line_filter(3G)

NAME

line_filter − select an anti-aliasing filter type for line primitives
perimeter_filter − select an anti-aliasing filter type for polygon primitives

SYNOPSIS

C Syntax:

void line_filter(fildes,index);
int fildes, index;

void perimeter_filter(fildes,index);
int fildes, index;

FORTRAN77 Syntax:

subroutine line_filter(fildes,index)
integer*4 fildes, index

subroutine perimeter_filter(fildes,index)
integer*4 fildes, index

Pascal Syntax:

procedure line_filter(fildes,index:integer);

procedure perimeter_filter(fildes,index:integer);

DESCRIPTION

Input Parameters

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

index Selects one filter from of a set of predefined filters.

Discussion

These procedures select an anti-aliasing filter to be used on subsequent line drawing or filled primitive perimeters. In addition, when the interior_style is set to INT_OUTLINE the current_perimeter_filter is applied. Index zero (0) is used by all devices to turn off anti-aliasing. The other indices are device dependent and listed in the Starbase Device Drivers Library Manual.

DEFAULTS

Index = 0, no filtering.

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