ColorLookupTable

VTKExamples/Cxx/Utilities/ColorLookupTable

Description

This example shows how to create a table of colors that map from a continuous range of values.

Code

ColorLookupTable.cxx

#include <vtkSmartPointer.h>
#include <vtkLookupTable.h>

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

  lookupTable->SetTableRange(0.0, 10.0);
  // If you don't want to use the whole color range, you can use
  // SetValueRange, SetHueRange, and SetSaturationRange
  lookupTable->Build();

  double color[3];
  lookupTable->GetColor(1.0, color);
  std::cout << color[0] << " " << color[1] << " " << color[2] << std::endl;

  lookupTable->GetColor(5.0, color);
  std::cout << color[0] << " " << color[1] << " " << color[2] << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ColorLookupTable)

find_package(VTK COMPONENTS 
  vtkCommonCore QUIET)
if (NOT VTK_FOUND)
  message("Skipping ColorLookupTable: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(ColorLookupTable MACOSX_BUNDLE ColorLookupTable.cxx )
  target_link_libraries(ColorLookupTable PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ColorLookupTable MACOSX_BUNDLE ColorLookupTable.cxx )
  target_link_libraries(ColorLookupTable PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ColorLookupTable
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ColorLookupTable

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

cd ColorLookupTable/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:

./ColorLookupTable

WINDOWS USERS

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