BandedPolyDataContourFilter

VTKExamples/Cxx/VisualizationAlgorithms/BandedPolyDataContourFilter


Description

Note

This original source code for this example is here.

Code

BandedPolyDataContourFilter.cxx

#include <vtkSmartPointer.h>
#include <vtkBandedPolyDataContourFilter.h>

#include <vtkCellArray.h>
#include <vtkFloatArray.h>
#include <vtkPointData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkCamera.h>
#include <vtkNamedColors.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkPoints> pts = 
    vtkSmartPointer<vtkPoints>::New();
  pts->InsertPoint( 0,  0, 0, 0);
  pts->InsertPoint( 1,  0, 1, 0);
  pts->InsertPoint( 2,  0, 2, 0);
  pts->InsertPoint( 3,  1, 0, 0);
  pts->InsertPoint( 4,  1, 1, 0);
  pts->InsertPoint( 5,  1, 2, 0);
  pts->InsertPoint( 6,  2, 0, 0);
  pts->InsertPoint( 7,  2, 2, 0);
  pts->InsertPoint( 8,  3, 0, 0);
  pts->InsertPoint( 9,  3, 1, 0);
  pts->InsertPoint( 10, 3, 2, 0 );
  pts->InsertPoint( 11, 4, 0, 0);
  pts->InsertPoint( 12, 6, 0, 0 );
  pts->InsertPoint( 13, 5, 2, 0 );
  pts->InsertPoint( 14, 7, 0, 0);
  pts->InsertPoint( 15, 9, 0, 0 );
  pts->InsertPoint( 16, 7, 2, 0 );
  pts->InsertPoint( 17, 9, 2, 0 );
  pts->InsertPoint( 18, 10, 0, 0);
  pts->InsertPoint( 19, 12, 0, 0 );
  pts->InsertPoint( 20, 10, 1, 0 );
  pts->InsertPoint( 21, 12, 1, 0 );
  pts->InsertPoint( 22, 10, 2, 0 );
  pts->InsertPoint( 23, 12, 2, 0 );
  pts->InsertPoint( 24, 10, 3, 0 );
  pts->InsertPoint( 25, 12, 3, 0);

  vtkSmartPointer<vtkCellArray> polys = 
    vtkSmartPointer<vtkCellArray>::New();
  polys->InsertNextCell( 4);
  polys->InsertCellPoint( 14);
  polys->InsertCellPoint( 15);
  polys->InsertCellPoint( 17);
  polys->InsertCellPoint( 16);
  polys->InsertNextCell( 3);
  polys->InsertCellPoint( 11);
  polys->InsertCellPoint( 12);
  polys->InsertCellPoint( 13);


  vtkSmartPointer<vtkFloatArray> scalars = 
    vtkSmartPointer<vtkFloatArray>::New();
  scalars->SetNumberOfTuples (26);
  scalars->SetTuple1( 0, 0);
  scalars->SetTuple1( 1, 50);
  scalars->SetTuple1( 2, 100);
  scalars->SetTuple1( 3, 0);
  scalars->SetTuple1( 4, 50);
  scalars->SetTuple1( 5, 100);
  scalars->SetTuple1( 6, 10);
  scalars->SetTuple1( 7, 90);
  scalars->SetTuple1( 8, 10);
  scalars->SetTuple1( 9, 50);
  scalars->SetTuple1( 10, 90);
  scalars->SetTuple1( 11, 10);
  scalars->SetTuple1( 12, 40);
  scalars->SetTuple1( 13, 100);
  scalars->SetTuple1( 14, 0);
  scalars->SetTuple1( 15, 60);
  scalars->SetTuple1( 16, 40);
  scalars->SetTuple1( 17, 100);
  scalars->SetTuple1( 18, 0);
  scalars->SetTuple1( 19, 25);
  scalars->SetTuple1( 20, 25);
  scalars->SetTuple1( 21, 50);
  scalars->SetTuple1( 22, 50);
  scalars->SetTuple1( 23, 75);
  scalars->SetTuple1( 24, 75);
  scalars->SetTuple1( 25, 100);

  vtkSmartPointer<vtkPolyData> polyData = 
    vtkSmartPointer<vtkPolyData>::New();
  polyData->SetPoints(pts);
  polyData->SetPolys(polys);
  polyData->GetPointData()->SetScalars(scalars);

  vtkSmartPointer<vtkBandedPolyDataContourFilter> bf = 
    vtkSmartPointer<vtkBandedPolyDataContourFilter>::New();
  bf->SetInputData (polyData);
  bf->GenerateValues(5, 25, 75 );

  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(bf->GetOutputPort());
  mapper->SetScalarModeToUseCellData();
  mapper->SetScalarRange (0, 4);
  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  // Create the RenderWindow, Renderer and both Actors

  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> interactor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);

  // Add the actors to the renderer, set the background and size
  renderer->AddActor(actor);

  renderWindow->SetSize (1200, 400);
  renderWindow->Render();
  renderer->GetActiveCamera()->Zoom(3);
  renderer->SetBackground(colors->GetColor3d("Melon").GetData());
  renderWindow->Render();
  interactor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(BandedPolyDataContourFilter)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(BandedPolyDataContourFilter MACOSX_BUNDLE BandedPolyDataContourFilter.cxx )

target_link_libraries(BandedPolyDataContourFilter ${VTK_LIBRARIES})

Download and Build BandedPolyDataContourFilter

Click here to download BandedPolyDataContourFilter and its CMakeLists.txt file. Once the tarball BandedPolyDataContourFilter.tar has been downloaded and extracted,

cd BandedPolyDataContourFilter/build 

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./BandedPolyDataContourFilter

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.