.TH blink 3 "R1c" "Silicon Graphics"
.SH NAME
.I blink
-  change the color map entry at a selectable rate
.SH SYNOPSIS
.nf
.TP \w'FORTRAN\ \ \ 'u
C
.B "blink(rate, color, red, green, blue) "
.B "short rate; "
.B "Colorindex color; "
.B "RGBvalue red, green, blue;"
.IP 
.TP \w'FORTRAN\ \ \ 'u
FORTRAN
.B "subroutine blink(rate, color, red, green, blue)"
.B "integer*2 rate, color, red, green, blue"
.IP 
.TP \w'FORTRAN\ \ \ 'u
Pascal
.B "procedure blink(rate: Short; color: Colorindex; red, green, blue: RGBvalue);"
.sp
.SH DESCRIPTION
.I Blink
specifies a blink rate, a color map index, and
red, green, and blue values.  Every \f3rate\f1 vertical retraces, the
color located at index \f3color\f1 in the current colormap is updated.
Its value is either the original value or the new value
supplied by the \f3red\f1, \f3green\f1, and \f3blue\f1 arguments. 
.PP
Up to twenty colors can blink simultaneously, each at a different
rate.  The blink rate can be changed by calling
.I blink
again with the same 
.B color
and a different
.B rate.
Calling \f2blink\f1 with
\f3rate\f1=0 when
\f3color\f1 specifies a blinking colormap
entry terminates the blinking and restores
the original color.
.SH "SEE ALSO"
.I mapcolor, color
.SH NOTE
This command can only be used in immediate mode.