GraphicsView Foreground

[augusbas]

Hi all,

I have sub-classed graphics view and i have implemented "draw foreground" function ..I need to draw ellipse's on the view foreground...Provided my code for reference .

Header File:

#include <QGraphicsView>
 
class MyView: public QGraphicsView
{
     Q_OBJECT
 
    public:
 
   MyView(QWidget *parent = 0);
 
    protected:
 
    void drawForeground(QPainter * painter, const QRectF & rect);
 
 
};

#include <QGraphicsView>

class MyView: public QGraphicsView
{
     Q_OBJECT

    public:

   MyView(QWidget *parent = 0);

    protected:

    void drawForeground(QPainter * painter, const QRectF & rect);


};

To copy to clipboard, switch view to plain text mode 

Source File:

#include <QtGui>
#include <QX11Info>
 
#include "graphics.h"
 
 
MyView::MyView(QWidget *parent) : QGraphicsView(parent)
 
{
 
 
   //--- Graphics View Properties
 
   this->resize ( 768, 768 );
 
 
 
   this->setStyleSheet("background-image: url(/aegean-120km.png)");
 
/*
 
   QGraphicsScene scene;
 
   scene.setSceneRect (0,0, 768, 768 );
 
   this->setScene ( &scene );
 
*/
 
   QColor color(Qt::yellow);
 
   QBrush brush(color, Qt::SolidPattern);
 
   this->setForegroundBrush(brush);
 
 
   this->show();
 
 
 
 
}
 
 
void MyView::drawForeground(QPainter * painter, const QRectF & rect)
{
 
      QColor color1(156, 189, 176,254);
 
      painter->setPen(Qt::lightGray);                 
 
      int x,y,w,h,i;
 
      double centre_x=384, centre_y=384;
 
      double step_size=38.5; 
 
      for(i=1;i<=20 ;i++)
      {
        	x = centre_x - step_size * i ;
        	y = centre_y - step_size * i ;
 
       		w=h=step_size * i * 2;
 
        	painter->drawEllipse(x,y,w,h);
       }   
 
}

#include <QtGui>
#include <QX11Info>

#include "graphics.h"


MyView::MyView(QWidget *parent) : QGraphicsView(parent)

{

   
   //--- Graphics View Properties

   this->resize ( 768, 768 );



   this->setStyleSheet("background-image: url(/aegean-120km.png)");

/*

   QGraphicsScene scene;

   scene.setSceneRect (0,0, 768, 768 );

   this->setScene ( &scene );

*/

   QColor color(Qt::yellow);

   QBrush brush(color, Qt::SolidPattern);

   this->setForegroundBrush(brush);
 

   this->show();
  



}


void MyView::drawForeground(QPainter * painter, const QRectF & rect)
{

      QColor color1(156, 189, 176,254);

      painter->setPen(Qt::lightGray);                 

      int x,y,w,h,i;

      double centre_x=384, centre_y=384;
  
      double step_size=38.5; 

      for(i=1;i<=20 ;i++)
      {
        	x = centre_x - step_size * i ;
        	y = centre_y - step_size * i ;

       		w=h=step_size * i * 2;

        	painter->drawEllipse(x,y,w,h);
       }   

}

To copy to clipboard, switch view to plain text mode 

I didn't get any ellipse on the foreground ....By ref to manual Whether "draw foreground " function will be applicable only to QGraphicsScene ? how the draw foreground function will get called, automatically or any update mechanism need to be added in the code ...

Please advise..