procedure
( identikon width
height
input
[ rules
#:filenameboolean?]) → image?
width:exact-positive-integer?
height:exact-positive-integer?
input:(or/c symbol? string? )
rules:(or/c symbol? string? )="default"
boolean?:#t=#f

Identikon provides a single function, identikon , which produces images based on input. If input is a string or symbole, a SHA1 hash will be produced and used to geneate an image. If a filename is provided a SHA1 of the file will be produced and used as input for generating images.

Produces an identikon with dimensions specified by width and height.

input is converted into a list of numbers based on a SHA1 hash and passed to a rules module for processing into an image?.

rules is the name of the rules module to use in generating the identicon. This defaults to "default".

If #:filename is #t then identikon will treat the value of input as a filename and attempt fo open it for processing.

Examples:

Create a 300x300px identicon for "racket" using the "default.rkt" rule module.

Example:

> (identikon 300300"racket")

[画像:image]

Create a 300x300 identicon for "racket" using the "squares.rkt" rule module.

Example:

> (identikon 300300"racket"'squares)

[画像:image]

procedure
( save-identikon filename
type
image
[ #:qualitynumber?]) → (or/c void? exn:fail? )
filename:string?
type:(or/c symbol? string? )
image:image?
number?:natural-number/c =75

Save an identikon image to disk. Available types are svg, png and jpeg. If the file already exists, a new version of the file will be saved with a timestamp (seconds) appended.

#:quality only affects jpeg images.

(save-identikon "foo"'png
(identikon 300300'racket'qbert))

procedure
( identikon->string type
image
[ #:qualitynumber?]) → string?
type:(or/c symbol? string? )
image:image?
number?:natural-number/c =75

Return an identikon in a string format. This is useful if you want to inject the image directly into an HTML page as an <svg/> element or as a data-uri.

Available types are svg, png and jpeg.

svg will emit a well formed SVG element.

png and jpeg types will emit a string of base-64 encoded bytes suitable for use in an HTML data-uri.

#:quality only affects jpeg images.

(identikon->string (identikon 300300'racket'qbert)'svg)

3Rules modules🔗 i

All rules modules must provide a single draw-rules function and live in the rules folder.

procedure
( draw-ruleswidthheightuser)→image?
width:exact-positive-integer?
height:exact-positive-integer?
user:(listof exact-positive-integer? )

Example:

> (draw-rules
200
200
'(2718020017618977681561211209117218721463814418424176))

[画像:image]

4License & source code🔗 i

This module is under the MIT license.

Source repository at https://github.com/DarrenN/identikon. Suggestions, corrections and pull-requests welcome.

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