"QT5 Development and examples" 13. Implement a simple text editor 2

Next we add the image zoom function for this project:

Add a slot function:

void Showzoomin ();    About the zoom function of a picture

Add the appropriate response connection

Connect (zoominaction, SIGNAL (triggered ()), this, SLOT (Showzoomin ())); To zoom in on a picture

The implementation of the slot function:

To achieve a picture enlargement void imageprocessor::showzoomin () {  //first determine if there is a photo  if (img.isnull ())    return;   No photos, then do not enlarge the  Qmatrix Martix;   A picture of the storage object  Martix.scale (2, 2);   Both length and width are magnified twice times  img = img.transformed (Martix);    The operation of the picture is implemented  showwidget->imagelabel->setpixmap (Qpixmap::fromimage (IMG));   Change the picture to put it back}

Similarly, add the Zoom Out feature:

The corresponding slot functions and connections are also added in front:

void Showzoomout ();   Picture shrinking

Connect (zoomoutaction, SIGNAL (triggered ()), this, SLOT (Showzoomout ())); Take a picture and put it small

void Imageprocessor::showzoomout () {  //first determine if there is a photo  if (img.isnull ())    return;   No photos, then do not enlarge the  Qmatrix Martix;   A picture of the storage object  Martix.scale (0.5, 0.5);   Both length and width are magnified twice times  img = img.transformed (Martix);    The operation of the picture is implemented  showwidget->imagelabel->setpixmap (Qpixmap::fromimage (IMG));   Change the picture to put it back}

Other specific code bases look ahead: http://blog.csdn.net/cutter_point/article/details/42839071

Operation Result: Original:

Button zoom: Zoom Out:

"QT5 Development and examples" 13. Implement a simple text editor 2