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ColorLookupTable

vtk-examples/Cxx/Utilities/ColorLookupTable

Description

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

Other languages

See (Java)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

ColorLookupTable.cxx

#include <vtkLookupTable.h>
#include <vtkNew.h>

int main(int, char*[])
{
  vtkNew<vtkLookupTable> lookupTable;

  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 3.12 FATAL_ERROR)

project(ColorLookupTable)

find_package(VTK COMPONENTS 
  CommonCore
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ColorLookupTable: 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(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}
)

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.