29 a

2020/sketch_2020_03_29a/sketch_2020_03_29a.pyde

@@ -0,0 +1,97 @@
+# Other L-System
+
+iterations = 8
+base_len = 350
+angle_deg = 15
+axiom = 'L'
+sentence = axiom
+rules = {
+    'L': '+FR-LFL+',
+    'R': '-FL+RFR-',
+}
+
+def setup():
+    size(700, 700)
+    global xo, yo
+    xo, yo = width / 2, height / 2 - 20
+    strokeWeight(0.5)
+    noFill()
+    generate(iterations)
+
+def draw():
+    background(0)
+    translate(xo, yo)
+    plot(radians(angle_deg))
+    resetMatrix()
+    fill(0, 200); noStroke()
+    rect(0, height - 80, width, 80)
+    fill(255)
+    t = "rules = {} axiom: '{}'\niterations:{} angle:{} stroke-len:{} sentence len: {}"
+    t = t.format(rules, axiom, iterations, angle_deg, int(stroke_len), len(sentence))
+    textSize(20)
+    text(t, 10, height - 50)
+
+def generate(n):
+    global stroke_len, sentence
+    for _ in range(n):
+        # stroke_len *= 0.5
+        next_sentence = ''
+        for c in sentence:
+            next_sentence += rules.get(c, c)
+        sentence = next_sentence
+    stroke_len = base_len * 2. / sqrt(len(sentence) + iterations + 10) 
+        
+def plot(angle):
+    for c in sentence:
+        if c == 'F':
+            stroke(255)
+            line(0, 0, 0, -stroke_len)
+            translate(0, -stroke_len)
+        if c == 'L':
+            stroke(255, 0, 0)
+            line(0, 0, 0, -stroke_len)
+        if c == 'R':
+            stroke(0, 0, 255)
+            line(0, 0, 0, -stroke_len)
+
+        elif c == '+':
+            rotate(angle)
+            # stroke(255, 0, 0)
+            # circle(0, 0, 5)
+        elif c == '-':
+            # stroke(0, 0, 255)
+            # circle(0, 0, 5)
+            rotate(-angle)
+        elif c == '[':
+            pushMatrix()
+        elif c == ']':
+            popMatrix()
+
+def keyPressed():
+    global angle_deg, xo, yo, stroke_len, iterations, sentence
+    if key == '-':
+        angle_deg -= 1.
+    if str(key) in "=+":
+        angle_deg += 1
+    # if key == 's':
+    saveFrame('angle{}-{}.png'.format(angle_deg, iterations))
+    if key == '.':
+        iterations += 1
+        sentence = axiom
+        generate(iterations)
+    if key == ',':
+        iterations -= 1
+        sentence = axiom
+        generate(iterations)
+    if key == 'a':
+        stroke_len *= 1.1
+    if key == 'z':
+        stroke_len /= 1.1
+    if keyCode == LEFT:
+        xo -= 50
+    if keyCode == RIGHT:
+        xo += 50
+    if keyCode == UP:
+        yo -= 50
+    if keyCode == DOWN:
+        yo += 50

README.md

@@ -17,6 +17,36 @@ You may also support my artistic work, open educational resources and research u
 
 ---
 
+![sketch_2020_03_29a](sketch_2020_03_29a/sketch_2020_03_29a.gif)
+
+[sketch_2020_03_29a](https://github.com/villares/sketch-a-day/tree/master/2020/sketch_2020_03_29a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+```python
+axiom = 'L'
+rules = {
+    'L': '+FR-LFL+',
+    'R': '-FL+RFR-',
+}
+...
+   for c in sentence:
+        if c == 'F':
+            stroke(255)
+            line(0, 0, 0, -stroke_len) # draw white line
+            translate(0, -stroke_len) # move
+        elif c == 'L':
+            stroke(255, 0, 0)
+            line(0, 0, 0, -stroke_len) # red does not move!
+        elif c == 'R':
+            stroke(0, 0, 255)
+            line(0, 0, 0, -stroke_len) # blue does not move!
+        elif c == '+':
+            rotate(angle)
+        elif c == '-':
+            rotate(-angle)
+```
+
+---
+
 ![sketch_2020_03_28a](2020/sketch_2020_03_28a/sketch_2020_03_28a.png)
 
 [sketch_2020_03_28a](https://github.com/villares/sketch-a-day/tree/master/2020/sketch_2020_03_28a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]