138 lines
4.9 KiB
C++
138 lines
4.9 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkPixel.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkPixel
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* @brief a cell that represents an orthogonal quadrilateral
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*
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* vtkPixel is a concrete implementation of vtkCell to represent a 2D
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* orthogonal quadrilateral. Unlike vtkQuad, the corners are at right angles,
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* and aligned along x-y-z coordinate axes leading to large increases in
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* computational efficiency.
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*/
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#ifndef vtkPixel_h
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#define vtkPixel_h
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#include "vtkCell.h"
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#include "vtkCommonDataModelModule.h" // For export macro
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class vtkLine;
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class vtkIncrementalPointLocator;
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class VTKCOMMONDATAMODEL_EXPORT vtkPixel : public vtkCell
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{
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public:
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static vtkPixel* New();
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vtkTypeMacro(vtkPixel, vtkCell);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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///@{
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/**
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* See the vtkCell API for descriptions of these methods.
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*/
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int GetCellType() override { return VTK_PIXEL; }
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int GetCellDimension() override { return 2; }
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int GetNumberOfEdges() override { return 4; }
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int GetNumberOfFaces() override { return 0; }
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vtkCell* GetEdge(int edgeId) override;
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vtkCell* GetFace(int) override { return nullptr; }
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int CellBoundary(int subId, const double pcoords[3], vtkIdList* pts) override;
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void Contour(double value, vtkDataArray* cellScalars, vtkIncrementalPointLocator* locator,
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vtkCellArray* verts, vtkCellArray* lines, vtkCellArray* polys, vtkPointData* inPd,
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vtkPointData* outPd, vtkCellData* inCd, vtkIdType cellId, vtkCellData* outCd) override;
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void Clip(double value, vtkDataArray* cellScalars, vtkIncrementalPointLocator* locator,
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vtkCellArray* polys, vtkPointData* inPd, vtkPointData* outPd, vtkCellData* inCd,
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vtkIdType cellId, vtkCellData* outCd, int insideOut) override;
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int EvaluatePosition(const double x[3], double closestPoint[3], int& subId, double pcoords[3],
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double& dist2, double weights[]) override;
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void EvaluateLocation(int& subId, const double pcoords[3], double x[3], double* weights) override;
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///@}
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/**
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* Inflates this pixel by a distance of dist by moving the edges of the pixel
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* by that distance. Since a pixel lies in 3D, the degenerate case where the
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* pixel is homogeneous to a line are discarted because of normal direction
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* ambiguity. Hence, if you shrink a 2D pixel so it loses thickness in one
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* dimension. inflating it back to its previous form is impossible.
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*
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* A degenerate pixel of dimension 1 is inflated the same way a segment would be
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* inflated. A degenerate pixel of dimension 0 is untouched.
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*
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* \return 1
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*/
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int Inflate(double dist) override;
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/**
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* Computes exact bounding sphere of this pixel.
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*/
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double ComputeBoundingSphere(double center[3]) const override;
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/**
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* Return the center of the triangle in parametric coordinates.
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*/
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int GetParametricCenter(double pcoords[3]) override;
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int IntersectWithLine(const double p1[3], const double p2[3], double tol, double& t, double x[3],
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double pcoords[3], int& subId) override;
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int Triangulate(int index, vtkIdList* ptIds, vtkPoints* pts) override;
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void Derivatives(
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int subId, const double pcoords[3], const double* values, int dim, double* derivs) override;
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double* GetParametricCoords() override;
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static void InterpolationFunctions(const double pcoords[3], double weights[4]);
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static void InterpolationDerivs(const double pcoords[3], double derivs[8]);
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///@{
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/**
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* Compute the interpolation functions/derivatives
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* (aka shape functions/derivatives)
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*/
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void InterpolateFunctions(const double pcoords[3], double weights[4]) override
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{
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vtkPixel::InterpolationFunctions(pcoords, weights);
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}
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void InterpolateDerivs(const double pcoords[3], double derivs[8]) override
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{
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vtkPixel::InterpolationDerivs(pcoords, derivs);
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}
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///@}
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/**
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* vtkPixel's normal cannot be computed using vtkPolygon::ComputeNormal because
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* its points are not sorted such that circulating on them forms the pixel.
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* This is a convenient method so one can compute normals on a pixel.
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*/
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int ComputeNormal(double n[3]);
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protected:
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vtkPixel();
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~vtkPixel() override;
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vtkLine* Line;
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private:
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vtkPixel(const vtkPixel&) = delete;
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void operator=(const vtkPixel&) = delete;
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};
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//----------------------------------------------------------------------------
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inline int vtkPixel::GetParametricCenter(double pcoords[3])
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{
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pcoords[0] = pcoords[1] = 0.5;
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pcoords[2] = 0.0;
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return 0;
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}
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#endif
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