOW_H
--------------.cpp--------------------------
#include "MyMainWindow.h"
#include <QGridLayout>
#include <QHBoxLayout>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <qwt_symbol.h> //for symbol in the curve
#include "RunSimulation.h"
#include <vector>
using namespace std;
MyMainWindow::MyMainWindow(QWidget* parent) : QWidget(parent)
{
    QGridLayout* mainLayout = new QGridLayout();
    setLayout(mainLayout);
    myPlot1 = new QwtPlot();
    myPlot2 = new QwtPlot();
    myPlot1->setMinimumSize(200, 100);
    myPlot2->setMinimumSize(200, 100);
    QWidget* buttonWidget = new QWidget();
    QGridLayout* buttonLayout = new QGridLayout();
    BUTTONRun = new QPushButton("RUN");
    BUTTONQuit = new QPushButton("STOP");
    BUTTONAbout = new QPushButton("About");
    BUTTONContact = new QPushButton("Contact");
    buttonLayout->addWidget(BUTTONRun    ,0,1);
    buttonLayout->addWidget(BUTTONQuit   ,1,1);
    buttonLayout->addWidget(BUTTONAbout  ,2,1);
    buttonLayout->addWidget(BUTTONContact,3,1);
    buttonWidget->setLayout(buttonLayout);
    mainLayout->addWidget(myPlot1      ,0,0,1,1);
    mainLayout->addWidget(myPlot2      ,0,1,1,1);
    mainLayout->addWidget(buttonWidget ,0,3,1,1);
    myCurve1.attach(myPlot1);
    myCurve2.attach(myPlot2);
    QObject::connect(BUTTONQuit, SIGNAL(clicked()), qApp, SLOT(quit()));
    QObject::connect(BUTTONAbout, SIGNAL(clicked()), qApp, SLOT(aboutQt()));
	QObject::connect(BUTTONRun, SIGNAL(clicked()), this, SLOT(myRunSlot()));
}
void MyMainWindow::plotValuesFromFunction(vector< vector<double> > Points_OneXtwoY)
{
    int sizeOfVector=Points_OneXtwoY[0].size();
    QVector<double> x(sizeOfVector);
    QVector<double> y(sizeOfVector);
    for (int z=0;z<sizeOfVector;z++)
    {
        x.append( Points_OneXtwoY[0][z] );
        y.append( Points_OneXtwoY[1][z] );
    }
    myPlot1->replot();
    myPlot2->replot();
    myCurve1.setSamples(x.data(),y.data(),x.size());
    myCurve2.setSamples(x.data(),y.data(),x.size());
    myPlot1->show();
    myPlot2->show();
}
void MyMainWindow::myRunSlot()
{
    RunSimulation(this); //this
}

