.TH GRAPHADD 3 "9 September 1992"
.SH NAME
v_print2, v_print3, m_print2, m_print3, v_scan2, v_scan3,  v_inters2, v_dupl2, v_dupl3, m_dupl2,  m_dupl3 \- additional 3d graphics and associated matrix and vector routines
.nf
.SH SYNOPSIS
.nf
.B #include <graphadd.h>
.LP
.B void		v_print2(hvec2_t vec, const char *name)

.B void		v_print3(hvec3_t vec, const char *name)

.B void		m_print2(hmat2_t mat, const char *name)

.B void		m_print3(hmat3_t mat, const char *name)

.B int          v_scan2(hvec2_t &vec)

.B int          v_scan3(hvec3_t &vec)

.B int v_inters2( 
const hvec2_t &p1, const hvec2_t &p2, const hvec2_t &q1, 
const hvec2_t &q2, hvec2_t *S1, hvec2_t *S2)

.B void    v_dupl2(hvec2_t *, hvec2_t *)

.B void    v_dupl3(hvec3_t *, hvec3_t *)

.B void    m_dupl2(hmat2_t *, hmat2_t *)

.B void    m_dupl3(hmat3_t *, hmat3_t *)

.SH DESCRIPTION
These routines ar an addition to grapmat(3). The *print routines print
the appropriate data to 
.I stderr. 
The *scan routines read from
.I stdin.
The *dupl routines copy data. v_inters2 returns the intersection point
of p1,p2 and q1,q2 in S1 and S2. The return value is 0 if no intersection
point is found, 1 if there is an intersection point, and two if the
two lines do overlap. In that case, the two points are the extrema.

.SH NAMES
Naming conventions as in graphmat(3).

.SH USAGE
All the "functions" may have been implemented as macro's, so you can't
take the address of a function. It is however guaranteed that arguments 
of each function/macro will be evaluated only once, except for the result
argument, which can be evaluated multiple times.

.SH SEE ALSO
graphmat(3), graphmat++(3), Graphics and matrix routines.

.SH NOTE
Only available in C++ and ANSI C. v_inters2 only in C++.
Library file is
.B /usr/local/lib/libgraphmat.a
and the C++ util files.

.SH AUTHOR
Herbert Hilhorst
.br
Klamer Schutte