Create sketch_2020_06_11a.pyde

2020/sketch_2020_06_11a/sketch_2020_06_11a.pyde

@@ -0,0 +1,36 @@
+def setup():
+    size(500, 500)
+    noStroke()
+
+def draw():
+    background(240)
+    noStroke()
+    tc = poly_points(250, 250, 100, n=24)
+    for i, p in enumerate(tc):
+        t(p[0], p[1], 100, 5 * i * radians(210))
+
+def t(x, y, s, rot=0, d=71):
+    pp = poly_points(x, y, s, 3, rot + PI)
+    e0 = div_points(pp[0], pp[1], d)
+    e1 = div_points(pp[1], pp[2], d)[::-1]
+    fill(0)
+    lines = zip(e0, e1)
+    for la, lb in zip(lines[:-1:2], lines[1::2]):
+        (x0, y0), (x1, y1) = la
+        (x3, y3), (x2, y2) = lb
+        quad(x0, y0, x1, y1,
+             x2, y2, x3, y3)
+
+def div_points(a, b, d=10):
+    return [(lerp(a[0], b[0], float(i) / d),
+             lerp(a[1], b[1], float(i) / d))
+            for i in range(d + 1)]
+
+def poly_points(x, y, r, n, rot=0):
+    a = TWO_PI / n
+    points = []
+    for i in range(n):
+        px = x + r * cos(a * i + rot)
+        py = y + r * sin(a * i + rot)
+        points.append((px, py))
+    return points