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/*=========================================================================
Program: Visualization Toolkit
Module: vtkLine.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 vtkLine - cell represents a 1D line
// .SECTION Description
// vtkLine is a concrete implementation of vtkCell to represent a 1D line.
#ifndef __vtkLine_h
#define __vtkLine_h
#include "vtkCell.h"
class vtkIncrementalPointLocator;
class VTK_FILTERING_EXPORT vtkLine : public vtkCell
{
public:
static vtkLine *New();
vtkTypeMacro(vtkLine,vtkCell);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// See the vtkCell API for descriptions of these methods.
int GetCellType() {return VTK_LINE;};
int GetCellDimension() {return 1;};
int GetNumberOfEdges() {return 0;};
int GetNumberOfFaces() {return 0;};
vtkCell *GetEdge(int) {return 0;};
vtkCell *GetFace(int) {return 0;};
int CellBoundary(int subId, double pcoords[3], vtkIdList *pts);
void Contour(double value, vtkDataArray *cellScalars,
vtkIncrementalPointLocator *locator, vtkCellArray *verts,
vtkCellArray *lines, vtkCellArray *polys,
vtkPointData *inPd, vtkPointData *outPd,
vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd);
int EvaluatePosition(double x[3], double* closestPoint,
int& subId, double pcoords[3],
double& dist2, double *weights);
void EvaluateLocation(int& subId, double pcoords[3], double x[3],
double *weights);
int Triangulate(int index, vtkIdList *ptIds, vtkPoints *pts);
void Derivatives(int subId, double pcoords[3], double *values,
int dim, double *derivs);
virtual double *GetParametricCoords();
// Description:
// Clip this line using scalar value provided. Like contouring, except
// that it cuts the line to produce other lines.
void Clip(double value, vtkDataArray *cellScalars,
vtkIncrementalPointLocator *locator, vtkCellArray *lines,
vtkPointData *inPd, vtkPointData *outPd,
vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd,
int insideOut);
// Description:
// Return the center of the triangle in parametric coordinates.
int GetParametricCenter(double pcoords[3]);
// Description:
// Line-line intersection. Intersection has to occur within [0,1] parametric
// coordinates and with specified tolerance.
int IntersectWithLine(double p1[3], double p2[3], double tol, double& t,
double x[3], double pcoords[3], int& subId);
// Description:
// Performs intersection of two finite 3D lines. An intersection is found if
// the projection of the two lines onto the plane perpendicular to the cross
// product of the two lines intersect. The parameters (u,v) are the
// parametric coordinates of the lines at the position of closest approach.
static int Intersection(double p1[3], double p2[3],
double x1[3], double x2[3],
double& u, double& v);
// Description:
// Compute the distance of a point x to a finite line (p1,p2). The method
// computes the parametric coordinate t and the point location on the
// line. Note that t is unconstrained (i.e., it may lie outside the range
// [0,1]) but the closest point will lie within the finite line
// [p1,p2]. Also, the method returns the distance squared between x and the
// line (p1,p2).
static double DistanceToLine(double x[3], double p1[3], double p2[3],
double &t, double closestPoint[3]);
// Description:
// Determine the distance of the current vertex to the edge defined by
// the vertices provided. Returns distance squared. Note: line is assumed
// infinite in extent.
static double DistanceToLine(double x[3], double p1[3], double p2[3]);
// Description:
// Computes the shortest distance squared between two infinite lines, each
// defined by a pair of points (l0,l1) and (m0,m1).
// Upon return, the closest points on the two line segments will be stored
// in closestPt1 and closestPt2. Their parametric coords
// (-inf <= t0, t1 <= inf) will be stored in t0 and t1. The return value is
// the shortest distance squared between the two line-segments.
static double DistanceBetweenLines(
double l0[3], double l1[3],
double m0[3], double m1[3],
double closestPt1[3], double closestPt2[3],
double &t1, double &t2 );
// Description:
// Computes the shortest distance squared between two finite line segments
// defined by their end points (l0,l1) and (m0,m1).
// Upon return, the closest points on the two line segments will be stored
// in closestPt1 and closestPt2. Their parametric coords (0 <= t0, t1 <= 1)
// will be stored in t0 and t1. The return value is the shortest distance
// squared between the two line-segments.
static double DistanceBetweenLineSegments(
double l0[3], double l1[3],
double m0[3], double m1[3],
double closestPt1[3], double closestPt2[3],
double &t1, double &t2 );
// Description:
// @deprecated Replaced by vtkLine::InterpolateFunctions as of VTK 5.2
static void InterpolationFunctions(double pcoords[3], double weights[2]);
// Description:
// @deprecated Replaced by vtkLine::InterpolateDerivs as of VTK 5.2
static void InterpolationDerivs(double pcoords[3], double derivs[2]);
// Description:
// Compute the interpolation functions/derivatives
// (aka shape functions/derivatives)
virtual void InterpolateFunctions(double pcoords[3], double weights[2])
{
vtkLine::InterpolationFunctions(pcoords,weights);
}
virtual void InterpolateDerivs(double pcoords[3], double derivs[2])
{
vtkLine::InterpolationDerivs(pcoords,derivs);
}
protected:
vtkLine();
~vtkLine() {};
private:
vtkLine(const vtkLine&); // Not implemented.
void operator=(const vtkLine&); // Not implemented.
};
//----------------------------------------------------------------------------
inline int vtkLine::GetParametricCenter(double pcoords[3])
{
pcoords[0] = 0.5;
pcoords[1] = pcoords[2] = 0.0;
return 0;
}
#endif
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