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

  Program:   Visualization Toolkit
  Module:    vtkBoxRepresentation.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.

=========================================================================*/
/**
 * @class   vtkBoxRepresentation
 * @brief   a class defining the representation for the vtkBoxWidget2
 *
 * This class is a concrete representation for the vtkBoxWidget2. It
 * represents a box with seven handles: one on each of the six faces, plus a
 * center handle. Through interaction with the widget, the box
 * representation can be arbitrarily positioned in the 3D space.
 *
 * To use this representation, you normally use the PlaceWidget() method
 * to position the widget at a specified region in space.
 *
 * @warning
 * This class, and vtkBoxWidget2, are second generation VTK
 * widgets. An earlier version of this functionality was defined in the
 * class vtkBoxWidget.
 *
 * @sa
 * vtkBoxWidget2 vtkBoxWidget
*/

#ifndef vtkBoxRepresentation_h
#define vtkBoxRepresentation_h

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

class vtkActor;
class vtkPolyDataMapper;
class vtkLineSource;
class vtkSphereSource;
class vtkCellPicker;
class vtkProperty;
class vtkPolyData;
class vtkPoints;
class vtkPolyDataAlgorithm;
class vtkPointHandleRepresentation3D;
class vtkTransform;
class vtkPlanes;
class vtkBox;
class vtkDoubleArray;
class vtkMatrix4x4;


class VTKINTERACTIONWIDGETS_EXPORT vtkBoxRepresentation : public vtkWidgetRepresentation
{
public:
  /**
   * Instantiate the class.
   */
  static vtkBoxRepresentation *New();

  //@{
  /**
   * Standard methods for the class.
   */
  vtkTypeMacro(vtkBoxRepresentation,vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent) override;
  //@}

  /**
   * Get the planes describing the implicit function defined by the box
   * widget. The user must provide the instance of the class vtkPlanes. Note
   * that vtkPlanes is a subclass of vtkImplicitFunction, meaning that it can
   * be used by a variety of filters to perform clipping, cutting, and
   * selection of data.  (The direction of the normals of the planes can be
   * reversed enabling the InsideOut flag.)
   */
  void GetPlanes(vtkPlanes *planes);

  //@{
  /**
   * Set/Get the InsideOut flag. This data member is used in conjunction
   * with the GetPlanes() method. When off, the normals point out of the
   * box. When on, the normals point into the hexahedron.  InsideOut is off
   * by default.
   */
  vtkSetMacro(InsideOut,int);
  vtkGetMacro(InsideOut,int);
  vtkBooleanMacro(InsideOut,int);
  //@}

  /**
   * Retrieve a linear transform characterizing the transformation of the
   * box. Note that the transformation is relative to where PlaceWidget()
   * was initially called. This method modifies the transform provided. The
   * transform can be used to control the position of vtkProp3D's, as well as
   * other transformation operations (e.g., vtkTranformPolyData).
   */
  virtual void GetTransform(vtkTransform *t);

  /**
   * Set the position, scale and orientation of the box widget using the
   * transform specified. Note that the transformation is relative to
   * where PlaceWidget() was initially called (i.e., the original bounding
   * box).
   */
  virtual void SetTransform(vtkTransform* t);

  /**
   * Grab the polydata (including points) that define the box widget. The
   * polydata consists of 6 quadrilateral faces and 15 points. The first
   * eight points define the eight corner vertices; the next six define the
   * -x,+x, -y,+y, -z,+z face points; and the final point (the 15th out of 15
   * points) defines the center of the box. These point values are guaranteed
   * to be up-to-date when either the widget's corresponding InteractionEvent
   * or EndInteractionEvent events are invoked. The user provides the
   * vtkPolyData and the points and cells are added to it.
   */
  void GetPolyData(vtkPolyData *pd);

  //@{
  /**
   * Get the handle properties (the little balls are the handles). The
   * properties of the handles, when selected or normal, can be
   * specified.
   */
  vtkGetObjectMacro(HandleProperty,vtkProperty);
  vtkGetObjectMacro(SelectedHandleProperty,vtkProperty);
  //@}

  //@{
  /**
   * Get the face properties (the faces of the box). The
   * properties of the face when selected and normal can be
   * set.
   */
  vtkGetObjectMacro(FaceProperty,vtkProperty);
  vtkGetObjectMacro(SelectedFaceProperty,vtkProperty);
  //@}

  //@{
  /**
   * Get the outline properties (the outline of the box). The
   * properties of the outline when selected and normal can be
   * set.
   */
  vtkGetObjectMacro(OutlineProperty,vtkProperty);
  vtkGetObjectMacro(SelectedOutlineProperty,vtkProperty);
  //@}

  //@{
  /**
   * Control the representation of the outline. This flag enables
   * face wires. By default face wires are off.
   */
  void SetOutlineFaceWires(int);
  vtkGetMacro(OutlineFaceWires,int);
  void OutlineFaceWiresOn() {this->SetOutlineFaceWires(1);}
  void OutlineFaceWiresOff() {this->SetOutlineFaceWires(0);}
  //@}

