NAME

blink − changes a color map entry at a selectable rate

SPECIFICATION

C
blink(rate, i, red, green, blue)
short rate, red, green, blue;
Colorindex i;
short red, green, blue

FORTRAN
subroutine blink(rate, i, red, green, blue)
integer*4 rate, i, red, green, blue

Pascal
procedure blink(rate: Short: color: Colorindex;
red, green, blue: Short);

DESCRIPTION

blink specifies blink rate, color map index, and red, green, and blue values.  rate is measured in terms of vertical retraces.  The system updates the color located at index i in the current color map according to rate.  For example, if rate is 3, the color changes (blinks) every third vertical retrace.  Its value alternates between the original value and the new value supplied by red, green, and blue.  The length of time between retraces varies according to the monitor used.  On the standard 60Hz monitor, there are 60 retraces per second.  When using this monitor, a rate of 60 would cause the color to change once every second. 

Up to 20 colors can blink simultaneously, each at a different rate.  You can change the blink rate by calling blink with the same i and a different rate.  To terminate blinking and restore the original color when i specifies a blinking colormap entry, call blink with rate = 0.  To terminate all blinking colors simultaneously, call blink with rate=-1.  When you set rate to -1, the other parameters are ignored. 
 

SEE ALSO

mapcolor, color Programming Guide, Section 6.2, Color Maps

NOTE

This routine available only in immediate mode. 

Version 3.6  —  December 20, 1987