From a67097fb073d3ceffb34ee0826f4bb029986ee0e Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <rekado@elephly.net>
Date: Sun, 11 Apr 2021 23:45:35 +0200
Subject: website: Add Guile code for generating logo.

---
 website/logo.scm | 229 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 229 insertions(+)
 create mode 100644 website/logo.scm

diff --git a/website/logo.scm b/website/logo.scm
new file mode 100644
index 0000000..e4164a3
--- /dev/null
+++ b/website/logo.scm
@@ -0,0 +1,229 @@
+;;; This file uses the Guile Picture Language to generate the GNU
+;;; Assembly logo variants and favicon.
+;;;
+;;; The League spartan font is available here:
+;;; https://www.theleagueofmoveabletype.com/league-spartan
+;;;
+;;; After generating the SVG files, any text should be converted to
+;;; paths so that viewers don't need to have that font installed.  The
+;;; picture language cannot do this yet, so I recommend using
+;;; Inkscape manually.
+;;;
+;;; The logo is released under CC-BY-SA 4.0 or any other license as
+;;; agreed upon after a vote by the GNU Assembly.
+;;;
+;;; ~~ Ricardo
+
+(import (pict)
+        (srfi :1))
+
+(define palette
+  (list "#073b4c"
+        "#118ab2"
+        "#06d6a0"
+        "#ffd166"
+        "#ef476f"))
+
+(define hill-color
+  "#ffe9b2")
+
+(define next-color
+  (let ((index 0)
+        (palette* (list-tail palette 1)))
+    (lambda ()
+      (set! index (modulo (1+ index)
+                          (length palette*)))
+      (list-ref palette* index))))
+
+(define* (wildebeest #:key (color "black"))
+  (fill
+   (path
+    (list (move-to '(14 . 5))
+          ;; The wildebeest is drawn counter-clockwise, starting from
+          ;; the right horn.
+
+          ;; head
+          (curve '((-1.6 . 1.2) (-2.5 . 1.4) (-2.5 . 0.7)))
+          (curve '((0 . -0.4) (-1.9 . -5.4) (-2.3 . -5.3)))
+          (curve '((-0.2 . 0) (2 . 4.1) (0.3 . 5.9)))
+          (curve '((-0.9 . 1.2) (-1.9 . 0.8) (-3.2 . 1.1)))
+          (curve '((-0.7 . 0.2) (-0.9 . -0.3) (-1 . -0.7)))
+          (curve '((-0.3 . -1.9) (0.7 . -6.6) (0.4 . -6)))
+          (curve '((-0.67 . 1.32) (-1 . 2.7) (-1.5 . 5.1)))
+          (curve '((-0.5 . 2.5) (-1.6 . 2.8) (-2.3 . 4.8)))
+          (curve '((-1.5 . 4.1) (-2.1 . 8.9) (-1.1 . 11.3)))
+          (curve '((0.5 . 1.3) (0.9 . 1) (2.3 . 0.8)))
+          (curve '((0.3 . 0) (0.7 . -0.7) (1 . -0.7)))
+          (curve '((0.7 . 0) (1.1 . 0.8) (1.8 . 1.2)))
+          (curve '((1.3 . 0.6) (2.5 . 1.5) (2.3 . 1.1)))
+          (curve '((-0.2 . -0.3) (-0.1 . -0.9) (0 . -1.2)))
+          (curve '((0.2 . -0.7) (0.4 . -0.7) (1.6 . -0.2)))
+
+          ;; right foreleg
+          (curve '((0.7 . 0.3) (1.5 . 0.8) (1.7 . 1.1)))
+          (curve '((0.2 . 0.3) (0.5 . 0.7) (1.9 . 1.3)))
+          (curve '((1 . 0.4) (2.1 . 0.9) (2.1 . 1.1)))
+          (curve '((0 . 0.7) (-1 . 1) (-1.8 . 1.7)))
+          (curve '((-0.8 . 0.7) (-2.4 . 2) (-2.6 . 2.9)))