-------------------.h-----------------
#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QMessageBox>
#include <qwt_plot_curve.h>
#include <qwt_plot.h>
class MyMainWindow : public QWidget
{
    Q_OBJECT
public:
    explicit MyMainWindow(QWidget* parent = 0);
    void plotValuesFromFunction(std::vector< std::vector<double> >);
public slots:
    void myRunSlot();
private:
    QPushButton *BUTTONRun;
    QPushButton *BUTTONQuit;
    QPushButton *BUTTONAbout;
    QPushButton *BUTTONContact;
    QwtPlot *myPlot1;
    QwtPlot *myPlot2;
    QwtPlotCurve myCurve1;
    QwtPlotCurve myCurve2;
};
#endif // MYMAINWINDOW_H
--------------.cpp--------------------------
#include "MyMainWindow.h"
#include <QGridLayout>
#include <QHBoxLayout>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <qwt_symbol.h> //for symbol in the curve
#include "RunSimulation.h"
#include <vector>
using namespace std;
MyMainWindow::MyMainWindow(QWidget* parent) : QWidget(parent)
{
    QGridLayout* mainLayout = new QGridLayout();
    setLayout(mainLayout);
    myPlot1 = new QwtPlot();
    myPlot2 = new QwtPlot();
    myPlot1->setMinimumSize(200, 100);
    myPlot2->setMinimumSize(200, 100);
    QWidget* buttonWidget = new QWidget();
    QGridLayout* buttonLayout = new QGridLayout();
    BUTTONRun = new QPushButton("RUN");
    BUTTONQuit = new QPushButton("STOP");
    BUTTONAbout = new QPushButton("About");
    BUTTONContact = new QPushButton("Contact");
    buttonLayout->addWidget(BUTTONRun    ,0,1);
    buttonLayout->addWidget(BUTTONQuit   ,1,1);
    buttonLayout->addWidget(BUTTONAbout  ,2,1);
    buttonLayout->addWidget(BUTTONContact,3,1);
    buttonWidget->setLayout(buttonLayout);
    mainLayout->addWidget(myPlot1      ,0,0,1,1);
    mainLayout->addWidget(myPlot2      ,0,1,1,1);
    mainLayout->addWidget(buttonWidget ,0,3,1,1);
    myCurve1.attach(myPlot1);
    myCurve2.attach(myPlot2);
    QObject::connect(BUTTONQuit, SIGNAL(clicked()), qApp, SLOT(quit()));
    QObject::connect(BUTTONAbout, SIGNAL(clicked()), qApp, SLOT(aboutQt()));
	QObject::connect(BUTTONRun, SIGNAL(clicked()), this, SLOT(myRunSlot()));
}
void MyMainWindow::plotValuesFromFunction(vector< vector<double> > Points_OneXtwoY)
{
    int sizeOfVector=Points_OneXtwoY[0].size();
    QVector<double> x(sizeOfVector);
    QVector<double> y(sizeOfVector);
    for (int z=0;z<sizeOfVector;z++)
    {
        x.append( Points_OneXtwoY[0][z] );
        y.append( Points_OneXtwoY[1][z] );
    }
    myPlot1->replot();
    myPlot2->replot();
    myCurve1.setSamples(x.data(),y.data(),x.size());
    myCurve2.setSamples(x.data(),y.data(),x.size());
    myPlot1->show();
    myPlot2->show();
}
void MyMainWindow::myRunSlot()
{
    RunSimulation(this); //this
}

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RunSimulation

------------------.h---------------------
#ifndef RUNSIMULATION_H
#define RUNSIMULATION_H
#include "MyMainWindow.h"
void RunSimulation(MyMainWindow *fenetre);
#endif // RUNSIMULATION_H
------------------.cpp-------------------
#include <QApplication>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <vector>
#include "function.h"
#include "RunSimulation.h"
#include "MyMainWindow.h"
using namespace std;
void RunSimulation(MyMainWindow *fenetre)
{
    vector<double> coordX;
    vector<double> coordY;
    vector< vector<double> >coordX_Y;
    coordX_Y.push_back(coordX);
    coordX_Y.push_back(coordY);
    vector<double> points;
    for (int i=1;i<10;i++)
    {
        points.clear();
        points=function();
        coordX_Y[0].push_back(points[0]);
        coordX_Y[1].push_back(points[1]);
        fenetre->plotValuesFromFunction(coordX_Y);
    }
}

------------------.h---------------------
#ifndef RUNSIMULATION_H
#define RUNSIMULATION_H
#include "MyMainWindow.h"
void RunSimulation(MyMainWindow *fenetre);
#endif // RUNSIMULATION_H
------------------.cpp-------------------
#include <QApplication>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <vector>
#include "function.h"
#include "RunSimulation.h"
#include "MyMainWindow.h"
using namespace std;
void RunSimulation(MyMainWindow *fenetre)
{
    vector<double> coordX;
    vector<double> coordY;
    vector< vector<double> >coordX_Y;
    coordX_Y.push_back(coordX);
    coordX_Y.push_back(coordY);
    vector<double> points;
    for (int i=1;i<10;i++)
    {
        points.clear();
        points=function();
        coordX_Y[0].push_back(points[0]);
        coordX_Y[1].push_back(points[1]);
        fenetre->plotValuesFromFunction(coordX_Y);
    }
}

