#! /usr/bin/python import sys, os, pygame, random # ===================================================================== # GLOBAL VARIABLES gameScreen = None # the main display screen scrRefreshRate = 250 # the pause (in milliseconds) between updates keepPlaying = True # flag to identify if the game should continue backImage = None terrainList = [] # define the size of the pygame display window scrSize = scrWidth, scrHeight = 480,480 mapRows, mapCols = 15, 15 # the size of the map in rows by columns tilePixels = 32 defaultMap = [ ['w','w','w','w','w','w','w','w','w','w','w','w','w','w','w'], ['w','g','g','g','g','g','g','g','g','g','w','g','g','g','w'], ['w','g','w','g','g','w','w','w','w','g','w','g','w','f','w'], ['w','g','w','g','g','w','g','g','g','g','w','g','w','w','w'], ['w','g','w','w','w','w','g','w','w','w','w','g','g','g','w'], ['w','g','g','w','g','g','g','g','g','g','w','g','g','g','w'], ['w','g','g','w','g','g','g','g','l','g','w','w','w','g','w'], ['w','g','g','w','g','g','l','l','l','g','g','g','g','g','w'], ['w','g','w','w','w','w','l','l','l','l','g','g','g','g','w'], ['w','g','w','g','g','g','g','l','w','g','g','w','w','w','w'], ['w','g','w','g','g','g','g','g','w','g','g','w','g','g','w'], ['w','g','w','w','w','w','w','g','w','g','w','w','g','g','w'], ['w','g','g','g','g','w','g','g','w','g','w','w','g','w','w'], ['w','g','w','g','g','g','g','g','w','g','g','g','g','g','w'], ['w','w','w','w','w','w','w','w','w','w','w','w','w','w','w'] ] # ===================================================================== # SETUP ROUTINE # - initializes the pygame display screen and background image def gameSetup(): # specify the global variables the setup routine needs to access global gameScreen, scrSize, backImage, terrainList, mapRows, mapCols # initialize the randon number generator random.seed() # initialize the display screen pygame.init() gameScreen = pygame.display.set_mode(scrSize) backImage = pygame.image.load('backdrop.gif') gameScreen.blit(backImage, (0,0)) # now build the terrain objects from the text map, # a seperate object is created for each tile on the map r = 0 while r < mapRows: c = 0 while c < mapCols: terrainList.append(Terrain(defaultMap[r][c], r, c)) c += 1 r += 1 # ==================================================================== # TERRAIN OBJECT # terrain constitutes the background of the game map, # e.g. grass, walls, water, etc # # each terrain object has several properties: # - the image loaded for that terrain object # - the terrain object's pixel position on the display # - the terrain object's map square (row, column) # - the terrain type (grass, lake, wall) class Terrain(pygame.sprite.Sprite): # the constructor (initialization routine) def __init__(self, terrainType, r, c): # initialize a pygame sprite for the object pygame.sprite.Sprite.__init__(self) # establish the terrain attributes global tilePixels self.terrainType = terrainType self.row = r self.col = c self.position = self.x, self.y = r*tilePixels, c*tilePixels if terrainType == 'g': self.image = pygame.image.load('grass.gif') elif terrainType == 'w': self.image = pygame.image.load('wall.gif') elif terrainType == 'f': self.image = pygame.image.load('finish.gif') else: self.image = pygame.image.load('lake.gif') self.rect = self.image.get_rect() # draw the terrain global gameScreen gameScreen.blit(self.image, (self.x, self.y)) def update(self): # redraws the terrain item self.rect.topleft = self.x,self.y # ===================================================================== # CHARACTER OBJECT class Character(pygame.sprite.Sprite): # the constructor (initialization routine) def __init__(self, image, r, c, mdir, moveAlg, cid): # initialize a pygame sprite for the character pygame.sprite.Sprite.__init__(self) # record the character's unique id self.characterID = cid # load an image for the character self.image = pygame.image.load(image) self.rect = self.image.get_rect() # set up the initial position for the character, # both as a map square (row,col) # and as a display (pixel) position (x,y) global tilePixels self.mapLocation = self.row, self.col = r, c self.position = self.x, self.y = r*tilePixels, c*tilePixels # set up the initial direction for the character self.movingDir = mdir # record the movement plotting algorithm the character should use # (e.g. 'random' movement, 'clockwise' movement, etc) self.plotting = moveAlg # check for a winner (adj to finish flag) def checkForWin(self): global keepPlaying win = False if (defaultMap[self.row+1][self.col] == 'f'): win = True elif (defaultMap[self.row-1][self.col] == 'f'): win = True elif (defaultMap[self.row][self.col-1] == 'f'): win = True elif (defaultMap[self.row][self.col+1] == 'f'): win = True if win: print "***************************" print "!!!!! AI number", self.characterID, "won !!!!!" print "***************************" pygame.time.delay(2000) keepPlaying = False return True else: return False # the update routine adjusts the character's current position # and image based on its direction and the local terrain def update(self): # calculate the object's new position based on its old position, # its current direction, and the local map terrain global defaultMap, tilePixels # end the game if a character has found the flag if self.checkForWin(): return # figure out where the character should move next, # based on their plotting algorithm if (self.plotting == 'clockwise'): # characters attempting to follow the walls around the maze # should always run their plotting algorithm self.plotDirection() elif (self.plotting == 'random'): # characters using random plotting have roughly a 1/3 chance # of replotting their direction (i.e. randomly changing # which