dox/Widgets/vtkBrokenLineWidget.h

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

  Program:   Visualization Toolkit
  Module:    vtkBrokenLineWidget.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.

=========================================================================*/
#ifndef __vtkBrokenLineWidget_h
#define __vtkBrokenLineWidget_h

#include "vtk3DWidget.h"

class vtkActor;
class vtkCellPicker;
class vtkLineSource;
class vtkPlaneSource;
class vtkPoints;
class vtkPolyData;
class vtkPolyDataMapper;
class vtkProp;
class vtkProperty;
class vtkSphereSource;
class vtkTransform;

#define VTK_PROJECTION_YZ 0
#define VTK_PROJECTION_XZ 1
#define VTK_PROJECTION_XY 2
#define VTK_PROJECTION_OBLIQUE 3

class VTK_WIDGETS_EXPORT vtkBrokenLineWidget : public vtk3DWidget
{
public:
  static vtkBrokenLineWidget *New();

  vtkTypeMacro(vtkBrokenLineWidget,vtk3DWidget);
  void PrintSelf(ostream& os, vtkIndent indent);


  virtual void SetEnabled(int);
  virtual void PlaceWidget(double bounds[6]);
  void PlaceWidget()
    {this->Superclass::PlaceWidget();}
  void PlaceWidget(double xmin, double xmax, double ymin, double ymax, 
                   double zmin, double zmax)
    {this->Superclass::PlaceWidget(xmin,xmax,ymin,ymax,zmin,zmax);}


  vtkSetMacro(ProjectToPlane,int);
  vtkGetMacro(ProjectToPlane,int);
  vtkBooleanMacro(ProjectToPlane,int);

  void SetPlaneSource(vtkPlaneSource* plane);

  vtkSetClampMacro(ProjectionNormal,int,VTK_PROJECTION_YZ,VTK_PROJECTION_OBLIQUE);
  vtkGetMacro(ProjectionNormal,int);
  void SetProjectionNormalToXAxes()
    { this->SetProjectionNormal(0); }
  void SetProjectionNormalToYAxes()
    { this->SetProjectionNormal(1); }
  void SetProjectionNormalToZAxes()
    { this->SetProjectionNormal(2); }
  void SetProjectionNormalToOblique()
    { this->SetProjectionNormal(3); }


  void SetProjectionPosition(double position);
  vtkGetMacro(ProjectionPosition, double);

  void GetPolyData(vtkPolyData *pd);


  virtual void SetHandleProperty(vtkProperty*);
  vtkGetObjectMacro(HandleProperty, vtkProperty);
  virtual void SetSelectedHandleProperty(vtkProperty*);
  vtkGetObjectMacro(SelectedHandleProperty, vtkProperty);


  virtual void SetLineProperty(vtkProperty*);
  vtkGetObjectMacro(LineProperty, vtkProperty);
  virtual void SetSelectedLineProperty(vtkProperty*);
  vtkGetObjectMacro(SelectedLineProperty, vtkProperty);


  virtual void SetNumberOfHandles(int npts);
  vtkGetMacro(NumberOfHandles, int);


  void SetHandlePosition(int handle, double x, double y, double z);
  void SetHandlePosition(int handle, double xyz[3]);
  void GetHandlePosition(int handle, double xyz[3]);
  double* GetHandlePosition(int handle);

  double GetSummedLength();

  void InitializeHandles(vtkPoints* points);


  vtkSetClampMacro(ProcessEvents, int, 0, 1);
  vtkGetMacro(ProcessEvents, int);
  vtkBooleanMacro( ProcessEvents, int );


  vtkSetClampMacro(HandleSizeFactor, double, 0., 100.);
  vtkGetMacro(HandleSizeFactor, double);

protected:
  vtkBrokenLineWidget();
  ~vtkBrokenLineWidget();

//BTX - manage the state of the widget
  int State;
  enum WidgetState
  {
    Start=0,
    Moving,
    Scaling,
    Spinning,
    Inserting,
    Erasing,
    Outside
  };
//ETX

  //handles the events
  static void ProcessEventsHandler(vtkObject* object,
                                   unsigned long event,
                                   void* clientdata,
                                   void* calldata);

  // ProcessEventsHandler() dispatches to these methods.
  void OnLeftButtonDown();
  void OnLeftButtonUp();
  void OnMiddleButtonDown();
  void OnMiddleButtonUp();
  void OnRightButtonDown();
  void OnRightButtonUp();
  void OnMouseMove();

  // Controlling vars
  int   ProjectionNormal;
  double ProjectionPosition;
  int   ProjectToPlane;
  vtkPlaneSource* PlaneSource;

  // Projection capabilities
  void ProjectPointsToPlane();
  void ProjectPointsToOrthoPlane();
  void ProjectPointsToObliquePlane();

  // The broken line
  vtkActor          *LineActor;
  vtkPolyDataMapper *LineMapper;
  vtkLineSource     *LineSource;
  void HighlightLine(int highlight);
  int NumberOfHandles;
  void BuildRepresentation();

  // Glyphs representing hot spots (e.g., handles)
  vtkActor          **Handle;
  vtkSphereSource   **HandleGeometry;
  void Initialize();
  int  HighlightHandle(vtkProp *prop); //returns handle index or -1 on fail
  virtual void SizeHandles();
  void InsertHandleOnLine(double* pos);
  void EraseHandle(const int&);

  // Do the picking
  vtkCellPicker *HandlePicker;
  vtkCellPicker *LinePicker;
  vtkActor *CurrentHandle;
  int CurrentHandleIndex;

  // Methods to manipulate the broken line.
  void MovePoint(double *p1, double *p2);
  void Scale(double *p1, double *p2, int X, int Y);
  void Translate(double *p1, double *p2);
  void Spin(double *p1, double *p2, double *vpn);

  // Transform the control points (used for spinning)
  vtkTransform *Transform;

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

  // For efficient spinning
  double Centroid[3];
  void CalculateCentroid();
  int  ProcessEvents;

  // Handle sizing factor
  double HandleSizeFactor;

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

#endif