Skip to content

PointSize

vtk-examples/Cxx/Visualization/PointSize

Description

This example demonstrates how to change the size of an actor's points.

Other languages

See (Python)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

PointSize.cxx

#include <vtkActor.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPointSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  // Create points.
  vtkNew<vtkPointSource> src;
  src->SetCenter(0, 0, 0);
  src->SetNumberOfPoints(10);
  src->SetRadius(5);

  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(src->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetPointSize(5);
  actor->GetProperty()->SetColor(colors->GetColor3d("Yellow").GetData());

  // A renderer and render window.
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("PointSize");

  // An interactor
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Add the actors to the scene.
  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("RoyalBLue").GetData());

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(PointSize)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "PointSize: 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(PointSize MACOSX_BUNDLE PointSize.cxx )
  target_link_libraries(PointSize PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS PointSize
  MODULES ${VTK_LIBRARIES}
)

Download and Build PointSize

Click here to download PointSize and its CMakeLists.txt file. Once the tarball PointSize.tar has been downloaded and extracted,

cd PointSize/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:

./PointSize

WINDOWS USERS

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