ColorTransferFunction

VTKExamples/Cxx/Utilities/ColorTransferFunction

Description

This example demonstrates how to map the values (0.0 to 10.0) to the colors (red to green).

Code

ColorTransferFunction.cxx

#include <vtkSmartPointer.h>
#include <vtkColorTransferFunction.h>

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

  colorTransferFunction->AddRGBPoint(0.0, 1, 0, 0);
  colorTransferFunction->AddRGBPoint(10.0, 0, 1, 0);

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

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ColorTransferFunction)

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

add_executable(ColorTransferFunction MACOSX_BUNDLE ColorTransferFunction.cxx )

target_link_libraries(ColorTransferFunction ${VTK_LIBRARIES})

Download and Build ColorTransferFunction

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

cd ColorTransferFunction/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:

./ColorTransferFunction

WINDOWS USERS

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