好的，所以当我开始游戏时，滚动背景会在介绍文字后消失。 有任何想法吗？我做了两次blit屏幕！滚动图像是一个gif。它被称为ocean.gif并被评论，它在第15行
""" Import al the necessary classes/sprites and pygame libs """
import pygame
from sys import exit
from LaserSprite import Laser
from PlayerShipSprite import PlayerShip
from EnenySprite import Asteroid
from Vector_Calc import Vector
from CursorSprite import Cursor
from ScoreBoardSprite import ScoreBoard
import math
""" Set up the screen size and sound mixer """
pygame.init()
screen = pygame.display.set_mode((640, 480))
pygame.mixer.init()
b1 = "ocean1.gif" //scrolling background
back = pygame.image.load(b1)
back2 = pygame.image.load(b1)
h = 0
screenWidth = 640
""" This function updates the score board with
information retrieved from the player class """
def updateScoreBoard(RefreshScore):
(ship, scoreBoard) = RefreshScore
scoreBoard.text = ("Score: %d Fired: %d Shield: %d" %(ship.Get_Score(),ship.Get_Ammo(),ship.Get_Shield()))
""" This function updates the position of the ship on the
screen based on what keys are pressed """
def checkKeys(myData):
(event, ship) = myData
if event.key == pygame.K_LEFT:
print 'LEFT'
ship.MoveLeft()
if event.key == pygame.K_RIGHT:
print 'RIGHT'
ship.MoveRight()
if event.key == pygame.K_UP:
ship.MoveUp()
print 'UP'
if event.key == pygame.K_DOWN:
print 'DOWN'
ship.MoveDown()
""" This is the main game loop, when the game is over the player will
be returned to the introduction screen """
def game():
""" Set up the title of the game, the background size, color and then
blit to the screen """
pygame.display.set_caption("Asteroids Version 2.0")
background = pygame.Surface(screen.get_size())
background.fill((0, 0, 0))
screen.blit(background, (0, 0))
""" Set the mouse cursor to be hidden """
pygame.mouse.set_visible(False)
""" Create a new instance of a player and cursor, here
I have set up the cursor as a class the will be updated during the game """
ship = PlayerShip(screen)
cursor = Cursor()
""" Create a new instance of the ScoreBoard class, this is then
given a text value and a position on the screen. Pay note
as to how the score, ammo and shield are retrieved from the PlayerShip class"""
scoreBoard = ScoreBoard()
scoreBoard.text = ("Score: %d Fired: %d Shield: %d" %(ship.Get_Score(),ship.Get_Ammo(),ship.Get_Shield()))
scoreBoard.center = (320,470)
""" Create empty sprite groups as shown below """
all_sprites_list = pygame.sprite.Group()
laser_list = pygame.sprite.Group()
asteroid_list = pygame.sprite.Group()
""" Create 20 asteroids and add them to the asteroid list group """
for i in range(10):
asteroid = Asteroid()
asteroid_list.add(asteroid)
""" Add the ship, cursor, asteroid list group and the scoreBoard to the
all sprites list. In doing this we can have the transparent effect some
were looking for """
all_sprites_list.add(ship)
all_sprites_list.add(cursor)
all_sprites_list.add(asteroid_list)
all_sprites_list.add(scoreBoard)
""" Set up the refresh rate and key repeat for the game"""
clock = pygame.time.Clock()
pygame.key.set_repeat(10,10)
keepGoing = True
while keepGoing:
clock.tick(30)
""" Check for any events - keyboard, mouse etc. """
for event in pygame.event.get():
if event.type == pygame.QUIT:
keepGoing = False
if event.type == pygame.KEYDOWN:
""" If a key is pressed, bundle the event and the ship
and pass it to the function that handles events """
myData = (event, ship)
checkKeys(myData)
if event.type == pygame.MOUSEBUTTONDOWN:
""" If a mouse event occurs check to see if it is the left click """
if event.button==1:
""" reduce the ammo of the ship
get the center of the ship sprite
get where the mouse was clicked on the screen
bundle the (x,y) position for the above
pass them to PlotVector function and have the
angle and vector returned
create a new instance a laser
pass to it the start position, angle and vector it must travel
add the laser to the laser_list group and the all sprites group """
ship.Set_Ammo();
shipCenter = ship.returnPosition()
mousePos = pygame.mouse.get_pos()
print "Ship: %s, Mouse: %s " %(shipCenter, mousePos)
data= (shipCenter, mousePos)
angle, vect = PlotVector(data)
laser = Laser()
laser.fire.play()
laser.AnglePoints(shipCenter, angle, vect)
laser_list.add(laser)
all_sprites_list.add(laser)
""" update all sprites """
all_sprites_list.update()
""" For every laser that was fired we are going to do the following: """
for laser in laser_list:
""" Create a list of asteroids that were hit by the laser """
