Imported healpix tree

2025-07-05 07:41:11 +00:00 · 2012-10-30 13:56:48 -04:00 · 2012-10-30 13:56:48 -04:00 · 4bfb62f177
commit 4bfb62f177
parent 4182c30485
136 changed files with 26534 additions and 0 deletions
--- a/external/healpix/cxxsupport/pointing.h
+++ b/external/healpix/cxxsupport/pointing.h
@ -0,0 +1,106 @@
+/*
+ *  This file is part of libcxxsupport.
+ *
+ *  libcxxsupport 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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  libcxxsupport 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 libcxxsupport; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/*
+ *  libcxxsupport is being developed at the Max-Planck-Institut fuer Astrophysik
+ *  and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
+ *  (DLR).
+ */
+
+/*! \file pointing.h
+ *  Class representing a direction in 3D space
+ *
+ *  Copyright (C) 2003-2010 Max-Planck-Society
+ *  \author Martin Reinecke
+ */
+
+#ifndef PLANCK_POINTING_H
+#define PLANCK_POINTING_H
+
+#include <cmath>
+#include "vec3.h"
+#include "cxxutils.h"
+
+/*! \defgroup pointinggroup Pointings */
+/*! \{ */
+
+/*! Class representing a direction in 3D space or a location on the
+    unit sphere. All angles in radians. */
+class pointing
+  {
+  public:
+    /*! Colatitude of the pointing (i.e. the North pole is at \a theta=0). */
+    double theta;
+    /*! Longitude of the pointing. */
+    double phi;
+
+    /*! Default constructor. \a theta and \a phi are not initialized. */
+    pointing() {}
+    /*! Creates a pointing with \a Theta and \a Phi. */
+    pointing (double Theta, double Phi) : theta(Theta), phi(Phi) {}
+
+// FIXME: should become "explicit" some time
+    /*! Creates a pointing from the vector \a inp. \a inp need not be
+        normalized. */
+    pointing (const vec3 &inp)
+      { from_vec3(inp); }
+// FIXME: should be removed some time
+    /*! Returns a normalized vector pointing in the same direction. */
+    operator vec3() const
+      { return to_vec3(); }
+    /*! Returns a normalized vector pointing in the same direction. */
+    vec3 to_vec3() const
+      {
+      double st=sin(theta);
+      return vec3 (st*cos(phi), st*sin(phi), cos(theta));
+      }
+    /*! Converts \a inp to \a ptg. \a inp need not be normalized. */
+    void from_vec3 (const vec3 &inp)
+      {
+      using namespace std;
+      const double twopi_=6.283185307179586476925286766559005768394;
+      theta = atan2(sqrt(inp.x*inp.x+inp.y*inp.y),inp.z);
+      phi = safe_atan2 (inp.y,inp.x);
+      if (phi<0.) phi += twopi_;
+      }
+    /*! Changes the angles so that \a 0<=theta<=pi and \a 0<=phi<2*pi. */
+    void normalize()
+      {
+      const double pi_=3.141592653589793238462643383279502884197;
+      const double twopi_=6.283185307179586476925286766559005768394;
+      theta=fmodulo(theta,twopi_);
+      if (theta>pi_)
+        {
+        phi+=pi_;
+        theta=twopi_-theta;
+        }
+      phi=fmodulo(phi,twopi_);
+      }
+  };
+
+/*! Writes \a p to \a os.
+    \relates pointing */
+inline std::ostream &operator<< (std::ostream &os, const pointing &p)
+  {
+  os << p.theta << ", " << p.phi << std::endl;
+  return os;
+  }
+
+/*! \} */
+
+#endif