[vtkusers] Point Selection on vtkChartXY

[Giuseppe Marco Randazzo]

ok thanks.... it works... but get me the selection the second time that 
i select other points....

For example i select two point first time and the output is:

Selected Points


secont time i select 4 points and the output is:

Selected Points
Number of tuples : 2
18
272


now i reselect the same two point of the first time ad the output will be:
Selected Points
Number of tuples : 4
20
10
341
203

that correspond to the previous selection.

It's strange, maybe there is a pointer to update after selection and 
before getting selection?

here is the code:

void ScatterPlot2D::getPointSelected()
{
   qDebug() << "Selected Points";
   vtkIdTypeArray *idarray = 
vtkIdTypeArray::SafeDownCast(chart->GetPlot(0)->GetSelection());
   if(idarray){
     qDebug() << "Number of tuples :" << idarray->GetNumberOfTuples();
     for(vtkIdType i = 0; i < idarray->GetNumberOfTuples(); i++){
       qDebug() << idarray->GetValue(i);
     }
   }
}



Thank

Marco


On 09/04/2012 04:54 PM, Darshan Pai wrote:
> If yu have access to the vtkChartXY object in the getPointSelected 
> function()
> you can retrieve the ID's using the following command
>
> vtkIdTypeArray *idarray = chartxy->GetPlot(0)->GetSelection();
>
> you can iterate through the Id's and retrieve the corresponding points .
>
> Regards
>
>
> On Mon, Sep 3, 2012 at 7:11 PM, Giuseppe Marco Randazzo 
> <gmrandazzo at gmail.com <mailto:gmrandazzo at gmail.com>> wrote:
>
>     Points are selected, but i'm not able to get these selected
>     points... i'm not able to accesso to selection.
>     vtkChartXY i know that is not a Qt Widget. I put a vtkchartXY into
>     a qvtkwidget.
>
>     My connection works, but i'm my slot getPointSelected() is empty
>
>     getPointSelected()
>     {
>        // how to get point selected?
>     }
>
>     regards and thanks a lot :)
>
>
>
>
>     On 09/04/2012 12:41 AM, Darshan Pai wrote:
>>     What exactly is your error? Does it highlight or not?
>>     vtkChartXY is not a Qt Widget , so I am not sure how were you
>>     able to use vtkQtSlotConnect .
>>
>>     Regards
>>
>>
>>     On Mon, Sep 3, 2012 at 11:56 AM, Giuseppe Marco Randazzo
>>     <gmrandazzo at gmail.com <mailto:gmrandazzo at gmail.com>> wrote:
>>
>>         Hello,
>>
>>         i've some questions about Rubberband selection on vtkchartxy.
>>         I'm not able to use this features.
>>
>>         I'm using vtk inside a qt widget, so i implemented a slot and
>>         after connectet this through:
>>
>>           Connections = vtkEventQtSlotConnect::New();
>>         Connections->Connect(ui.qvtkWidget->GetRenderWindow()->GetInteractor(),
>>         vtkCommand::RightButtonReleaseEvent,
>>                                 this,
>>         SLOT(getPointSelected()),0, 1.0);
>>
>>
>>         When i select some points on plot with the rubberband
>>         selector, the points are highlited and the slot
>>         getPointSelected() work.
>>         My questions are:
>>
>>         Is possible get the points highlighted? and how?
>>         is there a better solution than mine?
>>
>>         Thanks
>>
>>         Giuseppe Marco Randazzo
>>
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