CaptionActor2D
VTKExamples/Cxx/Visualization/CaptionActor2D
Code
CaptionActor2D.cxx
#include <vtkAbstractPicker.h>
#include <vtkActor.h>
#include <vtkActor2D.h>
#include <vtkCaptionActor2D.h>
#include <vtkCoordinate.h>
#include <vtkFollower.h>
#include <vtkImageActor.h>
#include <vtkImageMapper3D.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkCoordinate.h>
#include <vtkTransform.h>
#include <vtkTransformPolyDataFilter.h>
#include <vtkPolyDataMapper2D.h>
#include <vtkInteractorStyleImage.h>
#include <vtkMath.h>
#include <vtkObjectFactory.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkProperty2D.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRendererCollection.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSphereSource.h>
#include <vtkSmartPointer.h>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>
#include <vtkVectorText.h>
#include <sstream>
class MyStyle : public vtkInteractorStyleImage
{
public:
static MyStyle* New();
vtkTypeMacro(MyStyle, vtkInteractorStyleImage);
std::vector<vtkActor2D*> Numbers;
void OnLeftButtonDown()
{
//std::cout << "Picking pixel: " << this->Interactor->GetEventPosition()[0] << " " << this->Interactor->GetEventPosition()[1] << std::endl;
this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],
this->Interactor->GetEventPosition()[1],
0, // always zero.
//this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
this->CurrentRenderer );
double picked[3];
this->Interactor->GetPicker()->GetPickPosition(picked);
//std::cout << "Picked point with coordinate: " << picked[0] << " " << picked[1] << " " << picked[2] << std::endl;
this->AddNumber(picked);
// Forward events
vtkInteractorStyleImage::OnLeftButtonDown();
//this->Interactor->GetRenderWindow()->Render();
this->Interactor->Render();
}
void AddNumber(double p[3])
{
std::cout << "Adding marker at " << p[0] << " " << p[1] ;//<< std::endl;
// normally, with an image you would do
// double* s = image->GetSpacing();
// double* o = image->GetOrigin();
// p[0] = static_cast<int>( (p[0] - o[0]) / s[0] + 0.5 );
p[0] = static_cast<int>( p[0] + 0.5 );
p[1] = static_cast<int>( p[1] + 0.5 );
std::cout << " -> " << p[0] << " " << p[1] << std::endl;
// Convert the current number to a string
std::stringstream ss;
ss << Numbers.size();
std::cout << "Adding number: " << ss.str() << std::endl;
// Create an actor for the text
vtkSmartPointer<vtkCaptionActor2D> captionActor = vtkSmartPointer<vtkCaptionActor2D>::New();
captionActor->SetCaption( ss.str().c_str() );
captionActor->SetAttachmentPoint(p);
captionActor->BorderOff();
captionActor->GetCaptionTextProperty()->BoldOff();
captionActor->GetCaptionTextProperty()->ItalicOff();
captionActor->GetCaptionTextProperty()->ShadowOff();
captionActor->ThreeDimensionalLeaderOff();
this->CurrentRenderer->AddViewProp( captionActor );
this->Numbers.push_back(captionActor);
}
};
vtkStandardNewMacro(MyStyle);
int main (int, char *[])
{
// Create a blank, black image
vtkSmartPointer<vtkImageCanvasSource2D> drawing = vtkSmartPointer<vtkImageCanvasSource2D>::New();
drawing->SetScalarTypeToUnsignedChar();
drawing->SetNumberOfScalarComponents(3);
drawing->SetExtent(0, 20, 0, 50, 0, 0);
drawing->FillBox(0,20,0,50);
// Draw a red circle of radius 5 centered at (9,10)
drawing->SetDrawColor(255, 0, 0, 0);
drawing->DrawCircle(9, 10, 5);
drawing->Update();
vtkSmartPointer<vtkImageActor> actor = vtkSmartPointer<vtkImageActor>::New();
actor->GetMapper()->SetInputConnection(drawing->GetOutputPort());
actor->InterpolateOff();
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->AddActor(actor);
renderer->SetBackground(1,1,1); // Background color white
renderer->GradientBackgroundOn();
renderer->SetBackground2(0,0,1); // Background 2 color blue
renderWindow->Render();
vtkSmartPointer<MyStyle> style = vtkSmartPointer<MyStyle>::New();
renderWindowInteractor->SetInteractorStyle( style );
style->SetDefaultRenderer( renderer );
style->SetCurrentRenderer( renderer );
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(CaptionActor2D)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(CaptionActor2D MACOSX_BUNDLE CaptionActor2D.cxx)
target_link_libraries(CaptionActor2D ${VTK_LIBRARIES})
Download and Build CaptionActor2D
Click here to download CaptionActor2D and its CMakeLists.txt file. Once the tarball CaptionActor2D.tar has been downloaded and extracted,
cd CaptionActor2D/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:
./CaptionActor2D
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.