Quote Originally Posted by munna
can i see the code where you are doing this?
Here is the file:

Its the open() function which does the functioning.

Qt Code: 
  1. #include "imagezoomer.h"
  2. #include <QtGui>
  3. #include <qdir.h>
  4. #include <QColor>
  5.  
  6. ImageZoomer::ImageZoomer(Ui::MainWindow *_mwin): mwin(_mwin)
  7. {                         
  8.  
  9.      frame = new QFrame(mwin->centralwidget);
  10.      frame->setGeometry(QRect(60, 70, 591, 571));
  11.      frame->setFrameShape(QFrame::StyledPanel);
  12.      frame->setFrameShadow(QFrame::Plain);
  13.  
  14.      canvas = new Q3Canvas(500,500);
  15.      canview = new Q3CanvasView(frame);
  16.      canview->setCanvas(canvas);
  17.      canvas->setBackgroundColor(Qt::black);  
  18.  
  19.      resize(500, 400);
  20.      connect(mwin->actionOpen, SIGNAL(activated()), this, SLOT(open()));  
  21.  
  22. }
  23. ImageZoomer::~ImageZoomer()
  24. {
  25. }
  26.  
  27. void ImageZoomer::open()
  28. {
  29.      int x,y;
  30.      QString filename = QFileDialog::getOpenFileName(this, tr("Open File"),QDir::currentPath());
  31.  
  32.      if (!filename.isEmpty())
  33.      {
  34.             QImage image(filename);
  35.             if (image.isNull())
  36.             {
  37.                 QMessageBox::information(this, tr("Image Zoomer"),tr("Cannot load %1.").arg(filename));
  38.                 return;
  39.             }     
  40.      canvas->setBackgroundPixmap(QPixmap::fromImage(image));
  41.      scalefactor = 1.0;
  42.  
  43.      x = image.width();
  44.      y = image.height();
  45.  
  46.      canview->resizeContents(x,y);
  47.  
  48.      }
  49. }
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