@raven-worx

I tried the following but didn't work out..

QGraphicsPixmapItem* item = new QGraphicsPixmapItem(QPixmap::fromImage(qImage, Qt::AutoColor)); m_ViewerScene->addItem(item); QGraphicsRectItem* rect = new QGraphicsRectItem(m_BoundingBox); m_ViewerScene->addItem(rect); rect->setParentItem(item); m_ViewerScene->update(); //add the resized QGraphicsPixmapItem to the pixmap item->setPixmap( item->pixmap().scaled(QSize(128, 32),Qt::IgnoreAspectRatio, Qt::SmoothTransformation)); qInfo()<<"Rect resize props:::"<<item->childItems()[0]->boundingRect(); m_BoundingBox = item->childItems()[0]->boundingRect();

later I'm drawing box, on the image in an other viewer, with m_BoundingBox.

0_1527498444379_Untitled.png
The grey area within the blue rectangle will be resized to 128 * 32, and then the red rectangle would be added on the resized image. How to get the co-ordinates of red rect on the resized image?

Hi @wthung, I don't think this forum supports file uploads.

Can you create a simple example that demonstrates the memory leak? Just post the code here, no need to upload an attachment.

@JEllery

Thanks so much for solving this. It seems to solve my deletion-crash issue as well. :)

Hi
I just keep a pointer to the "white lines" and adjust if i move yellow.

class ColorItem : public QGraphicsItem { .. ConnectorLine* line = nullptr; .. protected: QVariant itemChange(GraphicsItemChange change, const QVariant& value) override { if (change == ItemPositionChange && scene()) { if (line) { line->adjust(); } } return QGraphicsItem::itemChange(change, value); } private: QColor color; };

line->Adjust() alters its endpoints. You could just adjust it directly here.

You're welcome !

Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)

What do you think about this?

int length = this->boundingRect().width(); length = (int)(((double)length * (double)value) / 100.0); QPixmap pix(this->boundingRect().width() - length, this->boundingRect().height()); pix.fill(Qt::transparent); QPainter p; p.begin(&pix); p.fillRect(pix.rect(), QColor(0, 0, 0, 120)); p.end(); gauge->setPixmap(pix); gauge->setPos(pos().x()+length, pos().y());

It works fine and the effect is the same as on example pixtures above.

:D
I haven't had much time to test if the bug exists in Qt5. I'll check it out and update the topic accordingly. If the bug is still there, of course, I will submit the fix.

Thanks for your time.

Its not moving the pointer that is making it work. It is the QRect that I created to test. If I comment out
the rect it all goes back to not moving and only being created at 0,0

@Wieland Wow you are just killing it today for me aren't you? Haha. I'll judge which is best for me a give it a roll.

Thanks a bunch (again)!

EDIT:

I ended up going for the event filter route and it works beautifully. Other than the exact syntax the approach also feels pretty intuitive which I like.

I had the same problem with items moving rightward as I stretched the window/viewport beyond the scene rect. This fixed it:

view->setAlignment( Qt::AlignLeft | Qt::AlignTop );

@Joel-Bodenmann
That's the manual way i talked about uptop but thanks anyways :)
It reassures me that i'm not "re-inventing" the wheel by applying this method .

Yep , fixed !!

Biggest achievement of ma layf.

Topic->setAsSolvedPolicy(Qt::AlwaysTrue);

I'd recommend reading this article which explains everything fairly well: Coordinate System

As the article explains, each graphics item maintains it's own coordinate system. The methods you are referring to are used to translate coordinates between those items, between the items and the scene and so on.
I hope that reading that article will help, otherwise feel free to ask if clarification is needed.

I had misconfigured ensureVisible's margins , and the view's size and the scene's rect .
Now it works fine :)

ok will do

@LoPiTaL
you could still combine both styles in one CSS. You just need to adapt your selectors.
E.g. you could set an property to your widgets and only apply certain styles to them.