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.
Solution
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);
OTHER TIPS
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.
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