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<p class="MsoNormal"><span lang="EN-US">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am working on a Qt (4.7.4) project and need to plot data in 2D and 3D coordinate systems. I basically got 2D plots working but am stuck plotting data in 3D.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here's what I tried: I'm using the following piece of code that I took from one of vtk's tests ( Charts / Core / Testing / Cxx / TestSurfacePlot.cxx ). The only thing I added is the QVTKWidget that I use in my GUI and
its interactor (see code below). <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Now, this produces a plot but I can neither interact with it not does it look 3D. I would like to do some basic stuff like zoom, pan, or rotate about a pivot. A few questions that come to my mind about this are:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Is it correct to assign the QVTKWidget interactor to the view in the third line from the bottom?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- In the test, a vtkChartXYZ is added to the vtkContextView. According to the documentation, the vtkContextView is used to display a 2D scene but here is used with a 3D chart (XYZ). How does this fit together?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your help!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Dirk<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Sample code below<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">QVTKWidget vtkWidget;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">vtkNew<vtkChartXYZ> chart;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">vtkNew<vtkPlotSurface> plot;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">vtkNew<vtkContextView> view;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">view->GetRenderWindow()->SetSize(400, 300);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">vtkWidget.SetRenderWindow(view->GetRenderWindow());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">view->GetScene()->AddItem(chart.GetPointer());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">chart->SetGeometry(vtkRectf(75.0, 20.0, 250, 260));<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">// Create a surface<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">vtkNew<vtkTable> table;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">float numPoints = 70;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">float inc = 9.424778 / (numPoints - 1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">for (float i = 0; i < numPoints; ++i)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">{<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> vtkNew<vtkFloatArray> arr;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> table->AddColumn(arr.GetPointer());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">table->SetNumberOfRows(numPoints);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">for (float i = 0; i < numPoints; ++i)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">{<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> float x = i * inc;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> for (float j = 0; j < numPoints; ++j)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> float y = j * inc;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> table->SetValue(i, j, sin(sqrt(x*x + y*y)));<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">// Set up the surface plot we wish to visualize and add it to the chart.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">plot->SetXRange(0, 9.424778);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">plot->SetYRange(0, 9.424778);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">plot->SetInputData(table.GetPointer());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">chart->AddPlot(plot.GetPointer());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">view->GetRenderWindow()->SetMultiSamples(0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">view->SetInteractor(vtkWidget.GetInteractor());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">view->GetInteractor()->Initialize();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">view->GetRenderWindow()->Render();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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