IterateOverLines
VTKExamples/Cxx/PolyData/IterateOverLines
Description¶
(If anyone can explain why the commented section doesn't work the same as the uncommented section, or fix it, that would be great.)
Code¶
IterateOverLines.cxx
#include <vtkSmartPointer.h> #include <vtkLine.h> #include <vtkCellArray.h> #include <vtkPolyData.h> #include <vtkPoints.h> int main(int, char *[]) { double origin[3] = {0.0, 0.0, 0.0}; double p0[3] = {1.0, 0.0, 0.0}; double p1[3] = {0.0, 1.0, 0.0}; double p2[3] = {0.0, 1.0, 2.0}; double p3[3] = {1.0, 2.0, 3.0}; // Create a vtkPoints object and store the points in it vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(origin); points->InsertNextPoint(p0); points->InsertNextPoint(p1); points->InsertNextPoint(p2); points->InsertNextPoint(p3); // Create a cell array to store the lines in and add the lines to it vtkSmartPointer<vtkCellArray> lines = vtkSmartPointer<vtkCellArray>::New(); //Create four lines for(unsigned int i = 0; i < 4; i++) { vtkSmartPointer<vtkLine> line = vtkSmartPointer<vtkLine>::New(); line->GetPointIds()->SetId(0,i); line->GetPointIds()->SetId(1,i+1); lines->InsertNextCell(line); } // Create a polydata to store everything in vtkSmartPointer<vtkPolyData> linesPolyData = vtkSmartPointer<vtkPolyData>::New(); // Add the points to the dataset linesPolyData->SetPoints(points); // Add the lines to the dataset linesPolyData->SetLines(lines); std::cout << "There are " << linesPolyData->GetNumberOfLines() << " lines." << std::endl; linesPolyData->GetLines()->InitTraversal(); vtkSmartPointer<vtkIdList> idList = vtkSmartPointer<vtkIdList>::New(); while(linesPolyData->GetLines()->GetNextCell(idList)) { std::cout << "Line has " << idList->GetNumberOfIds() << " points." << std::endl; for(vtkIdType pointId = 0; pointId < idList->GetNumberOfIds(); pointId++) { std::cout << idList->GetId(pointId) << " "; } std::cout << std::endl; } return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(IterateOverLines) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(IterateOverLines MACOSX_BUNDLE IterateOverLines.cxx) target_link_libraries(IterateOverLines ${VTK_LIBRARIES})
Download and Build IterateOverLines¶
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 Some tarballs may be missing or out-of-date.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 IterateOverLines and its CMakeLists.txt file. Once the tarball IterateOverLines.tar has been downloaded and extracted,
cd IterateOverLines/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:
./IterateOverLines
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.