From 3ffcc6f42e389106ea4e6591cc3a173b1b93c64f Mon Sep 17 00:00:00 2001
From: Kristian Rother <krother@academis.eu>
Date: Fri, 2 Feb 2024 14:02:38 +0100
Subject: [PATCH] cleanup

---
 examples/snake.py | 49 +++++++++++++++++++++--------------------------
 1 file changed, 22 insertions(+), 27 deletions(-)

diff --git a/examples/snake.py b/examples/snake.py
index b1465d8..8cbd50d 100644
--- a/examples/snake.py
+++ b/examples/snake.py
@@ -22,14 +22,14 @@
 MOVE_SPEED = 100
 
 MOVES = {
-    "a": (-1, 0),
-    "d": (1, 0),
-    "w": (0, -1),
-    "s": (0, 1),
+    "a": (-1, 0),  # left
+    "d": (1, 0),   # right
+    "w": (0, -1),  # up
+    "s": (0, 1),   # down
 }
 
 RAINBOW = [
-    (0, 0, 255),
+    (0, 0, 255),  # BGR - blue, green red
     (0, 128, 255),
     (0, 255, 255),
     (0, 255, 0),
@@ -38,34 +38,28 @@
 ]
 
 
-def ticker(speed: int):
-    counter = speed
-    while True:
-        for _ in range(counter):
-            yield False
-        yield True
-
-
 Color = tuple[int, int, int]
+Position = tuple[int, int]
+
 
 class Food(BaseModel):
-    position: tuple[int, int]
+    position: Position
     color: Color
 
 
 class Snake(BaseModel):
-    tail: list[tuple[int, int]] = []
-    colors: list[Color]
-    direction: str = (1, 0)
+    tail: list[Position] = []  # the tail is a queue
+    colors: list[Color] = []
+    direction: Position = (1, 0)
 
-    @property
+    @property   # decorator: allows us to use .head like an attribute
     def head(self):
         return self.tail[0]
 
     def move(self, food):
-        x, y = self.head
-        dx, dy = self.direction
-        new_head = x + dx, y + dy
+        x, y = self.head           # calls the function automatically
+        dx, dy = self.direction    # unpack a tuple into two variables
+        new_head = x + dx, y + dy  # create a new position tuple
         self.tail.insert(0, new_head)
         if new_head != food.position:
             self.tail.pop()
@@ -73,12 +67,13 @@ def move(self, food):
             self.colors.insert(0, food.color)
 
     def collides(self):
+        x, y = self.head
         return (
             self.head in self.tail[1:]
-            or self.head[0] < 0
-            or self.head[1] < 0
-            or self.head[0] == COLS
-            or self.head[1] == ROWS
+            or x < 0
+            or y < 0
+            or x == COLS
+            or y == ROWS
         )
 
 
@@ -102,8 +97,8 @@ def draw(snake, food):
 snake = Snake(tail=[(5, 5)], colors=[(255, 0, 255)])
 food = Food(position=(10, 5), color=next(color_gen))
 
-frame_tick = ticker(FRAME_SPEED)
-move_tick = ticker(MOVE_SPEED)
+frame_tick = cycle([True] + [False] * FRAME_SPEED)
+move_tick = cycle([True] + [False] * MOVE_SPEED)
 
 while not snake.collides():
     # draw everything