dox/Widgets/vtkLineRepresentation.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkLineRepresentation.h,v $

  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 __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:
  static vtkLineRepresentation *New();


  vtkTypeRevisionMacro(vtkLineRepresentation,vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent);


  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]);


  void SetHandleRepresentation(vtkPointHandleRepresentation3D *handle);
  void InstantiateHandleRepresentation();


  vtkGetObjectMacro(Point1Representation,vtkPointHandleRepresentation3D);
  vtkGetObjectMacro(Point2Representation,vtkPointHandleRepresentation3D);
  vtkGetObjectMacro(LineHandleRepresentation,vtkPointHandleRepresentation3D);


  vtkGetObjectMacro(EndPointProperty,vtkProperty);
  vtkGetObjectMacro(SelectedEndPointProperty,vtkProperty);


  vtkGetObjectMacro(LineProperty,vtkProperty);
  vtkGetObjectMacro(SelectedLineProperty,vtkProperty);


  vtkSetClampMacro(Tolerance,int,1,100);
  vtkGetMacro(Tolerance,int);


  void SetResolution(int res);
  int GetResolution();

  void GetPolyData(vtkPolyData *pd);


  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();
  

  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


  vtkSetClampMacro(InteractionState,int,Outside,Scaling);


  virtual void SetRepresentationState(int);
  vtkGetMacro(RepresentationState, int);

  virtual unsigned long GetMTime();

  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

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