vtkXYPlotWidget.h

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

  Program:   Visualization Toolkit
  Module:    vtkXYPlotWidget.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 vtkXYPlotWidget_h
#define vtkXYPlotWidget_h

#include "vtkInteractionWidgetsModule.h" // For export macro
#include "vtkInteractorObserver.h"
class vtkXYPlotActor;

class VTKINTERACTIONWIDGETS_EXPORT vtkXYPlotWidget : public vtkInteractorObserver
{
public:
  static vtkXYPlotWidget *New();
  vtkTypeMacro(vtkXYPlotWidget,vtkInteractorObserver);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  virtual void SetXYPlotActor(vtkXYPlotActor *);
  vtkGetObjectMacro(XYPlotActor,vtkXYPlotActor);

  void SetEnabled(int) override;

protected:
  vtkXYPlotWidget();
  ~vtkXYPlotWidget() override;

  // the actor that is used
  vtkXYPlotActor *XYPlotActor;

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

  // ProcessEvents() dispatches to these methods.
  void OnLeftButtonDown();
  void OnLeftButtonUp();
  void OnMouseMove();

  // used to compute relative movements
  float StartPosition[2];

  // Manage the state of the widget
  int State;
  enum WidgetState
  {
    Moving=0,
    AdjustingP1,
    AdjustingP2,
    AdjustingP3,
    AdjustingP4,
    AdjustingE1,
    AdjustingE2,
    AdjustingE3,
    AdjustingE4,
    Inside,
    Outside
  };

  // use to determine what state the mouse is over, edge1 p1, etc.
  // returns a state from the WidgetState enum above
  int ComputeStateBasedOnPosition(int X, int Y, int *pos1, int *pos2);

  // set the cursor to the correct shape based on State argument
  void SetCursor(int State);

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

#endif