direction they're going) if (random.randint(0,100) < 34): self.plotDirection() # otherwise, characters using random plotting will try to # keep going in the same direction if possible # if their way turns out to be blocked then they'll # randomly plot a new direction elif not self.checkAndMove(self.movingDir): self.plotDirection() # position the image correctly self.rect = self.image.get_rect() self.rect.topleft = self.x,self.y = self.row*tilePixels, self.col*tilePixels # check to see if you are able to move in the specified direction (n,s,e,w) # if it is possible, i.e. if the target tile is grass, # then move, set your direction movement, and return true # otherwise return false def checkAndMove(self, d): global defaultMap if (d == 'n'): if (defaultMap[self.row-1][self.col] == 'g'): self.row -= 1 self.movingDir = 'n' return True elif (d == 's'): if (defaultMap[self.row+1][self.col] == 'g'): self.row += 1 self.movingDir = 's' return True elif (d == 'e'): if (defaultMap[self.row][self.col+1] == 'g'): self.col += 1 self.movingDir = 'e' return True elif (d == 'w'): if (defaultMap[self.row][self.col-1] == 'g'): self.col -= 1 self.movingDir = 'w' return True return False # plotDirection calculates a new facing for an AI based on # both the surrounding terrain and the AI's destination def plotDirection(self): global defaultMap # in random movement, there is an equal chance of the AI # attempting to move in each of the four directions if (self.plotting == 'random'): choice = random.randint(0,100) if (choice < 25): self.checkAndMove('n') elif (choice < 50): self.checkAndMove('e') elif (choice < 75): self.checkAndMove('w') elif (defaultMap[self.row+1][self.col] == 'g'): self.checkAndMove('s') # in clockwise movement the AI basically tries to hug the wall: # the AI tries to turn clockwise from its current facing, # but if that is blocked the AI tries to keep moving # in its old direction # if that is also blocked, # then the AI tries to turn still further # and if that is also blocked then the AI goes in # the one direction left elif (self.plotting == 'clockwise'): if (self.movingDir == 'n'): # was moving north, see if we can turn east if self.checkAndMove('e'): return # otherwise see if we can go north elif self.checkAndMove('n'): return # otherwise see if we can go west elif self.checkAndMove('w'): return # otherwise go south else: self.checkAndMove('s') elif (self.movingDir == 'e'): # was moving east, see if we can turn south if self.checkAndMove('s'): return # otherwise see if we can go east elif self.checkAndMove('e'): return # otherwise see if we can go north elif self.checkAndMove('n'): return # otherwise go west else: self.checkAndMove('w') elif (self.movingDir == 's'): # was moving south, see if we can turn west if self.checkAndMove('w'): return # otherwise see if we can go south elif self.checkAndMove('s'): return # otherwise see if we can go east elif self.checkAndMove('e'): return # otherwise go north else: self.checkAndMove('n') else: # was moving west, see if we can turn north if self.checkAndMove('n'): return # otherwise see if we can go west elif self.checkAndMove('w'): return # otherwise see if we can go south elif self.checkAndMove('s'): return # otherwise go east else: self.checkAndMove('e') # ===================================================================== # EVENT HANDLING ROUTINE # - processes any pending in-game events def processEvents(): # specify which global variables the routine needs access to global keepPlaying # process each pending event for event in pygame.event.get(): # if the user closed the window set keepPlaying to False # to tell the game to quit playing if event.type == pygame.QUIT: keepPlaying = False # check if the user has pressed a key elif event.type == pygame.KEYDOWN: # the escape and q keys quit the game if event.key == pygame.K_ESCAPE: keepPlaying = False elif event.key == pygame.K_q: keepPlaying = False # ===================================================================== # MAIN GAME CONTROL ROUTINE # - sets up the game and runs the main game update loop # until instructed to quit def main(): # identify any global variables the main routine needs to access global gameScreen, backImage, scrRefreshRate, keepPlaying # initialize pygame and the game's display screen gameSetup() # create a list of characters to add to the display, # giving each of them an image, map row, map column, # facing direction, movement plotting style, and unique id characterList = [ Character('ghost1.gif', 1, 1, 'e', 'random', 0), Character('ghost2.gif', mapCols - 2, 1, 'n', 'clockwise', 1), ] # create a group out of the list of character objects characterGroup = pygame.sprite.RenderUpdates(*characterList) # create a group out of the list of terrain objects (map tiles) terrainGroup = pygame.sprite.RenderUpdates(*terrainList) # run the main game loop keepPlaying = True while keepPlaying: # handle any pending events processEvents() # clear both the character group and the terrain group # update both groups # get a list of changed sections of the screen # as a result of changes to the characters and tiles # and redraw the display characterGroup.clear(gameScreen, backImage) terrainGroup.clear(gameScreen, backImage) characterGroup.update() terrainGroup.update() updateSections = terrainGroup.draw(gameScreen) updateSections += characterGroup.draw(gameScreen) pygame.display.update(updateSections) pygame.display.flip() # pause before initiating the next loop cycle pygame.time.delay(scrRefreshRate) # shut down the game pygame.display.quit() sys.exit() # ===================================================================== # INITIATE THE GAME # - calls the main() routine if __name__ == "__main__": main()