QGraphicsRectItem moves out of the scene

sayan275

I have an Image Viewer, where I draw QGraphicsRectItem. The problem is the QGraphicsRectItem moves out of the scene. How can I fix the items within the sceneRect?

I add the rect items.

I moved the item left and it went out

This completely got scrambled as I resized the viewer, ie, QGraphicsViewer

resizeEvent has been overridden by as below,

QTransform matrix(1, 0, 0, 0, 1, 0, 0, 0, 1);
matrix.scale(width() / sceneRect().width(), height() / sceneRect().height());
setTransform(matrix);

What could be the solution?

raven-worx

@sayan275 said in QGraphicsRectItem moves out of the scene:

What could be the solution?

The docs contain exactly what you are looking for

sayan275

@raven-worx Thanks for your quick suggestion. It's exactly what I'm looking for.
Only problem is the Image Viewer(with qGraphicsScene and qgrpahicsview) is a plugin, and the Box(QGraphicsRectItem) is another plugin. Now I have to figure out way to get

QRectF rect = scene()->sceneRect();

without adding much dependency between the 2 plugins. Hopefully signal-slots does that.

raven-worx

@sayan275
why is that a problem?
When you have the item you also have the corresponding scene?!
QGraphicsItem::scene()

sayan275

@raven-worx Thanks!! I got it after searching.
But why this event is not responding, when we update the position of the rectItem by keyPress events?

raven-worx

@sayan275 said in QGraphicsRectItem moves out of the scene:

But why this event is not responding, when we update the position of the rectItem by keyPress events?

what event? Do you mean QGraphicsItem::itemChange()?
This change notifier is called in all cases whenever the position changes - it doesn't matter how it is changed.

But it might be that you are not changing the position of the item directly?
What i am talking about is, maybe you are just updating the rect's position (top-left corner) and let the item itself always on the position (0,0)?
But long story short, show the code you are using to change the position of your rect item.