IterateOverLines
Repository source: IterateOverLines
Question
If you have a question about this example, please use the VTK Discourse Forum
Code¶
IterateOverLines.cxx
#include <vtkCellArray.h>
#include <vtkLine.h>
#include <vtkNew.h>
#include <vtkPoints.h>
#include <vtkPolyData.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
vtkNew<vtkPoints> points;
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
vtkNew<vtkCellArray> lines;
// Create four lines
for (unsigned int i = 0; i < 4; i++)
{
vtkNew<vtkLine> line;
line->GetPointIds()->SetId(0, i);
line->GetPointIds()->SetId(1, i + 1);
lines->InsertNextCell(line);
}
// Create a polydata to store everything in
vtkNew<vtkPolyData> linesPolyData;
// 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();
vtkNew<vtkIdList> idList;
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 3.12 FATAL_ERROR)
project(IterateOverLines)
find_package(VTK COMPONENTS
CommonCore
CommonDataModel
)
if (NOT VTK_FOUND)
message(FATAL_ERROR "IterateOverLines: Unable to find the VTK build folder.")
endif()
# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(IterateOverLines MACOSX_BUNDLE IterateOverLines.cxx )
target_link_libraries(IterateOverLines PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS IterateOverLines
MODULES ${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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.