How to use a png image as a QGraphicItem?

frnklu20

How can I do this?I don't want to use an allipse or a circle or a rect

mrjj

Hi
what about
https://doc.qt.io/qt-5/qgraphicspixmapitem.html
that would load png.

frnklu20

Oh yeah! But it gives me an error

QGraphicsPixmapItem *item = new QGraphicsPixmapItem(QPixmap("C:/Users/ILHA4/Desktop/trafo"), &scene);

It says:
"no matching constructor for initialization of 'QGraphicsPixmapItem'"

UPDATE:

dialog.h

#include <QGraphicsPixmapItem>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
...
        QGraphicsPixmapItem *item;
};

dialog.cpp

#include <QGraphicsPixmapItem>

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);

    scene= new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
    QBrush redBrush(Qt::red);
    QPen blackpen(Qt::black);
    
    item->setPixmap(QPixmap("C:/Users/ILHA4/Desktop/trafo"));
    scene->addItem(item);
    ellipse=scene->addEllipse(10,10,100,100,blackpen,redBrush);
    ellipse->setFlag(QGraphicsItem::ItemIsMovable);
}

When i do this the program unexpectedly finishes :(

UPDATE 2:

dialog.cpp

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{...

      QGraphicsPixmapItem *item=scene->addPixmap(QPixmap("C:/Users/ILHA4/Desktop/trafo"));
    item->setPos(50,50);
    scene->addItem(item);
}

It doesn't give me an error, but the item doesn't appear on the screen :(

SGaist

Hi,

@frnklu20 said in How to use a png image as a QGraphicItem?:

"C:/Users/ILHA4/Desktop/trafo"

That's pretty unusual for an image name. The extension is missing. Is that on purpose ?

frnklu20

thats the path of the image, where it is located on my computer

the name of the image is trafo, of high voltage transformer.

SGaist

What type of image is that ? Again, it's really unusual for an image file to not have an extension.

frnklu20

it's a png image, but if i do:

GraphicsPixmapItem *item=scene->addPixmap(QPixmap("C:/Users/ILHA4/Desktop/trafo.png"));

it doesn't work either, the image doesn't appear on the screen

SGaist

It that case, check whether the QPixmap is null.

frnklu20

Yes that's it, the path was wrong

Thanks man, you're awesome!