asteroid_hit_list = pygame.sprite.spritecollide(laser, asteroid_list, False)
""" For each asteroid hit,
Update the ship score
play a bang sound
reset the asteroid to the top of the screen again
remove the laser from the laser list and all sprites """
for asteroid in asteroid_hit_list:
ship.Set_Score()
asteroid.bang.play()
asteroid.reset()
laser_list.remove(laser)
all_sprites_list.remove(laser)
""" Remove the laser if it flies up off the screen """
if laser.rect.y < -10 or laser.rect.y > screen.get_height():
laser_list.remove(laser)
all_sprites_list.remove(laser)
if laser.rect.x < -10 or laser.rect.x > screen.get_width():
laser_list.remove(laser)
all_sprites_list.remove(laser)
""" Now we are going to create a list of asteroids that hit the ship """
asteroid_hit_Ship = pygame.sprite.spritecollide(ship, asteroid_list, False)
""" For each asteroid that hits the ship,
Update the ship shields
play a bang sound
reset the asteroid to the top of the screen again """
for asteroid in asteroid_hit_Ship:
asteroid.bang.play()
ship.Set_Shield()
asteroid.reset()
""" if the ship's shields are less than 0 then the game will finish """
if ship.Get_Shield()<0:
keepGoung=False
break
""" Update the score and refresh the scoreboard using the updateScoreBoard function """
RefreshScore = (ship, scoreBoard)
updateScoreBoard(RefreshScore)
screen.blit(background, (0, 0))
""" The last part refreshes the sprites """
asteroid_list.clear(screen, background)
asteroid_list.update()
asteroid_list.draw(screen)
all_sprites_list.clear(screen, background)
all_sprites_list.update()
all_sprites_list.draw(screen)
pygame.display.flip()
return ship.Get_Score()
def PlotVector(PlotVect):
"""
This PlotVector function handles the calculation of the new
vector and also the calculation of the angle the arrow/bullet/projectile
will be transformed and travel to.
REFER TO YOUR NOTES FROM LECTURE 5
"""
""" Un-bundle the data that is passed into this function """
(start, dest) = PlotVect
""" Create a new Vector object and call it vect """
vect = Vector()
""" Pass the start and dest coordinates and get back a new vector which the arrow must travel """
vect = Vector.from_points(start, dest)
""" Calculate the magnitude (Distance) between the two points """
mag = vect.get_magnitude()
""" Get the values for the vector, i.e. the change in x and change in y """
x = vect.x
y = vect.y
""" This variable will be used to calculate and store the angle between points """
angDEG = (math.atan2(y, x)*(180/math.pi))*-1
""" Print the coordinates and angle to the screen for testing """
print "Start: %s \nEnd: %s\nVector: %s\nMagnitude: %d" %(start, dest, vect, mag)
print "Angle : %d" %(angDEG)
""" Bundle and return the angle and vector which will be used in the TheArrow Sprite """
return (angDEG, vect)
"""
The next if statement runs the main function as it is in the primary program scope.
This was covered in lecture 5 available on Moodle
"""
def instructions(score):
shipIntro = PlayerShip(screen)
allSprites = pygame.sprite.Group(shipIntro)
insFont = pygame.font.SysFont(None, 30)
instructions = (
"Fly around the field and fire to hit the ",
"asteroids but be careful not to fly too close",
"to any asteroids. Your ship has a limited amount of ",
"off shielding and if your shielding drops below ",
"0 your done for",
"good luck!",
"",
"click to start, escape to quit..."
)
insLabels = []
for line in instructions:
tempLabel = insFont.render(line, 1, (255, 255, 0))
insLabels.append(tempLabel)
keepGoing = True
clock = pygame.time.Clock()
pygame.mouse.set_visible(False)
while keepGoing:
clock.tick(30)
for event in pygame.event.get():
if event.type == pygame.QUIT:
keepGoing = False
donePlaying = True
if event.type == pygame.MOUSEBUTTONDOWN:
keepGoing = False
donePlaying = False
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
keepGoing = False
donePlaying = True
h=0
screen.blit(back,(h,0))
screen.blit(back2, (h-screenWidth,0))
h = h + 1
if h == screenWidth:
h = 0
allSprites.update()
allSprites.draw(screen)
for i in range(len(insLabels)):
screen.blit(insLabels[i], (50, 30*i))
pygame.display.flip()
pygame.mouse.set_visible(True)
return donePlaying
def main():
donePlaying = False
score = 0
while not donePlaying:
donePlaying = instructions(score)
if not donePlaying:
score = game()
if __name__ == "__main__":
main()
答案 0 :(得分：0)
看起来你有两个游戏循环：一个在def game()下，一个在def instructions()下。只有back或back2（包含ocean1.gif图像的表面）的唯一位置是instructions()循环。一旦退出，并且控制权在def game()下的游戏循环中，那些表面就不会再次出现。