problem with "painter->drawImage" in paint() from QGraphicsRectItem

louloulou

Hello,

I try to draw on image on a QGraphicsScene and it doesn't work. I create an Object "MobileUnit::MobileUnit() : QGraphicsRectItem()", and this object should load an image but it doesn't work. I can draw a rectangle but not load an image and I don't understand why ?

Thank you for your help.

void MobileUnit::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{

//work draw rectangle
/*QPen pen(Qt::black, 3);
painter->setPen(pen);
QRectF rect=QRectF(0,0,70,70);
painter->drawRect(rect);*/

//doesn't work
painter->setPen(Qt::NoPen);
QImage img;
img.load("qrc:/../images/aircraft2.png");
QRectF r;
r.setRect(0,0,img.width(),img.height());
painter->drawImage(r,img);

}

SGaist

Hi and welcome to devnet,

@louloulou said in problem with "painter->drawImage" in paint() from QGraphicsRectItem:

img.load("qrc:/../images/aircraft2.png");

That path looks suspicious.

Please take a look at the Qt Resources system documentation to see how the path are handled.

louloulou

@SGaist said in problem with "painter->drawImage" in paint() from QGraphicsRectItem:

looks suspici

Thank you it works.

I didn't think about it, but yes apparently my path is broken. I change with :

img.load("qrc:/../images/aircraft2.png"); // doesn't work
img.load("../images/aircraft2.png"); //work

and now it works. I feel stupid. I have a file "resources.qrc" that have the path to my image, why I cannot give the path this way "qrc:/../images/aircraft2.png" and I have to give the path this way "../images/aircraft2.png" ?

SGaist

Because that path is wrong. You are referencing the images as if it was on your file system. That's the issue.