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/*=========================================================================
Program: Visualization Toolkit
Module: vtkNonLinearCell.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 vtkNonLinearCell - abstract superclass for non-linear cells
// .SECTION Description
// vtkNonLinearCell is an abstract superclass for non-linear cell types.
// Cells that are a direct subclass of vtkCell or vtkCell3D are linear;
// cells that are a subclass of vtkNonLinearCell have non-linear interpolation
// functions. Non-linear cells require special treatment when tessellating
// or converting to graphics primitives. Note that the linearity of the cell
// is a function of whether the cell needs tessellation, which does not
// strictly correlate with interpolation order (e.g., vtkHexahedron has
// non-linear interpolation functions (a product of three linear functions
// in r-s-t) even thought vtkHexahedron is considered linear.)
#ifndef __vtkNonLinearCell_h
#define __vtkNonLinearCell_h
#include "vtkCell.h"
class VTK_FILTERING_EXPORT vtkNonLinearCell : public vtkCell
{
public:
vtkTypeMacro(vtkNonLinearCell,vtkCell);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Non-linear cells require special treatment (tessellation) when
// converting to graphics primitives (during mapping). The vtkCell
// API IsLinear() is modified to indicate this requirement.
virtual int IsLinear() {return 0;}
protected:
vtkNonLinearCell();
~vtkNonLinearCell() {}
private:
vtkNonLinearCell(const vtkNonLinearCell&); // Not implemented.
void operator=(const vtkNonLinearCell&); // Not implemented.
};
#endif
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