vtkOrientationMarkerWidget.h

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

  Program:   Visualization Toolkit
  Module:    vtkOrientationMarkerWidget.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 vtkOrientationMarkerWidget_h
#define vtkOrientationMarkerWidget_h

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

class vtkActor2D;
class vtkPolyData;
class vtkProp;
class vtkOrientationMarkerWidgetObserver;
class vtkRenderer;

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


  virtual void SetOrientationMarker(vtkProp *prop);
  vtkGetObjectMacro(OrientationMarker, vtkProp);

  virtual void SetEnabled(int);

  void ExecuteCameraUpdateEvent(vtkObject *o, unsigned long event, void *calldata);


  void SetInteractive(int state);
  vtkGetMacro(Interactive, int);
  vtkBooleanMacro(Interactive, int);


  void SetOutlineColor(double r, double g, double b);
  double *GetOutlineColor();


  vtkSetVector4Macro(Viewport, double);
  vtkGetVector4Macro(Viewport, double);


  vtkSetClampMacro(Tolerance,int,1,10);
  vtkGetMacro(Tolerance,int);

protected:
  vtkOrientationMarkerWidget();
  ~vtkOrientationMarkerWidget();

  vtkRenderer *Renderer;
  vtkProp     *OrientationMarker;
  vtkPolyData *Outline;
  vtkActor2D  *OutlineActor;

  unsigned long StartEventObserverId;

  static void ProcessEvents(vtkObject *object, unsigned long event,
                            void *clientdata, void *calldata);

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

  // observer to update the renderer's camera
  vtkOrientationMarkerWidgetObserver *Observer;

  int Interactive;
  int Tolerance;
  int Moving;

  // viewport to position/size this widget
  double Viewport[4];

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

  // Manage the state of the widget
  int State;
  enum WidgetState
  {
    Outside = 0,
    Inside,
    Translating,
    AdjustingP1,
    AdjustingP2,
    AdjustingP3,
    AdjustingP4
  };


  // 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);

  // adjust the viewport depending on state
  void MoveWidget(int X, int Y);
  void ResizeTopLeft(int X, int Y);
  void ResizeTopRight(int X, int Y);
  void ResizeBottomLeft(int X, int Y);
  void ResizeBottomRight(int X, int Y);

  void SquareRenderer();
  void UpdateOutline();
  void UpdateViewport();

private:
  vtkOrientationMarkerWidget(const vtkOrientationMarkerWidget&) VTK_DELETE_FUNCTION;
  void operator=(const vtkOrientationMarkerWidget&) VTK_DELETE_FUNCTION;
};

#endif