Paint a rectangle on QMainwindow , Qmainwindow has an image setup as background

[sandeep_hyd123]

Hello Guys,
I am new to Qt , struggling a bit to get a start. Here is a situation where I want a rectangle drawn on Qmainwindow which already has its background filled with an image. Following the suggestions given on previous threads I created a widget where I drew this rectangle and later set this up as central widget.But I cudn't see any rectangle on my Qwindow. Please help me.

Qt 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();
}

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

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

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Qt mainwindow.cpp:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include"QWidget"
#include <QtGui>
#include "QPixmap"
 
class MyWidget : public QWidget
{
public:
    MyWidget();
 
protected:
    void paintEvent(QPaintEvent *);
};
 
MyWidget::MyWidget()
{
    QPalette palette(MyWidget::palette());
    palette.setColor(backgroundRole(), Qt::white);
    setPalette(palette);
}
 
void MyWidget::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setPen(Qt::darkGreen);
    painter.drawRect(1, 2, 6, 4);
 
    painter.setPen(Qt::darkGray);
    painter.drawLine(2, 8, 6, 2);
}
 
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
   setStyleSheet("MainWindow {border-width: 4px; border-image:url('/Users/sandeep_hyd123/Qt sandy/first/photo.jpeg') 4 4 4 4 stretch stretch;}");
 
    MyWidget my_widget;
 
   QWidget::setFixedSize ( 400, 400 );
    QMainWindow::setCentralWidget(&my_widget);
 
 }
 
MainWindow::~MainWindow()
{
    delete ui;
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include"QWidget"
#include <QtGui>
#include "QPixmap"

class MyWidget : public QWidget
{
public:
    MyWidget();

protected:
    void paintEvent(QPaintEvent *);
};

MyWidget::MyWidget()
{
    QPalette palette(MyWidget::palette());
    palette.setColor(backgroundRole(), Qt::white);
    setPalette(palette);
}

void MyWidget::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setPen(Qt::darkGreen);
    painter.drawRect(1, 2, 6, 4);

    painter.setPen(Qt::darkGray);
    painter.drawLine(2, 8, 6, 2);
}



MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    
   setStyleSheet("MainWindow {border-width: 4px; border-image:url('/Users/sandeep_hyd123/Qt sandy/first/photo.jpeg') 4 4 4 4 stretch stretch;}");

    MyWidget my_widget;

   QWidget::setFixedSize ( 400, 400 );
    QMainWindow::setCentralWidget(&my_widget);

 }

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

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