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/* RCSid $Id: fvect.h,v 2.14 2012/09/06 00:07:43 greg Exp $ */
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/*
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* Declarations for floating-point vector operations.
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*/
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#ifndef _RAD_FVECT_H_
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#define _RAD_FVECT_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef SMLFLT
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#define RREAL float
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#define FTINY (1e-3)
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#else
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#define RREAL double
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#define FTINY (1e-6)
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#endif
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#define FHUGE (1e10)
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typedef RREAL FVECT[3];
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#define VCOPY(v1,v2) ((v1)[0]=(v2)[0],(v1)[1]=(v2)[1],(v1)[2]=(v2)[2])
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#define DOT(v1,v2) ((v1)[0]*(v2)[0]+(v1)[1]*(v2)[1]+(v1)[2]*(v2)[2])
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#define VLEN(v) sqrt(DOT(v,v))
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#define VADD(vr,v1,v2) ((vr)[0]=(v1)[0]+(v2)[0], \
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(vr)[1]=(v1)[1]+(v2)[1], \
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(vr)[2]=(v1)[2]+(v2)[2])
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#define VSUB(vr,v1,v2) ((vr)[0]=(v1)[0]-(v2)[0], \
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(vr)[1]=(v1)[1]-(v2)[1], \
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(vr)[2]=(v1)[2]-(v2)[2])
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#define VSUM(vr,v1,v2,f) ((vr)[0]=(v1)[0]+(f)*(v2)[0], \
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(vr)[1]=(v1)[1]+(f)*(v2)[1], \
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(vr)[2]=(v1)[2]+(f)*(v2)[2])
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#define VCROSS(vr,v1,v2) \
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((vr)[0]=(v1)[1]*(v2)[2]-(v1)[2]*(v2)[1], \
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(vr)[1]=(v1)[2]*(v2)[0]-(v1)[0]*(v2)[2], \
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(vr)[2]=(v1)[0]*(v2)[1]-(v1)[1]*(v2)[0])
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#define GEOD_RAD 0 /* geodesic distance specified in radians */
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#define GEOD_ABS 1 /* absolute geodesic distance */
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#define GEOD_REL 2 /* relative geodesic distance */
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extern double Acos(double x);
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extern double Asin(double x);
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extern double fdot(const FVECT v1, const FVECT v2);
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extern double dist2(const FVECT v1, const FVECT v2);
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extern double dist2line(const FVECT p, const FVECT ep1, const FVECT ep2);
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extern double dist2lseg(const FVECT p, const FVECT ep1, const FVECT ep2);
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extern void fcross(FVECT vres, const FVECT v1, const FVECT v2);
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extern void fvsum(FVECT vres, const FVECT v0, const FVECT v1, double f);
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extern double normalize(FVECT v);
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extern int closestapproach(RREAL t[2],
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const FVECT rorg0, const FVECT rdir0,
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const FVECT rorg1, const FVECT rdir1);
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extern void spinvector(FVECT vres, const FVECT vorig,
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const FVECT vnorm, double theta);
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extern double geodesic(FVECT vres, const FVECT vorig,
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const FVECT vtarg, double t, int meas);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_FVECT_H_ */
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