Welcome folks today in this blog post we will be building a 2d snake game in tkinter using pygamelibrary. All the full source code of the application is shown below.
Get Started
In order to get started you need to install the following libraries using the pip command as shown below
pip install pygame
After installing this library you need to make an app.py file and copy paste the following code
app.py
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import math import random import pygame import random import tkinter as tk from tkinter import messagebox width = 500 height = 500 cols = 25 rows = 20 class cube(): rows = 20 w = 500 def __init__(self, start, dirnx=1, dirny=0, color=(255,0,0)): self.pos = start self.dirnx = dirnx self.dirny = dirny # "L", "R", "U", "D" self.color = color def move(self, dirnx, dirny): self.dirnx = dirnx self.dirny = dirny self.pos = (self.pos[0] + self.dirnx, self.pos[1] + self.dirny) def draw(self, surface, eyes=False): dis = self.w // self.rows i = self.pos[0] j = self.pos[1] pygame.draw.rect(surface, self.color, (i*dis+1,j*dis+1,dis-2,dis-2)) if eyes: centre = dis//2 radius = 3 circleMiddle = (i*dis+centre-radius,j*dis+8) circleMiddle2 = (i*dis + dis -radius*2, j*dis+8) pygame.draw.circle(surface, (0,0,0), circleMiddle, radius) pygame.draw.circle(surface, (0,0,0), circleMiddle2, radius) class snake(): body = [] turns = {} def __init__(self, color, pos): #pos is given as coordinates on the grid ex (1,5) self.color = color self.head = cube(pos) self.body.append(self.head) self.dirnx = 0 self.dirny = 1 def move(self): for event in pygame.event.get(): if event.type == pygame.QUIT: pygame.quit() keys = pygame.key.get_pressed() for key in keys: if keys[pygame.K_LEFT]: self.dirnx = -1 self.dirny = 0 self.turns[self.head.pos[:]] = [self.dirnx,self.dirny] elif keys[pygame.K_RIGHT]: self.dirnx = 1 self.dirny = 0 self.turns[self.head.pos[:]] = [self.dirnx,self.dirny] elif keys[pygame.K_UP]: self.dirny = -1 self.dirnx = 0 self.turns[self.head.pos[:]] = [self.dirnx,self.dirny] elif keys[pygame.K_DOWN]: self.dirny = 1 self.dirnx = 0 self.turns[self.head.pos[:]] = [self.dirnx,self.dirny] for i, c in enumerate(self.body): p = c.pos[:] if p in self.turns: turn = self.turns[p] c.move(turn[0], turn[1]) if i == len(self.body)-1: self.turns.pop(p) else: c.move(c.dirnx,c.dirny) def reset(self,pos): self.head = cube(pos) self.body = [] self.body.append(self.head) self.turns = {} self.dirnx = 0 self.dirny = 1 def addCube(self): tail = self.body[-1] dx, dy = tail.dirnx, tail.dirny if dx == 1 and dy == 0: self.body.append(cube((tail.pos[0]-1,tail.pos[1]))) elif dx == -1 and dy == 0: self.body.append(cube((tail.pos[0]+1,tail.pos[1]))) elif dx == 0 and dy == 1: self.body.append(cube((tail.pos[0],tail.pos[1]-1))) elif dx == 0 and dy == -1: self.body.append(cube((tail.pos[0],tail.pos[1]+1))) self.body[-1].dirnx = dx self.body[-1].dirny = dy def draw(self, surface): for i,c in enumerate(self.body): if i == 0: c.draw(surface, True) else: c.draw(surface) def redrawWindow(): global win win.fill((0,0,0)) drawGrid(width, rows, win) s.draw(win) snack.draw(win) pygame.display.update() pass def drawGrid(w, rows, surface): sizeBtwn = w // rows x = 0 y = 0 for l in range(rows): x = x + sizeBtwn y = y +sizeBtwn pygame.draw.line(surface, (255,255,255), (x, 0),(x,w)) pygame.draw.line(surface, (255,255,255), (0, y),(w,y)) def randomSnack(rows, item): positions = item.body while True: x = random.randrange(1,rows-1) y = random.randrange(1,rows-1) if len(list(filter(lambda z:z.pos == (x,y), positions))) > 0: continue else: break return (x,y) def main(): global s, snack, win win = pygame.display.set_mode((width,height)) s = snake((255,0,0), (10,10)) s.addCube() snack = cube(randomSnack(rows,s), color=(0,255,0)) flag = True clock = pygame.time.Clock() while flag: pygame.time.delay(50) clock.tick(10) s.move() headPos = s.head.pos if headPos[0] >= 20 or headPos[0] < 0 or headPos[1] >= 20 or headPos[1] < 0: print("Score:", len(s.body)) s.reset((10, 10)) if s.body[0].pos == snack.pos: s.addCube() snack = cube(randomSnack(rows,s), color=(0,255,0)) for x in range(len(s.body)): if s.body[x].pos in list(map(lambda z:z.pos,s.body[x+1:])): print("Score:", len(s.body)) s.reset((10,10)) break redrawWindow() main() |
Now if you execute the python script by typing the below command as shown below
python app.py
