ColoredPoints

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See (Java)

Question

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Code¶

ColoredPoints.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkUnsignedCharArray.h>
#include <vtkVertexGlyphFilter.h>

#include <vtkNamedColors.h>

// For compatibility with new VTK generic data arrays
#ifdef vtkGenericDataArray_h
#define InsertNextTupleValue InsertNextTypedTuple
#endif

int main(int, char*[])
{
  vtkNew<vtkPoints> points;
  points->InsertNextPoint(0.0, 0.0, 0.0);
  points->InsertNextPoint(1.0, 0.0, 0.0);
  points->InsertNextPoint(0.0, 1.0, 0.0);

  vtkNew<vtkPolyData> pointsPolydata;

  pointsPolydata->SetPoints(points);

  vtkNew<vtkVertexGlyphFilter> vertexFilter;
  vertexFilter->SetInputData(pointsPolydata);
  vertexFilter->Update();

  vtkNew<vtkPolyData> polydata;
  polydata->ShallowCopy(vertexFilter->GetOutput());

  // Setup colors
  vtkNew<vtkNamedColors> namedColors;

  vtkNew<vtkUnsignedCharArray> colors;
  colors->SetNumberOfComponents(3);
  colors->SetName("Colors");
  colors->InsertNextTupleValue(namedColors->GetColor3ub("Tomato").GetData());
  colors->InsertNextTupleValue(namedColors->GetColor3ub("Mint").GetData());
  colors->InsertNextTupleValue(namedColors->GetColor3ub("Peacock").GetData());

  polydata->GetPointData()->SetScalars(colors);

  // Visualization
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputData(polydata);

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetPointSize(10);

  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("ColoredPoints");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(namedColors->GetColor3d("Burlywood").GetData());
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(ColoredPoints)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  FiltersGeneral
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ColoredPoints: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(ColoredPoints MACOSX_BUNDLE ColoredPoints.cxx )
  target_link_libraries(ColoredPoints PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS ColoredPoints
  MODULES ${VTK_LIBRARIES}
)

Download and Build ColoredPoints¶

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

cd ColoredPoints/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:

./ColoredPoints

WINDOWS USERS

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