7.2: Source Code to Wormy
- Page ID
- 13598
\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)
This source code can be downloaded from http://invpy.com/wormy.py. If you get any error messages, look at the line number that is mentioned in the error message and check your code for any typos. You can also copy and paste your code into the web form at http://invpy.com/diff/wormy to see if the differences between your code and the code in the book.
# Wormy (a Nibbles clone) # By Al Sweigart al@inventwithpython.com # http://inventwithpython.com/pygame # Released under a "Simplified BSD" license 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 worm's 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']: # don't remove worm's tail segment apple = getRandomLocation() # set a new apple somewhere else: del wormCoords[-1] # remove worm's 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()