PrParamUtil.h

//===========================================================================
// GoTools - SINTEF Geometry Tools version 1.1
//
// GoTools module: parametrization
//
// Copyright (C) 2000-2005 SINTEF ICT, Applied Mathematics, Norway.
//
// This program is free software; you can redistribute it and/or          
// modify it under the terms of the GNU General Public License            
// as published by the Free Software Foundation version 2 of the License. 
//
// This program is distributed in the hope that it will be useful,        
// but WITHOUT ANY WARRANTY; without even the implied warranty of         
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          
// GNU General Public License for more details.                           
//
// You should have received a copy of the GNU General Public License      
// along with this program; if not, write to the Free Software            
// Foundation, Inc.,                                                      
// 59 Temple Place - Suite 330,                                           
// Boston, MA  02111-1307, USA.                                           
//
// Contact information: E-mail: tor.dokken@sintef.no                      
// SINTEF ICT, Department of Applied Mathematics,                         
// P.O. Box 124 Blindern,                                                 
// 0314 Oslo, Norway.                                                     
//
// Other licenses are also available for this software, notably licenses
// for:
// - Building commercial software.                                        
// - Building software whose source code you wish to keep private.        
//===========================================================================
#ifndef PRPARAMUTIL_H
#define PRPARAMUTIL_H

#include "Array.h"
using Go::Vector2D;
using Go::Vector3D;

void baryCoords(double x, double y, double x0, double y0, double x1, double y1,
                double x2, double y2, double& tau0, double& tau1, double& tau2);

//M.F. Feb 97.
void baryCoords0(double& u0, double& v0, double& u1, double& v1,
                 double& u2, double& v2, double& tau0, double& tau1, double& tau2);


double det(const double& u1, const double& v1,
           const double& u2, const double& v2);

double area(const double& x0, const double& y0,
            const double& x1, const double& y1,
            const double& x2, const double& y2);

double area(const Vector3D& a,
            const Vector3D& b,
            const Vector3D& c);

void polarCoords(Vector2D v, double& r, double& theta);

void polarCoords(double u, double v, double& r, double& theta);

//*  M.F. Apr. 2002.
double tanThetaOverTwo(const Vector3D& a,
                       const Vector3D& b,
                       const Vector3D& c);

double cotangent(const Vector3D& a, const Vector3D& b, const Vector3D& c);


#endif // PRPARAMUTIL_H

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