ImageTracerWidget
VTKExamples/Cxx/Widgets/ImageTracerWidget
Code
ImageTracerWidget.cxx
#include <vtkSmartPointer.h>
#include <vtkCallbackCommand.h>
#include <vtkImageActor.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkImageTracerWidget.h>
#include <vtkImageMapper3D.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkInteractorStyleImage.h>
#include <vtkProperty.h>
namespace
{
void CallbackFunction (vtkObject* caller, long unsigned int eventId,
void* clientData, void* callData );
}
int main(int, char *[])
{
vtkSmartPointer<vtkImageCanvasSource2D> imageSource =
vtkSmartPointer<vtkImageCanvasSource2D>::New();
imageSource->SetScalarTypeToUnsignedChar();
imageSource->SetNumberOfScalarComponents(3);
imageSource->SetExtent(0, 20, 0, 50, 0, 0);
imageSource->SetDrawColor(0,0,0);
imageSource->FillBox(0,20,0,50);
imageSource->SetDrawColor(255,0,0);
imageSource->FillBox(0,10,0,30);
imageSource->Update();
vtkSmartPointer<vtkImageActor> actor =
vtkSmartPointer<vtkImageActor>::New();
actor->GetMapper()->SetInputConnection(imageSource->GetOutputPort());
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(actor);
renderer->ResetCamera();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
vtkSmartPointer<vtkInteractorStyleImage> style =
vtkSmartPointer<vtkInteractorStyleImage>::New();
interactor->SetInteractorStyle(style);
vtkSmartPointer<vtkImageTracerWidget> tracer =
vtkSmartPointer<vtkImageTracerWidget>::New();
tracer->GetLineProperty()->SetLineWidth(5);
tracer->SetInteractor(interactor);
tracer->SetViewProp(actor);
renderWindow->Render();
// The observer must be added BEFORE the On() call.
vtkSmartPointer<vtkCallbackCommand> callback =
vtkSmartPointer<vtkCallbackCommand>::New();
callback->SetCallback(CallbackFunction);
tracer->AddObserver(vtkCommand::EndInteractionEvent, callback);
tracer->On();
interactor->Start();
return EXIT_SUCCESS;
}
namespace
{
void CallbackFunction (vtkObject* caller,
long unsigned int vtkNotUsed(eventId),
void* vtkNotUsed(clientData),
void* vtkNotUsed(callData) )
{
vtkImageTracerWidget* tracerWidget =
static_cast<vtkImageTracerWidget*>(caller);
vtkSmartPointer<vtkPolyData> path =
vtkSmartPointer<vtkPolyData>::New();
tracerWidget->GetPath(path);
std::cout << "There are " << path->GetNumberOfPoints() << " points in the path." << std::endl;
}
} // end anonymous namespace
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ImageTracerWidget)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageTracerWidget MACOSX_BUNDLE ImageTracerWidget.cxx)
target_link_libraries(ImageTracerWidget ${VTK_LIBRARIES})
Download and Build ImageTracerWidget
Click here to download ImageTracerWidget and its CMakeLists.txt file. Once the tarball ImageTracerWidget.tar has been downloaded and extracted,
cd ImageTracerWidget/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:
./ImageTracerWidget
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.