ncl_line3 man page

LINE3 — Draws the straight-line segment joining the projections of two points in 3-space.

Synopsis

CALL LINE3 (UA,VA,WA,UB,VB,WB)

C-Binding Synopsis

#include <ncarg/ncargC.h>

void c_line3 (float ua, float va, float wa, float ub,
float vb, float wb)

Description

UA,VA,WA
(input expressions of type REAL) are the coordinates of the first point in 3-space.
UB,VB,WB
(input expressions of type REAL) are the coordinates of the second point in 3-space.

The statement "CALL LINE3 (UA,VA,WA,UB,VB,WB)" is equivalent to the three statements "CALL FRST3 (UA,VA,WA)", "CALL VECT3 (UB,VB,,WB)", and "CALL PLOTIF (0.,0.,2), but is slightly more efficient. To approximate a curve defined by three or more points, though, it is not efficient to use LINE3, because the first point of each line segment after the first will be a repeat of the second point of the previous line segment and will therefore be repeated in the metafile. Thus, to approximate a curve, you should use FRST3 and VECT3 or CURVE3.

Straight-line segments drawn by LINE3 are drawn in the current polyline color, as determined by the last call to the GKS routine GSPLCI; by default, color index 1 is used. Line width is determined by the last call to the GKS routine GSLWSC; by default, the line width scale factor is 1.

C-Binding Description

The C-binding argument descriptions are the same as the FORTRAN argument descriptions.

Examples

Use the ncargex command to see the following relevant example: tpwrzt, fthex02.

Access

To use LINE3 or c_line3, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.

See Also

Online: threed, curve3, fence3, frst3, perim3, point3, psym3, pwrz, pwrzt, set3, threed, tick3, tick43, vect3, ncarg_cbind.

Hardcopy: NCAR Graphics Fundamentals, UNIX Version

Info

March 1993 UNIX NCAR GRAPHICS