[Qt-interest] adding a QGraphicsPixmapItem

[pmqt71]

Hi Alex,
I'm already doing that and I just discovered the problem:

there was a call to setSceneRect in the drawBackground method of the
QGraphicsScene subclass.

A kind of repainting loop generated the animation.
thanks a lot.
pm

2010/10/22 Malyushytsky, Alex <alex at wai.com>

> All I can say without seen full compliable example is that this seems does
> not happen to me
> and the code you displayed could make it possible.
> Animation does not start magically.
>
> Make a small compilable example which displays the problem.
> Basically create view, scene, show them, create an item not overriding any
> of those.
> Still have a problem? - Post the code.
> No problem? - find what is difference between that code and you
> application.
>
> Alex
>
>
>
> From: pmqt71 [mailto:pmqt71 at gmail.com]
> Sent: Friday, October 22, 2010 2:10 AM
> To: Malyushytsky, Alex
> Cc: qt-interest at trolltech.com
>  Subject: Re: [Qt-interest] adding a QGraphicsPixmapItem
>
>
> No, the problem is not in the animate method.
>
> the only statement:
> QGraphicsPixmapItem* item = gs->addPixmap(pixmap);
> removing the animate stuff,  makes the pixmap appear with a short
> animation.
>
> I'll attach the source code on a next post...
>
> thanks
>
> pm
>
>
>
>
> 2010/10/22 Malyushytsky, Alex <alex at wai.com>
>
> You re-implemented  advance().
> That what caused the item move.
> Make it do nothing and it will not animate.
>
> Alex
>
>
> From: pmqt71 [mailto:pmqt71 at gmail.com]
> Sent: Thursday, October 21, 2010 3:43 PM
> To: Malyushytsky, Alex; qt-interest at trolltech.com
> Subject: Re: [Qt-interest] adding a QGraphicsPixmapItem
>
> I'm using Qt 4.6.2 on xp, VC++ Express 2008.
>
> I partially solved overriding the paint method and drawing the pixmap using
> the painter:
> painter->drawPixmap(0, 0, 20, 20, m_pixmap);
>
> But I still have the strange problem calling the scene's update method
> after moving the pixmap:
>
> class MyQGraphicsPixmapItem: public QGraphicsPixmapItem
> {
> ...
> void advance(int step)
> {
>     if(!step) return;
>     moveBy(1, 0);
>
>     //ok
>     this->scene()->update();
>
>     //nok, the pixmap starts from the scene's center and moves to its
> position.
>     //this->scene()->update( 0, 0, 20, 20);
>
> }
> };
>
> I'm now searching the documentation to improve the update part, but I'd
> like to know what causes the strange animation.
>
> pm
>
>
> 2010/10/21 Malyushytsky, Alex <alex at wai.com>
> What version of Qt you are using?
> That sounds weird, when I use QGraphicsPixmapItem it just displayed at the
> location it supposed to be .
>
> Alex
>
> From: qt-interest-bounces at trolltech.com [mailto:
> qt-interest-bounces at trolltech.com] On Behalf Of pmqt71
> Sent: Thursday, October 21, 2010 6:17 AM
> To: qt-interest at trolltech.com
> Subject: [Qt-interest] adding a QGraphicsPixmapItem
>
> Hi all,
> adding a QGraphicsPixmapItem on a QGraphicsScene, I see a short animation
> showing the pixmap moving from the scene's center to the top-right corner.
> How to disable this effect? I just want the pixmap in the top-right corner
> of the scene.
>
> the statement is:
> QGraphicsPixmapItem* item = gs->addPixmap(pixmap);
> thanks
> pm
>
>
>
>
>
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