use helix rendering on the path

src/shimmers/sketches/helix.cljs

@@ -3,14 +3,16 @@
    [clojure.math :as math]
    [shimmers.common.svg :as csvg :include-macros true]
    [shimmers.common.ui.controls :as ctrl]
+   [shimmers.math.deterministic-random :as dr]
    [shimmers.math.equations :as eq]
    [shimmers.math.vector :as v]
    [shimmers.sketch :as sketch :include-macros true]
    [shimmers.view.sketch :as view-sketch]
+   [thi.ng.geom.circle :as gc]
+   [thi.ng.geom.core :as g]
    [thi.ng.geom.line :as gl]
    [thi.ng.geom.vector :as gv]
-   [thi.ng.math.core :as tm]
-   [shimmers.math.deterministic-random :as dr]))
+   [thi.ng.math.core :as tm]))
 
 (def width 800)
 (def height 600)
@@ -24,8 +26,9 @@
   (math/sin (* eq/TAU (+ (* s f) p))))
 
 (defn fractional []
-  (/ (dr/random-int 1 10)
-     (dr/random-int 1 6)))
+  (+ (/ (dr/random-int 1 8)
+        (dr/random-int 1 5))
+     (dr/gaussian 0.0 0.1)))
 
 (defn harmonic-loop [center radius a b c]
   (for [s (tm/norm-range 256)]
@@ -37,7 +40,19 @@
         (tm/+ center))))
 
 (defn shapes [a b c]
-  (gl/linestrip2 (harmonic-loop (rv 0.5 0.5) (* 0.45 height) a b c)))
+  (let [pts (harmonic-loop (rv 0.5 0.5) (* 0.45 height) a b c)
+        r (* 0.0066 height)]
+    (for [[p q] (partition 2 1 pts)]
+      (let [z (tm/- q p)
+            delta (g/rotate z (/ eq/TAU 4))
+            left (tm/+ p delta)
+            right (tm/- p delta)
+            line-delta (tm/normalize delta (- (tm/mag delta) r))]
+        (csvg/group {}
+          (gc/circle left r)
+          (gc/circle right r)
+          (gl/line2 (tm/+ p line-delta)
+                    (tm/- p line-delta)))))))
 
 (defn scene [a b c]
   (csvg/svg-timed {:width width
@@ -49,8 +64,8 @@
 
 (defn page []
   (let [a (fractional)
-        b (fractional)
-        c (* -2 (fractional))]
+        b (- (fractional))
+        c (* -3 (fractional))]
     (fn []
       [sketch/with-explanation
        [:div.canvas-frame [scene a b c]]