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

  Program:   Visualization Toolkit
  Module:    vtkLineRepresentation.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 vtkLineRepresentation - a class defining the representation for a vtkLineWidget2
// .SECTION Description
// This class is a concrete representation for the vtkLineWidget2. It
// represents a straight line with three handles: one at the beginning and
// ending of the line, and one used to translate the line. Through
// interaction with the widget, the line representation can be arbitrarily
// placed in the 3D space.
//
// To use this representation, you normally specify the position of the two
// end points (either in world or display coordinates). The PlaceWidget()
// method is also used to intially position the representation.

// .SECTION Caveats
// This class, and vtkLineWidget2, are next generation VTK
// widgets. An earlier version of this functionality was defined in the
// class vtkLineWidget.

// .SECTION See Also
// vtkLineWidget2 vtkLineWidget


#ifndef __vtkLineRepresentation_h
#define __vtkLineRepresentation_h

#include "vtkWidgetRepresentation.h"

class vtkActor;
class vtkPolyDataMapper;
class vtkLineSource;
class vtkSphereSource;
class vtkProperty;
class vtkPolyData;
class vtkPolyDataAlgorithm;
class vtkPointHandleRepresentation3D;
class vtkBox;


class VTK_WIDGETS_EXPORT vtkLineRepresentation : public vtkWidgetRepresentation
{
public:
  // Description:
  // Instantiate the class.
  static vtkLineRepresentation *New();

  // Description:
  // Standard methods for the class.
  vtkTypeRevisionMacro(vtkLineRepresentation,vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Methods to Set/Get the coordinates of the two points defining
  // this representation. Note that methods are available for both
  // display and world coordinates.
  void GetPoint1WorldPosition(double pos[3]);
  double* GetPoint1WorldPosition();
  void GetPoint1DisplayPosition(double pos[3]);
  double* GetPoint1DisplayPosition();
  void SetPoint1WorldPosition(double pos[3]);
  void SetPoint1DisplayPosition(double pos[3]);
  void GetPoint2DisplayPosition(double pos[3]);
  double* GetPoint2DisplayPosition();
  void GetPoint2WorldPosition(double pos[3]);
  double* GetPoint2WorldPosition();
  void SetPoint2WorldPosition(double pos[3]);
  void SetPoint2DisplayPosition(double pos[3]);

  // Description:
  // This method is used to specify the type of handle representation to
  // use for the three internal vtkHandleWidgets within vtkLineWidget2.
  // To use this method, create a dummy vtkHandleWidget (or subclass),
  // and then invoke this method with this dummy. Then the 
  // vtkLineRepresentation uses this dummy to clone three vtkHandleWidgets
  // of the same type. Make sure you set the handle representation before
  // the widget is enabled. (The method InstantiateHandleRepresentation()
  // is invoked by the vtkLineWidget2.)
  void SetHandleRepresentation(vtkPointHandleRepresentation3D *handle);
  void InstantiateHandleRepresentation();

  // Description:
  // Get the three handle representations used for the vtkLineWidget2. 
  vtkGetObjectMacro(Point1Representation,vtkPointHandleRepresentation3D);
  vtkGetObjectMacro(Point2Representation,vtkPointHandleRepresentation3D);
  vtkGetObjectMacro(LineHandleRepresentation,vtkPointHandleRepresentation3D);

  // Description:
  // Get the end-point (sphere) properties. The properties of the end-points 
  // when selected and unselected can be manipulated.
  vtkGetObjectMacro(EndPointProperty,vtkProperty);
  vtkGetObjectMacro(SelectedEndPointProperty,vtkProperty);

  // Description:
  // Get the line properties. The properties of the line when selected
  // and unselected can be manipulated.
  vtkGetObjectMacro(LineProperty,vtkProperty);
  vtkGetObjectMacro(SelectedLineProperty,vtkProperty);

  // Description:
  // The tolerance representing the distance to the widget (in pixels) in
  // which the cursor is considered near enough to the line or end point 
  // to be active.
  vtkSetClampMacro(Tolerance,int,1,100);
  vtkGetMacro(Tolerance,int);

  // Description:
  // Set/Get the resolution (number of subdivisions) of the line. A line with
  // resolution greater than one is useful when points along the line are
  // desired; e.g., generating a rake of streamlines.
  void SetResolution(int res);
  int GetResolution();

