libs/pbd/pbd/cartesian.h

   1 /*
   2     Copyright (C) 2010 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #ifndef __libpbd_cartesian_h__
  20 #define __libpbd_cartesian_h__
  21
  22 #include <cfloat>
  23 #include <cmath>
  24
  25 namespace PBD {
  26
  27 void spherical_to_cartesian (double azi, double ele, double len, double& x, double& y, double& z);
  28 void cartesian_to_spherical (double x, double y, double z, double& azi, double& ele, double& len);
  29
  30 struct AngularVector;
  31
  32 struct CartesianVector {
  33         double x;
  34         double y;
  35         double z;
  36
  37         CartesianVector () : x(0.0), y(0.0), z(0.0) {}
  38         CartesianVector (double xp, double yp, double zp = 0.0) : x(xp), y(yp), z(zp) {}
  39
  40         CartesianVector& translate (CartesianVector& other, double xtranslate, double ytranslate, double ztranslate = 0.0) {
  41                 other.x += xtranslate;
  42                 other.y += ytranslate;
  43                 other.z += ztranslate;
  44                 return other;
  45         }
  46
  47         CartesianVector& scale (CartesianVector& other, double xscale, double yscale, double zscale = 1.0) {
  48                 other.x *= xscale;
  49                 other.y *= yscale;
  50                 other.z *= zscale;
  51                 return other;
  52         }
  53
  54         void angular (AngularVector&) const;
  55 };
  56
  57 struct AngularVector {
  58         double azi;
  59         double ele;
  60         double length;
  61
  62         AngularVector () : azi(0.0), ele(0.0), length (0.0) {}
  63         AngularVector (double a, double e, double l = 1.0) : azi(a), ele(e), length (l) {}
  64
  65         AngularVector operator- (const AngularVector& other) const {
  66                 AngularVector r;
  67                 r.azi = azi - other.azi;
  68                 r.ele = ele - other.ele;
  69                 r.length = length - other.length;
  70                 return r;
  71         }
  72
  73         AngularVector operator+ (const AngularVector& other) const {
  74                 AngularVector r;
  75                 r.azi = azi + other.azi;
  76                 r.ele = ele + other.ele;
  77                 r.length = length + other.length;
  78                 return r;
  79         }
  80
  81         bool operator== (const AngularVector& other) const {
  82                 return fabs (azi - other.azi) <= FLT_EPSILON &&
  83                 fabs (ele - other.ele) <= FLT_EPSILON &&
  84                 fabs (length - other.length) <= FLT_EPSILON;
  85         }
  86
  87         bool operator!= (const AngularVector& other) const {
  88                 return fabs (azi - other.azi) > FLT_EPSILON ||
  89                         fabs (ele - other.ele) > FLT_EPSILON ||
  90                         fabs (length - other.length) > FLT_EPSILON;
  91         }
  92
  93         void cartesian (CartesianVector& c) const {
  94                 spherical_to_cartesian (azi, ele, length, c.x, c.y, c.z);
  95         }
  96 };
  97
  98 inline void CartesianVector::angular (AngularVector& a) const {
  99         cartesian_to_spherical (x, y, z, a.azi, a.ele, a.length);
 100 }
 101
 102 }
 103
 104 #endif /* __libpbd_cartesian_h__ */