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RubberBand2D

Repository source: RubberBand2D

Description

This example shows how to get the coordinates of the corners of the rubber band (the box that is drawn).

Question

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

Code

RubberBand2D.cxx

#include <vtkActor.h>
#include <vtkInteractorStyleRubberBand2D.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>

namespace {

class MyRubberBand : public vtkInteractorStyleRubberBand2D
{
public:
  static MyRubberBand* New();
  vtkTypeMacro(MyRubberBand, vtkInteractorStyleRubberBand2D);

  virtual void OnLeftButtonUp() override
  {
    // Forward events.
    vtkInteractorStyleRubberBand2D::OnLeftButtonUp();

    std::cout << "Start position: " << this->StartPosition[0] << " "
              << this->StartPosition[1] << std::endl;
    std::cout << "End position: " << this->EndPosition[0] << " "
              << this->EndPosition[1] << std::endl;
  }
};

vtkStandardNewMacro(MyRubberBand);

} // namespace

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

  vtkNew<vtkSphereSource> sphereSource;

  // Create a mapper and actor.
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(sphereSource->GetOutputPort());

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

  // A renderer and render window.
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("RubberBand2D");

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

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

  // Render
  renderWindow->Render();

  vtkNew<MyRubberBand> style;
  renderWindowInteractor->SetInteractorStyle(style);

  // Begin mouse interaction.
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(RubberBand2D)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  FiltersSources
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "RubberBand2D: 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(RubberBand2D MACOSX_BUNDLE RubberBand2D.cxx )
  target_link_libraries(RubberBand2D PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS RubberBand2D
  MODULES ${VTK_LIBRARIES}
)

Download and Build RubberBand2D

Click here to download RubberBand2D and its CMakeLists.txt file. Once the tarball RubberBand2D.tar has been downloaded and extracted,

cd RubberBand2D/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:

./RubberBand2D

WINDOWS USERS

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