Paint widget with high resolution to file

gde23

Hello,

I am trying to get something like a screenshot but rendered with a higher resolution. How can this be achieved?

void MainWindow::saveGuiScreenshot()
{
    const int increasRes = 2;
    QSize size = QSize(increasRes*width(), increasRes*height());
    QImage img = QImage(size, QImage::Format_ARGB32);
    // some method to scale the widget required here
    QPainter painter(&img);
    render(&painter);
    img.save("/home/user/Desktop/test.png");
}

mrjj

@gde23
Hi
You also have to scale MainWindow before calling render
or else it will render in its current size.
like resize(size)

However, that might suck so hang on a moment while i try to
use the painter scale and see if that works.

yep:
painter.scale(2,2);
did exactly what i hoped for.

void MainWindow::on_pushButton_3_clicked()
{

    const int increasRes = 2;
    QSize size = QSize(increasRes * width(), increasRes * height());
    QImage img = QImage(size, QImage::Format_ARGB32);
    QPainter painter(&img);
    painter.scale(2,2);
    render(&painter);
    img.save("e:/test.png");

}

and quality is good.

gde23

@mrjj Thanks a lot. That is exactly what I was looking for.