How can I rescale an image and set it to QWidget?

Question

QPixmap pic("../image.jpg");

setAutoFillBackground(true);
QPalette palette;
QPixmap scaled=pic.scaled ( 800, 480, Qt::IgnoreAspectRatio, Qt::FastTransformation );

palette.setBrush(QPalette::Window, QBrush(scaled));

//this->setPalette(palette);
QWidget *w= new QWidget(this);
w->setGeometry(0,0,800,480);
w->show();
w->setPalette(palette);

But the widget does not show any image.

Not entirely sure, but what happens if you use QPalette::Background instead? — Bart, Jan 10 '12 at 16:47

score 8 · Accepted Answer · answered Jan 10 '12 at 17:30

8

Are you just trying to show the scaled image in a widget? I don't think setting the image in the brush and then setting the brush in the palette is the correct approach.

You can just use a QLabel to show an image in a widget. Like this:

QPixmap pic("../image.png");
QPixmap scaled=pic.scaled ( 800, 480, Qt::IgnoreAspectRatio, Qt::FastTransformation );

QLabel *label = new QLabel(this);
label->setPixmap(scaled);

answered Jan 10 '12 at 17:30

Dusty Campbell

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but i want show some Qpushbuttons to widget when i used label button not working (becaose label are overlap the buttons) so i am try to show image as backgroung through widget – Thorin Jan 11 '12 at 06:57
if you just want to change the background check this question: http://stackoverflow.com/q/6406940/2174 – Dusty Campbell Jan 11 '12 at 20:44

score 0 · Answer 2 · edited Sep 19 '18 at 18:57

0

You are showing the widget before setting the palette. Try setting the palette first.

If that does not help, try specifying the full file path.

edited Sep 19 '18 at 18:57

mskfisher

3,291
4
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answered Sep 19 '18 at 16:14

Alex Prilutskiy

11

How can I rescale an image and set it to QWidget?

2 Answers2