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/*=========================================================================
Program: Visualization Toolkit
Module: vtkQuad.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 vtkQuad
* @brief a cell that represents a 2D quadrilateral
*
* vtkQuad is a concrete implementation of vtkCell to represent a 2D
* quadrilateral. vtkQuad is defined by the four points (0,1,2,3) in
* counterclockwise order. vtkQuad uses the standard isoparametric
* interpolation functions for a linear quadrilateral.
*/
#ifndef vtkQuad_h
#define vtkQuad_h
#include "vtkCell.h"
#include "vtkCommonDataModelModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
class vtkLine;
class vtkTriangle;
class vtkIncrementalPointLocator;
class VTKCOMMONDATAMODEL_EXPORT vtkQuad : public vtkCell
{
public:
static vtkQuad* New();
vtkTypeMacro(vtkQuad, vtkCell);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@{
/**
* See the vtkCell API for descriptions of these methods.
*/
int GetCellType() override { return VTK_QUAD; }
int GetCellDimension() override { return 2; }
int GetNumberOfEdges() override { return 4; }
int GetNumberOfFaces() override { return 0; }
vtkCell* GetEdge(int edgeId) override;
vtkCell* GetFace(int) override { return nullptr; }
int CellBoundary(int subId, const double pcoords[3], vtkIdList* pts) override;
void Contour(double value, vtkDataArray* cellScalars, vtkIncrementalPointLocator* locator,
vtkCellArray* verts, vtkCellArray* lines, vtkCellArray* polys, vtkPointData* inPd,
vtkPointData* outPd, vtkCellData* inCd, vtkIdType cellId, vtkCellData* outCd) override;
int EvaluatePosition(const double x[3], double closestPoint[3], int& subId, double pcoords[3],
double& dist2, double weights[]) override;
void EvaluateLocation(int& subId, const double pcoords[3], double x[3], double* weights) override;
int IntersectWithLine(const double p1[3], const double p2[3], double tol, double& t, double x[3],
double pcoords[3], int& subId) override;
int Triangulate(int index, vtkIdList* ptIds, vtkPoints* pts) override;
void Derivatives(
int subId, const double pcoords[3], const double* values, int dim, double* derivs) override;
double* GetParametricCoords() override;
///@}
/**
* Return the center of the triangle in parametric coordinates.
*/
int GetParametricCenter(double pcoords[3]) override;
/**
* Clip this quad using scalar value provided. Like contouring, except
* that it cuts the quad to produce other quads and/or triangles.
*/
void Clip(double value, vtkDataArray* cellScalars, vtkIncrementalPointLocator* locator,
vtkCellArray* polys, vtkPointData* inPd, vtkPointData* outPd, vtkCellData* inCd,
vtkIdType cellId, vtkCellData* outCd, int insideOut) override;
static void InterpolationFunctions(const double pcoords[3], double sf[4]);
static void InterpolationDerivs(const double pcoords[3], double derivs[8]);
///@{
/**
* Compute the interpolation functions/derivatives
* (aka shape functions/derivatives)
*/
void InterpolateFunctions(const double pcoords[3], double sf[4]) override
{
vtkQuad::InterpolationFunctions(pcoords, sf);
}
void InterpolateDerivs(const double pcoords[3], double derivs[8]) override
{
vtkQuad::InterpolationDerivs(pcoords, derivs);
}
///@}
/**
* Return the ids of the vertices defining edge (`edgeId`).
* Ids are related to the cell, not to the dataset.
*
* @note The return type changed. It used to be int*, it is now const vtkIdType*.
* This is so ids are unified between vtkCell and vtkPoints, and so vtkCell ids
* can be used as inputs in algorithms such as vtkPolygon::ComputeNormal.
*/
const vtkIdType* GetEdgeArray(vtkIdType edgeId);
protected:
vtkQuad();
~vtkQuad() override;
vtkLine* Line;
vtkTriangle* Triangle;
private:
vtkQuad(const vtkQuad&) = delete;
void operator=(const vtkQuad&) = delete;
};
//----------------------------------------------------------------------------
inline int vtkQuad::GetParametricCenter(double pcoords[3])
{
pcoords[0] = pcoords[1] = 0.5;
pcoords[2] = 0.0;
return 0;
}
VTK_ABI_NAMESPACE_END
#endif
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