vtkScenePicker.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkScenePicker.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkScenePicker_h
#define vtkScenePicker_h

#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkObject.h"

class vtkRenderer;
class vtkProp;
class vtkHardwareSelector;
class vtkRenderWindowInteractor;
class vtkScenePickerSelectionRenderCommand;

class VTKRENDERINGCORE_EXPORT vtkScenePicker : public vtkObject
{

  friend class vtkRenderer;
  friend class vtkScenePickerSelectionRenderCommand;

public:
  static vtkScenePicker* New();
  vtkTypeMacro(vtkScenePicker, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  virtual void SetRenderer(vtkRenderer*);
  vtkGetObjectMacro(Renderer, vtkRenderer);

  vtkIdType GetCellId(int displayPos[2]);

  vtkIdType GetVertexId(int displayPos[2]);

  vtkProp* GetViewProp(int displayPos[2]);


  vtkSetMacro(EnableVertexPicking, vtkTypeBool);
  vtkGetMacro(EnableVertexPicking, vtkTypeBool);
  vtkBooleanMacro(EnableVertexPicking, vtkTypeBool);

protected:
  vtkScenePicker();
  ~vtkScenePicker() override;

  // Pick render entire viewport
  // Automatically invoked from vtkRenderer at the end of a still render.
  void PickRender();

  // Pick render a region of the renderwindow
  void PickRender(int x0, int y0, int x1, int y1);

  // Internal update method retrieves info from the Selector
  void Update(int displayPos[2]);

  // The RenderWindowInteractor must be set, so that avoid scene picks (which
  // involve extra renders) during interaction. This is done by observing the
  // RenderWindowInteractor for start and end interaction events.
  void SetInteractor(vtkRenderWindowInteractor *);

  vtkTypeBool EnableVertexPicking;
  vtkHardwareSelector* Selector;
  vtkRenderer* Renderer;
  vtkRenderWindowInteractor* Interactor;
  vtkIdType VertId;
  vtkIdType CellId;
  vtkProp* Prop;
  bool NeedToUpdate;
  int LastQueriedDisplayPos[2];
  vtkScenePickerSelectionRenderCommand* SelectionRenderCommand;

  vtkTimeStamp PickRenderTime;
private:
  vtkScenePicker(const vtkScenePicker&) = delete;
  void operator=(const vtkScenePicker&) = delete;
};

#endif