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main.py

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+from st3m.reactor import Responder
+from st3m.run import run_responder
+
+UP    = 0
+LEFT  = 1
+DOWN  = 2
+RIGHT = 3
+
+
+class Random:
+    def __init__(self):
+        self._state = 0x9ec5_9ec5 # (two gecs)
+
+    # idk its fine its just for choosing delay and direction
+    def next(self):
+        self._state *= 37
+        self._state &= 0xffff_ffff
+        return self._state >> 24
+
+    def direction(self):
+        return self.next() & 3
+
+    def delay(self):
+        return Box.TURN_DELAY_BASE + self.next()
+
+# screen coords range ±120 each side
+
+TRANSPARENT = (1, 0, 1)
+
+def to_image(str):
+    cols = {
+        ' ': TRANSPARENT,
+        '#': (0,   0,   0),
+        '%': (.6,  .6,  .6),
+        '*': (.26, .26, .26),
+        ':': (0,   .41, 0),
+        "'": (.87, .87, .87),
+        '.': (.87, .87, 0),
+    }
+    lines = str.strip().split('\n')
+    lmap = lambda f, xs: list(map(f, xs))
+    return lmap(lambda l: lmap(lambda c: cols[c], l), lines)
+
+
+quox_left_1 = to_image("""
+     %      *         
+%     %  * %*% *   :# 
+%%%% %%% *%%*%%*   ::%
+ %%#%%%  *%%*%%*%*  :#
+  %%'%%% *%%*%*%*   :#
+ %%%%%%:  *%*%**   ::%
+%%  %%#:::*%**%*:  :##
+      %%::::::%*::::% 
+      ##:::::::::::## 
+       %:::%#%:::%#%  
+      #*:::##*:::#    
+    ##***::#***::###  
+     ##.%%:##.%%:##   
+""")
+
+class Box(Responder):
+    STEP_DELAY = 500
+    TURN_DELAY_BASE = 1400
+
+    def __init__(self):
+        self.random = Random()
+        self.choose_direction()
+        self.choose_turn_delay()
+        self.step = 0
+        self.step_delay = Box.STEP_DELAY
+
+    def draw(self, ctx):
+        self.clear(ctx)
+        self.rect(ctx)
+        # self.text(ctx)
+
+    def clear(self, ctx):
+        ctx.rgb(0, 0, 0) \
+           .rectangle(-120, -120, 240, 240) \
+           .fill()
+
+    @staticmethod
+    def coord(d):
+        if d == UP:
+            return (-20, -100)
+        elif d == LEFT:
+            return (-100, -20)
+        elif d == RIGHT:
+            return (100, 20)
+        elif d == DOWN:
+            return (20, 100)
+
+    def rect(self, ctx):
+        if self.step:
+            ctx = ctx.rgb(.1, .6, .3)
+        else:
+            ctx = ctx.rgb(.1, .3, .6)
+        ctx.rectangle(0, 0, *Box.coord(self.direction)).fill()
+
+    def text(self, ctx):
+        ctx.rgb(1, 1, 1) \
+           .move_to(0, 0).text(str(self.delay) + '; ' + str(self.direction))
+
+    def think(self, state, Δ):
+        self.update_delay(Δ)
+
+    def update_delay(self, Δ):
+        self.turn_delay -= Δ
+        self.step_delay -= Δ
+        if self.turn_delay <= 0:
+            old_delay = self.turn_delay
+            self.choose_direction()
+            self.choose_turn_delay(old_delay)
+        if self.step_delay <= 0:
+            self.step_delay = Box.STEP_DELAY
+            self.step = (self.step + 1) & 4
+
+    def choose_direction(self):
+        self.direction = self.random.direction()
+
+    def choose_turn_delay(self, subtract=0):
+        self.turn_delay = self.random.delay() - subtract
+
+run_responder(Box())