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snake.py
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snake.py
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import curses
import time
import sys
from random import randint
class Field:
def __init__(self, size):
self.size = size
self.icons = {
0: ' ',
1: '░░',
2: '▒▒',
3: '▓▓',
}
self.snake_coords = []
self._generate_field()
self.add_entity()
def add_entity(self):
while(True):
i = randint(0, self.size-1)
j = randint(0, self.size-1)
entity = [i, j]
if entity not in self.snake_coords:
self.field[i][j] = 3
break
def _generate_field(self):
self.field = [[0 for j in range(self.size)] for i in range(self.size)]
def _clear_field(self):
self.field = [[j if j!= 1 and j!= 2 else 0 for j in i] for i in self.field]
def render(self, screen):
size = self.size
self._clear_field()
# Render snake on the field
for i, j in self.snake_coords:
self.field[i][j] = 1
# Mark head
head = self.snake_coords[-1]
self.field[head[0]][head[1]] = 2
for i in range(size):
row = ''
for j in range(size):
row += self.icons[ self.field[i][j] ]
screen.addstr(i, 0, row)
def get_entity_pos(self):
for i in range(self.size):
for j in range(self.size):
if self.field[i][j] == 3:
return [i, j]
return [-1, -1]
def is_snake_eat_entity(self):
entity = self.get_entity_pos()
head = self.snake_coords[-1]
return entity == head
class Snake:
def __init__(self, name):
self.name = name
self.direction = curses.KEY_RIGHT
# Init basic coords
self.coords = [[0, 0], [0, 1], [0, 2], [0, 3]]
def set_direction(self, ch):
# Check if wrong direction
if ch == curses.KEY_LEFT and self.direction == curses.KEY_RIGHT:
return
if ch == curses.KEY_RIGHT and self.direction == curses.KEY_LEFT:
return
if ch == curses.KEY_UP and self.direction == curses.KEY_DOWN:
return
if ch == curses.KEY_DOWN and self.direction == curses.KEY_UP:
return
self.direction = ch
def level_up(self):
# get last point direction
a = self.coords[0]
b = self.coords[1]
tail = a[:]
if a[0] < b[0]:
tail[0]-=1
elif a[1] < b[1]:
tail[1]-=1
elif a[0] > b[0]:
tail[0]+=1
elif a[1] > b[1]:
tail[1]+=1
tail = self._check_limit(tail)
self.coords.insert(0, tail)
def is_alive(self):
head = self.coords[-1]
snake_body = self.coords[:-1]
return head not in snake_body
def _check_limit(self, point):
# Check field limit
if point[0] > self.field.size-1:
point[0] = 0
elif point[0] < 0:
point[0] = self.field.size-1
elif point[1] < 0:
point[1] = self.field.size-1
elif point[1] > self.field.size-1:
point[1] = 0
return point
def move(self):
# Determine head coords
head = self.coords[-1][:]
# Calc new head coords
if self.direction == curses.KEY_UP:
head[0]-=1
elif self.direction == curses.KEY_DOWN:
head[0]+=1
elif self.direction == curses.KEY_RIGHT:
head[1]+=1
elif self.direction == curses.KEY_LEFT:
head[1]-=1
# Check field limit
head = self._check_limit(head)
del(self.coords[0])
self.coords.append(head)
self.field.snake_coords = self.coords
if not self.is_alive():
sys.exit('You died.')
# check if snake eat an entity
if self.field.is_snake_eat_entity():
curses.beep()
self.level_up()
self.field.add_entity()
def set_field(self, field):
self.field = field
def main(screen):
# Configure screen
screen.timeout(0)
# Init snake & field
field = Field(16)
snake = Snake("Joe")
snake.set_field(field)
while(True):
# Get last pressed key
ch = screen.getch()
if ch != -1:
# If some arrows did pressed - change direction
snake.set_direction(ch)
# Move snake
snake.move()
# Render field
field.render(screen)
screen.refresh()
time.sleep(.2)
if __name__=='__main__':
curses.wrapper(main)