  // Description:
  // Retrieve the polydata (including points) that defines the line.  The
  // polydata consists of n+1 points, where n is the resolution of the
  // line. These point values are guaranteed to be up-to-date whenever any
  // one of the three handles are moved. To use this method, the user
  // provides the vtkPolyData as an input argument, and the points and
  // polyline are copied into it.
  void GetPolyData(vtkPolyData *pd);

  // Description:
  // These are methods that satisfy vtkWidgetRepresentation's API.
  virtual void PlaceWidget(double bounds[6]);
  virtual void BuildRepresentation();
  virtual int ComputeInteractionState(int X, int Y, int modify=0);
  virtual void StartWidgetInteraction(double e[2]);
  virtual void WidgetInteraction(double e[2]);
  virtual double *GetBounds();
  
  // Description:
  // Methods supporting the rendering process.
  virtual void ReleaseGraphicsResources(vtkWindow*);
  virtual int RenderOpaqueGeometry(vtkViewport*);
  virtual int RenderTranslucentPolygonalGeometry(vtkViewport*);
  virtual int HasTranslucentPolygonalGeometry();
  
//BTX - manage the state of the widget
  enum {Outside=0,OnP1,OnP2,TranslatingP1,TranslatingP2,OnLine,Scaling};
//ETX

  // Description:
  // The interaction state may be set from a widget (e.g., vtkLineWidget2) or
  // other object. This controls how the interaction with the widget
  // proceeds. Normally this method is used as part of a handshaking
  // process with the widget: First ComputeInteractionState() is invoked that
  // returns a state based on geometric considerations (i.e., cursor near a
  // widget feature), then based on events, the widget may modify this
  // further.
  vtkSetClampMacro(InteractionState,int,Outside,Scaling);

  // Description:
  // Sets the visual appearance of the representation based on the
  // state it is in. This state is usually the same as InteractionState.
  virtual void SetRepresentationState(int);
  vtkGetMacro(RepresentationState, int);

  // Description:
  // Overload the superclasses' GetMTime() because internal classes
  // are used to keep the state of the representation.
  virtual unsigned long GetMTime();

  // Description:
  // Overridden to set the rendererer on the internal representations.
  virtual void SetRenderer(vtkRenderer *ren);

protected:
  vtkLineRepresentation();
  ~vtkLineRepresentation();

  // The handle and the rep used to close the handles
  vtkPointHandleRepresentation3D *HandleRepresentation;
  vtkPointHandleRepresentation3D *Point1Representation;
  vtkPointHandleRepresentation3D *Point2Representation;
  vtkPointHandleRepresentation3D *LineHandleRepresentation;

  // Manage how the representation appears
  int RepresentationState;

  // the line
  vtkActor          *LineActor;
  vtkPolyDataMapper *LineMapper;
  vtkLineSource     *LineSource;

  // glyphs representing hot spots (e.g., handles)
  vtkActor          **Handle;
  vtkPolyDataMapper **HandleMapper;
  vtkSphereSource   **HandleGeometry;

  // Properties used to control the appearance of selected objects and
  // the manipulator in general.
  vtkProperty *EndPointProperty;
  vtkProperty *SelectedEndPointProperty;
  vtkProperty *LineProperty;
  vtkProperty *SelectedLineProperty;
  void         CreateDefaultProperties();

  // Selection tolerance for the handles and the line
  int Tolerance;

  // Helper members
  int  ClampToBounds;
  void ClampPosition(double x[3]);
  void HighlightPoint(int ptId, int highlight);
  void HighlightLine(int highlight);
  int  InBounds(double x[3]);
  void SizeHandles();

  // Ivars used during widget interaction to hold initial positions
  double StartP1[3];
  double StartP2[3];
  double StartLineHandle[3];
  double Length;
  double LastEventPosition[3];

  // Support GetBounds() method
  vtkBox *BoundingBox;
  
  // Need to keep track if we have successfully initialized the display position. 
  // The widget tends to do stuff in world coordinates, put if the renderer has
  // not been assigned, then certain operations do not properly update the display
  // position.
  int InitializedDisplayPosition;

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

#endif
