[Qt-interest] Box Pick Zoom

[Sujan Dasmahapatra]

Dear Friends
Can I draw on the view by reimplementing  paintEvent() method. ??

On Sat, Aug 15, 2009 at 2:38 PM, Sujan Dasmahapatra <
sujan.dasmahapatra at gmail.com> wrote:

> Dear Friends Can we use QwtPlotZoomer for QGraphicsView...??
>
>
> On Sat, Aug 15, 2009 at 1:53 PM, Sujan Dasmahapatra <
> sujan.dasmahapatra at gmail.com> wrote:
>
>> I want to paint on the QGraphicsView do I need to reimplement paintEvent()
>> ??
>>
>>
>> On Fri, Aug 14, 2009 at 8:57 PM, Christopher Rasch-Olsen Raa <
>> christopher at technophile.info> wrote:
>>
>>> Some code would help us spot what you're doing wrong.
>>>
>>> --
>>> Christopher
>>>
>>>  Fredag 14 august 2009 16:17:27 skrev Sujan Dasmahapatra :
>>>  > Dear Friends
>>> > I am fed up with this implementing box pick zoom.
>>> > implementing paintEvent() mehtod is changin the whole software looks.
>>> > I set the scene in the view with scene background as black.
>>> > Now I am implementing paint() method for graphicsItem display on the
>>> > view.These all were going fine.
>>> >
>>> >
>>> > Now I want to implement box pick zoom ,i.e user will press the left
>>> mouse
>>> > and release then there should be a rectangle selected and any items
>>> coming
>>> > in that portion should be selected.
>>> >
>>> > But I wanted to draw a rectangle in the paintEvent() method but if I
>>> > implement that method then my view is getting white it's not what I
>>> set.
>>> >
>>> > Please giveme some suugestion where should I draw the rectangle. !!!
>>> > Thanks
>>> >
>>> > On Thu, Aug 13, 2009 at 5:53 PM, Sujan Dasmahapatra <
>>> >
>>> > sujan.dasmahapatra at gmail.com> wrote:
>>> > > It seems the whole work is manual right ? I need to define the box
>>> and
>>> > > get the portion of my items.
>>> > > One question is that I may not have a full graphicsItem but a some
>>> > > portion of the item may be picked so in that case is it possible to
>>> > > operate over that portion ?
>>> > >
>>> > >   On Thu, Aug 13, 2009 at 5:35 PM, Thomas Dähling <
>>> > >
>>> > > t.daehling at googlemail.com> wrote:
>>> > >> OK, so what is the specific problem? Of course there won't be a
>>> rubber
>>> > >> band appearing by issuing that simple call you did, because that is
>>> > >> just deciding how the View should treat selected Items (i.e. select
>>> > >> all items that contained or intersected by the graphicsitem or it's
>>> > >> bounding rect). If you want to start showing a rubber band you might
>>> > >> have to reimplement the view and provide a specialized paint routine
>>> > >> that, when 'zoom in' is toggled, draws a rect around the selected
>>> > >> items.
>>> > >>
>>> > >> 2009/8/13 Sujan Dasmahapatra <sujan.dasmahapatra at gmail.com>:
>>> > >> > Box Pick Zoom is rubber band selection option.
>>> > >> > Mean User'll pick some portion on the view using  left mouse
>>> (Rubber
>>> > >>
>>> > >> band
>>> > >>
>>> > >> > selection )and that portion will be zoomed.
>>> > >> >
>>> > >> > On Thu, Aug 13, 2009 at 4:56 PM, Thomas Dähling <
>>> > >>
>>> > >> t.daehling at googlemail.com>
>>> > >>
>>> > >> > wrote:
>>> > >> >> In all honesty, I cannot imagine what 'box pick zoom' is supposed
>>> to
>>> > >> >> be, and google did not help me figuring this out either. Maybe if
>>> you