  //@{
  /**
   * Control the representation of the outline. This flag enables
   * the cursor lines running between the handles. By default cursor
   * wires are on.
   */
  void SetOutlineCursorWires(int);
  vtkGetMacro(OutlineCursorWires,int);
  void OutlineCursorWiresOn() {this->SetOutlineCursorWires(1);}
  void OutlineCursorWiresOff() {this->SetOutlineCursorWires(0);}
  //@}

  //@{
  /**
   * Switches handles (the spheres) on or off by manipulating the underlying
   * actor visibility.
   */
  virtual void HandlesOn();
  virtual void HandlesOff();
  //@}

  //@{
  /**
   * These are methods that satisfy vtkWidgetRepresentation's API.
   */
  void PlaceWidget(double bounds[6]) override;
  void BuildRepresentation() override;
  int  ComputeInteractionState(int X, int Y, int modify=0) override;
  void StartWidgetInteraction(double e[2]) override;
  void WidgetInteraction(double e[2]) override;
  double *GetBounds() override;
  //@}

  //@{
  /**
   * Methods supporting, and required by, the rendering process.
   */
  void ReleaseGraphicsResources(vtkWindow*) override;
  int  RenderOpaqueGeometry(vtkViewport*) override;
  int  RenderTranslucentPolygonalGeometry(vtkViewport*) override;
  int  HasTranslucentPolygonalGeometry() override;
  //@}

  // Used to manage the state of the widget
  enum {Outside=0,MoveF0,MoveF1,MoveF2,MoveF3,MoveF4,MoveF5,Translating,Rotating,Scaling};

  /**
   * The interaction state may be set from a widget (e.g., vtkBoxWidget2) 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.
   */
  void SetInteractionState(int state);

protected:
  vtkBoxRepresentation();
  ~vtkBoxRepresentation() override;

  // Manage how the representation appears
  double LastEventPosition[3];

  // the hexahedron (6 faces)
  vtkActor          *HexActor;
  vtkPolyDataMapper *HexMapper;
  vtkPolyData       *HexPolyData;
  vtkPoints         *Points;  //used by others as well
  double             N[6][3]; //the normals of the faces

  // A face of the hexahedron
  vtkActor          *HexFace;
  vtkPolyDataMapper *HexFaceMapper;
  vtkPolyData       *HexFacePolyData;

  // glyphs representing hot spots (e.g., handles)
  vtkActor          **Handle;
  vtkPolyDataMapper **HandleMapper;
  vtkSphereSource   **HandleGeometry;
  virtual void PositionHandles();
  int HighlightHandle(vtkProp *prop); //returns cell id
  void HighlightFace(int cellId);
  void HighlightOutline(int highlight);
  virtual void ComputeNormals();
  virtual void SizeHandles();

  // wireframe outline
  vtkActor          *HexOutline;
  vtkPolyDataMapper *OutlineMapper;
  vtkPolyData       *OutlinePolyData;

  // Do the picking
  vtkCellPicker *HandlePicker;
  vtkCellPicker *HexPicker;
  vtkActor *CurrentHandle;
  int      CurrentHexFace;
  vtkCellPicker *LastPicker;

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

  // Transform the hexahedral points (used for rotations)
  vtkTransform *Transform;

  // Support GetBounds() method
  vtkBox *BoundingBox;

  // Properties used to control the appearance of selected objects and
  // the manipulator in general.
  vtkProperty *HandleProperty;
  vtkProperty *SelectedHandleProperty;
  vtkProperty *FaceProperty;
  vtkProperty *SelectedFaceProperty;
  vtkProperty *OutlineProperty;
  vtkProperty *SelectedOutlineProperty;
  virtual void CreateDefaultProperties();

  // Control the orientation of the normals
  int InsideOut;
  int OutlineFaceWires;
  int OutlineCursorWires;
  void GenerateOutline();

  // Helper methods
  virtual void Translate(double *p1, double *p2);
  virtual void Scale(double *p1, double *p2, int X, int Y);
  virtual void Rotate(int X, int Y, double *p1, double *p2, double *vpn);
  void MovePlusXFace(double *p1, double *p2);
  void MoveMinusXFace(double *p1, double *p2);
  void MovePlusYFace(double *p1, double *p2);
  void MoveMinusYFace(double *p1, double *p2);
  void MovePlusZFace(double *p1, double *p2);
  void MoveMinusZFace(double *p1, double *p2);

  // Internal ivars for performance
  vtkPoints      *PlanePoints;
  vtkDoubleArray *PlaneNormals;
  vtkMatrix4x4   *Matrix;

  //"dir" is the direction in which the face can be moved i.e. the axis passing
  //through the center
  void MoveFace(double *p1, double *p2, double *dir,
                double *x1, double *x2, double *x3, double *x4,
                double *x5);
  //Helper method to obtain the direction in which the face is to be moved.
  //Handles special cases where some of the scale factors are 0.
  void GetDirection(const double Nx[3],const double Ny[3],
                    const double Nz[3], double dir[3]);


private:
  vtkBoxRepresentation(const vtkBoxRepresentation&) = delete;
  void operator=(const vtkBoxRepresentation&) = delete;
};

#endif