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

  Program:   Visualization Toolkit
  Module:    vtkSeedRepresentation.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   vtkSeedRepresentation
 * @brief   represent the vtkSeedWidget
 *
 * The vtkSeedRepresentation is a superclass for classes representing the
 * vtkSeedWidget. This representation consists of one or more handles
 * (vtkHandleRepresentation) which are used to place and manipulate the
 * points defining the collection of seeds.
 *
 * @sa
 * vtkSeedWidget vtkHandleRepresentation vtkSeedRepresentation
 */

#ifndef vtkSeedRepresentation_h
#define vtkSeedRepresentation_h

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

class vtkHandleList;
class vtkHandleRepresentation;

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

  //@{
  /**
   * Standard VTK methods.
   */
  vtkTypeMacro(vtkSeedRepresentation, vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent) override;
  //@}

  //@{
  /**
   * Methods to Set/Get the coordinates of seed points defining
   * this representation. Note that methods are available for both
   * display and world coordinates. The seeds are accessed by a seed
   * number.
   */
  virtual void GetSeedWorldPosition(unsigned int seedNum, double pos[3]);
  virtual void SetSeedWorldPosition(unsigned int seedNum, double pos[3]);
  virtual void SetSeedDisplayPosition(unsigned int seedNum, double pos[3]);
  virtual void GetSeedDisplayPosition(unsigned int seedNum, double pos[3]);
  //@}

  /**
   * Return the number of seeds (or handles) that have been created.
   */
  int GetNumberOfSeeds();

  /**
   * This method is used to specify the type of handle representation to use
   * for the internal vtkHandleWidgets within vtkSeedWidget.  To use this
   * method, create a dummy vtkHandleWidget (or subclass), and then invoke
   * this method with this dummy. Then the vtkSeedRepresentation uses this
   * dummy to clone vtkHandleWidgets of the same type. Make sure you set the
   * handle representation before the widget is enabled.
   */
  void SetHandleRepresentation(vtkHandleRepresentation* handle);

  /**
   * Get the handle representations used for a particular seed. A side effect of
   * this method is that it will create a handle representation in the list of
   * representations if one has not yet been created.
   */
  vtkHandleRepresentation* GetHandleRepresentation(unsigned int num);

  //@{
  /**
   * Returns the model HandleRepresentation.
   */
  vtkHandleRepresentation* GetHandleRepresentation() { return this->HandleRepresentation; };
  //@}

  //@{
  /**
   * The tolerance representing the distance to the widget (in pixels) in
   * which the cursor is considered near enough to the seed points of
   * the widget to be active.
   */
  vtkSetClampMacro(Tolerance, int, 1, 100);
  vtkGetMacro(Tolerance, int);
  //@}

  // Used to communicate about the state of the representation
  enum
  {
    Outside = 0,
    NearSeed
  };

  //@{
  /**
   * These are methods specific to vtkSeedRepresentation and which are
   * invoked from vtkSeedWidget.
   */
  virtual int GetActiveHandle();
  virtual void SetActiveHandle(int handleId);
  // Returns the id of the seed created, -1 on failure. e is the display position.
  virtual int CreateHandle(double e[2]);
  // Delete last handle created
  virtual void RemoveLastHandle();
  // Delete the currently active handle
  virtual void RemoveActiveHandle();
  //@}

  /**
   * Remove the nth handle.
   */
  virtual void RemoveHandle(int n);

  //@{
  /**
   * These are methods that satisfy vtkWidgetRepresentation's API.
   */
  void BuildRepresentation() override;
  int ComputeInteractionState(int X, int Y, int modify = 0) override;
  //@}

protected:
  vtkSeedRepresentation();
  ~vtkSeedRepresentation() override;

  // The handle and the rep used to close the handles
  vtkHandleRepresentation* HandleRepresentation;
  vtkHandleList* Handles;

  // Selection tolerance for the handles
  int Tolerance;

  // The active seed (handle) based on the last ComputeInteractionState()
  int ActiveHandle;

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

#endif