VTK/Examples/Broken/Cxx/Widgets/BorderWorldCoords

#include <vtkSmartPointer.h>
#include <vtkWidgetCallbackMapper.h>
#include <vtkCommand.h>
#include <vtkWidgetEvent.h>
#include <vtkObjectFactory.h>
#include <vtkActor.h>
#include <vtkBorderRepresentation.h>
#include <vtkBorderWidget.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
 
#include "RegionSelectionWidget.h"
 
int main(int, char *[])
{
  // Sphere
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetRadius(4.0);
  sphereSource->Update();
 
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(sphereSource->GetOutputPort());
 
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
 
  // A renderer and render window
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
 
  // An interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
  vtkSmartPointer<RegionSelectionWidget> regionSelectionWidget =
    vtkSmartPointer<RegionSelectionWidget>::New();
  regionSelectionWidget->SetInteractor(renderWindowInteractor);
  regionSelectionWidget->CreateDefaultRepresentation();
  regionSelectionWidget->SelectableOff();
  regionSelectionWidget->Renderer = renderer;
 
  // Add the actors to the scene
  renderer->AddActor(actor);
  renderer->Render();
 
  renderWindowInteractor->Initialize();
 
  // Ideally we would do this:
   vtkBorderRepresentation* representation = static_cast<vtkBorderRepresentation*>(regionSelectionWidget->GetRepresentation());
   representation->GetPositionCoordinate()->SetCoordinateSystemToWorld();
   representation->GetPosition2Coordinate()->SetCoordinateSystemToWorld();
   representation->SetPosition(0, 0);
   representation->SetPosition2(5, 5);
 
  regionSelectionWidget->On();
 
  renderer->ResetCamera();
  renderWindow->Render();
 
  // Begin mouse interaction
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}

#ifndef REGIONSELECTIONWIDGET_H
#define REGIONSELECTIONWIDGET_H
 
#include <vtkBorderWidget.h>
 
class RegionSelectionWidget : public vtkBorderWidget
{
public:
  static RegionSelectionWidget *New();
  vtkTypeMacro(RegionSelectionWidget, vtkBorderWidget);
 
  int SubclassEndSelectAction();
 
  RegionSelectionWidget();
  vtkRenderer* Renderer;
};
 
#endif

#include "RegionSelectionWidget.h"
 
#include <vtkBorderRepresentation.h>
#include <vtkCommand.h>
#include <vtkObjectFactory.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkWidgetCallbackMapper.h>
#include <vtkWidgetEvent.h>
#include <vtkViewport.h>
#include <vtkRenderer.h>
 
vtkStandardNewMacro(RegionSelectionWidget);
 
RegionSelectionWidget::RegionSelectionWidget()
{
  this->CallbackMapper->SetCallbackMethod(vtkCommand::MiddleButtonReleaseEvent,
                                        vtkWidgetEvent::EndSelect,
                                        this, RegionSelectionWidget::EndSelectAction);
}
 
int RegionSelectionWidget::SubclassEndSelectAction()
{
 
 
  // Ideal method - coordinates must have already been set to World
//   vtkCoordinate* lowerLeft = static_cast<vtkBorderRepresentation*>(borderWidget->GetRepresentation())->GetPositionCoordinate();
//   double lowerLeftCoord[3];
//   lowerLeft->GetValue(lowerLeftCoord);
//   std::cout << "Lower left: " << lowerLeftCoord[0] << " " << lowerLeftCoord[1] << " " << lowerLeftCoord[2] << std::endl;
//   
//   vtkCoordinate* upperRight = static_cast<vtkBorderRepresentation*>(borderWidget->GetRepresentation())->GetPosition2Coordinate();
//   double upperRightCoord[3];
//   upperRight->GetValue(upperRightCoord);
//   std::cout << "Upper right: " << upperRightCoord[0] << " " << upperRightCoord[1] << " " << upperRightCoord[2] << std::endl;
 
 
  // Get the bottom left corner
//   double* lowerLeft;
//   lowerLeft = static_cast<vtkBorderRepresentation*>(borderWidget->GetRepresentation())->GetPosition();
//   std::cout << "Lower left: " << lowerLeft[0] << " " << lowerLeft[1] << std::endl;
// 
//   double* upperRight;
//   upperRight = static_cast<vtkBorderRepresentation*>(borderWidget->GetRepresentation())->GetPosition2();
//   std::cout << "Upper right: " << upperRight[0] << " " << upperRight[1] << std::endl;
 
  double* lowerLeft = static_cast<vtkBorderRepresentation*>(this->GetRepresentation())->GetPositionCoordinate()->GetComputedWorldValue (this->Renderer);
  std::cout << "Lower left: " << lowerLeft[0] << " " << lowerLeft[1] << std::endl;
 
  double* upperRight = static_cast<vtkBorderRepresentation*>(this->GetRepresentation())->GetPosition2Coordinate()->GetComputedWorldValue (this->Renderer);
  std::cout << "Upper right: " << upperRight[0] << " " << upperRight[1] << std::endl;
 
  return vtkBorderWidget::SubclassSelectAction(); // works
}