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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkNonLinearCell
* @brief abstract superclass for non-linear cells
*
* 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"
#include "vtkCommonDataModelModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
class VTKCOMMONDATAMODEL_EXPORT vtkNonLinearCell : public vtkCell
{
public:
vtkTypeMacro(vtkNonLinearCell, vtkCell);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Non-linear cells require special treatment (tessellation) when
* converting to graphics primitives (during mapping). The vtkCell
* API IsLinear() is modified to indicate this requirement.
*/
int IsLinear() VTK_FUTURE_CONST override { return 0; }
/**
* Clip the cell based on the input cellScalars and the
* specified value. The output of the clip operation will be one or
* more cells of the same topological dimension as the original cell.
* For more information see vtkCell::Clip.
*
* This method differs from the vtkCell::Clip function in such a way
* that it tells more information about how the clipped cell was
* handled. For 2D cells vtkCell::Clip is expected to return either
* triangles, quads or polygon, and for 3D cells either tetras or
* wedges. However, it is interesting (especially for non linear cells)
* to be able to return the same cell type when the cell is totally
* inside or outside the clipping function. This Clip function
* resolves exactly this issue by returning a bool : if StableClip
* returns true then the newly inserted cell is the same type as the
* current cell, otherwise it will be one of the "expected" types
* as returned by vtkCell::Clip.
*
* Note: This function could also benefit being moved to vtkCell but
* requires much more work to be supported by all cell types.
*
* @see vtkCell::Clip
*/
virtual bool StableClip(double value, vtkDataArray* cellScalars,
vtkIncrementalPointLocator* locator, vtkCellArray* connectivity, vtkPointData* inPd,
vtkPointData* outPd, vtkCellData* inCd, vtkIdType cellId, vtkCellData* outCd, int insideOut)
{
this->Clip(
value, cellScalars, locator, connectivity, inPd, outPd, inCd, cellId, outCd, insideOut);
return false;
}
protected:
vtkNonLinearCell();
~vtkNonLinearCell() override = default;
private:
vtkNonLinearCell(const vtkNonLinearCell&) = delete;
void operator=(const vtkNonLinearCell&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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