Solved How can I draw a png image using QPixmap and QPainter?

[sofiane]

I'm trying to draw an image into my widget window, what is the right way of doing, the following code is not displaying anything on the window :

#include <QCoreApplication>
#include <QApplication>
#include <QWidget>
#include <QPainter>
#include <QColor>
#include <QRectF>
#include <QPicture>

class Win: public QWidget{
public:
    void paintEvent(QPaintEvent *){
        QPainter painter(this);

        QRectF target(10.0, 20.0, 800.0, 600.0);
        QRectF source(0.0, 0.0, 400.0, 400.0);
        QPixmap pixmap("qrc:/browser_web_internet_website.png");

        painter.drawPixmap(target, pixmap, source);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Win *win = new Win();

    win->show();
    return a.exec();
}

[SGaist]

QLabel

[SGaist]

Hi,

Check that your pixmap is valid.

[sofiane]

@SGaist What do you mean by valid? the image exists, what I mean by not working is that the window opens but not displaying anything.

[sofiane]

@SGaist It worked when I removed the qrc/, I wonder why, I always worked with qrc:/filename.png, now it required only :filename.png?

[SGaist]

No, it's always been ":/". AFAR, qrc:/ is used in QML and when using QUrl.

[sofiane]

@SGaist sorry for reopening the issue, I wanted to add a picture to a pre-existing QWidget object, is it possible to do that ? this method requires creating another class which inherits from qwidget, and implement the paintEvent, but I just want to add a picture to an already existing qwidget window.

[SGaist]

QLabel