RotateActor
VTKExamples/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.
Code
RotateActor.cxx
#include <vtkConeSource.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleTrackballActor.h>
#include <vtkObjectFactory.h>
#include <vtkMatrix4x4.h>
// 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;
vtkSmartPointer<vtkMatrix4x4> m =
vtkSmartPointer<vtkMatrix4x4>::New();
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;
vtkSmartPointer<vtkMatrix4x4> m =
vtkSmartPointer<vtkMatrix4x4>::New();
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);
int main(int, char *[])
{
// Create a sphere
vtkSmartPointer<vtkConeSource> coneSource =
vtkSmartPointer<vtkConeSource>::New();
coneSource->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(coneSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->RotateY(45);
// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkSmartPointer<MyInteractorStyle> style =
vtkSmartPointer<MyInteractorStyle>::New();
style->SetActor(actor);
renderWindowInteractor->SetInteractorStyle( style );
// Add the actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(1,1,1); //white
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(RotateActor)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(RotateActor MACOSX_BUNDLE RotateActor.cxx)
target_link_libraries(RotateActor ${VTK_LIBRARIES})
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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.