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2019/sketch_191120a/sketch_191120a.pyde

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+# Baseado no L-System apresentado pela Tatasz na
+# Noite de Processing
+
+iterations = 6 
+stroke_len = 300
+angle_deg = 90
+axiom = "HGF"
+sentence = axiom
+rules = {
+         "F": "F-F++F-F",
+         "G": "[HG]HGF",
+         "H": "F[-GH]+GH",
+         }
+
+def setup():
+    size(700, 700)
+    strokeWeight(1)
+    noFill()
+    generate(iterations)
+    
+def draw():
+    background(0)    
+    translate(width / 2, 250)
+    plot(radians(angle_deg))
+
+def generate(n):
+    global stroke_len, sentence
+    for c in range(n):
+        stroke_len *= 0.5
+        next_sentence = ""
+        for c in sentence:
+            next_sentence += rules.get(c, c)
+        sentence = next_sentence
+
+def plot(angle):
+    for c in sentence:
+        if c == "F":
+            line(0, 0, stroke_len/2, -stroke_len)
+            translate(0, -stroke_len)
+            # ellipse(0, 0, 10, 10)
+        elif c == "G":
+            line(0, 0, stroke_len/2, -stroke_len)
+            translate(0, -stroke_len)
+        elif c == "H":
+            line(0, 0, stroke_len/2, -stroke_len)
+            translate(0, -stroke_len)
+        elif c == "+":
+            stroke(255, 0, 255)
+            rotate(angle)
+        elif c == "-":
+            stroke(0, 255, 255)
+            rotate(-angle)
+        elif c == "[":
+            stroke(255, 255, 0)
+            pushMatrix()
+        elif c == "]":
+            stroke(0, 0, 255)
+            popMatrix()
+  
+def keyPressed():
+    print(angle_deg)
+    global angle_deg
+    if keyCode == LEFT:
+        angle_deg -= 5
+    if keyCode == RIGHT:
+        angle_deg += 5        
+    if key == 's':
+        saveFrame("####.png")
+                      
+                                          
+def settings():
+    """ print markdown to add at the sketch-a-day page"""
+    from os import path
+    global SKETCH_NAME, OUTPUT
+    SKETCH_NAME = path.basename(sketchPath())
+    OUTPUT = ".png"
+    println(
+        """
+![{0}]({2}/{0}/{0}{1})
+
+[{0}](https://github.com/villares/sketch-a-day/tree/master/{2}/{0}) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+""".format(SKETCH_NAME, OUTPUT, year())
+    )