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/*=========================================================================
Program: Visualization Toolkit
Module: vtkLinearExtrusionFilter.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 vtkLinearExtrusionFilter - sweep polygonal data creating a "skirt" from free edges and lines, and lines from vertices
// .SECTION Description
// vtkLinearExtrusionFilter is a modeling filter. It takes polygonal data as
// input and generates polygonal data on output. The input dataset is swept
// according to some extrusion function and creates new polygonal primitives.
// These primitives form a "skirt" or swept surface. For example, sweeping a
// line results in a quadrilateral, and sweeping a triangle creates a "wedge".
//
// There are a number of control parameters for this filter. You can
// control whether the sweep of a 2D object (i.e., polygon or triangle strip)
// is capped with the generating geometry via the "Capping" ivar. Also, you
// can extrude in the direction of a user specified vector, towards a point,
// or in the direction of vertex normals (normals must be provided - use
// vtkPolyDataNormals if necessary). The amount of extrusion is controlled by
// the "ScaleFactor" instance variable.
//
// The skirt is generated by locating certain topological features. Free
// edges (edges of polygons or triangle strips only used by one polygon or
// triangle strips) generate surfaces. This is true also of lines or
// polylines. Vertices generate lines.
//
// This filter can be used to create 3D fonts, 3D irregular bar charts,
// or to model 2 1/2D objects like punched plates. It also can be used to
// create solid objects from 2D polygonal meshes.
// .SECTION Caveats
// Some polygonal objects have no free edges (e.g., sphere). When swept,
// this will result in two separate surfaces if capping is on, or no surface
// if capping is off.
// .SECTION See Also
// vtkRotationalExtrusionFilter
#ifndef __vtkLinearExtrusionFilter_h
#define __vtkLinearExtrusionFilter_h
#include "vtkPolyDataAlgorithm.h"
class vtkDataArray;
#define VTK_VECTOR_EXTRUSION 1
#define VTK_NORMAL_EXTRUSION 2
#define VTK_POINT_EXTRUSION 3
class VTK_GRAPHICS_EXPORT vtkLinearExtrusionFilter : public vtkPolyDataAlgorithm
{
public:
vtkTypeMacro(vtkLinearExtrusionFilter,vtkPolyDataAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Create object with normal extrusion type, capping on, scale factor=1.0,
// vector (0,0,1), and extrusion point (0,0,0).
static vtkLinearExtrusionFilter *New();
// Description:
// Set/Get the type of extrusion.
vtkSetClampMacro(ExtrusionType,int,VTK_VECTOR_EXTRUSION,VTK_POINT_EXTRUSION);
vtkGetMacro(ExtrusionType,int);
void SetExtrusionTypeToVectorExtrusion()
{this->SetExtrusionType(VTK_VECTOR_EXTRUSION);};
void SetExtrusionTypeToNormalExtrusion()
{this->SetExtrusionType(VTK_NORMAL_EXTRUSION);};
void SetExtrusionTypeToPointExtrusion()
{this->SetExtrusionType(VTK_POINT_EXTRUSION);};
// Description:
// Turn on/off the capping of the skirt.
vtkSetMacro(Capping,int);
vtkGetMacro(Capping,int);
vtkBooleanMacro(Capping,int);
// Description:
// Set/Get extrusion scale factor,
vtkSetMacro(ScaleFactor,double);
vtkGetMacro(ScaleFactor,double);
// Description:
// Set/Get extrusion vector. Only needs to be set if VectorExtrusion is
// turned on.
vtkSetVector3Macro(Vector,double);
vtkGetVectorMacro(Vector,double,3);
// Description:
// Set/Get extrusion point. Only needs to be set if PointExtrusion is
// turned on. This is the point towards which extrusion occurs.
vtkSetVector3Macro(ExtrusionPoint,double);
vtkGetVectorMacro(ExtrusionPoint,double,3);
protected:
vtkLinearExtrusionFilter();
~vtkLinearExtrusionFilter() {};
virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
int ExtrusionType;
int Capping;
double ScaleFactor;
double Vector[3];
double ExtrusionPoint[3];
//BTX
void (vtkLinearExtrusionFilter::*ExtrudePoint)(double x[3], vtkIdType id,
vtkDataArray *normals);
void ViaNormal(double x[3], vtkIdType id, vtkDataArray *normals);
void ViaVector(double x[3], vtkIdType id, vtkDataArray *normals=0);
void ViaPoint(double x[3], vtkIdType id, vtkDataArray *normals=0);
//ETX
private:
vtkLinearExtrusionFilter(const vtkLinearExtrusionFilter&); // Not implemented.
void operator=(const vtkLinearExtrusionFilter&); // Not implemented.
};
#endif
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