我不能blit同一个对象多次 [英] I can't blit the same object multiple times

问题描述

我目前正在制作一个吉他英雄喜欢游戏在python，我试图 blit 一个笔记多次，但我似乎无法得到它的工作注意被称为红色）！

I am currently making a Guitar Hero like game in python and I am trying to blit a note multiple times, but I can't seem to get it to work (the note is called Red)!

#Sprite Class
class Sprite(pygame.sprite.Sprite):
    # What has to be passed when you create a sprite.
    #   image_file: The filename of the image.
    #   lacation: The initial location of where to draw the image.
    def __init__(self, image_file, location):                       
    pygame.sprite.Sprite.__init__(self) # Call Sprite initializer       
    self.image = pygame.image.load(image_file)                         
    self.rect = self.image.get_rect()                                  
    self.rect.left, self.rect.top = location
    self.xSpeed = 15 # The default xSpeed
    self.ySpeed = 15 # The default ySpeed
    self.name = "Not Assigned"
    self.speed = 10
    self.direction = 0

    def setSpeed(self, speed):
        self.speed = speed
        self.calcXYSpeeds()

    def setDirection(self, direction):
        self.direction = direction
        self.calcXYSpeeds()

    def calcXYSpeeds(self):
        angleRadians = math.radians(self.direction) # Convert the direction to radians.
        self.xSpeed= self.speed*math.cos(angleRadians)
        self.ySpeed = self.speed*math.sin(angleRadians)

    def move(self):
        self.rect = self.rect.move(self.xSpeed,self.ySpeed)

    def setDirectionTowards(self, (x,y)):
        self.direction = math.degrees(math.atan2((self.rect.x - x), (self.rect.y - y)))
        self.direction = 270 - self.direction
        self.calcXYSpeeds()

#Object Variables
Red = Sprite("Red.png", (100,25))
note1 = Sprite("note1.jpg", (50,650))
#add sprite to group
notes = pygame.sprite.Group()
notes.add(Red)
# Create an clock to keep track time
clock = pygame.time.Clock()
#Scoring Variables
font=pygame.font.Font(None,50)
score=0
score_text=font.render(str(score),1,(225,225,225))
#other Variables
Red1=0
ySpeed = 10
running = 1
while (running==1):
    # Sets the frame rate to 30 frames/second.
    clock.tick(30)

    # Gets any events like keyboard or mouse.
    event = pygame.event.poll()
    key=pygame.key.get_pressed()
    #object random spawn
    time = pygame.time.get_ticks()
    if (time==30*(random.randint(0,1000))):
        screen.blit(Red.image, Red.rect)
        pygame.display.update()

    #Object Movement
    Red.rect.y = Red.rect.y + ySpeed

    #Keys to complete notes
    if key[pygame.K_a]and Red1==0 and pygame.sprite.collide_rect(Red, note1) == True:
        font=pygame.font.Font(None,50)
        score = score+1
        score_text=font.render(str(score),1,(225,225,225))
        Red1=1
        #where i currently working to fix the problem
        notes.Group.clear(screen, background)
        notes.Group.update()
        notes.draw(screen)

    # Sets the exit flag if the X was clicked on the run window.
    if event.type == pygame.QUIT:
        running = 0

    # Color the whole screen with a solid color.
    screen.fill((0, 255, 255))
    #prints objects
    screen.blit(note1.image, note1.rect)
    screen.blit(Red.image, Red.rect)
    screen.blit(score_text,(500,50))

    # Update the window.
    pygame.display.update()

推荐答案

在每个周期清洁屏幕是一种正确的方法，但你只需要清洁一次，否则你是

Clean the screen in every cycle is a correct approach, but you need to clean only once otherwise you are erasing everything you blitted before.

此外，对于在循环之间持续的音符，您需要将它们保存在一个集合中，例如音符，这样就可以在每个循环中嵌入每个音符

Also, for notes to persist between cycles you need to keep them in a collection, like notes, that way you blit every note in every cycle.

请记住您的主循环中的顺序：

Keep in mind this order in your main loop:

1. 控制FPS （clock.tick（））


2. 检查事件


3. 更新状态（例如：添加/删除注释集合等）


4. 清除屏幕


5. 绘制当前状态（注释，静态元素等）


6. 更新显示

1. Control FPS (clock.tick())
2. Check events
3. Update state (ie: add/remove notes collection, etc)
4. Clear screen
5. Draw current state (notes, static elements, etc)
6. Update display

另一个重要的事情，不要在不同的位置使用相同的Sprite（）和相同的Rectangle。如果要在新位置绘制相同图像的另一个副本，请创建一个矩形的副本，然后创建一个新的Sprite（）对象。

Another important thing, don't use the same Sprite() nor the same Rectangle in different locations. If you want to draw another copy of the same image in a new location make a copy of the rectangle, then create a new Sprite() object.

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