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Common/vtkViewport.h

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

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


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkViewport_h
#define __vtkViewport_h

#include "vtkObject.h"
#include "vtkPropCollection.h"
#include "vtkActor2DCollection.h"

class vtkWindow;
class vtkAssemblyPath;

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

  void AddProp(vtkProp *);

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

  void RemoveProp(vtkProp *);


  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) 
    {
      a[0] = this->DisplayPoint[0];
      a[1] = this->DisplayPoint[1];
      a[2] = this->DisplayPoint[2];
      a[3] = 1.0;
    };


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


  vtkSetVector4Macro(WorldPoint,float);
  vtkGetVectorMacro(WorldPoint,float,4);
  void GetWorldPoint(double *a) 
    {
      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();

  // 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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