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environment.py
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# Snake: Deep Convolutional Q-Learning - Environment file
import numpy as np
import pygame as pg
class Environment():
def __init__(self, waitTime):
self.width = 880
self.height = 880
self.nRows = 10
self.nColumns = 10
self.initSnakeLen = 2
self.defReward = -0.03
self.negReward = -1.
self.posReward = 2.
self.waitTime = waitTime
if self.initSnakeLen > self.nRows / 2:
self.initSnakeLen = int(self.nRows / 2)
self.screen = pg.display.set_mode((self.width, self.height))
self.snakePos = list()
self.screenMap = np.zeros((self.nRows, self.nColumns))
for i in range(self.initSnakeLen):
self.snakePos.append((int(self.nRows / 2) + i, int(self.nColumns / 2)))
self.screenMap[int(self.nRows / 2) + i][int(self.nColumns / 2)] = 0.5
self.applePos = self.placeApple()
self.drawScreen()
self.collected = False
self.lastMove = 0
def placeApple(self):
posx = np.random.randint(0, self.nColumns)
posy = np.random.randint(0, self.nRows)
while self.screenMap[posy][posx] == 0.5:
posx = np.random.randint(0, self.nColumns)
posy = np.random.randint(0, self.nRows)
self.screenMap[posy][posx] = 1
return (posy, posx)
def drawScreen(self):
self.screen.fill((0, 0, 0))
cellWidth = self.width / self.nColumns
cellHeight = self.height / self.nRows
for i in range(self.nRows):
for j in range(self.nColumns):
if self.screenMap[i][j] == 0.5:
pg.draw.rect(self.screen, (255, 255, 255), (j*cellWidth + 1, i*cellHeight + 1, cellWidth - 2, cellHeight - 2))
elif self.screenMap[i][j] == 1:
pg.draw.rect(self.screen, (255, 0, 0), (j*cellWidth + 1, i*cellHeight + 1, cellWidth - 2, cellHeight - 2))
pg.display.flip()
def moveSnake(self, nextPos, col):
self.snakePos.insert(0, nextPos)
if not col:
self.snakePos.pop(len(self.snakePos) - 1)
self.screenMap = np.zeros((self.nRows, self.nColumns))
for i in range(len(self.snakePos)):
self.screenMap[self.snakePos[i][0]][self.snakePos[i][1]] = 0.5
if col:
self.applePos = self.placeApple()
self.collected = True
self.screenMap[self.applePos[0]][self.applePos[1]] = 1
def step(self, action):
# action = 0 -> up
# action = 1 -> down
# action = 2 -> right
# action = 3 -> left
gameOver = False
reward = self.defReward
self.collected = False
for event in pg.event.get():
if event.type == pg.QUIT:
return
snakeX = self.snakePos[0][1]
snakeY = self.snakePos[0][0]
if action == 1 and self.lastMove == 0:
action = 0
if action == 0 and self.lastMove == 1:
action = 1
if action == 3 and self.lastMove == 2:
action = 2
if action == 2 and self.lastMove == 3:
action = 3
if action == 0:
if snakeY > 0:
if self.screenMap[snakeY - 1][snakeX] == 0.5:
gameOver = True
reward = self.negReward
elif self.screenMap[snakeY - 1][snakeX] == 1:
reward = self.posReward
self.moveSnake((snakeY - 1, snakeX), True)
elif self.screenMap[snakeY - 1][snakeX] == 0:
self.moveSnake((snakeY - 1, snakeX), False)
else:
gameOver = True
reward = self.negReward
elif action == 1:
if snakeY < self.nRows - 1:
if self.screenMap[snakeY + 1][snakeX] == 0.5:
gameOver = True
reward = self.negReward
elif self.screenMap[snakeY + 1][snakeX] == 1:
reward = self.posReward
self.moveSnake((snakeY + 1, snakeX), True)
elif self.screenMap[snakeY + 1][snakeX] == 0:
self.moveSnake((snakeY + 1, snakeX), False)
else:
gameOver = True
reward = self.negReward
elif action == 2:
if snakeX < self.nColumns - 1:
if self.screenMap[snakeY][snakeX + 1] == 0.5:
gameOver = True
reward = self.negReward
elif self.screenMap[snakeY][snakeX + 1] == 1:
reward = self.posReward
self.moveSnake((snakeY, snakeX + 1), True)
elif self.screenMap[snakeY][snakeX + 1] == 0:
self.moveSnake((snakeY, snakeX + 1), False)
else:
gameOver = True
reward = self.negReward
elif action == 3:
if snakeX > 0:
if self.screenMap[snakeY][snakeX - 1] == 0.5:
gameOver = True
reward = self.negReward
elif self.screenMap[snakeY][snakeX - 1] == 1:
reward = self.posReward
self.moveSnake((snakeY, snakeX - 1), True)
elif self.screenMap[snakeY][snakeX - 1] == 0:
self.moveSnake((snakeY, snakeX - 1), False)
else:
gameOver = True
reward = self.negReward
self.drawScreen()
self.lastMove = action
pg.time.wait(self.waitTime)
return self.screenMap, reward, gameOver
def reset(self):
self.screenMap = np.zeros((self.nRows, self.nColumns))
self.snakePos = list()
for i in range(self.initSnakeLen):
self.snakePos.append((int(self.nRows / 2) + i, int(self.nColumns / 2)))
self.screenMap[int(self.nRows / 2) + i][int(self.nColumns / 2)] = 0.5
self.screenMap[self.applePos[0]][self.applePos[1]] = 1
self.lastMove = 0
self.drawScreen()
if __name__ == '__main__':
env = Environment(100)
gameOver = False
start = False
action = 0
while True:
for event in pg.event.get():
if event.type == pg.KEYDOWN:
if event.key == pg.K_SPACE and not start:
start = True
elif event.key == pg.K_SPACE and start:
start = False
if event.key == pg.K_UP:
action = 0
elif event.key == pg.K_DOWN:
action = 1
elif event.key == pg.K_RIGHT:
action = 2
elif event.key == pg.K_LEFT:
action = 3
if start:
_, _, gameOver = env.step(action)
if gameOver:
start = False
gameOver = False
env.reset()
action = 0