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/*=============================================================================
Program: Visualization Toolkit
Module: vtkGeoMath.cxx
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.
=============================================================================*/
/*-------------------------------------------------------------------------
Copyright 2008 Sandia Corporation.
Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#include "vtkObjectFactory.h"
#include "vtkGeoMath.h"
#include "vtkMath.h"
vtkStandardNewMacro(vtkGeoMath);
//----------------------------------------------------------------------------
vtkGeoMath::vtkGeoMath()
{
}
//-----------------------------------------------------------------------------
vtkGeoMath::~vtkGeoMath()
{
}
//-----------------------------------------------------------------------------
void vtkGeoMath::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}
//-----------------------------------------------------------------------------
double vtkGeoMath::DistanceSquared(double pt0[3], double pt1[3])
{
double tmp;
double d2;
tmp = pt1[0] - pt0[0];
d2 = tmp * tmp;
tmp = pt1[1] - pt0[1];
d2 += tmp * tmp;
tmp = pt1[2] - pt0[2];
d2 += tmp * tmp;
return d2;
}
//-----------------------------------------------------------------------------
void vtkGeoMath::LongLatAltToRect(double longLatAlt[3], double rect[3])
{
double theta = vtkMath::RadiansFromDegrees( longLatAlt[0] );
double phi = vtkMath::RadiansFromDegrees( longLatAlt[1] );
double cosPhi = cos(phi);
double radius = vtkGeoMath::EarthRadiusMeters()+ longLatAlt[2];
rect[2] = sin(phi) * radius;
rect[1] = cos(theta) * cosPhi * radius;
rect[0] = -sin(theta) * cosPhi * radius;
}
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