1 /*=========================================================================
2
3 Program: Visualization Toolkit
4 Module: vtkQuad.h
5
6 Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
7 All rights reserved.
8 See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
9
10 This software is distributed WITHOUT ANY WARRANTY; without even
11 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
12 PURPOSE. See the above copyright notice for more information.
13
14 =========================================================================*/
15 // .NAME vtkQuad - a cell that represents a 2D quadrilateral
16 // .SECTION Description
17 // vtkQuad is a concrete implementation of vtkCell to represent a 2D
18 // quadrilateral. vtkQuad is defined by the four points (0,1,2,3) in
19 // counterclockwise order. vtkQuad uses the standard isoparametric
20 // interpolation functions for a linear quadrilateral.
21
22 #ifndef vtkQuad_h
23 #define vtkQuad_h
24
25 #include "vtkCommonDataModelModule.h" // For export macro
26 #include "vtkCell.h"
27
28 class vtkLine;
29 class vtkTriangle;
30 class vtkIncrementalPointLocator;
31
32 class VTKCOMMONDATAMODEL_EXPORT vtkQuad : public vtkCell
33 {
34 public:
35 static vtkQuad *New();
36 vtkTypeMacro(vtkQuad,vtkCell);
37 void PrintSelf(ostream& os, vtkIndent indent);
38
39 // Description:
40 // See the vtkCell API for descriptions of these methods.
GetCellType()41 int GetCellType() {return VTK_QUAD;};
GetCellDimension()42 int GetCellDimension() {return 2;};
GetNumberOfEdges()43 int GetNumberOfEdges() {return 4;};
GetNumberOfFaces()44 int GetNumberOfFaces() {return 0;};
45 vtkCell *GetEdge(int edgeId);
GetFace(int)46 vtkCell *GetFace(int) {return 0;};
47 int CellBoundary(int subId, double pcoords[3], vtkIdList *pts);
48 void Contour(double value, vtkDataArray *cellScalars,
49 vtkIncrementalPointLocator *locator, vtkCellArray *verts,
50 vtkCellArray *lines, vtkCellArray *polys,
51 vtkPointData *inPd, vtkPointData *outPd,
52 vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd);
53 int EvaluatePosition(double x[3], double* closestPoint,
54 int& subId, double pcoords[3],
55 double& dist2, double *weights);
56 void EvaluateLocation(int& subId, double pcoords[3], double x[3],
57 double *weights);
58 int IntersectWithLine(double p1[3], double p2[3], double tol, double& t,
59 double x[3], double pcoords[3], int& subId);
60 int Triangulate(int index, vtkIdList *ptIds, vtkPoints *pts);
61 void Derivatives(int subId, double pcoords[3], double *values,
62 int dim, double *derivs);
63 virtual double *GetParametricCoords();
64
65 // Description:
66 // Return the center of the triangle in parametric coordinates.
67 int GetParametricCenter(double pcoords[3]);
68
69 // Description:
70 // Clip this quad using scalar value provided. Like contouring, except
71 // that it cuts the quad to produce other quads and/or triangles.
72 void Clip(double value, vtkDataArray *cellScalars,
73 vtkIncrementalPointLocator *locator, vtkCellArray *polys,
74 vtkPointData *inPd, vtkPointData *outPd,
75 vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd,
76 int insideOut);
77
78 // Description:
79 // @deprecated Replaced by vtkQuad::InterpolateFunctions as of VTK 5.2
80 static void InterpolationFunctions(double pcoords[3], double sf[4]);
81 // Description:
82 // @deprecated Replaced by vtkQuad::InterpolateDerivs as of VTK 5.2
83 static void InterpolationDerivs(double pcoords[3], double derivs[8]);
84 // Description:
85 // Compute the interpolation functions/derivatives
86 // (aka shape functions/derivatives)
InterpolateFunctions(double pcoords[3],double sf[4])87 virtual void InterpolateFunctions(double pcoords[3], double sf[4])
88 {
89 vtkQuad::InterpolationFunctions(pcoords,sf);
90 }
InterpolateDerivs(double pcoords[3],double derivs[8])91 virtual void InterpolateDerivs(double pcoords[3], double derivs[8])
92 {
93 vtkQuad::InterpolationDerivs(pcoords,derivs);
94 }
95
96 // Description:
97 // Return the ids of the vertices defining edge (`edgeId`).
98 // Ids are related to the cell, not to the dataset.
99 int *GetEdgeArray(int edgeId);
100
101 protected:
102 vtkQuad();
103 ~vtkQuad();
104
105 vtkLine *Line;
106 vtkTriangle *Triangle;
107
108 private:
109 vtkQuad(const vtkQuad&); // Not implemented.
110 void operator=(const vtkQuad&); // Not implemented.
111 };
112 //----------------------------------------------------------------------------
GetParametricCenter(double pcoords[3])113 inline int vtkQuad::GetParametricCenter(double pcoords[3])
114 {
115 pcoords[0] = pcoords[1] = 0.5;
116 pcoords[2] = 0.0;
117 return 0;
118 }
119
120
121 #endif
122
123
124