Add logo.png and script to construct logo

logo/README.md

@@ -0,0 +1,17 @@
+# whirl logo
+
+To create the _whirl_ logo, you should install the following:
+
+```bash
+$ brew install cairo
+```
+
+Make sure you are using a Python 3 (virtual) environment:
+
+```bash
+$ pip install -r requirements.txt
+```
+
+```bash
+$ python logo.py
+```

logo/logo.py

@@ -0,0 +1,56 @@
+import turtle
+import canvasvg
+import sys
+import cairosvg
+
+sys.setrecursionlimit(10000)
+
+COLORS = [
+    (225, 0, 0),
+    (0, 225, 225),
+    (102, 225, 51),
+    (51, 153, 225)
+]
+
+
+def create_whirl(size, sides, angle_diff, shorten_with, min_line_length):
+    angle = 360 / sides
+
+    def create_inner(length, step):
+        t.pencolor(COLORS[step % len(COLORS)])
+        t.right(angle + angle_diff)
+        t.forward(length)
+        new_length = length - shorten_with
+        if new_length > min_line_length:
+            create_inner(new_length, step + 1)
+
+    # t.left(angle/2)
+    for x in range(0, sides):
+        t.pencolor(COLORS[x % len(COLORS)])
+        t.forward(size)
+        if x < sides - 1:
+            t.right(angle)
+
+    create_inner(size - shorten_with, 0)
+
+
+def create_whirl_logo():
+    create_whirl(size=50, sides=12, angle_diff=0.1, shorten_with=0.12, min_line_length=2)
+
+
+t = turtle.Turtle()
+turtle.colormode(255)
+t.hideturtle()
+t.color(0, 0, 0)
+t.speed(0)
+t.pensize(2)
+
+create_whirl_logo()
+
+t.hideturtle()
+t.color(255, 255, 255)
+ts = turtle.getscreen().getcanvas()
+canvasvg.saveall("logo.svg", ts)
+
+with open("logo.svg") as svg_input, open("logo.png", 'wb') as png_output:
+    cairosvg.svg2png(bytestring=svg_input.read(), write_to=png_output)

logo/requirements.txt

@@ -0,0 +1,2 @@
+canvasvg
+cairosvg