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

  Program:   Visualization Toolkit
  Module:    vtkContourRepresentation.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.

=========================================================================*/
// .NAME vtkContourRepresentation - represent the vtkContourWidget
// .SECTION Description
// The vtkContourRepresentation is a superclass for various types of
// representations for the vtkContourWidget.
//
// .SECTION Managing contour points
// The classes vtkContourRepresentationNode, vtkContourRepresentationInternals, 
// vtkContourRepresentationPoint manage the data structure used to represent 
// nodes and points on a contour. A contour may contain several nodes and 
// several more points. Nodes are usually the result of user clicked points on
// the contour. Additional points are created between nodes to generate a 
// smooth curve using some Interpolator. See the method \c SetLineInterpolator.
// \par
// The data structure stores both the world and display positions for every 
// point. (This may seem like a duplication.) The default behaviour of this 
// class is to use the WorldPosition to do all the math. Typically a point is
// added at a given display position. Its corresponding world position is 
// computed using the point placer and stored. Any query of the display 
// position of a stored point is done via the Renderer, which computes the 
// display position given a world position. 
// 
// \par 
// So why maintain the display position ? Consider drawing a contour on a 
// volume widget. You might want the contour to be located at a certain world
// position in the volume or you might want to be overlayed over the window 
// like an Actor2D. The default behaviour of this class is to provide the 
// former behaviour. 
//
// \par
// To achieve the latter behaviour override the methods that return the display 
// position (to return the set display position instead of computing it from
// the world positions) and the method \c BuildLines() to interpolate lines 
// using their display positions intead of world positions.
//
// .SECTION See Also
// vtkContourWidget


#ifndef __vtkContourRepresentation_h
#define __vtkContourRepresentation_h

#include "vtkWidgetRepresentation.h"
#include <vtkstd/vector> // STL Header; Required for vector

class vtkContourLineInterpolator;
class vtkPointPlacer;
class vtkPolyData;

//----------------------------------------------------------------------
//BTX
class vtkContourRepresentationPoint
{
public:
  double        WorldPosition[3];
  double        NormalizedDisplayPosition[2];
};

class vtkContourRepresentationNode
{
public:
  double        WorldPosition[3];
  double        WorldOrientation[9];
  double        NormalizedDisplayPosition[2];
  int           Selected;
  vtkstd::vector<vtkContourRepresentationPoint*> Points;
};

class vtkContourRepresentationInternals
{
public:
  vtkstd::vector<vtkContourRepresentationNode*> Nodes;
  void ClearNodes()
  {
    for(unsigned int i=0;i<this->Nodes.size();i++)
      {
      for (unsigned int j=0;j<this->Nodes[i]->Points.size();j++)
        {
        delete this->Nodes[i]->Points[j];
        }
      this->Nodes[i]->Points.clear();
      delete this->Nodes[i];
      }
    this->Nodes.clear(); 
  }   
};
//ETX

class VTK_WIDGETS_EXPORT vtkContourRepresentation : public vtkWidgetRepresentation
{
  //BTX  
  friend class vtkContourWidget;
  //ETX
public:
  // Description:
  // Standard VTK methods.
  vtkTypeMacro(vtkContourRepresentation,vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Add a node at a specific world position. Returns 0 if the
  // node could not be added, 1 otherwise.
  virtual int AddNodeAtWorldPosition( double x, double y, double z);
  virtual int AddNodeAtWorldPosition( double worldPos[3] );
  virtual int AddNodeAtWorldPosition( double worldPos[3],
                                      double worldOrient[9] );
  
  // Description:
  // Add a node at a specific display position. This will be
  // converted into a world position according to the current
  // constraints of the point placer. Return 0 if a point could
  // not be added, 1 otherwise.
  virtual int AddNodeAtDisplayPosition( double displayPos[2] );
  virtual int AddNodeAtDisplayPosition( int displayPos[2] );
  virtual int AddNodeAtDisplayPosition( int X, int Y );

