VTK/Examples/Cxx/Utilities/FunctionParser

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This example shows how to substitute values and evaluate a string such as "a+b".

FunctionParser.cxx

#include <vtkSmartPointer.h>
#include <vtkFunctionParser.h>


int main(int, char *[])
{
  vtkSmartPointer<vtkFunctionParser> functionParser = 
      vtkSmartPointer<vtkFunctionParser>::New();
  functionParser->SetFunction("a+b");
  
  functionParser->SetScalarVariableValue( "a", 2);
  functionParser->SetScalarVariableValue( "b", 3);
    
  double result = functionParser->GetScalarResult();
  
  std::cout << "result: " << result << std::endl;
  
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(FunctionParser)

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

add_executable(FunctionParser MACOSX_BUNDLE FunctionParser.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(FunctionParser ${VTK_LIBRARIES})
else()
  target_link_libraries(FunctionParser vtkHybrid vtkWidgets)
endif()

Download and Build FunctionParser

Click here to download FunctionParser. and its CMakeLists.txt file.

Once the tarball FunctionParser.tar has been downloaded and extracted,

cd FunctionParser/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:

./FunctionParser

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