Several ways to add background images (scalable and rotatable) to each control in QT

http://blog.csdn.net/liukang325/article/details/44832397

1. Add background image to Qpushbutton: Background image can be scaled freely according to button size.

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2. void Setbuttonbackimage (Qpushbutton *button,qstring image,int Sizew, int sizeh)
4. {
6. //163,163 is the original resolution, which is slightly adjusted here.
8. Qpixmap pixmap (image);
10. Qpixmap fitpixmap=pixmap.scaled (163,163). Scaled (Sizew, Sizeh, Qt::ignoreaspectratio, qt::smoothtransformation);
12. Button->seticon (Qicon (Fitpixmap));
14. Button->seticonsize (Qsize (Sizew,sizeh));
16. Button->setflat (true); That's the way it works. Transparent button, useful when using PNG images
18. Button->setstylesheet ("border:0px"); Remove border, Cancel click Effect
20. }

2. Add background image to Qwidget: The image can be freely scaled.

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1. This->setautofillbackground (true);  //widget Add background image, this sentence must be.
2. Qpixmap Pixmap (":/images/bg_news.png");
3. Qpixmap fitpixmap=pixmap.scaled (+) scaled (CONFIG->MAINWINDOWW,CONFIG->MAINWINDOWH, Qt::I Gnoreaspectratio, qt::smoothtransformation);
4. Qpalette Palette;
5. Palette.setbrush (Qpalette::background, Qbrush (Fitpixmap));
6. This->setpalette (palette);

3. Add background image to Qlabel: The image can be freely scaled.

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1. Qpixmap Pixmap (Normalicon);
2. Qpixmap fitpixmap=pixmap.scaled (Labelicon->width (), Labelicon->height (), Qt::ignoreaspectratio, Qt:: Smoothtransformation);
3. Labelicon->setpixmap (FITPIXMAP);

4. Use QSS style, add background image, picture shows original proportions.

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1. Lastbtn->setstylesheet ("Background-image:url (:/images/btn_previous_normal.png); border:0px");

Qpixmap Rotate Picture:

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1. Qmatrix Leftmatrix;
2. Leftmatrix.rotate (270);
3. Ui->label->setpixmap (pixmap.transformed (leftmatrix,qt::smoothtransformation));

Several ways to add background images (scalable and rotatable) to each control in QT