+          (curve '((-0.2 . 0.7) (2.7 . 4) (3.2 . 4.7)))
+          (curve '((0.1 . 0.8) (0.7 . 0.7) (0.9 . 1.7)))
+          (curve '((0.3 . 0.8) (0.8 . 1.4) (2.4 . 2.8)))
+          (curve '((1.9 . 1.6) (2.5 . 1.6) (2.4 . 1)))
+          (curve '((-0.2 . -0.8) (-0.5 . -4.2) (-1.2 . -4.2)))
+          (curve '((-0.4 . 0) (-0.9 . 0.6) (-1 . 0.2)))
+          (curve '((-0.1 . -0.5) (-0.4 . -0.6) (-0.8 . -0.6)))
+          (curve '((-0.2 . 0) (-1.7 . -2.4) (-2 . -2.4)))
+          (curve '((-0.3 . -0.3) (-1.7 . -2.8) (-1.7 . -2.8)))
+
+          ;; left foreleg
+          (curve '((0 . 0) (2.3 . -1.7) (2.2 . -1.7)))
+          (curve '((0 . 0) (-1.2 . 1.7) (-1.9 . 3.5)))
+          (curve '((-0.9 . 2.2) (-1.2 . 4.2) (-1.5 . 4.8)))
+          (curve '((-0.2 . 0.4) (-0.5 . 0.5) (-1 . 1.3)))
+          (curve '((-0.5 . 0.8) (-0.7 . 1.6) (-0.1 . 2.8)))
+          (curve '((0.4 . 0.9) (4 . -2.2) (3.4 . -3.7)))
+          (curve '((-0.4 . -1.10) (0.5 . -3.4) (0.7 . -4.1)))
+          (curve '((0.5 . -1.8) (1.7 . -3.1) (3.2 . -4.4)))
+          (curve '((2.5 . -2) (2.2 . -2) (9.1 . -0.7)))
+
+          ;; left hindleg
+          (curve '((2.8 . 0.5) (2.8 . 0.2) (4.9 . 2.7)))
+          (curve '((1.1 . 1.4) (4 . 3.9) (5.1 . 6.4)))
+          (curve '((0.2 . 0.4) (0.3 . 0.7) (0.3 . 1.2)))
+          (curve '((-0.4 . 1.5) (-0.3 . 3.7) (-1.4 . 5)))
+          (curve '((-0.5 . 1) (-1.5 . 2.1) (0.2 . 1.9)))
+          (line-to '(2.2 . 0))
+          (line-to '(0.3 . -2.3))
+          (curve '((0.3 . -2.2) (0 . -5) (0.4 . -7.2)))
+          (curve '((0.1 . -0.2) (-3.8 . -4) (-3.8 . -4.4)))
+          (curve '((0 . -0.5) (-0.2 . -2.8) (0 . -2.7)))
+
+          ;; right hindleg
+          (curve '((0.2 . 0.1) (0.4 . 3.7) (0.5 . 4.2)))
+          (curve '((0.1 . 0.6) (-0.5 . 1.6) (-2.6 . 3.6)))
+          (curve '((-3.1 . 3) (-4.3 . 4.6) (-4.4 . 5.4)))
+          (curve '((0 . 0.8) (2.2 . 0.7) (2.9 . -0.1)))
+          (curve '((0.4 . -0.4) (1 . -2.4) (1 . -2.4)))
+          (curve '((1.4 . -1.4) (3 . -3.2) (4.1 . -3.7)))
+          (line-to '(1 . -1.9))
+          (curve '((0.1 . -1.7) (-1 . -7.2) (0.3 . -8.8)))
+          (curve '((0.3 . -0.4) (1.2 . -3) (1.2 . -3)))
+
+          ;; tail
+          (curve '((0.5 . 1.8) (4 . 4.7) (4 . 4.7)))
+          (curve '((-0.5 . -0.8) (-0.4 . -0.9) (-0.4 . -0.9)))
+          (curve '((0 . 0) (2.8 . 0.9) (4.2 . 0.5)))
+          (curve '((2 . -0.6) (4.8 . -4) (4.8 . -4)))
+          (curve '((-1.3 . 1.1) (-1.3 . 0.8) (-2.5 . 1.2)))
+          (curve '((0 . 0) (0.8 . -1) (1.1 . -1.4)))
+          (curve '((1 . -1.4) (1.6 . -3.6) (2 . -5.1)))
+          (curve '((-0.2 . 0.4) (-0.4 . 0.4) (-0.5 . 0.4)))
+          (curve '((-0.2 . -0.6) (1.1 . -3.3) (1.1 . -3.3)))
+          (curve '((-0.9 . 0.9) (-1.8 . 1.8) (-2.6 . 3.2)))
+          (curve '((-1.3 . 2.2) (-2.4 . 4.7) (-4.4 . 6.2)))
+          (curve '((-1.3 . 1) (-4.8 . -2) (-4.8 . -2)))
+          (curve '((-1.4 . -0.9) (-1.5 . -2.1) (-1.7 . -2.1)))
+
