Python 复杂版贪食蛇（源代码）

Posted 2022-11-01

Python 复杂版贪食蛇（源代码）

简易版贪食蛇代码如下，直接运行即可。 备注：案例来源于书：Pygame游戏开发指南

1. 效果图

2. 源代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author：Zhang Kai time:2020/12/8
# (Pygame) Lead the green snake around the screen eating red apples.



import random, pygame, sys
from pygame.locals import *

FPS = 15
WINDOWWIDTH = 640
WINDOWHEIGHT = 480
CELLSIZE = 20
assert WINDOWWIDTH % CELLSIZE == 0, "Window width must be a multiple of cell size."
assert WINDOWHEIGHT % CELLSIZE == 0, "Window height must be a multiple of cell size."
CELLWIDTH = int(WINDOWWIDTH / CELLSIZE)
CELLHEIGHT = int(WINDOWHEIGHT / CELLSIZE)

#             R    G    B
WHITE     = (255, 255, 255)
BLACK     = (  0,   0,   0)
RED       = (255,   0,   0)
GREEN     = (  0, 255,   0)
DARKGREEN = (  0, 155,   0)
DARKGRAY  = ( 40,  40,  40)
BGCOLOR = BLACK

UP = up
DOWN = down
LEFT = left
RIGHT = right

HEAD = 0 # syntactic sugar: index of the worms head

def main():
    global FPSCLOCK, DISPLAYSURF, BASICFONT

    pygame.init()
    FPSCLOCK = pygame.time.Clock()
    DISPLAYSURF = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT))
    BASICFONT = pygame.font.Font(freesansbold.ttf, 18)
    pygame.display.set_caption(Wormy)

    showStartScreen()
    while True:
        runGame()
        showGameOverScreen()


def runGame():
    # Set a random start point.
    startx = random.randint(5, CELLWIDTH - 6)
    starty = random.randint(5, CELLHEIGHT - 6)
    wormCoords = [x: startx,     y: starty,
                  x: startx - 1, y: starty,
                  x: startx - 2, y: starty]
    direction = RIGHT

    # Start the apple in a random place.
    apple = getRandomLocation()

    while True: # main game loop
        for event in pygame.event.get(): # event handling loop
            if event.type == QUIT:
                terminate()
            elif event.type == KEYDOWN:
                if (event.key == K_LEFT or event.key == K_a) and direction != RIGHT:
                    direction = LEFT
                elif (event.key == K_RIGHT or event.key == K_d) and direction != LEFT:
                    direction = RIGHT
                elif (event.key == K_UP or event.key == K_w) and direction != DOWN:
                    direction = UP
                elif (event.key == K_DOWN or event.key == K_s) and direction != UP:
                    direction = DOWN
                elif event.key == K_ESCAPE:
                    terminate()

        # check if the worm has hit itself or the edge
        if wormCoords[HEAD][x] == -1 or wormCoords[HEAD][x] == CELLWIDTH or wormCoords[HEAD][y] == -1 or wormCoords[HEAD][y] == CELLHEIGHT:
            return # game over
        for wormBody in wormCoords[1:]:
            if wormBody[x] == wormCoords[HEAD][x] and wormBody[y] == wormCoords[HEAD][y]:
                return # game over

        # check if worm has eaten an apply
        if wormCoords[HEAD][x] == apple[x] and wormCoords[HEAD][y] == apple[y]:
            # dont remove worms tail segment
            apple = getRandomLocation() # set a new apple somewhere
        else:
            del wormCoords[-1] # remove worms tail segment

        # move the worm by adding a segment in the direction it is moving
        if direction == UP:
            newHead = x: wormCoords[HEAD][x], y: wormCoords[HEAD][y] - 1
        elif direction == DOWN:
            newHead = x: wormCoords[HEAD][x], y: wormCoords[HEAD][y] + 1
        elif direction == LEFT:
            newHead = x: wormCoords[HEAD][x] - 1, y: wormCoords[HEAD][y]
        elif direction == RIGHT:
            newHead = x: wormCoords[HEAD][x] + 1, y: wormCoords[HEAD][y]
        wormCoords.insert(0, newHead)
        DISPLAYSURF.fill(BGCOLOR)
        drawGrid()
        drawWorm(wormCoords)
        drawApple(apple)
        drawScore(len(wormCoords) - 3)
        pygame.display.update()
        FPSCLOCK.tick(FPS)

def drawPressKeyMsg():
    pressKeySurf = BASICFONT.render(Press a key to play., True, DARKGRAY)
    pressKeyRect = pressKeySurf.get_rect()
    pressKeyRect.topleft = (WINDOWWIDTH - 200, WINDOWHEIGHT - 30)
    DISPLAYSURF.blit(pressKeySurf, pressKeyRect)


