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¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
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.