Qt - How to set text on top of QLabel Image

user375566 picture user375566 · Nov 24, 2010 · Viewed 10.6k times · Source

I believe QPainter is used, but I can't figure out how to combine the two.

QLabel* imageLabel = new QLabel();
QImage image("c://image.png");
imageLabel->setPixmap(QPixmap::fromImage(image));
imageLabel->setAlignment(Qt::AlignCenter);

QPainter* painter = new QPainter();
painter->setPen(Qt::blue);
painter->setFont(QFont("Arial", 30));
painter->drawText(rect(), Qt::AlignCenter, "Text on Image");

Answer

bjoernz picture bjoernz · Nov 24, 2010

You need to tell the painter where to draw:

QImage image("c://image.png");

// tell the painter to draw on the QImage
QPainter* painter = new QPainter(&image); // sorry i forgot the "&"
painter->setPen(Qt::blue);
painter->setFont(QFont("Arial", 30));
// you probably want the to draw the text to the rect of the image
painter->drawText(image.rect(), Qt::AlignCenter, "Text on Image");

QLabel* imageLabel = new QLabel();
imageLabel->setPixmap(QPixmap::fromImage(image));
imageLabel->setAlignment(Qt::AlignCenter);