RotateActor
vtk-examples/Cxx/Visualization/RotateActor
Description¶
This example shows how to rotate an actor. It also shows how to get the current transformation of the actor so it can then be applied to the actual object if so desired.
Question
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Code¶
RotateActor.cxx
#include <vtkActor.h>
#include <vtkConeSource.h>
#include <vtkInteractorStyleTrackballActor.h>
#include <vtkMatrix4x4.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkObjectFactory.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
namespace {
// Define interaction style
class MyInteractorStyle : public vtkInteractorStyleTrackballActor
{
public:
static MyInteractorStyle* New();
vtkTypeMacro(MyInteractorStyle, vtkInteractorStyleTrackballActor);
virtual void OnLeftButtonDown()
{
std::cout << "Pressed left mouse button." << std::endl;
vtkNew<vtkMatrix4x4> m;
this->Actor->GetMatrix(m);
std::cout << "Matrix: " << endl << *m << std::endl;
// Forward events
vtkInteractorStyleTrackballActor::OnLeftButtonDown();
}
virtual void OnLeftButtonUp()
{
std::cout << "Released left mouse button." << std::endl;
vtkNew<vtkMatrix4x4> m;
this->Actor->GetMatrix(m);
std::cout << "Matrix: " << endl << *m << std::endl;
// Forward events
vtkInteractorStyleTrackballActor::OnLeftButtonUp();
}
void SetActor(vtkSmartPointer<vtkActor> actor)
{
this->Actor = actor;
}
private:
vtkSmartPointer<vtkActor> Actor;
};
vtkStandardNewMacro(MyInteractorStyle);
} // namespace
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
// Create a cone
vtkNew<vtkConeSource> coneSource;
coneSource->Update();
// Create a mapper and actor
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputConnection(coneSource->GetOutputPort());
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->RotateY(45);
actor->GetProperty()->SetColor(colors->GetColor3d("Gold").GetData());
// Create a renderer, render window, and interactor
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("RotateActor");
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkNew<MyInteractorStyle> style;
style->SetActor(actor);
renderWindowInteractor->SetInteractorStyle(style);
// Add the actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(
colors->GetColor3d("DarkSlateGray").GetData()); // white
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(RotateActor)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkCommonMath
vtkFiltersSources
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping RotateActor: ${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(RotateActor MACOSX_BUNDLE RotateActor.cxx )
target_link_libraries(RotateActor PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(RotateActor MACOSX_BUNDLE RotateActor.cxx )
target_link_libraries(RotateActor PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS RotateActor
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build RotateActor¶
Click here to download RotateActor and its CMakeLists.txt file. Once the tarball RotateActor.tar has been downloaded and extracted,
cd RotateActor/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:
./RotateActor
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.