Not able to connect to qwtplotWidget

[dheeraj]

Hi guy's.
I am trying to run a program in Qt4.3.3 with VS2005. But there is a problem.
I am using qwtplot widget on a .ui form QDialog and a pushButton called Draw on it.I only want to change the Title and the Scale of the Plot Widget.The project compiles with out an error and the form which i created is displayed but the scale and the Title don't change. The default qwtplot widget s only displayed. Here is the code pls see if you can help me.

----newplot.cpp------

#include "newplot.h"
#include <QtGui>
#include "qwt_plot.h"
#include "qwt_scale_widget.h"
newplot::newplot(QWidget *parent)
	: QDialog(parent)
{
	 setupUi(this);
        QwtPlot *myPlot; 
	 connect(drawButton, SIGNAL(clicked()), this, SLOT(draw()));
}
void newplot::on_drawButton_clicked()
{
}
void newplot::draw()
{
	 QwtText title( "Two Curves" );
	 myPlot = new QwtPlot();
 
   myPlot->setAxisTitle(QwtPlot::xBottom, "Time/seconds");
   myPlot->setAxisScale(QwtPlot::xBottom, 0, 100);
 
   myPlot->setAxisTitle(QwtPlot::yLeft, "Values");
   myPlot->setAxisScale(QwtPlot::yLeft, 0, 50);
   myPlot->replot();
 }

#include "newplot.h"
#include <QtGui>
#include "qwt_plot.h"
#include "qwt_scale_widget.h"
newplot::newplot(QWidget *parent)
	: QDialog(parent)
{
	 setupUi(this);
        QwtPlot *myPlot; 
	 connect(drawButton, SIGNAL(clicked()), this, SLOT(draw()));
}
void newplot::on_drawButton_clicked()
{
}
void newplot::draw()
{
	 QwtText title( "Two Curves" );
	 myPlot = new QwtPlot();

   myPlot->setAxisTitle(QwtPlot::xBottom, "Time/seconds");
   myPlot->setAxisScale(QwtPlot::xBottom, 0, 100);

   myPlot->setAxisTitle(QwtPlot::yLeft, "Values");
   myPlot->setAxisScale(QwtPlot::yLeft, 0, 50);
   myPlot->replot();
 }

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-----------newplot.h----------

#ifndef NEWPLOT_H
#define NEWPLOT_H
#include <QtGui/QDialog>
#include "ui_newplot.h"
#include "qwt_plot.h"
 
class newplot : public QDialog, public Ui::newplot
{
	Q_OBJECT
 
public:
	newplot(QWidget *parent = 0);
private slots:
	void on_drawButton_clicked();
	void draw();
};
#endif // NEWPLOT_H

#ifndef NEWPLOT_H
#define NEWPLOT_H
#include <QtGui/QDialog>
#include "ui_newplot.h"
#include "qwt_plot.h"

class newplot : public QDialog, public Ui::newplot
{
	Q_OBJECT

public:
	newplot(QWidget *parent = 0);
private slots:
	void on_drawButton_clicked();
	void draw();
};
#endif // NEWPLOT_H

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------------main.cpp----------

#include <QtGui/QApplication>
#include "newplot.h"
#include "ui_newplot.h"
#include "qwt_plot.h"
 
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	//Ui::newplotClass ui;
	newplot *dialog = new newplot;
	//ui.setupUi(dialog);
	dialog->show();
	return app.exec();
}

#include <QtGui/QApplication>
#include "newplot.h"
#include "ui_newplot.h"
#include "qwt_plot.h"

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	//Ui::newplotClass ui;
	newplot *dialog = new newplot;
	//ui.setupUi(dialog);
	dialog->show();
	return app.exec();
}

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Hey i am sorry i wanted to attach the .ui file but its a big file and i am allowed to upload a file size of max 19.5 kb. So i din attach it.

[Uwe]

newplot::draw creates an invisible new plot widget each time it is called.

Uwe

[dheeraj]

Hey Uwe thank you for the time. How do i modify the program to work with the .Ui form i created. I am not able to connect the code with the Form which i created.