---

Common/vtkViewport.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkViewport.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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 __vtkViewport_h
#define __vtkViewport_h

#include "vtkObject.h"

class vtkActor2DCollection;
class vtkAssemblyPath;
class vtkProp;
class vtkPropCollection;
class vtkWindow;

class VTK_COMMON_EXPORT vtkViewport : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkViewport,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  void AddProp(vtkProp *);

  vtkPropCollection *GetProps() {return this->Props;};

  void RemoveProp(vtkProp *);

  void RemoveAllProps(void);


  void AddActor2D(vtkProp* p) {this->AddProp(p);};
  void RemoveActor2D(vtkProp* p);
  vtkActor2DCollection *GetActors2D();


  vtkSetVector3Macro(Background,float);
  vtkGetVectorMacro(Background,float,3);


  vtkSetVector2Macro(Aspect,float);
  vtkGetVectorMacro(Aspect,float,2);
  void ComputeAspect();
  

  vtkSetVector2Macro(PixelAspect,float);
  vtkGetVectorMacro(PixelAspect,float,2);


  vtkSetVector4Macro(Viewport,float);
  vtkGetVectorMacro(Viewport,float,4);


  vtkSetVector3Macro(DisplayPoint,float);
  vtkGetVectorMacro(DisplayPoint,float,3);
  void GetDisplayPoint(double a[3]) 
    {
      a[0] = this->DisplayPoint[0];
      a[1] = this->DisplayPoint[1];
      a[2] = this->DisplayPoint[2];
    };


  vtkSetVector3Macro(ViewPoint,float);
  vtkGetVectorMacro(ViewPoint,float,3);


  vtkSetVector4Macro(WorldPoint,float);
  vtkGetVectorMacro(WorldPoint,float,4);
  void GetWorldPoint(double a[4]) 
    {
      a[0] = this->WorldPoint[0];
      a[1] = this->WorldPoint[1];
      a[2] = this->WorldPoint[2];
      a[3] = this->WorldPoint[3];
    };
   
  virtual float *GetCenter();

  virtual int IsInViewport(int x,int y); 

  virtual vtkWindow *GetVTKWindow() = 0;

  void SetStartRenderMethod(void (*f)(void *), void *arg);

  void SetEndRenderMethod(void (*f)(void *), void *arg);

  void SetStartRenderMethodArgDelete(void (*f)(void *));

  void SetEndRenderMethodArgDelete(void (*f)(void *));

  virtual void DisplayToView(); // these get modified in subclasses

  virtual void ViewToDisplay(); // to handle stereo rendering

  virtual void WorldToView();

  virtual void ViewToWorld();

  void DisplayToWorld() {this->DisplayToView(); this->ViewToWorld();};

  void WorldToDisplay() {this->WorldToView(); this->ViewToDisplay();};


  virtual void LocalDisplayToDisplay(float &x, float &y);
  virtual void DisplayToNormalizedDisplay(float &u, float &v);
  virtual void NormalizedDisplayToViewport(float &x, float &y);
  virtual void ViewportToNormalizedViewport(float &u, float &v);
  virtual void NormalizedViewportToView(float &x, float &y, float &z);
  virtual void ViewToWorld(float &, float &, float &) {};
  virtual void DisplayToLocalDisplay(float &x, float &y);
  virtual void NormalizedDisplayToDisplay(float &u, float &v);
  virtual void ViewportToNormalizedDisplay(float &x, float &y);
  virtual void NormalizedViewportToViewport(float &u, float &v);
  virtual void ViewToNormalizedViewport(float &x, float &y, float &z);
  virtual void WorldToView(float &, float &, float &) {};


  int *GetSize();
  int *GetOrigin();
  void GetTiledSize(int *width, int *height);
  
  // The following methods describe the public pick interface for picking
  // Props in a viewport.

  virtual vtkAssemblyPath* PickProp(float selectionX, float selectionY) = 0;


  vtkAssemblyPath* PickPropFrom(float selectionX, float selectionY, 
                                vtkPropCollection*);
  

  vtkGetMacro(PickX, float);
  vtkGetMacro(PickY, float);
  vtkGetMacro(IsPicking, int);

  virtual float GetPickedZ() = 0;
  
protected:
  // Create a vtkViewport with a black background, a white ambient light, 
  // two-sided lighting turned on, a viewport of (0,0,1,1), and back face 
  // culling turned off.
  vtkViewport();
  ~vtkViewport();

  //BTX
  // Picking functions to be implemented by sub-classes
  // Perform the main picking loop
  virtual void DevicePickRender() = 0;
  // Enter a pick mode
  virtual void StartPick(unsigned int pickFromSize) = 0;
  // Set the pick id to the next id before drawing an object
  virtual void UpdatePickId() = 0;
  // Exit Pick mode
  virtual void DonePick() = 0; 
  // Return the id of the picked object, only valid after a call to DonePick
  virtual unsigned int GetPickedId() = 0;
  //ETX

  // Ivars for picking
  // Store a picked Prop (contained in an assembly path)
  vtkAssemblyPath* PickedProp;
  vtkPropCollection* PickFromProps;
  // Boolean flag to determine if picking is enabled for this render
  int IsPicking;
  unsigned int CurrentPickId;
  float PickX;
  float PickY;
  // End Ivars for picking
  
  vtkPropCollection *Props;
  vtkActor2DCollection *Actors2D;
  vtkWindow *VTKWindow;
  float Background[3];  
  float Viewport[4];
  float Aspect[2];
  float PixelAspect[2];
  float Center[2];

  unsigned long StartTag;
  unsigned long EndTag;

  int Size[2];
  int Origin[2];
  float DisplayPoint[3];
  float ViewPoint[3];
  float WorldPoint[4];

private:
  vtkViewport(const vtkViewport&);  // Not implemented.
  void operator=(const vtkViewport&);  // Not implemented.
};



#endif

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