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
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.