vtkPiecewisePointHandleItem.h

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

  Program:   Visualization Toolkit
  Module:    vtkPiecewisePointHandleItem.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 vtkPiecewisePointHandleItem_h
#define vtkPiecewisePointHandleItem_h

#include "vtkChartsCoreModule.h" // For export macro
#include "vtkContextItem.h"
#include "vtkWeakPointer.h" // Needed for weak pointer to the PiecewiseFunction.

class vtkContext2D;
class vtkPiecewiseFunction;
class vtkCallbackCommand;
class vtkAbstractContextItem;

class VTKCHARTSCORE_EXPORT vtkPiecewisePointHandleItem : public vtkContextItem
{
public:
  vtkTypeMacro(vtkPiecewisePointHandleItem, vtkContextItem);
  void PrintSelf(ostream &os, vtkIndent indent) override;

  static vtkPiecewisePointHandleItem *New();
  static void CallRedraw(vtkObject* sender, unsigned long event, void* receiver, void* params);

  void SetParent(vtkAbstractContextItem *parent) override;

  bool Paint(vtkContext2D *painter) override;


  vtkSetMacro(CurrentPointIndex, vtkIdType);
  vtkGetMacro(CurrentPointIndex, vtkIdType);


  virtual void SetPiecewiseFunction(vtkPiecewiseFunction* piecewiseFunc);
  vtkWeakPointer<vtkPiecewiseFunction> GetPiecewiseFunction();

  int IsOverHandle(float* pos);

  bool Hit(const vtkContextMouseEvent &mouse) override;

  bool MouseMoveEvent(const vtkContextMouseEvent &mouse) override;

  bool MouseButtonPressEvent(const vtkContextMouseEvent &mouse) override;

  bool MouseButtonReleaseEvent(const vtkContextMouseEvent &mouse) override;

protected:
  vtkPiecewisePointHandleItem();
  ~vtkPiecewisePointHandleItem() override;

  virtual void Redraw();

  int MouseOverHandleIndex;
  vtkIdType CurrentPointIndex;
  float HandleRadius;

  vtkWeakPointer<vtkPiecewiseFunction> PiecewiseFunction;
  vtkCallbackCommand* Callback;

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

  class InternalPiecewisePointHandleInfo;
  InternalPiecewisePointHandleInfo* Internal;

};

#endif //vtkPiecewisePointHandleItem_h