Data commit

Task/Langtons-ant/Processing-Python-mode/langtons-ant.processing-py

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+"""
+we use the following conventions:
+directions 0: up, 1: left, 2: down: 3: right
+
+pixel white: True, black: False
+
+turn right: True, left: False
+"""
+
+# number of iteration steps per frame
+# set this to 1 to see a slow animation of each
+# step or to 10 or 100 for a faster animation
+
+STEP = 100
+count = 0
+
+def setup():
+    global x, y, direction
+
+    # 100x100 is large enough to show the
+    # corridor after about 10000 cycles
+    size(100, 100, P2D)
+
+    background(255)
+    x = width / 2
+    y = height / 2
+    direction = 0
+
+def draw():
+    global count
+    for i in range(STEP):
+        count += 1
+        pix = get(x, y) != -1 # white =-1
+        setBool(x, y, pix)
+
+        turn(pix)
+        move()
+
+        if (x < 0 or y < 0 or x >= width or y >= height):
+            println("finished")
+            noLoop()
+            break
+
+    if count % 1000 == 0:
+        println("iteration {}".format(count))
+
+def move():
+    global x, y
+    if direction == 0:
+        y -= 1
+    elif direction == 1:
+        x -= 1
+    elif direction == 2:
+        y += 1
+    elif direction == 3:
+        x += 1
+
+def turn(rightleft):
+    global direction
+    direction += 1 if rightleft else -1
+    if direction == -1:
+        direction = 3
+    if direction == 4:
+        direction = 0
+
+def setBool(x, y, white):
+    set(x, y, -1 if white else 0)