QT打印质量低下

Question

So I'm trying to print a window from my application, and use the following code:

QPrinter *printer = new QPrinter;

printer->setResolution(1200);

QPrintDialog *printDialog = new QPrintDialog(printer, this);

if (printDialog->exec() == QDialog::Accepted) {

    QPainter p(printer);

    QPixmap pm = QPixmap::grabWidget(this);

    p.drawPixmap(0,0,pm);
}

To test it I export the image to PDF, but what I get is very low resolution file. Any idea on how to make a high resolution zoomable image? Cause I am printing a graph which should be readable, as it has some small size values on it.

Answer 1

QPrinter is a subclass of QPaintDevice , thus you may try to use the following QWidget function which will draw directly at it:

void QWidget::​render(QPaintDevice * target,...)

Also there's a QPainter version of the same function if you'd like to create QPainter by yourself.