vtkCurveRepresentation.h

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

  Program:   Visualization Toolkit
  Module:    vtkCurveRepresentation

  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 vtkCurveRepresentation_h
#define vtkCurveRepresentation_h

#include "vtkInteractionWidgetsModule.h" // For export macro
#include "vtkWidgetRepresentation.h"

class vtkActor;
class vtkCellPicker;
class vtkDoubleArray;
class vtkPlaneSource;
class vtkPoints;
class vtkPolyData;
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 VTKINTERACTIONWIDGETS_EXPORT vtkCurveRepresentation : public vtkWidgetRepresentation
{
public:
  vtkTypeMacro(vtkCurveRepresentation, vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  // Used to manage the InteractionState of the widget
  enum _InteractionState {
    Outside=0,
    OnHandle,
    OnLine,
    Moving,
    Scaling,
    Spinning,
    Inserting,
    Erasing,
    Pushing
  };


  vtkSetMacro(InteractionState, int);


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

  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);

  virtual void GetPolyData(vtkPolyData *pd) = 0;


  vtkGetObjectMacro(HandleProperty, vtkProperty);
  vtkGetObjectMacro(SelectedHandleProperty, vtkProperty);


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


  virtual void SetNumberOfHandles(int npts) = 0;
  vtkGetMacro(NumberOfHandles, int);


  virtual void SetHandlePosition(int handle, double x, double y, double z);
  virtual void SetHandlePosition(int handle, double xyz[3]);
  virtual void GetHandlePosition(int handle, double xyz[3]);
  virtual double* GetHandlePosition(int handle);
  virtual vtkDoubleArray* GetHandlePositions() = 0;


  void SetClosed(vtkTypeBool closed);
  vtkGetMacro(Closed,vtkTypeBool);
  vtkBooleanMacro(Closed,vtkTypeBool);

  vtkTypeBool IsClosed();

  virtual double GetSummedLength() = 0;

  virtual void InitializeHandles(vtkPoints* points) = 0;


  void BuildRepresentation() override = 0;
  int ComputeInteractionState(int X, int Y, int modify=0) override;
  void StartWidgetInteraction(double e[2]) override;
  void WidgetInteraction(double e[2]) override;
  void EndWidgetInteraction(double e[2]) override;
  double *GetBounds() override;


  void ReleaseGraphicsResources(vtkWindow*) override;
  int RenderOpaqueGeometry(vtkViewport*) override;
  int RenderTranslucentPolygonalGeometry(vtkViewport*) override;
  int RenderOverlay(vtkViewport*) override;
  vtkTypeBool HasTranslucentPolygonalGeometry() override;

  void SetLineColor(double r, double g, double b);

  /*
  * Register internal Pickers within PickingManager
  */
  void RegisterPickers() override;

protected:
  vtkCurveRepresentation();
  ~vtkCurveRepresentation() override;

  double LastEventPosition[3];
  double Bounds[6];

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

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

  int NumberOfHandles;
  vtkTypeBool Closed;

  // The line segments
  vtkActor           *LineActor;
  void HighlightLine(int highlight);

  // 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();
  virtual void InsertHandleOnLine(double* pos) = 0;
  virtual void PushHandle(double* pos);
  void EraseHandle(const int&);

  // Do the picking
  vtkCellPicker *HandlePicker;
  vtkCellPicker *LinePicker;
  double LastPickPosition[3];
  vtkActor *CurrentHandle;
  int CurrentHandleIndex;
  bool FirstSelected;

  // Methods to manipulate the curve.
  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();

private:
  vtkCurveRepresentation(const vtkCurveRepresentation&) = delete;
  void operator=(const vtkCurveRepresentation&) = delete;

};


#endif