  // Description:
  // Given a display position, activate a node. The closest
  // node within tolerance will be activated. If a node is
  // activated, 1 will be returned, otherwise 0 will be
  // returned.
  virtual int ActivateNode( double displayPos[2] );
  virtual int ActivateNode( int displayPos[2] );
  virtual int ActivateNode( int X, int Y );
  
  // Descirption:
  // Move the active node to a specified world position.
  // Will return 0 if there is no active node or the node
  // could not be moved to that position. 1 will be returned
  // on success.
  virtual int SetActiveNodeToWorldPosition( double pos[3] );
  virtual int SetActiveNodeToWorldPosition( double pos[3],
                                            double orient[9] );
  
  // Description:
  // Move the active node based on a specified display position.
  // The display position will be converted into a world
  // position. If the new position is not valid or there is
  // no active node, a 0 will be returned. Otherwise, on
  // success a 1 will be returned.
  virtual int SetActiveNodeToDisplayPosition( double pos[2] );
  virtual int SetActiveNodeToDisplayPosition( int pos[2] );
  virtual int SetActiveNodeToDisplayPosition( int X, int Y );
  
  // Description:
  // Set/Get whether the active or nth node is selected. 
  virtual int ToggleActiveNodeSelected();
  virtual int GetActiveNodeSelected();
  virtual int GetNthNodeSelected(int);
  virtual int SetNthNodeSelected(int);

  // Description:
  // Get the world position of the active node. Will return
  // 0 if there is no active node, or 1 otherwise.
  virtual int GetActiveNodeWorldPosition( double pos[3] );
  
  // Description:
  // Get the world orientation of the active node. Will return
  // 0 if there is no active node, or 1 otherwise.  
  virtual int GetActiveNodeWorldOrientation( double orient[9] );
  
  // Description:
  // Get the display position of the active node. Will return
  // 0 if there is no active node, or 1 otherwise.
  virtual int GetActiveNodeDisplayPosition( double pos[2] );

  // Description:
  // Get the number of nodes.
  virtual int GetNumberOfNodes();
  
  // Description:
  // Get the nth node's display position. Will return
  // 1 on success, or 0 if there are not at least 
  // (n+1) nodes (0 based counting).
  virtual int GetNthNodeDisplayPosition( int n, double pos[2] );
  
  // Description:
  // Get the nth node's world position. Will return
  // 1 on success, or 0 if there are not at least 
  // (n+1) nodes (0 based counting).
  virtual int GetNthNodeWorldPosition( int n, double pos[3] );
  
  // Description:
  // Get the nth node's world orientation. Will return
  // 1 on success, or 0 if there are not at least 
  // (n+1) nodes (0 based counting).
  virtual int GetNthNodeWorldOrientation( int n, double orient[9] );
  
  // Description:
  // Set the nth node's display position. Display position
  // will be converted into world position according to the
  // constraints of the point placer. Will return
  // 1 on success, or 0 if there are not at least 
  // (n+1) nodes (0 based counting) or the world position
  // is not valid.
  virtual int SetNthNodeDisplayPosition( int n, int X, int Y );
  virtual int SetNthNodeDisplayPosition( int n, int pos[2] );
  virtual int SetNthNodeDisplayPosition( int n, double pos[2] );
  
  // Description:
  // Set the nth node's world position. Will return
  // 1 on success, or 0 if there are not at least 
  // (n+1) nodes (0 based counting) or the world
  // position is not valid according to the point
  // placer.
  virtual int SetNthNodeWorldPosition( int n, double pos[3] );
  virtual int SetNthNodeWorldPosition( int n, double pos[3],
                                       double orient[9] );
  
  // Description:
  // Get the nth node's slope. Will return
  // 1 on success, or 0 if there are not at least 
  // (n+1) nodes (0 based counting).
  virtual int  GetNthNodeSlope( int idx, double slope[3] );
  
