ncl_line (3) - Linux Manuals

ncl_line: draws a line from the point (X1,Y1) to the point (X2,Y2).

NAME

LINE - draws a line from the point (X1,Y1) to the point (X2,Y2). The "pen" (for subsequent calls to FRSTPT, VECTOR, PLOTIF, and PLOTIT) is left at (X2,Y2).

SYNOPSIS

CALL LINE (X1,Y1,X2,Y2)

C-BINDING SYNOPSIS

#include <ncarg/ncargC.h>

void c_line (float x1, float y1, float x2, float y2)

DESCRIPTION

X1

(an input expression of type REAL) defines the X user coordinate of the starting point of a line segment.

Y1

(an input expression of type REAL) defines the Y user coordinate of the starting point of a line segment.

X2

(an input expression of type REAL) defines the X user coordinate of the ending point of a line segment.

Y2

(an input expression of type REAL) defines the Y user coordinate of the ending point of a line segment.

C-BINDING DESCRIPTION

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

USAGE

Polyline type, line width, and color can be set by calling the GKS routines GSLN, GSLWSC, GSCR, and GSPLCI before calling LINE.

This routine flushes the SPPS polyline buffer at each line draw. Thus, polyline attributes can be safely changed between successive calls.

EXAMPLES

Use the ncargex command to see the following relevant examples: mpex07, mpex09, cbex01, coex01, coex03, epltch, srex01, and tgflas.

ACCESS

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

COPYRIGHT

Copyright (C) 1987-2009
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.