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function

----------------.h------------------
#ifndef FUNCTION_HPP
#define FUNCTION_HPP
std::vector<double>  function();
#endif // FUNCTION_HPP
-----------------.cpp---------------
#include <vector>
#include <ctime> // to generate random point
#include <cstdlib> // to generate random point
#include "function.h"
#include "windows.h"
using namespace std;
vector<double>  function()
{
    vector<double> ppoints;
    ppoints.clear();
    //----------------
    srand(time(0));
    Sleep(1000);
    //----------------
    ppoints.push_back(rand() % 1800);
    ppoints.push_back(rand() % 500);
    return ppoints;
}

----------------.h------------------
#ifndef FUNCTION_HPP
#define FUNCTION_HPP
std::vector<double>  function();
#endif // FUNCTION_HPP
-----------------.cpp---------------
#include <vector>
#include <ctime> // to generate random point
#include <cstdlib> // to generate random point
#include "function.h"
#include "windows.h"
using namespace std;
vector<double>  function()
{
    vector<double> ppoints;
    ppoints.clear();
    //----------------
    srand(time(0));
    Sleep(1000);
    //----------------
    ppoints.push_back(rand() % 1800);
    ppoints.push_back(rand() % 500);
    return ppoints;
}

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it still don't plot during the execution

[wysota]

Plotting a point doesn't cause an immediate repaint of the user interface. Events need to be processed so that Qt can ask your widget to repaint itself. Without that your loop runs continously and you will only see the final result. Please read the docs or search the forum for event processing and redrawing issues, it's a frequent problem.

[21did21]

Plotting a point doesn't cause an immediate repaint of the user interface. Events need to be processed so that Qt can ask your widget to repaint itself. Without that your loop runs continously and you will only see the final result. Please read the docs or search the forum for event processing and redrawing issues, it's a frequent problem.

thank you for this answer, but sorry i don't understand that you speak about.

can you reformulate please because i am not an english people.

i have two difficulty:
=> Qwt and the english language

EDIT:
if i understand, you say:
=> my programm is good but Qt have not time to replot correctly, so i just can see the final result ?
=> have you link which speaks about this to understand how i can resolve my problem?

[wysota]

Read about Qt's event processing in the documentation. As part of your lecture, have a look at the docs for QWidget::update().

[21did21]

i have add before this line:

myCurve1.setSamples(x.data(),y.data(),x.size());

myCurve1.setSamples(x.data(),y.data(),x.size());

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of my plot method the line:

update();

update();

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but it don't change something....

[wysota]

Why would it change anything? Did you read the documentation for the method carefully? Did you also read any other paragraphs on event processing in Qt?

[21did21]

yes but i don't understand very well the content...

it's too difficult for me, i don't understand why qt don't work correctly for this applciation

=> when i see the example from qwt then i see that ploting work during execution (see for example oscillopscope example; why this example work and not mine?)

EDIT:

i think it can work if i use Qwt function like replot() or restore... or something like this no?

a friend use C++ builder and it can do this easily, so why i can't with Qwt? i think it's easy command but i don't find the correct command and i don't understand where i have to put tjis command....

[wysota]

yes but i don't understand very well the content...

it's too difficult for me, i don't understand why qt don't work correctly for this applciation

Well, I'm sorry, I can't teach you to read with understanding. The docs for update() clearly state what your problem is. Your problem is very easy to solve but there is no point in giving you a ready solution if you wouldn't understand it. I can also point you to this article: [wiki]Keeping the GUI Responsive[/wiki] and suggest to take the "step by step" approach.

a friend use C++ builder and it can do this easily, so why i can't with Qwt?

Because Qt is event-driven and the other framework is not. Thanks to that Qt is fast and your friend's framework is not.

i think it's easy command but i don't find the correct command and i don't understand where i have to put tjis command....

What command?