use a CompoundPath

lindenmayer-system/lindenmeyer-system.js

@@ -53,11 +53,15 @@ function draw_initstate(state) {
 function draw_forward() {
     return function(p, state) {
         draw_initstate(state);
-        if(p.length == 0) {
+        if(p.children.length == 0) {
-            p.add(new paper.Point(0, 0));
+            p.addChild(new paper.Path());
         }
-        var lastp = p.segments[p.segments.length - 1].point;
+        var pp = p.lastChild;
-        p.add(lastp.add(
+        if(pp.length == 0) {
+            pp.add(new paper.Point(0, 0));
+        }
+        var lastp = pp.segments[pp.segments.length - 1].point;
+        pp.add(lastp.add(
             new paper.Point(Math.sin(state.dir), Math.cos(state.dir))
         ));
     }
@@ -95,7 +99,7 @@ function draw_angle_add(delta) {
 
 
 function draw(word, actions) {
-    var p = new paper.Path();
+    var p = new paper.CompoundPath();
     var state = {};
     for(let w of word) {
         if(w in actions) {