1cl-colors: a simple color library for Common Lisp

This is a very simple color library for Common Lisp, providing:

1. Types for representing colors in HSV and RGB spaces.
2. Simple conversion functions between the above types (and alsohexadecimal representation for RGB).
3. Some predefined colors as an association list of names and symbolswhich are bound to a corresponding RGB value.
   1. X11 color names as*x11-color-list*
   2. SVG basic color namesas *svg-colors-list*
   3. SVG extended color names as *svg-extended-colors-list*
   4. Example:

      
              '(("lightgreen"  . +LIGHTGREEN+)
                ("light-green" . +LIGHT-GREEN+)
                ("darkred"     . +DARKRED+)
               …
      
      

1.1Examples

(let ((color1 (hsv 107 62/100 52/100))  ; greenish
      (color2 (rgb 14/15 26/51 14/15))  ; = violet from X11
      (color3 (as-rgb "ff9e00")))       ; from hexadecimal
  (list                                 ;
   (as-rgb color1)                      ; converting to RGB
   (rgb-combination color1 +blue+ 0.4)  ; HSV autoconverted to RGB
   (hsv-combination color2 +blue+ 0.4)  ; RGB autoconverted to HSV
   color3))

evaluates to

'(#S(RGB :RED 20059/75000 :GREEN 13/25 :BLUE 247/1250)
  #S(RGB :RED 0.160472 :GREEN 0.312 :BLUE 0.51856) ; observe float contagion
  #S(HSV :HUE 60.0 :SATURATION 0.6722689 :VALUE 0.96000004)
  #S(RGB :RED 1 :GREEN 158/255 :BLUE 0))

Observe the float contagion: cl-colors functions don't care about the type of the numbers as long as they are a subtype of real and within the right range.

1.2Documentation

This library is so simple that it does not need a lot of documentation; please check the file introduction.org or just look at the docstring in colors.lisp.

1.3Testing

Run (ql:quickload :cl-colors2/tests).

1.4Regeneration of the X11 color names

Normally you should not need to do this, the sources already contain the autogenerated file colornames.lisp. However, if for some reason you need to regenerate this, you can use make. Even though the library itself does not depend on X11, regenerating this file will require the appropriate file in X11.

1.5Bugs and issues

Please report them on Notabug.

2Notes

This is a fork of https://github.com/tpapp/cl-colors, the original author marked it as unsupported.