  // Descirption:
  // For a given node n, get the number of intermediate
  // points between this node and the node at
  // (n+1). If n is the last node and the loop is
  // closed, this is the number of intermediate points
  // between node n and node 0. 0 is returned if n is
  // out of range.
  virtual int GetNumberOfIntermediatePoints( int n );
  
  // Description:
  // Get the world position of the intermediate point at
  // index idx between nodes n and (n+1) (or n and 0 if
  // n is the last node and the loop is closed). Returns
  // 1 on success or 0 if n or idx are out of range.
  virtual int GetIntermediatePointWorldPosition( int n, 
                                                 int idx, double point[3] );
  
  // Description:
  // Add an intermediate point between node n and n+1
  // (or n and 0 if n is the last node and the loop is closed).
  // Returns 1 on success or 0 if n is out of range.
  virtual int AddIntermediatePointWorldPosition( int n, 
                                                 double point[3] );

  // Description:
  // Delete the last node. Returns 1 on success or 0 if 
  // there were not any nodes.
  virtual int DeleteLastNode();
  
  // Description:
  // Delete the active node. Returns 1 on success or 0 if
  // the active node did not indicate a valid node.
  virtual int DeleteActiveNode();
  
  // Description:
  // Delete the nth node. Return 1 on success or 0 if n
  // is out of range.
  virtual int DeleteNthNode( int n );
  
  // Description:
  // Delete all nodes. 
  virtual void ClearAllNodes();
  
  // Description:
  // Given a specific X, Y pixel location, add a new node 
  // on the contour at this location. 
  virtual int AddNodeOnContour( int X, int Y );
  
  // Description:
  // The tolerance to use when calculations are performed in 
  // display coordinates
  vtkSetClampMacro(PixelTolerance,int,1,100);
  vtkGetMacro(PixelTolerance,int);

  // Description:
  // The tolerance to use when calculations are performed in
  // world coordinates
  vtkSetClampMacro(WorldTolerance, double, 0.0, VTK_DOUBLE_MAX);
  vtkGetMacro(WorldTolerance, double);

//BTX -- used to communicate about the state of the representation
  enum {
    Outside=0,
    Nearby
  };
  
  enum {
    Inactive = 0,
    Translate,
    Shift,
    Scale
  };
//ETX

  // Description:
  // Set / get the current operation. The widget is either
  // inactive, or it is being translated.
  vtkGetMacro( CurrentOperation, int );
  vtkSetClampMacro( CurrentOperation, int, 
                    vtkContourRepresentation::Inactive,
                    vtkContourRepresentation::Scale );
  void SetCurrentOperationToInactive()
    { this->SetCurrentOperation( vtkContourRepresentation::Inactive ); }
  void SetCurrentOperationToTranslate()
    { this->SetCurrentOperation( vtkContourRepresentation::Translate ); }
  void SetCurrentOperationToShift()
    {this->SetCurrentOperation( vtkContourRepresentation::Shift ); }
  void SetCurrentOperationToScale()
    {this->SetCurrentOperation( vtkContourRepresentation::Scale ); }

  // Descirption:
  // Set / get the Point Placer. The point placer is
  // responsible for converting display coordinates into
  // world coordinates according to some constraints, and
  // for validating world positions.
  void SetPointPlacer( vtkPointPlacer * );
  vtkGetObjectMacro( PointPlacer, vtkPointPlacer );
  
  // Description:
  // Set / Get the Line Interpolator. The line interpolator
  // is responsible for generating the line segments connecting
  // nodes.
  void SetLineInterpolator( vtkContourLineInterpolator *);
  vtkGetObjectMacro( LineInterpolator, vtkContourLineInterpolator );
  
  // Description:
  // These are methods that satisfy vtkWidgetRepresentation's API.
  virtual void BuildRepresentation()=0;
  virtual int ComputeInteractionState(int X, int Y, int modified=0)=0;
  virtual void StartWidgetInteraction(double e[2])=0;
  virtual void WidgetInteraction(double e[2])=0;

