perimeter_type(3G)

NAME

perimeter_type, bf_perimeter_type − select line type for subsequent polygon perimeters and backfacing polygon perimeters

SYNOPSIS

C Syntax:

void perimeter_type(fildes,style);
int fildes,style;

void bf_perimeter_type(fildes,style);
int fildes,style;

FORTRAN77 Syntax:

subroutine perimeter_type(fildes,style)
integer∗4 fildes,style

subroutine bf_perimeter_type(fildes,style)
integer∗4 fildes,style

Pascal Syntax:

procedure perimeter_type(fildes,style:integer);

procedure bf_perimeter_type(fildes,style:integer);

DESCRIPTION

Input Parameters

fildes Integer file descriptor returned by gopen when an I/O path to a graphics device is opened.

style One of the following:

SOLID
DASH
DOT
DASH_DOT
DASH_DOT_DOT
LONG_DASH
CENTER_DASH
CENTER_DASH_DASH

Discussion

The following perimeter types, and backfacing perimeter types, are pre-defined:

Index	Name	Approximate Pattern

0	SOLID	Solid
1	DASH	.25 .50 .25
2	DOT	4-8 dots per repeat length
3	DASH_DOT	.4 .1 dot .1 .35
4	DASH_DOT_DOT	.35 .1 dot .1 dot .1 .35
5	LONG_DASH	.375 .25 .375
6	CENTER_DASH	.35 .1 .1 .1 .35
7	CENTER_DASH_DASH	.25 .1 .1 .1 .1 .1 .25

Frontfacing polygon edges use the perimeter type specified by perimeter_type. Backfacing polygon edges use the perimeter type specified by bf_perimeter_type after bf_control has been called with attr parameter set to TRUE(1).

Negative style values are device-dependent. For example, −1 is a point plot on a terminal.

Continuity between separate but graphically connected polyline or line segments is not guaranteed.

The pattern is restarted each time this procedure is executed.

Some devices do not support this procedure.

DEFAULTS

Solid Lines.

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