[英]vtk 6.x, Qt: 3D (line, surface, scatter) plotting
我正在做一個Qt(4.7.4)項目,需要在2D和3D坐標系中繪制數據。 我一直在研究vtk 6.1,因為它總體上看起來非常強大,並且以后還需要可視化圖像數據。 我基本上可以使用2D圖,但是無法在3D模式下繪制數據。
這是我嘗試的方法:我正在使用從vtk的一項測試(圖表/核心/測試/ Cxx / TestSurfacePlot.cxx)中獲得的以下代碼。 我添加的唯一一件事是在GUI及其交互器中使用的QVTKWidget:
QVTKWidget vtkWidget;
vtkNew<vtkChartXYZ> chart;
vtkNew<vtkPlotSurface> plot;
vtkNew<vtkContextView> view;
view->GetRenderWindow()->SetSize(400, 300);
vtkWidget.SetRenderWindow(view->GetRenderWindow());
view->GetScene()->AddItem(chart.GetPointer());
chart->SetGeometry(vtkRectf(75.0, 20.0, 250, 260));
// Create a surface
vtkNew<vtkTable> table;
float numPoints = 70;
float inc = 9.424778 / (numPoints - 1);
for (float i = 0; i < numPoints; ++i)
{
vtkNew<vtkFloatArray> arr;
table->AddColumn(arr.GetPointer());
}
table->SetNumberOfRows(numPoints);
for (float i = 0; i < numPoints; ++i)
{
float x = i * inc;
for (float j = 0; j < numPoints; ++j)
{
float y = j * inc;
table->SetValue(i, j, sin(sqrt(x*x + y*y)));
}
}
// Set up the surface plot we wish to visualize and add it to the chart.
plot->SetXRange(0, 9.424778);
plot->SetYRange(0, 9.424778);
plot->SetInputData(table.GetPointer());
chart->AddPlot(plot.GetPointer());
view->GetRenderWindow()->SetMultiSamples(0);
view->SetInteractor(vtkWidget.GetInteractor());
view->GetInteractor()->Initialize();
view->GetRenderWindow()->Render();
現在,這將產生一個繪圖,但是我既無法與之交互,也不會看起來像3D。 我想做一些基本的事情,例如縮放,平移或圍繞樞軸旋轉。 我想到的幾個問題是:
以下代碼對我有用。 無需顯式分配一個交互器,因為QVTKWidget已經解決了該交互器。
QVTKWidget vtkWidget;
vtkSmartPointer<vtkContextView> view = vtkSmartPointer<vtkContextView>::New();
vtkSmartPointer<vtkChartXYZ> chart = vtkSmartPointer<vtkChartXYZ>::New();
// Create a surface
vtkSmartPointer<vtkTable> table = vtkSmartPointer<vtkTable>::New();
float numPoints = 70;
float inc = 9.424778 / (numPoints - 1);
for (float i = 0; i < numPoints; ++i)
{
vtkSmartPointer<vtkFloatArray> arr = vtkSmartPointer<vtkFloatArray>::New();
table->AddColumn(arr.GetPointer());
}
table->SetNumberOfRows(numPoints);
for (float i = 0; i < numPoints; ++i)
{
float x = i * inc;
for (float j = 0; j < numPoints; ++j)
{
float y = j * inc;
table->SetValue(i, j, sin(sqrt(x*x + y*y)));
}
}
view->SetRenderWindow(vtkWidget.GetRenderWindow());
chart->SetGeometry(vtkRectf(200.0, 200.0, 300, 300));
view->GetScene()->AddItem(chart.GetPointer());
vtkSmartPointer<vtkPlotSurface> plot = vtkSmartPointer<vtkPlotSurface>::New();
// Set up the surface plot we wish to visualize and add it to the chart.
plot->SetXRange(0, 10.0);
plot->SetYRange(0, 10.0);
plot->SetInputData(table.GetPointer());
chart->AddPlot(plot.GetPointer());
view->GetRenderWindow()->SetMultiSamples(0);
view->GetRenderWindow()->Render();
您可能需要閱讀vtkRenderViewBase中的詳細說明
QVTKWidget *widget = new QVTKWidget;
vtkContextView *view = vtkContextView::New();
view->SetInteractor(widget->GetInteractor());
widget->SetRenderWindow(view->GetRenderWindow());
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