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contrib/mini-projects/SnakeGame.markdown

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+---
+jupyter:
+  colab:
+  kernelspec:
+    display_name: Python 3
+    name: python3
+  language_info:
+    name: python
+  nbformat: 4
+  nbformat_minor: 0
+---
+
+::: {.cell .code colab="{\"base_uri\":\"https://localhost:8080/\"}" id="hOfFUL-BmVYE" outputId="2816bbdc-5ba6-4696-8ae1-2fd67638bfd7"}
+``` python
+from tkinter import *
+import random
+
+W,H=600,400
+B=20
+
+class Snake(Tk) :
+    def __init__(self):
+        super().__init__()
+        self.title("Snake Game")
+        self.geometry(f"{W}x{H}")
+        self.canvas =Canvas(self,bg="black")
+        self.canvas.pack(fill="both",expand=True)
+        self.Points=0
+        self.snake = [(100, 100), (80, 100), (60, 100)]
+        self.direction ="Right"
+        self.food=self.create_food()
+
+        self.bind("<KeyPress>", self.key_press)
+        self.update_snake()
+
+
+    def create_food(self):
+
+
+        x = random.randint(0, (W - B) // B) * B
+        y = random.randint(0, (H - B) // B) * B
+
+
+
+
+        self.food=self.canvas.create_oval(x, y, x + B, y + B, fill="white")
+        return x,y
+
+
+
+    def move_snake(self):
+        x,y = self.snake[0]
+        if self.direction == "Right":
+            x+=B
+        elif self.direction == "Left" :
+            x-=B
+        elif self.direction == "Up":
+            y-=B
+        elif self.direction == "Down":
+            y+=B
+        self.snake= [(x,y)] + self.snake[:-1]
+
+        if (x, y) == self.food  :
+
+            self.canvas.delete(self.food)
+            self.Points+=1
+            self.food = self.create_food()
+
+
+
+
+
+    def draw_snake(self):
+        for x,y in self.snake :
+            self.canvas.create_rectangle(x,y,x+B,y+B,fill="green")
+
+    def collision(self):
+        x, y = self.snake[0]
+
+
+        if x < 0 or x >= W or y < 0 or y >= H:
+            return True
+
+
+        for segment in self.snake[1:]:
+
+            if (x, y) == segment:
+                return True
+
+        return False
+
+
+    def key_press(self,event):
+        key=event.keysym
+        if key == "Right" and self.direction != "Left":
+            self.direction="Right"
+        elif key=="Left" and self.direction !="Right":
+            self.direction ="Left"
+        elif key =="Up" and self.direction!="Down":
+            self.direction = "Up"
+        elif key =="Down" and self.direction!="Up":
+            self.direction = "Down"
+
+    def update_snake(self):
+        self.draw_snake()
+        self.move_snake()
+        if self.collision():
+            self.gameover()
+            return
+        self.after(150,self.update_snake)
+    def gameover(self):
+        self.canvas.create_text(W/2,H/2,text=f"Game Over!  Won {self.Points}",fill="white",font=("Arial",24))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+if __name__ == "__main__":
+    game=Snake()
+    game.mainloop()
+```
+
+::: {.output .stream .stdout}
+    hi
+:::
+:::