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Program: Visualization Toolkit
Module: vtkPolygonalSurfacePointPlacer.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or for details.
This software is distributed WITHOUT ANY WARRANTY; without even
PURPOSE. See the above copyright notice for more information.
// .NAME - Place points on the surface of polygonal data.
// .SECTION Description
// vtkPolygonalSurfacePointPlacer places points on polygonal data and is
// meant to be used in conjunction with
// vtkPolygonalSurfaceContourLineInterpolator.
// .SECTION Usage
// .SECTION Caveats
// You should have computed cell normals for the input polydata if you are
// specifying a distance offset.
// .SECTION See Also
// vtkPointPlacer vtkPolyDataNormals
#ifndef __vtkPolygonalSurfacePointPlacer_h
#define __vtkPolygonalSurfacePointPlacer_h
#include "vtkPolyDataPointPlacer.h"
class vtkPolyDataCollection;
class vtkCellPicker;
class vtkPolygonalSurfacePointPlacerInternals;
class vtkPolyData;
// The Node stores information about the point. This information is used by
// the interpolator. Reusing this information avoids the need for a second
// pick operation to regenerate it. (Cellpickers are slow).
struct vtkPolygonalSurfacePointPlacerNode
double WorldPosition[3];
double SurfaceWorldPosition[3];
vtkIdType CellId;
double ParametricCoords[3]; // parametric coords within cell
vtkPolyData *PolyData;
class VTK_WIDGETS_EXPORT vtkPolygonalSurfacePointPlacer
: public vtkPolyDataPointPlacer
// Description:
// Instantiate this class.
static vtkPolygonalSurfacePointPlacer *New();
// Description:
// Standard methods for instances of this class.
void PrintSelf(ostream& os, vtkIndent indent);
// Descuription:
// Add /remove a prop, to place points on
virtual void AddProp( vtkProp * );
virtual void RemoveViewProp(vtkProp *prop);
virtual void RemoveAllProps();
// 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:
// Be sure to add polydata on which you wish to place points to this list
// or they will not be considered for placement.
vtkGetObjectMacro( Polys, vtkPolyDataCollection );
// Description:
// Height offset at which points may be placed on the polygonal surface.
// If you specify a non-zero value here, be sure to compute cell normals
// on your input polygonal data (easily done with vtkPolyDataNormals).
vtkSetMacro( DistanceOffset, double );
vtkGetMacro( DistanceOffset, double );
// Description:
// Internally used by the interpolator.
typedef vtkPolygonalSurfacePointPlacerNode Node;
Node *GetNodeAtWorldPosition( double worldPos[3] );
// The props that represents the terrain data (one or more) in a rendered
// scene
vtkCellPicker *CellPicker;
vtkPolyDataCollection *Polys;
vtkPolygonalSurfacePointPlacerInternals *Internals;
double DistanceOffset;
vtkPolygonalSurfacePointPlacer(const vtkPolygonalSurfacePointPlacer&); //Not implemented
void operator=(const vtkPolygonalSurfacePointPlacer&); //Not implemented