# Snake

Le **snake**, de l'anglais signifiant *serpent*, est un genre de jeu vidéo dans lequel le joueur dirige un serpent qui grandit et constitue ainsi lui-même un obstacle.

Le navigateur Google a intégré dans son navigateur la possibilité de jouer gratuitement à sa version de Snake. Il suffit de taper *snake* dans le moteur de recherche pour y accéder.

 ```{codeplay}
import turtle
import time
import random

delay = 0.1
score = 0
high_score = 0

wn = turtle.Screen()
wn.bgcolor("blue")

# head of the snake
head = turtle.Turtle()
head.shape("square")
head.color("white")
head.penup()
head.goto(0, 0)
head.direction = "Stop"
 
 
# food in the game
food = turtle.Turtle()
colors = random.choice(['red', 'green', 'black'])
shapes = random.choice(['square', 'triangle', 'circle'])
food.speed(0)
food.shape(shapes)
food.color(colors)
food.penup()
food.goto(0, 100)

pen = turtle.Turtle()
pen.speed(0)
pen.shape("square")
pen.color("white")
pen.penup()
pen.hideturtle()
pen.goto(0, 150)
pen.write("Score : 0  High Score : 0", align="center", font=(None, 24, "bold"))

# assigning key directions
def go_up():
    if head.direction != "down":
        head.direction = "up"
 
def go_down():
    if head.direction != "up":
        head.direction = "down"
 
def go_left():
    if head.direction != "right":
        head.direction = "left"
 
def go_right():
    if head.direction != "left":
        head.direction = "right"
 
def move():
    if head.direction == "up":
        y = head.ycor()
        head.sety(y+20)
    if head.direction == "down":
        y = head.ycor()
        head.sety(y-20)
    if head.direction == "left":
        x = head.xcor()
        head.setx(x-20)
    if head.direction == "right":
        x = head.xcor()
        head.setx(x+20)
 
wn.listen()
wn.onkey(go_up, "w")
wn.onkey(go_down, "s")
wn.onkey(go_left, "a")
wn.onkey(go_right, "d")
```

## Version finale

```{codeplay}
# import required modules
import turtle
import time
import random

delay = 0.1
score = 0
high_score = 0

# Creating a window screen
wn = turtle.Screen()
wn.bgcolor('blue')
# the width and height can be put as user's choice
wn.tracer(0)

# head of the snake
head = turtle.Turtle()
head.shape('square')
head.color('white')
head.penup()
head.goto(0, 0)
head.direction = "Stop"

# food in the game
food = turtle.Turtle()
food.speed(0)
food.shape('circle')
food.color('red')
food.penup()
food.goto(0, 100)

pen = turtle.Turtle()
pen.speed(0)
pen.shape('square')
pen.color('white')
pen.penup()
pen.hideturtle()
pen.goto(0, 150)
pen.write("Score : 0 High Score : 0", align="center",
        font=("candara", 24, "bold"))

# assigning key directions
def group():
    if head.direction != "down":
        head.direction = "up"

def godown():
    if head.direction != "up":
        head.direction = "down"

def goleft():
    if head.direction != "right":
        head.direction = "left"

def goright():
    if head.direction != "left":
        head.direction = "right"

def move():
    if head.direction == "up":
        y = head.ycor()
        head.sety(y+20)
    if head.direction == "down":
        y = head.ycor()
        head.sety(y-20)
    if head.direction == "left":
        x = head.xcor()
        head.setx(x-20)
    if head.direction == "right":
        x = head.xcor()
        head.setx(x+20)
        
wn.listen()
wn.onkey(group, "w")
wn.onkey(godown, "s")
wn.onkey(goleft, "a")
wn.onkey(goright, "d")

segments = []

# Main Gameplay
while True:
    wn.update()
    if head.xcor() > 190 or head.xcor() < -190 or head.ycor() > 190 or head.ycor() < -290:
        time.sleep(1)
        head.goto(0, 0)
        head.direction = "Stop"
        for segment in segments:
            segment.goto(1000, 1000)
        segments.clear()
        score = 0
        delay = 0.1
        pen.clear()
        pen.write(f'Score : {score} High Score : {high_score}', 
            align="center", font=(None, 24, 'bold'))
    if head.distance(food) < 20:
        x = random.randint(-170, 170)
        y = random.randint(-170, 170)
        food.goto(x, y)

        # Adding segment
        new_segment = turtle.Turtle()
        new_segment.speed(0)
        new_segment.shape('square')
        new_segment.color('orange') # tail colour
        new_segment.penup()
        segments.append(new_segment)
        score += 10
        if score > high_score:
            high_score = score
        pen.clear()
        pen.write(f'Score : {score} High Score : {high_score}', align="center", 
            font=(None, 24, 'bold'))
    # Checking for head collisions with body segments
    for index in range(len(segments)-1, 0, -1):
        x = segments[index-1].xcor()
        y = segments[index-1].ycor()
        segments[index].goto(x, y)
    if len(segments) > 0:
        x = head.xcor()
        y = head.ycor()
        segments[0].goto(x, y)
    move()
    for segment in segments:
        if segment.distance(head) < 20:
            time.sleep(1)
            head.goto(0, 0)
            head.direction = 'stop'
            colors = random.choice(['red', 'blue', 'green'])
            shapes = random.choice(['square', 'circle'])
            for segment in segments:
                segment.goto(1000, 1000)
            segment.clear()

            score = 0
            delay = 0.1
            pen.clear()
            pen.write("Score : {} High Score : {} ".format(
                score, high_score), align="center", font=("candara", 24, "bold"))
    time.sleep(delay)

wn.mainloop()
```