def checkForKeyPress():
    if len(pygame.event.get(QUIT)) > 0:
        terminate()

    keyUpEvents = pygame.event.get(KEYUP)
    if len(keyUpEvents) == 0:
        return None
    if keyUpEvents[0].key == K_ESCAPE:
        terminate()
    return keyUpEvents[0].key


def showStartScreen():
    titleFont = pygame.font.Font(freesansbold.ttf, 100)
    titleSurf1 = titleFont.render(Wormy!, True, WHITE, DARKGREEN)
    titleSurf2 = titleFont.render(Wormy!, True, GREEN)

    degrees1 = 0
    degrees2 = 0
    while True:
        DISPLAYSURF.fill(BGCOLOR)
        rotatedSurf1 = pygame.transform.rotate(titleSurf1, degrees1)
        rotatedRect1 = rotatedSurf1.get_rect()
        rotatedRect1.center = (WINDOWWIDTH / 2, WINDOWHEIGHT / 2)
        DISPLAYSURF.blit(rotatedSurf1, rotatedRect1)

        rotatedSurf2 = pygame.transform.rotate(titleSurf2, degrees2)
        rotatedRect2 = rotatedSurf2.get_rect()
        rotatedRect2.center = (WINDOWWIDTH / 2, WINDOWHEIGHT / 2)
        DISPLAYSURF.blit(rotatedSurf2, rotatedRect2)

        drawPressKeyMsg()

        if checkForKeyPress():
            pygame.event.get() # clear event queue
            return
        pygame.display.update()
        FPSCLOCK.tick(FPS)
        degrees1 += 3 # rotate by 3 degrees each frame
        degrees2 += 7 # rotate by 7 degrees each frame


def terminate():
    pygame.quit()
    sys.exit()


def getRandomLocation():
    return x: random.randint(0, CELLWIDTH - 1), y: random.randint(0, CELLHEIGHT - 1)


def showGameOverScreen():
    gameOverFont = pygame.font.Font(freesansbold.ttf, 150)
    gameSurf = gameOverFont.render(Game, True, WHITE)
    overSurf = gameOverFont.render(Over, True, WHITE)
    gameRect = gameSurf.get_rect()
    overRect = overSurf.get_rect()
    gameRect.midtop = (WINDOWWIDTH / 2, 10)
    overRect.midtop = (WINDOWWIDTH / 2, gameRect.height + 10 + 25)

    DISPLAYSURF.blit(gameSurf, gameRect)
    DISPLAYSURF.blit(overSurf, overRect)
    drawPressKeyMsg()
    pygame.display.update()
    pygame.time.wait(500)
    checkForKeyPress() # clear out any key presses in the event queue

    while True:
        if checkForKeyPress():
            pygame.event.get() # clear event queue
            return

def drawScore(score):
    scoreSurf = BASICFONT.render(Score: %s % (score), True, WHITE)
    scoreRect = scoreSurf.get_rect()
    scoreRect.topleft = (WINDOWWIDTH - 120, 10)
    DISPLAYSURF.blit(scoreSurf, scoreRect)


def drawWorm(wormCoords):
    for coord in wormCoords:
        x = coord[x] * CELLSIZE
        y = coord[y] * CELLSIZE
        wormSegmentRect = pygame.Rect(x, y, CELLSIZE, CELLSIZE)
        pygame.draw.rect(DISPLAYSURF, DARKGREEN, wormSegmentRect)
        wormInnerSegmentRect = pygame.Rect(x + 4, y + 4, CELLSIZE - 8, CELLSIZE - 8)
        pygame.draw.rect(DISPLAYSURF, GREEN, wormInnerSegmentRect)


def drawApple(coord):
    x = coord[x] * CELLSIZE
    y = coord[y] * CELLSIZE
    appleRect = pygame.Rect(x, y, CELLSIZE, CELLSIZE)
    pygame.draw.rect(DISPLAYSURF, RED, appleRect)


def drawGrid():
    for x in range(0, WINDOWWIDTH, CELLSIZE): # draw vertical lines
        pygame.draw.line(DISPLAYSURF, DARKGRAY, (x, 0), (x, WINDOWHEIGHT))
    for y in range(0, WINDOWHEIGHT, CELLSIZE): # draw horizontal lines
        pygame.draw.line(DISPLAYSURF, DARKGRAY, (0, y), (WINDOWWIDTH, y))


if __name__ == __main__:
    main()