  // Description:
  // Methods required by vtkProp superclass.
  virtual void ReleaseGraphicsResources(vtkWindow *w)=0;
  virtual int RenderOverlay(vtkViewport *viewport)=0;
  virtual int RenderOpaqueGeometry(vtkViewport *viewport)=0;
  virtual int RenderTranslucentPolygonalGeometry(vtkViewport *viewport)=0;
  virtual int HasTranslucentPolygonalGeometry()=0;
  
  // Description:
  // Set / Get the ClosedLoop value. This ivar indicates whether the contour
  // forms a closed loop. 
  void SetClosedLoop( int val );
  vtkGetMacro( ClosedLoop, int );
  vtkBooleanMacro( ClosedLoop, int );
  
  // Description:
  // A flag to indicate whether to show the Selected nodes
  // Default is to set it to false.
  virtual void SetShowSelectedNodes(int);
  vtkGetMacro( ShowSelectedNodes, int );
  vtkBooleanMacro( ShowSelectedNodes, int );

  // Description:
  // Get the points in this contour as a vtkPolyData. 
  //BTX
  virtual vtkPolyData* GetContourRepresentationAsPolyData() = 0;
  //ETX

  // Description:
  // Get the nodes and not the intermediate points in this 
  // contour as a vtkPolyData.
  void GetNodePolyData( vtkPolyData* poly );
 

protected:
  vtkContourRepresentation();
  ~vtkContourRepresentation();
  
  // Selection tolerance for the handles
  int    PixelTolerance;
  double WorldTolerance;

  vtkPointPlacer             *PointPlacer;
  vtkContourLineInterpolator *LineInterpolator;
  
  int ActiveNode;
  
  int CurrentOperation;
  int ClosedLoop;

  // A flag to indicate whether to show the Selected nodes
  int                   ShowSelectedNodes;
  
  vtkContourRepresentationInternals *Internal;

  void AddNodeAtPositionInternal( double worldPos[3],
                                  double worldOrient[9], int displayPos[2] );
  void AddNodeAtPositionInternal( double worldPos[3],
                                  double worldOrient[9], double displayPos[2] );
  void SetNthNodeWorldPositionInternal( int n, double worldPos[3],
                                        double worldOrient[9] );

  // Description:
  // Given a world position and orientation, this computes the display position
  // using the renderer of this class. 
  void GetRendererComputedDisplayPositionFromWorldPosition( double worldPos[3],
                                    double worldOrient[9], int displayPos[2] );
  void GetRendererComputedDisplayPositionFromWorldPosition( double worldPos[3],
                                    double worldOrient[9], double displayPos[2] );
  
  void UpdateLines( int index );
  void UpdateLine( int idx1, int idx2 );

  virtual int FindClosestPointOnContour( int X, int Y, 
                                 double worldPos[3],
                                 int *idx );
  
  virtual void BuildLines()=0;

  // This method is called when something changes in the point
  // placer. It will cause all points to
  // be updates, and all lines to be regenerated.
  // Should be extended to detect changes in the line interpolator
  // too.
  virtual int  UpdateContour();
  vtkTimeStamp ContourBuildTime;
  
  void ComputeMidpoint( double p1[3], double p2[3], double mid[3] )
    {
      mid[0] = (p1[0] + p2[0])/2;
      mid[1] = (p1[1] + p2[1])/2;
      mid[2] = (p1[2] + p2[2])/2;
    }

  // Description:
  // Build a contour representation from externally supplied PolyData. This
  // is very useful when you use an external program to compute a set of
  // contour nodes, let's say based on image features. Subsequently, you want
  // to build and display a contour that runs through those points.
  // This method is protected and accessible only from 
  // vtkContourWidget::Initialize( vtkPolyData * )
  virtual void Initialize( vtkPolyData * );

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

#endif

