[vtkusers] vtkChartXY picking

[Richard Brown]

I just advanced from where I was and I know have:

void pointSelected(vtkObject* obj, unsigned long,void*, void*)
{
    std::cout << "\nPoint selected.\n";

    // Print info of selected point
}

int main()
{
    chart->SetActionToButton(vtkChartXY::SELECT, vtkContextMouseEvent::LEFT_BUTTON);

    vtkSmartPointer<vtkCallbackCommand> keypressCallback = vtkSmartPointer<vtkCallbackCommand>::New();
    keypressCallback->SetCallback ( pointSelected );
    chart->AddObserver(vtkContextMouseEvent::LEFT_BUTTON, keypressCallback);
}

And this works as expected; every time I left-click on a point, I cout “Point selected”.

My initial question is still stands: how do I get information on the selected point?

When plotting my points, they were part of a table. Could I get the table in question (there are multiple plots, so multiple tables), and then the index of the data point within the table? 

Regards,
Richard

> On 22 Apr 2016, at 16:05, Richard Brown <richard.j.brown at live.co.uk> wrote:
> 
> Hi Jeff,
> 
> So if I want my left button to select the point underneath it (I think the right button by default creates a box and selects points within that box but then does nothing with them…) and then, for example, print the information pertaining to that point, how would I go about that?
> 
> SetButtonToAction(vtkChartXY::SELECT, vtkContextMouseEvent::LEFT_MOUSE);
> 
> Do I then set up an observer for vtkChartXY::SELECT?
> 
> And from there, when I’m in the callback function, how do I get the information of the selected point?
> 
> Thanks in advance,
> Richard
> 
> 
>> On 18 Apr 2016, at 13:54, Jeff Baumes <jeff.baumes at kitware.com <mailto:jeff.baumes at kitware.com>> wrote:
>> 
>> I think you want SetActionToButton() on vtkChart to change mouse bindings. You should be able to listen for a selection event once that is set up.
>> 
>> http://www.vtk.org/doc/nightly/html/classvtkChart.html#ac4162187f5f3ad97f0163a079e06f13d <http://www.vtk.org/doc/nightly/html/classvtkChart.html#ac4162187f5f3ad97f0163a079e06f13d>
>> On Fri, Apr 15, 2016 at 9:13 AM mbcx9rb9 <richard.j.brown at live.co.uk <mailto:richard.j.brown at live.co.uk>> wrote:
>> Hi all,
>> 
>> I'd like to create a custom interactor for vtkChartXY (inherited from
>> vtkContextInteractorStyle), but I can't figure out how to select single
>> points with the left click of the mouse. Once I manage to that, I would need
>> to return the index of the selected point.
>> 
>> This seems very straightforward to me, but I haven't seen any concrete
>> examples.
>> 
>> Any pointers would be greatly appreciated.
>> 
>> Regards,
>> Richard
>> 
>> 
>> 
>> 
>> 
>> --
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