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/*
Copyright (C) 2003 by Andrew Lloyd Rohl
a.rohl@curtin.edu.au
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; either version 2
of the License, or (at your option) any later version.
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.
The GNU GPL can also be found at http://www.gnu.org
*/
/******************************************************************************
* vector.h
*
* Vector include file containing vector typedef and vector macros
******************************************************************************/
/* VECTOR definition */
typedef struct { gdouble element[3]; } vector;
#define V_E(V,e) ((V).element[e])
#define V_X(V) ((V).element[0])
#define V_Y(V) ((V).element[1])
#define V_Z(V) ((V).element[2])
#define V_X2(V) ((V).element[0] * (V).element[0])
#define V_Y2(V) ((V).element[1] * (V).element[1])
#define V_Z2(V) ((V).element[2] * (V).element[2])
#define V_INIT(A,B,C,D) { \
V_X(A) = B; \
V_Y(A) = C; \
V_Z(A) = D; \
}
#define V_EQUATE(A,B) { \
V_X(A) = V_X(B); \
V_Y(A) = V_Y(B); \
V_Z(A) = V_Z(B); \
}
#define V_SCALER(A,B,C) { \
V_X(A) = (float)(B) * V_X(C); \
V_Y(A) = (float)(B) * V_Y(C); \
V_Z(A) = (float)(B) * V_Z(C); \
}
#define V_ADD(A,b,B,c,C) { \
V_X(A) = (float)b * V_X(B) + (float)c * V_X(C); \
V_Y(A) = (float)b * V_Y(B) + (float)c * V_Y(C); \
V_Z(A) = (float)b * V_Z(B) + (float)c * V_Z(C); \
}
#define V_QADD(A,B,OP,C) { \
V_X(A) = V_X(B) OP V_X(C); \
V_Y(A) = V_Y(B) OP V_Y(C); \
V_Z(A) = V_Z(B) OP V_Z(C); \
}
#define V_0_ASSIGN(A,OP1) {\
V_X(A) OP1; \
V_Y(A) OP1; \
V_Z(A) OP1; \
}
#define V_1_ASSIGN(A,OP1,B) {\
V_X(A) OP1 V_X(B); \
V_Y(A) OP1 V_Y(B); \
V_Z(A) OP1 V_Z(B); \
}
#define V_ASSIGN(A,OP1,B,OP2,C) { \
V_X(A) OP1 V_X(B) OP2 V_X(C); \
V_Y(A) OP1 V_Y(B) OP2 V_Y(C); \
V_Z(A) OP1 V_Z(B) OP2 V_Z(C); \
}
#define V_2_ASSIGN(A,OP1,B,OP2,C) { \
V_X(A) OP1 V_X(B) OP2 V_X(C); \
V_Y(A) OP1 V_Y(B) OP2 V_Y(C); \
V_Z(A) OP1 V_Z(B) OP2 V_Z(C); \
}
#define V_3_ASSIGN(A,OP1,B,OP2,C,OP3,D) { \
V_X(A) OP1 V_X(B) OP2 V_X(C) OP3 V_X(D); \
V_Y(A) OP1 V_Y(B) OP2 V_Y(C) OP3 V_Y(D); \
V_Z(A) OP1 V_Z(B) OP2 V_Z(C) OP3 V_Z(D); \
}
#define V_MAGSQ(A) (V_X(A) * V_X(A) + V_Y(A) * V_Y(A) + V_Z(A) * V_Z(A))
#define V_MAG(A) (sqrt(V_MAGSQ(A)))
#define V2_MAGSQ(A) (V_X(A) * V_X(A) + V_Y(A) * V_Y(A))
#define V_DOT(A,B) (V_X(A) * V_X(B) + V_Y(A) * V_Y(B) + V_Z(A) * V_Z(B))
#define V_CROSS(A,B,C) { \
V_X(A) = V_Y(B) * V_Z(C) - V_Z(B) * V_Y(C); \
V_Y(A) = V_Z(B) * V_X(C) - V_X(B) * V_Z(C); \
V_Z(A) = V_X(B) * V_Y(C) - V_Y(B) * V_X(C); \
}
#define V_COSANG(A,B) (V_DOT(A,B) / sqrt(V_MAGSQ(A) * V_MAGSQ(B)))
#define V_ANG(A,B) (acos(V_DOT(A,B) / sqrt(V_MAGSQ(A) * V_MAGSQ(B))))
#define V_SEPARATION(A,B) (sqrt((V_X(A) - V_X(B)) * (V_X(A) - V_X(B)) \
+ (V_Y(A) - V_Y(B)) * (V_Y(A) - V_Y(B)) \
+ (V_Z(A) - V_Z(B)) * (V_Z(A) - V_Z(B))))
#define V_SEP_SQ(A,B) ((V_X(A) - V_X(B)) * (V_X(A) - V_X(B)) \
+ (V_Y(A) - V_Y(B)) * (V_Y(A) - V_Y(B)) \
+ (V_Z(A) - V_Z(B)) * (V_Z(A) - V_Z(B)))
#define V_ZERO(A) (V_X(A) = V_Y(A) = V_Z(A) = 0.0)
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