FunctionParser

VTKExamples/Cxx/Utilities/FunctionParser

Description

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

Code

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;
}

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 )

target_link_libraries(FunctionParser ${VTK_LIBRARIES})

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

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