>>> > >> >> could elaborate further upon what this is exactly supposed to do
>>> > >> >> there'll be more people able to help you out with this.
>>> > >> >>
>>> > >> >> 2009/8/13 Sujan Dasmahapatra <sujan.dasmahapatra at gmail.com>:
>>> > >> >> > Dear Friends
>>> > >> >> >
>>> > >> >> > I have a QGraphicsView, QGraphicsScene and a bunch of
>>> > >> >> > QGraphicsItem.
>>> > >> >> >
>>> > >> >> > all the  items are in the scene and displayed in view. I want
>>> to
>>> > >>
>>> > >> provide
>>> > >>
>>> > >> >> > box
>>> > >> >> > pick zoom in and zoom out to the items or to the view.
>>> > >> >> >
>>> > >> >> > so  in the slot when user clicks for zoom in I am enabling
>>> > >> >> > rubberband selection mode.
>>> > >> >> > //something like this.
>>> > >> >> > MainWindow::ZoomIn()
>>> > >> >> > {
>>> > >> >> >    view->setRubberBandSelectionMode (Qt::ContainsItemShape);
>>> > >> >> >
>>> > >> >> > }
>>> > >> >> >
>>> > >> >> >
>>> > >> >> > //////////////////////////////////////////////
>>> > >> >> >
>>> > >> >> > but when I click on zoom in  no rubber band is appearing.Can
>>> anyone
>>> > >> >> > suggest
>>> > >> >> > me how could I achieve box pick zoom for my view and items in
>>> the
>>> > >>
>>> > >> view.
>>> > >>
>>> > >> >> > ??
>>> > >> >> >
>>> > >> >> > --
>>> > >> >> > Thanks & Regards
>>> > >> >> > S. Dasmahapatra
>>> > >> >> > B.E. (Aeronautics-Aerodynamics)
>>> > >> >> > Bangalore, India
>>> > >> >> > Ph:91-9900839788
>>> > >> >> > Office:91-80-66470248
>>> > >> >> > mail id : sujan.dasmahapatra at gmail.com
>>> > >> >> >
>>> > >> >> > _______________________________________________
>>> > >> >> > Qt-interest mailing list
>>> > >> >> > Qt-interest at trolltech.com
>>> > >> >> > http://lists.trolltech.com/mailman/listinfo/qt-interest
>>> > >> >
>>> > >> > --
>>> > >> > Thanks & Regards
>>> > >> > S. Dasmahapatra
>>> > >> > B.E. (Aeronautics-Aerodynamics)
>>> > >> > Bangalore, India
>>> > >> > Ph:91-9900839788
>>> > >> > Office:91-80-66470248
>>> > >> > mail id : sujan.dasmahapatra at gmail.com
>>> > >> >
>>> > >> > _______________________________________________
>>> > >> > Qt-interest mailing list
>>> > >> > Qt-interest at trolltech.com
>>> > >> > http://lists.trolltech.com/mailman/listinfo/qt-interest
>>> > >
>>> > > --
>>> > >  Thanks & Regards
>>> > > S. Dasmahapatra
>>> > > B.E. (Aeronautics-Aerodynamics)
>>> > > Bangalore, India
>>> > > Ph:91-9900839788
>>> > > Office:91-80-66470248
>>> > > mail id : sujan.dasmahapatra at gmail.com
>>>
>>>
>>> _______________________________________________
>>> Qt-interest mailing list
>>> Qt-interest at trolltech.com
>>> http://lists.trolltech.com/mailman/listinfo/qt-interest
>>>
>>
>>
>>
>> --
>>  Thanks & Regards
>> S. Dasmahapatra
>> B.E. (Aeronautics-Aerodynamics)
>> Bangalore, India
>> Ph:91-9900839788
>> Office:91-80-66470248
>> mail id : sujan.dasmahapatra at gmail.com
>>
>
>
>
> --
> Thanks & Regards
> S. Dasmahapatra
> B.E. (Aeronautics-Aerodynamics)
> Bangalore, India
> Ph:91-9900839788
> Office:91-80-66470248
> mail id : sujan.dasmahapatra at gmail.com
>



-- 
Thanks & Regards
S. Dasmahapatra
B.E. (Aeronautics-Aerodynamics)
Bangalore, India
Ph:91-9900839788
Office:91-80-66470248
mail id : sujan.dasmahapatra at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20090815/256a6e74/attachment.html