vtkLineWidget.h

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

  Program:   Visualization Toolkit
  Module:    vtkLineWidget.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 vtkLineWidget_h
#define vtkLineWidget_h

#include "vtkInteractionWidgetsModule.h" // For export macro
#include "vtk3DWidget.h"
#include "vtkLineSource.h" // For passing calls to it

class vtkActor;
class vtkPolyDataMapper;
class vtkPoints;
class vtkPolyData;
class vtkProp;
class vtkProperty;
class vtkSphereSource;
class vtkCellPicker;
class vtkPointWidget;
class vtkPWCallback;
class vtkPW1Callback;
class vtkPW2Callback;

class VTKINTERACTIONWIDGETS_EXPORT vtkLineWidget : public vtk3DWidget
{
public:
  static vtkLineWidget *New();

  vtkTypeMacro(vtkLineWidget,vtk3DWidget);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  void SetEnabled(int) override;
  void PlaceWidget(double bounds[6]) override;
  void PlaceWidget() override
    {this->Superclass::PlaceWidget();}
  void PlaceWidget(double xmin, double xmax, double ymin, double ymax,
                   double zmin, double zmax) override
    {this->Superclass::PlaceWidget(xmin,xmax,ymin,ymax,zmin,zmax);}

  void SetResolution(int r)
    { this->LineSource->SetResolution(r); }
  int GetResolution()
    { return this->LineSource->GetResolution(); }

  void SetPoint1(double x, double y, double z);
  void SetPoint1(double x[3])
    {this->SetPoint1(x[0], x[1], x[2]); }
  double* GetPoint1() VTK_SIZEHINT(3)
    {return this->LineSource->GetPoint1();}
  void GetPoint1(double xyz[3])
    {this->LineSource->GetPoint1(xyz);}

  void SetPoint2(double x, double y, double z);
  void SetPoint2(double x[3])
    {this->SetPoint2(x[0], x[1], x[2]);}
  double* GetPoint2() VTK_SIZEHINT(3)
    {return this->LineSource->GetPoint2();}
  void GetPoint2(double xyz[3])
    {this->LineSource->GetPoint2(xyz);}


  vtkSetClampMacro(Align, int, XAxis, None);
  vtkGetMacro(Align, int);
  void SetAlignToXAxis() { this->SetAlign(XAxis); }
  void SetAlignToYAxis() { this->SetAlign(YAxis); }
  void SetAlignToZAxis() { this->SetAlign(ZAxis); }
  void SetAlignToNone()  { this->SetAlign(None); }


  vtkSetMacro(ClampToBounds,vtkTypeBool);
  vtkGetMacro(ClampToBounds,vtkTypeBool);
  vtkBooleanMacro(ClampToBounds,vtkTypeBool);

  void GetPolyData(vtkPolyData *pd);


  vtkGetObjectMacro(HandleProperty,vtkProperty);
  vtkGetObjectMacro(SelectedHandleProperty,vtkProperty);


  vtkGetObjectMacro(LineProperty,vtkProperty);
  vtkGetObjectMacro(SelectedLineProperty,vtkProperty);

protected:
  vtkLineWidget();
  ~vtkLineWidget() override;

  // Manage the state of the widget
  friend class vtkPWCallback;

  int State;
  enum WidgetState
  {
    Start=0,
    MovingHandle,
    MovingLine,
    Scaling,
    Outside
  };

  //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 OnMiddleButtonDown();
  void OnMiddleButtonUp();
  void OnRightButtonDown();
  void OnRightButtonUp();
  virtual void OnMouseMove();

  // controlling ivars
  int Align;

  enum AlignmentState {
    XAxis,
    YAxis,
    ZAxis,
    None
  };

  // the line
  vtkActor          *LineActor;
  vtkPolyDataMapper *LineMapper;
  vtkLineSource     *LineSource;
  void HighlightLine(int highlight);

  // glyphs representing hot spots (e.g., handles)
  vtkActor          **Handle;
  vtkPolyDataMapper **HandleMapper;
  vtkSphereSource   **HandleGeometry;

  void BuildRepresentation();
  void SizeHandles() override;
  void HandlesOn(double length);
  void HandlesOff();
  int HighlightHandle(vtkProp *prop); //returns cell id
  void HighlightHandles(int highlight);

  // Do the picking
  vtkCellPicker *HandlePicker;
  vtkCellPicker *LinePicker;
  vtkActor *CurrentHandle;
  double LastPosition[3];
  void  SetLinePosition(double x[3]);

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

  // Methods to manipulate the hexahedron.
  void Scale(double *p1, double *p2, int X, int Y);

  // Initial bounds
  vtkTypeBool   ClampToBounds;
  void  ClampPosition(double x[3]);
  int   InBounds(double x[3]);

  // Properties used to control the appearance of selected objects and
  // the manipulator in general.
  vtkProperty *HandleProperty;
  vtkProperty *SelectedHandleProperty;
  vtkProperty *LineProperty;
  vtkProperty *SelectedLineProperty;
  void CreateDefaultProperties();

  void GenerateLine();

  // Methods for managing the point widgets used to control the endpoints
  vtkPointWidget *PointWidget;
  vtkPointWidget *PointWidget1;
  vtkPointWidget *PointWidget2;
  vtkPWCallback  *PWCallback;
  vtkPW1Callback *PW1Callback;
  vtkPW2Callback *PW2Callback;
  vtkPointWidget *CurrentPointWidget;
  void EnablePointWidget();
  void DisablePointWidget();
  int ForwardEvent(unsigned long event);

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

#endif