[Qt-interest] setSceneRect vanished my items from GraphicsView :(

[Usman Ajmal]

 Thanks Enrico i got the problem solved. I was actually changing location of
rectangle in the RectMap::paint() function. That was creating the main
problem. Now everything is just appearing fine because now i am changing
setPos to display my new rectangles.  :)

But now i have problem with making my items clickable or hightlighted when
hovered. I showed my code here:
http://www.qtcentre.org/forum/f-newbie-4/t-mouse-hovering-or-press-event-not-working-22438.html

Anyways thanks for the nice example though. It made things clear.

--
Usman

  On Mon, Jul 13, 2009 at 8:11 PM, Enrico Ros <enrico.qt at email.it> wrote:

> On Sunday 12 July 2009 13:20:11 Usman Ajmal wrote:
> > Thanks Enrico but you may see that some of your rectangles are not
> showing
> > up fully, meaning you can't see some of the rectangles' bottom and right
> > parts. Also, the left and top part of your GraphicsView are white. Isn't
> it
> > abnormal?
>
> It's all ok. It's just becase I reproduced the same conditions you were
> writing about in your previous post.
>
> The scene rectangle had the top-left corner on -360, -256 and the rects had
> the left and top coordinates non-negative, so it's normal you see white on
> the
> top and left areas.
>
> > I think there is some thing wrong with my bounding rectangle but i
> couldn't
> > understand the relation between bounding rectangle and setSceneRectangle
> > even by viewing the Mice Collider examply of Trolltech.
>
> You have to read carefully and understand the GraphicsView framework
> documentation, like
> http://doc.qtsoftware.com/4.6-snapshot/graphicsview.html .
>
> 1. Take a white sheet of paper, that is your scene. Write on the top-left
> and
> bottom-right corners 2 coordinates, like (0,0) and (400, 800) [note, they
> can
> be even negative numbers]. This is the space you can "view" and every point
> inside has a coordinate in the given range.
>
> 2. Take smaller chunks of paper and choose the anchor. For QGraphicsRect
> items
> the anchor is on top left. Usually you'll find the anchor on top-left or
> center of the item.
>
> 3. You can move the item (the 'anchor point') and the item will be visible
>  if
> you're inside the sheet of paper.
>
> The best approach here is to have a fixed bounding rectangle and to move
> ('setPos'), scale, rotate or 'transform' the item in some way. There are
> even
> helpers for moving items with the mouse (see QGraphicsItem::setFlags) to
> save
> you work.
>
> Keep trying, it will be rewarding ;-)
>
> Enrico Ros
>
> --
>
>
>
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