DeletePoint

VTKExamples/Cxx/PolyData/DeletePoint

Question

Code¶

DeletePoint.cxx

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>

void OutputPoints(vtkSmartPointer<vtkPoints> points);
void ReallyDeletePoint(vtkSmartPointer<vtkPoints> points, vtkIdType id);

int main(int, char *[])
{
// Create a set of points
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint ( 1.0, 0.0, 0.0 );
points->InsertNextPoint ( 0.0, 1.0, 0.0 );
points->InsertNextPoint ( 0.0, 0.0, 1.0 );

std::cout << "Number of points: " << points->GetNumberOfPoints() << std::endl;
OutputPoints(points);

ReallyDeletePoint(points, 1);

std::cout << "Number of points: " << points->GetNumberOfPoints() << std::endl;
OutputPoints(points);

return EXIT_SUCCESS;
}

void OutputPoints(vtkSmartPointer<vtkPoints> points)
{
for(vtkIdType i = 0; i < points->GetNumberOfPoints(); i++)
{
double p[3];
points->GetPoint(i,p);
cout << p[0] << " " << p[1] << " " << p[2] << endl;
}
}

void ReallyDeletePoint(vtkSmartPointer<vtkPoints> points, vtkIdType id)
{
vtkSmartPointer<vtkPoints> newPoints =
vtkSmartPointer<vtkPoints>::New();

for(vtkIdType i = 0; i < points->GetNumberOfPoints(); i++)
{
if(i != id)
{
double p[3];
points->GetPoint(i,p);
newPoints->InsertNextPoint(p);
}
}

points->ShallowCopy(newPoints);
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(DeletePoint)

find_package(VTK COMPONENTS
vtkCommonCore
vtkCommonDataModel QUIET)
if (NOT VTK_FOUND)
message("Skipping DeletePoint: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION:${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE}) add_executable(DeletePoint MACOSX_BUNDLE DeletePoint.cxx ) target_link_libraries(DeletePoint PRIVATE${VTK_LIBRARIES})
else ()
# include all components
target_link_libraries(DeletePoint PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS DeletePoint MODULES${VTK_LIBRARIES}
)
endif ()

cd DeletePoint/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:

./DeletePoint

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.