ReadTextFile
VTKExamples/Cxx/IO/ReadTextFile
Description¶
This example takes a plain text file of coordinates and reads them into a vtkPoints, which is then put into a vtkPolyData and displayed on the screen using a vtkVertexGlyphFilter.
An example file may look like: 1 2 3 4 5 6 7 8 9
Note
for a simpler way to read such a file, see SimplePointsReader.
Code¶
ReadTextFile.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkPoints.h> #include <vtkVertexGlyphFilter.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <sstream> int main(int argc, char* argv[]) { // Verify input arguments if ( argc != 2 ) { std::cout << "Usage: " << argv[0] << " Filename(.xyz)" << std::endl; return EXIT_FAILURE; } // Get all data from the file std::string filename = argv[1]; std::ifstream filestream(filename.c_str()); std::string line; vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); while(std::getline(filestream, line)) { double x, y, z; std::stringstream linestream; linestream << line; linestream >> x >> y >> z; points->InsertNextPoint(x, y, z); } filestream.close(); vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New(); polyData->SetPoints(points); vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter = vtkSmartPointer<vtkVertexGlyphFilter>::New(); #if VTK_MAJOR_VERSION <= 5 glyphFilter->SetInputConnection(polyData->GetProducerPort()); #else glyphFilter->SetInputData(polyData); #endif glyphFilter->Update(); // Visualize vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(glyphFilter->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(actor); renderer->SetBackground(.3, .6, .3); // Background color green vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ReadTextFile) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ReadTextFile MACOSX_BUNDLE ReadTextFile.cxx) target_link_libraries(ReadTextFile ${VTK_LIBRARIES})
Download and Build ReadTextFile¶
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 ReadTextFile and its CMakeLists.txt file. Once the tarball ReadTextFile.tar has been downloaded and extracted,
cd ReadTextFile/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:
./ReadTextFile
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.