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vtkCellCentersPointPlacer.h
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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.
=========================================================================*/
/**
* @class vtkCellCentersPointPlacer
* @brief Snaps points at the center of a cell
*
*
* 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.
*
* @par 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
*
* @sa
* 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:
/**
* Instantiate this class.
*/
static vtkCellCentersPointPlacer *New();
//@{
/**
* Standard methods for instances of this class.
*/
vtkTypeMacro(vtkCellCentersPointPlacer,vtkPointPlacer);
void PrintSelf(ostream& os, vtkIndent indent) override;
//@}
// 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();
/**
* 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.
*/
int ComputeWorldPosition( vtkRenderer *ren,
double displayPos[2],
double worldPos[3],
double worldOrient[9] ) override;
/**
* 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.
*/
int ComputeWorldPosition( vtkRenderer *ren,
double displayPos[2],
double refWorldPos[3],
double worldPos[3],
double worldOrient[9] ) override;
/**
* Given a world position check the validity of this
* position according to the constraints of the placer
*/
int ValidateWorldPosition( double worldPos[3] ) override;
/**
* Given a display position, check the validity of this position.
*/
int ValidateDisplayPosition( vtkRenderer *, double displayPos[2] ) override;
/**
* Given a world position and a world orientation,
* validate it according to the constraints of the placer.
*/
int ValidateWorldPosition( double worldPos[3],
double worldOrient[9] ) override;
//@{
/**
* Get the Prop picker.
*/
vtkGetObjectMacro( CellPicker, vtkCellPicker );
//@}
//@{
/**
* 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() override;
// The props that represents the terrain data (one or more) in a rendered
// scene
vtkPropCollection *PickProps;
vtkCellPicker *CellPicker;
int Mode;
private:
vtkCellCentersPointPlacer(const vtkCellCentersPointPlacer&) = delete;
void operator=(const vtkCellCentersPointPlacer&) = delete;
};
#endif