libvtk6-dev 6.3.0+dfsg1-11build1 / usr / include / vtk-6.3 / vtkCellCentersPointPlacer.h

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

  Program:   Visualization Toolkit
  Module:    vtkCellCentersPointPlacer.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.

=========================================================================*/
// .NAME vtkCellCentersPointPlacer - Snaps points at the center of a cell
//
// .SECTION Description
// vtkCellCentersPointPlacer is a class to snap points on the center of cells.
// The class has 3 modes. In the ParametricCenter mode, it snaps points
// to the parametric center of the cell (see vtkCell). In CellPointsMean
// mode, points are snapped to the mean of the points in the cell.
// In 'None' mode, no snapping is performed. The computed world position
// is the picked position within the cell.
//
// .SECTION Usage
// The actors that render data and wish to be considered for placement
// by this placer are added to the list as
// \code
// placer->AddProp( actor );
// \endcode
//
// .SECTION See Also
// vtkPointPlacer

#ifndef vtkCellCentersPointPlacer_h
#define vtkCellCentersPointPlacer_h

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

class vtkRenderer;
class vtkPropCollection;
class vtkProp;
class vtkCellPicker;

class VTKINTERACTIONWIDGETS_EXPORT vtkCellCentersPointPlacer : public vtkPointPlacer
{
public:
  // Description:
  // Instantiate this class.
  static vtkCellCentersPointPlacer *New();

  // Description:
  // Standard methods for instances of this class.
  vtkTypeMacro(vtkCellCentersPointPlacer,vtkPointPlacer);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Descuription:
  // Add an actor (that represents a terrain in a rendererd scene) to the
  // list. Only props in this list are considered by the PointPlacer
  virtual void AddProp( vtkProp * );
  virtual void RemoveViewProp(vtkProp *prop);
  virtual void RemoveAllProps();
  int          HasProp( vtkProp * );
  int          GetNumberOfProps();

  // Description:
  // Given a renderer and a display position in pixel coordinates,
  // compute the world position and orientation where this point
  // will be placed. This method is typically used by the
  // representation to place the point initially.
  // For the Terrain point placer this computes world points that
  // lie at the specified height above the terrain.
  virtual int ComputeWorldPosition( vtkRenderer *ren,
                                    double displayPos[2],
                                    double worldPos[3],
                                    double worldOrient[9] );

  // Description:
  // Given a renderer, a display position, and a reference world
  // position, compute the new world position and orientation
  // of this point. This method is typically used by the
  // representation to move the point.
  virtual int ComputeWorldPosition( vtkRenderer *ren,
                                    double displayPos[2],
                                    double refWorldPos[3],
                                    double worldPos[3],
                                    double worldOrient[9] );

  // Description:
  // Given a world position check the validity of this
  // position according to the constraints of the placer
  virtual int ValidateWorldPosition( double worldPos[3] );

  // Description:
  // Given a display position, check the validity of this position.
  virtual int ValidateDisplayPosition( vtkRenderer *, double displayPos[2] );

  // Description:
  // Given a world position and a world orientation,
  // validate it according to the constraints of the placer.
  virtual int ValidateWorldPosition( double worldPos[3],
                                     double worldOrient[9] );

  // Description:
  // Get the Prop picker.
  vtkGetObjectMacro( CellPicker, vtkCellPicker );

  // Description:
  // Modes to change the point placement. Parametric center picks
  // the parametric center within the cell. CellPointsMean picks
  // the average of all points in the cell. When the mode is None,
  // the input point is passed through unmodified. Default is CellPointsMean.
  vtkSetMacro( Mode, int );
  vtkGetMacro( Mode, int );

  enum
    {
    ParametricCenter = 0,
    CellPointsMean,
    None
    };

protected:
  vtkCellCentersPointPlacer();
  ~vtkCellCentersPointPlacer();

  // The props that represents the terrain data (one or more) in a rendered
  // scene
  vtkPropCollection  *PickProps;
  vtkCellPicker      *CellPicker;
  int                 Mode;

private:
  vtkCellCentersPointPlacer(const vtkCellCentersPointPlacer&);  //Not implemented
  void operator=(const vtkCellCentersPointPlacer&);  //Not implemented
};

#endif

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