+          ;; back
+          (line-to '(0.1 . 0.2))
+          (curve '((0.2 . -2.4) (-3 . -5.4) (-4.4 . -6.3)))
+          (curve '((-5.8 . -1.4) (-7.4 . -2.16) (-9.8 . -3.9)))
+          (curve '((0 . 0) (2.8 . 0.4) (3.3 . -0.8)))
+          (curve '((-1.1 . 0.6) (-3.6 . -0.2) (-5.6 . -1.2)))
+          (curve '((-3.5 . -1.9) (-4 . -2.6) (-5.2 . -2.6)))
+          (curve '((-0.8 . 0) (-1.9 . -0.2) (-1.9 . -1)))
+          (curve '((-0.1 . -0.8) (0.3 . -0.8) (1.5 . -1.2)))
+          (curve '((-0.7 . -0.1) (-2.5 . 0.2) (-3.6 . 1.1)))
+
+          (close-path))
+    #:stroke-width 0)
+   color))
+
+(define parliament
+  (begin
+    (next-color)(next-color)
+    (rotate
+     (apply cc-superimpose
+            (map (lambda (n)
+                   (let ((segment (disk 18 #:color (next-color))))
+                     (rotate (expand segment #:right 130)
+                             (* n 24))))
+                 (iota 8)))
+     -35)))
+
+(define hill
+  (scale
+   (fill
+    (polygon '((0 . 30)
+               (10 . 30)
+               (20 . 25)
+               (40 . 20)
+               (60 . 5)
+               (80 . 10)
+               (100 . 30))
+             #:border-width 0)
+    hill-color)
+   2.8))
+
+(define composition
+  (expand
+   (cc-superimpose
+    (expand parliament #:bottom 40)
+    (expand hill #:top 20)
+    (expand
+     (scale (wildebeest #:color (first palette)) 2.8)
+     #:left 80))
+   #:bottom -50
+   #:left -20))
+
+(define composition-with-text
+  (expand
+   (vc-append
+    composition
+    (hb-append
+     (text "the"
+           #:border-width 0
+           #:font-family "League spartan Light"
+           #:color (first palette)
+           #:font-size 32)
+     (expand
+      (text "gnu"
+            #:border-width 0
+            #:font-family "League spartan ExtraBold"
+            #:color (second palette)
+            #:font-size 32)
+      #:left 5
+      #:right 5)
+     (text "assembly"
+           #:border-width 0
+           #:font-family "League spartan Light"
+           #:color (first palette)
+           #:font-size 32)))
+   #:bottom 10))
+
+(define favicon
+  (let ((circles
+         (expand (scale parliament 0.5)
+                 #:amount -10)))
+    (scale
+     (cc-superimpose
+      (filled-rectangle
+       (pict-width circles)
+       (pict-height circles)
+       #:color "white")
+      circles
+      (expand (text "g"
+                    #:border-width 0
+                    #:font-family "League spartan ExtraBold"
+                    #:color (first palette)
+                    #:font-size 64)
+              #:left 5))
+     0.3)))
+
+(define small-wildebeest
+  (wildebeest #:color (first palette)))
+
+(pict->file composition-with-text "/tmp/logo.svg")
+(pict->file composition "/tmp/logo-small.svg")
+(pict->file favicon "/tmp/favicon.svg")
+(pict->file small-wildebeest "/tmp/wildebeest.svg")
-- 
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