# ncl_gpl man page

GPL (Polyline) — This output primitive draws line segments connecting a sequence of user-specified coordinate pairs.

## Synopsis

CALL GPL (N, X, Y)

## C-Binding Synopsis

#include <ncarg/gks.h>

void gpolyline(const Gpoint_list *point_list);

## Description

- N
- (Integer, Input) - The number of points in the line to be drawn. N must be larger than one.
- X (N)
- (Real Array, Input) - The X coordinates (specified in world coordinates) of the N points to be connected by line segments.
- Y (N)
- (Real Array, Input) - The Y coordinates (specified in world coordinates) of the N points to be connected by line segments.

## Usage

Note that the coordinate pairs must be in world coordinates and not user coordinates. Among other things, this means that the log scaling and mirror-imaging features available via the SET call and the SPPS functions for drawing lines are not applicable here.

## Access

To use GKS routines, load the NCAR GKS-0A library ncarg_gks.

## See Also

Online: gsln, gslwsc, gscr, gsplci, gqln, gqlwsc, gqplci, dashline, set, gpolyline

Hardcopy: User's Guide for NCAR GKS-0A Graphics; NCAR Graphics Fundamentals, UNIX Version "The Use of X/Y Coordinates in NCAR Graphics" SCD User Document"

## Copyright

Copyright (C) 1987-2009

University Corporation for Atmospheric Research

The use of this Software is governed by a License Agreement.