add some other tree

lindenmayer-system/lindenmeyer-system.html

@@ -182,6 +182,70 @@ function sierpinski() {
  }
 
 
+ /************************************************
+  * some other tree
+  ************************************************/
+
+ function other_tree(num_defects) {
+     project.clear();
+     if(typeof num_defects == 'undefined') { num_defects = 0 };
+     var r = generate(
+         'iIjX'.split(''),
+         [
+             ['X'.split(''), 'F[-lfX][cfX][+rfX]'.split('')],
+             //['F'.split(''), 'FF'.split('')],
+             //['L'.split(''), 'LL'.split('')],
+             //['C'.split(''), 'CC'.split('')],
+             //['R'.split(''), 'RR'.split('')],
+         ],
+         8
+     );
+
+     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(),
+             'f': draw_forward(0.5),
+
+             'l': draw_stepsize_mul(0.7),
+             'c': draw_stepsize_mul(0.8),
+             'r': draw_stepsize_mul(0.7),
+
+             'i': draw_set_dir(Math.PI),
+             'I': draw_angle_init(25/180 * Math.PI),
+             'j': draw_set_turn_noise(1),
+
+             '*': draw_angle_add((Math.random() - 0.5) * 0.01),
+             '-': draw_angle_turn(-1),
+             '+': draw_angle_turn(1),
+             '[': draw_state_push(),
+             ']': draw_state_pop(),
+         }
+     );
+     p.scale(60);
+     p.translate(new Point(200, 200));
+     p.strokeWidth = 1;
+     p.strokeColor = '#ff00ff';
+ }
+
+
 /************************************************
  * 
  ************************************************/
@@ -190,6 +254,7 @@ globals.dragon_curve = dragon_curve;
 globals.sierpinski2 = sierpinski2;
 globals.sierpinski = sierpinski;
 globals.barnsley_fern = barnsley_fern;
+globals.other_tree = other_tree;
 
 globals.get_svg = function() {
     return project.exportSVG({asString: true});
@@ -247,6 +312,10 @@ window.onload = function() {
         window.globals.barnsley_fern(150);
     });
 
+     document.getElementById('other-tree').addEventListener('click', function() {
+         window.globals.other_tree();
+     });
+
 }
 </script>
 
@@ -260,6 +329,7 @@ window.onload = function() {
 <button id="sierpinski">sierpinski</button>
 <button id="barnsley-fern">barnsley fern</button>
 <button id="barnsley-fern-defects">barnsley fern (random defects)</button>
+<button id="other-tree">other tree</button>
 <hr>
 <canvas id="canvas"  style="width: 500px; height: 500px;" resize></canvas>
 </body>

lindenmayer-system/lindenmeyer-system.js

@@ -52,6 +52,10 @@ function generate(start, rules, iterations) {
 function draw_initstate(p, state) {
     if(!('dir' in state)) {
         state.dir = 0;
+        state.turnnoise = 0;
+    }
+    if(!('stepsize' in state)) {
+        state.stepsize = 1;
     }
     if(!('curpath' in state)) {
         p.addChild(new paper.Path());
@@ -67,7 +71,14 @@ function draw_set_dir(dir) {
 }
 
 
-function draw_forward() {
+function draw_set_turn_noise(level) {
+    return function(p, state) {
+        state.turnnoise = level;
+    }
+}
+
+
+function draw_forward(factor=1) {
     return function(p, state) {
         draw_initstate(p, state);
         if(state.curpath.segments.length == 0) {
@@ -76,12 +87,26 @@ function draw_forward() {
         }
         var lastp = state.curpath.segments[state.curpath.segments.length - 1].point;
         state.curpath.add(lastp.add(
-            new paper.Point(Math.sin(state.dir), Math.cos(state.dir))
+            new paper.Point(Math.sin(state.dir) * state.stepsize * factor,
+                            Math.cos(state.dir) * state.stepsize * factor)
         ));
     }
 }
 
 
+function draw_stepsize_mul(factor) {
+    return function(p, state) {
+        if(typeof factor == 'function') {
+            var f = factor();
+        } else {
+            var f = factor;
+        }
+        draw_initstate(p, state);
+        state.stepsize *= f;
+    };
+}
+
+
 function draw_turn(angle) {
     return function(p, state) {
         draw_initstate(p, state);
@@ -93,7 +118,8 @@ function draw_turn(angle) {
 function draw_angle_turn(fac) {
     return function(p, state) {
         draw_initstate(p, state);
-        state.dir += state.angle * fac;
+        var a = state.angle * (1 + (Math.random() - 0.5) * state.turnnoise);
+        state.dir += a * fac;
     }
 }
 
@@ -120,6 +146,7 @@ function draw_state_push() {
         state.stack.push({
             pos: state.curpath.segments[state.curpath.segments.length - 1].point,
             dir: state.dir,
+            stepsize: state.stepsize,
         });
     }
 }
@@ -129,6 +156,7 @@ function draw_state_pop() {
     return function(p, state) {
         var s = state.stack.pop();
         state.dir = s.dir;
+        state.stepsize = s.stepsize;
         p.addChild(new paper.Path());
         state.curpath = p.lastChild;
         state.curpath.add(s.pos);