off-color-factor

Arguments: lamp

The value should be a real number between zero and one, inclusive. When the off-color property is nil, an effective off-color is computed by multiplying the red, green, and blue components of the on-color by this number. The default value is 0.5.

For example, suppose:

• off-color is nil
• off-color-factor has its initial value of 0.5
• on-color is white (red, green, and blue all 255)

Then the color displayed when the lamp is off is a medium gray (the result of (make-rgb :red 127 :blue 127 :green 127)) -- the red, green, and blue all (floor (* 255 0.5)) = 127).

See the description of the lamp control.

Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 9.0. This page was not revised from the 8.2 page.
Created 2012.5.30.