<div dir="ltr"><div dir="auto">Hi Abdelkhalek,<div dir="auto"><br></div><div>Where is this code located?<br></div><div dir="auto">Do you override the function QWidget::mouseReleaseEvent in a subclass of the QVTKWidget?</div><div dir="auto"><br></div><div dir="auto">I guess not, because ui->qVTK is probably an instance of QVTKWidget.<br></div><div dir="auto"><br></div><div dir="auto">MouseEvent::pos()
 returns the position relative to the widget that receives the event. 
So, if you override this function in QMainWindow (for example), then you
 get a position relative to that widget.</div><div dir="auto"><br></div><div dir="auto">You have three options:</div><div dir="auto">1. map the position relative to the QVTKWidget (Qt may have some helper functions for this)<br></div><div dir="auto">2. subclass QVTKWidget and override mouseReleaseEvent there<br></div><div>3. Handle mouse events in VTK.<br><br></div>See also <a href="https://lorensen.github.io/VTKExamples/site/Cxx/Interaction/MouseEventsObserver/" target="_blank">https://lorensen.github.io/<wbr>VTKExamples/site/Cxx/<wbr>Interaction/<wbr>MouseEventsObserver/</a> for option 3.<br></div><div dir="auto"><br></div><div>Regards,</div><div>Martijn</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-12-18 11:32 GMT+01:00 Abdelkhalek Bakkari <span dir="ltr"><<a href="mailto:bakkari.abdelkhalek@hotmail.fr" target="_blank">bakkari.abdelkhalek@hotmail.fr</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




<div dir="ltr">
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<p style="margin-top:0;margin-bottom:0">Dear All,</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I am trying to mark on the image using  a mouse release event. But the mark appears in different coordinates than which I indicate.</p>
<p style="margin-top:0;margin-bottom:0">Below is my code:</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0"></p>
<div>if (event->button() == Qt::LeftButton )</div>
<div><span style="white-space:pre-wrap"></span>{   </div>
<div><span style="white-space:pre-wrap"></span></div>
<div><span style="white-space:pre-wrap"></span></div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>// Seed points visualization</div>
<div><span style="white-space:pre-wrap"></span>vtkSmartPointer<<wbr>vtkSphereSource> sphereSource = vtkSmartPointer<<wbr>vtkSphereSource>::New();</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>double center[3] = {event->pos().x(), event->pos().y(), currentSlice};</div>
<div><span style="white-space:pre-wrap"></span>qDebug() << "center: " << center[0] << "  "<< center[1] << "  " << center[2];</div>
<div><span style="white-space:pre-wrap"></span></div>
<div><br>
</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>sphereSource->SetCenter(0.0, 0.0, 0.0);</div>
<div><span style="white-space:pre-wrap"></span>sphereSource->SetRadius(10.0);</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>sphereSource->Update();</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>vtkSmartPointer<<wbr>vtkPolyDataMapper> sphereMapper = vtkSmartPointer<<wbr>vtkPolyDataMapper>::New();</div>
<div><span style="white-space:pre-wrap"></span>sphereMapper-><wbr>SetInputConnection(<wbr>sphereSource->GetOutputPort())<wbr>;</div>
<div><span style="white-space:pre-wrap"></span>sphereMapper->Update();</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>vtkSmartPointer<vtkActor> sphereActor = vtkSmartPointer<vtkActor>::<wbr>New();</div>
<div><span style="white-space:pre-wrap"></span>sphereActor->SetMapper(<wbr>sphereMapper);</div>
<div><span style="white-space:pre-wrap"></span>sphereActor->GetProperty()-><wbr>SetColor(1.0, 0.0, 0.0);</div>
<div><span style="white-space:pre-wrap"></span>sphereActor->GetProperty()-><wbr>SetPointSize(5);</div>
<div><span style="white-space:pre-wrap"></span>sphereActor->SetPosition(<wbr>center);</div>
<div><span style="white-space:pre-wrap"></span></div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>m_renderer->DisplayToWorld();</div>
<div><span style="white-space:pre-wrap"></span>m_renderer->AddActor(<wbr>sphereActor);</div>
<div><span style="white-space:pre-wrap"></span></div>
<div><span style="white-space:pre-wrap"></span>}</div>
<div><span style="white-space:pre-wrap"></span></div>
<div><span style="white-space:pre-wrap"></span>ui->qVTK1->update();</div>
-----
<p></p>
<p style="margin-top:0;margin-bottom:0">Thank you in advance</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
</div>
</div>

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