From 04f39c05145f4a0d5f1dc6a77f3618c9745cbc88 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Thu, 16 Apr 2020 08:28:41 +0800
Subject: [PATCH] add spring

---
 examples/lsystem3_collection.scad | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/examples/lsystem3_collection.scad b/examples/lsystem3_collection.scad
index b2b3c127..6137722a 100644
--- a/examples/lsystem3_collection.scad
+++ b/examples/lsystem3_collection.scad
@@ -1,7 +1,7 @@
 use <experimental/lsystem3.scad>;
 use <hull_polyline3d.scad>;
 
-for(line = vine()) {
+for(line = spring()) {
     hull_polyline3d(
         [line[0], line[1]], 
         thickness = 0.25, 
@@ -48,4 +48,13 @@ function vine(n = 3, angle = 18, leng = 1, heading = 0, start = [0, 0, 0]) =
             ["F", "/F[++F]-\F[--F]+//F"]
         ]
     )
+    lsystem3(axiom, rules, n, angle, leng, heading, start);  
+
+function spring(n = 8, angle = 12, leng = 1, heading = 0, start = [0, 0, 0]) = 
+    let(
+        axiom = "F",
+        rules = [
+            ["F", "F-^F"]
+        ]
+    )
     lsystem3(axiom, rules, n, angle, leng, heading, start);  
\ No newline at end of file