add some more random

lindenmayer-system/lindenmeyer-system.html

@@ -133,8 +133,9 @@ function sierpinski() {
   * Barnsley Fern
   ************************************************/
 
- function barnsley_fern() {
+ function barnsley_fern(num_defects) {
      project.clear();
+     if(typeof num_defects == 'undefined') { num_defects = 0 };
      var r = generate(
          'iIXF'.split(''),
          [
@@ -144,13 +145,30 @@ function sierpinski() {
          6
      );
 
+     var n = 0;
+     while(n < num_defects) {
+         var rnd = Math.floor(Math.random()*r.length);
+         if((r[rnd] != '[') & (r[rnd] != ']')) {
+            r[rnd] = '*';
+            if(Math.random() > 0.9) {
+                if(Math.random() < 0.5) {
+                    r.splice(rnd, 0, '+');
+                } else {
+                    r.splice(rnd, 0, '-');
+                }
+            }
+            n += 1;
+         }
+     }
+
      console.log(r);
      var p = draw(
          r,
          {
              'F': draw_forward(),
              'i': draw_set_dir(Math.PI),
-             'I': draw_angle_init(25/180 * Math.PI  + Math.random() * 0.2),
+             'I': draw_angle_init(25/180 * Math.PI),
+             '*': draw_angle_add((Math.random() - 0.5) * 0.01),
              '-': draw_angle_turn(-1),
              '+': draw_angle_turn(1),
              '[': draw_state_push(),
@@ -221,10 +239,14 @@ window.onload = function() {
         window.globals.sierpinski();
     });
 
-    document.getElementById('barnsley_fern').addEventListener('click', function() {
+    document.getElementById('barnsley-fern').addEventListener('click', function() {
         window.globals.barnsley_fern();
     });
 
+    document.getElementById('barnsley-fern-defects').addEventListener('click', function() {
+        window.globals.barnsley_fern(150);
+    });
+
 }
 </script>
 
@@ -236,7 +258,8 @@ window.onload = function() {
 <button id="sierpinski2">sierpinski2</button>
 <button id="sierpinski2-defects">sierpinski2 (random defects)</button>
 <button id="sierpinski">sierpinski</button>
-<button id="barnsley_fern">barnsley_fern</button>
+<button id="barnsley-fern">barnsley fern</button>
+<button id="barnsley-fern-defects">barnsley fern (random defects)</button>
 <hr>
 <canvas id="canvas"  style="width: 500px; height: 500px;" resize></canvas>
 </body>