EllipticalButton

VTKEx/Cxx/Interaction/EllipticalButton

Description

This example creates a 3D button using vtkEllipsoidalButton. Interaction is done by assigning the button to a vtkProp3DButtonRepresentation. Then a callback for a vtkButtonWidget controls the color of the button and the displayed geometry. Click on the button to see the color of both the button and geometry change.

Warning

There is a bug in vtkEllipticalButtonSource. If CircumferentialResolution is odd, improper geometry is created.

Warning

Values close to 1.0 for RadialRatio can cause shading artifacts at the corners of the button.

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

EllipticalButton.cxx

#include <vtkEllipticalButtonSource.h>
#include <vtkSmartPointer.h>

#include <vtkSuperquadricSource.h>

#include <vtkImageReader2Factory.h>
#include <vtkImageReader2.h>
#include <vtkImageData.h>

#include <vtkTexture.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

#include <vtkProp3DButtonRepresentation.h>
#include <vtkButtonWidget.h>
#include <vtkCoordinate.h>
#include <vtkCommand.h>

#include <vtkNamedColors.h>

// Callback for the interaction
namespace
{
class vtkButtonCallback : public vtkCommand
{
public:
  static vtkButtonCallback *New()
    { return new vtkButtonCallback; }
  virtual void Execute(vtkObject *caller, unsigned long, void*)
  {
      vtkButtonWidget *buttonWidget =
        reinterpret_cast<vtkButtonWidget*>(caller);
      vtkProp3DButtonRepresentation *rep =
        reinterpret_cast<vtkProp3DButtonRepresentation *>
        (buttonWidget->GetRepresentation());
      int state = rep->GetState();
      this->Actor->GetProperty()->SetColor(reinterpret_cast<vtkActor *>(rep->GetButtonProp(state))->GetProperty()->GetColor());
      std::cout << "State: " << state << "\n";
  }
  vtkButtonCallback():Actor(0) {}
  vtkActor *Actor;
};
}

static vtkSmartPointer<vtkActor> CreateButtonActor(const char *textureFile);

int main (int argc, char *argv[])
{
  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " imageFilename" << std::endl;
    return EXIT_FAILURE;
  }

  vtkSmartPointer<vtkNamedColors> color =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkSuperquadricSource> source =
    vtkSmartPointer<vtkSuperquadricSource>::New();
  source->SetPhiResolution(64);
  source->SetThetaResolution(64);
  source->SetThetaRoundness(1.5);
  source->SetThickness(1.5);
  source->SetSize(2);
  source->Update();

  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(source->GetOutputPort());

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderer->AddActor(actor);
  renderer->SetBackground(color->GetColor3d("Burlywood").GetData());

  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(200, 200);
  renderWindow->AddRenderer(renderer);

  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Create the widget and its representation
  vtkSmartPointer<vtkActor> buttonActor1 = CreateButtonActor(argv[1]);
  buttonActor1->GetProperty()->SetColor(color->GetColor3d("Tomato").GetData());
  vtkSmartPointer<vtkActor> buttonActor2 = CreateButtonActor(argv[1]);
  buttonActor2->GetProperty()->SetColor(color->GetColor3d("Banana").GetData());

  vtkSmartPointer<vtkProp3DButtonRepresentation> buttonRepresentation =
    vtkSmartPointer<vtkProp3DButtonRepresentation>::New();
  buttonRepresentation->SetNumberOfStates(2);
  buttonRepresentation->SetButtonProp(0, buttonActor1);
  buttonRepresentation->SetButtonProp(1, buttonActor2);
  buttonRepresentation->FollowCameraOn();

  vtkSmartPointer<vtkButtonCallback> callback =
    vtkSmartPointer<vtkButtonCallback>::New();
  callback->Actor = actor;
  actor->GetProperty()->SetColor(reinterpret_cast<vtkActor *>(buttonRepresentation->GetButtonProp(0))->GetProperty()->GetColor());

  renderWindowInteractor->Initialize();

  vtkSmartPointer<vtkButtonWidget> buttonWidget =
    vtkSmartPointer<vtkButtonWidget>::New();
  buttonWidget->SetInteractor(renderWindowInteractor);
  buttonWidget->SetRepresentation(buttonRepresentation);
  buttonWidget->AddObserver(vtkCommand::StateChangedEvent,callback);
  buttonWidget->SetEnabled(1);

  renderer->ResetCamera();
  renderer->Render();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}
vtkSmartPointer<vtkActor> CreateButtonActor(const char *textureFile)
{
  vtkSmartPointer<vtkImageReader2Factory> readerFactory =
    vtkSmartPointer<vtkImageReader2Factory>::New();
  vtkSmartPointer<vtkImageReader2> imageReader;
  imageReader.TakeReference(
    readerFactory->CreateImageReader2(textureFile));
  imageReader->SetFileName(textureFile);
  imageReader->Update();

  // Aspect ratio of image
  int dims[3];
  imageReader->GetOutput()->GetDimensions(dims);
  double aspect = static_cast<double>(dims[0])/ static_cast<double>(dims[1]);

  vtkSmartPointer<vtkTexture> texture =
    vtkSmartPointer<vtkTexture>::New();
  texture->SetInputConnection(imageReader->GetOutputPort());

  vtkSmartPointer<vtkEllipticalButtonSource> ellipticalButtonSource
    = vtkSmartPointer<vtkEllipticalButtonSource>::New();
  ellipticalButtonSource->SetCircumferentialResolution(50);
  ellipticalButtonSource->SetShoulderResolution(10);
  ellipticalButtonSource->SetTextureResolution(10);
  ellipticalButtonSource->SetRadialRatio(1.05);
  ellipticalButtonSource->SetShoulderTextureCoordinate(0.0, 0.0);
  ellipticalButtonSource->SetTextureDimensions(dims[0], dims[1]);
  ellipticalButtonSource->SetTextureStyleToProportional();
  ellipticalButtonSource->TwoSidedOn();
  ellipticalButtonSource->SetWidth(aspect);
  ellipticalButtonSource->SetHeight(1.0);
  ellipticalButtonSource->SetDepth(.15);
  ellipticalButtonSource->SetCenter(2, 2, 0);

  ellipticalButtonSource->SetOutputPointsPrecision(vtkAlgorithm::SINGLE_PRECISION);

  vtkSmartPointer<vtkPolyDataMapper> buttonMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  buttonMapper->SetInputConnection(ellipticalButtonSource->GetOutputPort());

  vtkSmartPointer<vtkActor> buttonActor =
    vtkSmartPointer<vtkActor>::New();
  buttonActor->SetMapper(buttonMapper);
  buttonActor->SetTexture(texture);

  return buttonActor;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(EllipticalButton)

find_package(VTK COMPONENTS 
  vtkvtkCommonColor
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersSources
  vtkvtkIOImage
  vtkvtkInteractionStyle
  vtkvtkInteractionWidgets
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping EllipticalButton: ${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(EllipticalButton MACOSX_BUNDLE EllipticalButton.cxx )
  target_link_libraries(EllipticalButton PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(EllipticalButton MACOSX_BUNDLE EllipticalButton.cxx )
  target_link_libraries(EllipticalButton PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS EllipticalButton
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build EllipticalButton

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

cd EllipticalButton/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:

./EllipticalButton

WINDOWS USERS

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