Qt display image.

There are many ways to display images using QT

Roughly

Label

Directly draw

Container display

 

1 --------------- display GIF image (displayed on label)

Http://archive.cnblogs.com/a/2053701/

 

To display GIF images in QT, you cannot simply add parts.

You also need to manually write the program.

Tool: QT creator

To create a new project, add a qlabel component in the designer.

For example:

Scale the qlabel to an appropriate size.

Add the following program to the CPP function:

# Include "widget. H"
# Include "ui_widget.h"
# Include <qlabel>
# Include <qmovie>

Widget: widget (qwidget * parent ):
Qwidget (parent ),
UI (new UI: widget)
{
UI-> setupui (this );
Qmovie * movie = new qmovie ("D:/project/QT/testclass/2.gif ");
UI-> label-> setmovie (movie );
Movie-> Start ();
}

Widget ::~ Widget ()
{
Delete UI;
}

For example:

Note the path name in qmovie: "D:/project/QT/testclass/2.gif". The path slash here is opposite to that in Windows. The default path is a backslash in windows.

Compile and run the GIF file.

For example:

When the document GIF image is displayed:

# Include <qtgui/qapplication>
# Include <qlabel>
# Include <qmovie>

Int main (INT argc, char * argv [])
{
Qapplication app (argc, argv );

Qlabel * label = new qlabel ();
Qmovie * movie = new qmovie ("D:/project/QT/firstqt/2.gif ");
Label-> setmovie (movie );
Movie-> Start ();
Label-> show ();

Return app.exe C ();
}

 

2 --------------------------- the image is displayed on the label ------------------

 

Put your label.png on the top of the project directory and directly
Qpixmap pixmap ("label.png ");

UI-> title_label-> setpixmap (pixmap );

UI-> title_label-> show ();

 

---

You can directly:
Label-> setpixmap (qpixmap ("./pic.jpg "));

Or:
Qimage * image = new qimage ("./pic.jpg ");
Label-> setpixmap (qpixmap: fromimage (image ));

Or change an image in the middle:
Qimage * image = new qimage ("./pic1.jpg ");
Label-> setpixmap (qpixmap: fromimage (image ));
...........
Image-> load ("./pic2.jpg ");

 

3 ---------- draw an image directly -------------------------

Voidlogindlg: paintevent (qpaintevent *)

{

QPainterpainter(this);

QPixmappix;

pix.load("D:/QT/login/login/images/delta.png");

painter.drawPixmap(0,0,100,33,pix);

//painter.drawLine(0,0,100,100);

}

 

 

 

 

4 ----------- pictures of the program at startup

 

Qapplication app (argc, argv );
Qsplashscreen * splash = new qsplashscreen;
Splash-> setpixmap (qpixmap (":/images/splash.png"); // sets the image
Splash-> show (); // display the image
Qt: Alignment topright = QT: alignright | QT: aligntop;
Splash-> showmessage (qobject: TR ("setting up the main window..."), topright, QT: White); // display information
Mainwindow mainwin;
Splash-> showmessage (qobject: TR ("Loading modules ..."),
Topright, QT: White); // display information
Loadmodules ();
Splash-> showmessage (qobject: TR ("establishing connections ..."),
Topright, QT: White); // display information
Establishconnections ();
Mainwin. Show ();
Splash-> finish (& mainwin); // The image is always displayed until the mainwin loading is complete.
Delete Splash; // release space to save memory
Return app.exe C (); from: Example
The methods for loading images for different parts are also different, for example:
Qlabel:
C/C ++ code
Qstring strpath = ImagePath. Value (day); // image path
Qpixmap pix (strpath );
Daylabel-> setpixmap (pix );

Qpushbutton:
C/C ++ code
Button-> seticon (qicon ("toolbutton.png "));
Button-> seticonsize (qsize (48, 48 ));

The seticonsize function is used to capture the display area of an image. If this function is not available, the image is scaled and placed on the image.
Use a palette to load images:
C/C ++ code
Qpalette P = palette ();
P. setbrush (qpalette: button, qbrush (qpixmap ("toolbutton.png ")));
Setpalette (P );

In addition, the buttons are transparent:
C/C ++ code
Button-> setflat (true );

You can also use the event rendering function:
C/C ++ code
Qpixmap arrayimage ("/home/image/array.png"); // image path
Qrect arrayrect (, 50, 50); // capture the image area
Qpainter painter;
Painter. drawpixmap (qpoint (100,100), arrayimage, arrayrect); // print the image