滚动极限

Question

我目前正在参加一个A级计算机科学课程，在其中，我必须为一个项目创建一个游戏。我知道这段代码可能效率不高，但我试图让它与我自己的工作保持一致，我想要一只有两位的手，而我的手有点卡住了。

这段代码目前从一个介绍性屏幕开始，一旦进入游戏，就会在玩家从屏幕上掉下来时向左滚动、向右滚动并移除生命。当所有的生命丧失时，屏幕上就会显示一个游戏。

我想知道是否有办法对滚动屏幕设置一个限制，以便当玩家离开时，它停止在某个点滚动，并停止在屏幕边缘的球员，以阻止他们从屏幕上掉下来。我想把最左边的底部平台设为边缘，这就迫使玩家往右走。

另一个小问题是，如果有任何方法可以减少滞后。

如果有更多的信息需要帮助

import pygame as pg
import time
import random


pg.init()#initiates pygame

display_height = 690#Creates width and height of screen
display_width = 1024

#Colours
white = (255,255,255) 
black = (0,0,0)
red = (255,0,0)
green = (0,255,0)
blue = (0,0,255)
grass = (24,85,36)
yellow = (255,255,0)
lightGrey = (184,184,184)
grey = (73,71,65)

Robot_height = 99#Height of robot
Robot_width = 112#Width of robot
Bullet_Fired = False
PowerUp_Active = False
Robot_acc = 0.3 #Robot Acceleration
vec = pg.math.Vector2

gameDisplay = pg.display.set_mode((display_width,display_height)) #Sets display properties of window
pg.display.set_caption ("Game") #Title on window
clock = pg.time.Clock()
robotImg = pg.image.load("robot1.png") #Loads robots image
lifeImg = pg.image.load("Life.png")#Loads image from folder
lifeImg = pg.transform.scale(lifeImg, (80, 80))#Sets dimensions of image
backgroundImg = pg.image.load("Background.png")#Loads background image
backgroundImg = pg.transform.scale(backgroundImg, (display_width, display_height))#Sets dimensions of background to fit the screen
inBackgroundImg = pg.image.load("IntroBackground1.png")#Loads intro background
controlsImg = pg.image.load("controls.png")#Loads controls screen background
controlsImg = pg.transform.scale(controlsImg, (display_width, display_height))#Sets dimensions to fit screen
largeText = pg.font.Font("Font.ttf",77)#Large text set
smallText = pg.font.Font("Font.ttf",32)#Small text set

#Class for platforms
class Platform(pg.sprite.Sprite):
    def __init__(self, x,y,w,h):
        pg.sprite.Sprite.__init__(self)
        self.image = pg.Surface((w,h))#sets width and height of platform
        self.image.fill(grass)#Fills rectangle with blue
        self.rect = self.image.get_rect()#Rectangle set
        self.rect.x = x#x position
        self.rect.y = y#y position

#List of platforms
PLATFORM_LIST = [[0,display_height - 40,display_width,40],
                 [display_width + 300,display_height - 40,display_width,40],
                 [display_width /2 - 50,display_height * 3/4,100,20],
                 [display_width -10,display_height * 3/4,100,20]]
#Platform group
platforms = pg.sprite.Group()

#Checks through "PLATFORM_LIST" and adds all the platforms the the grounp "platforms"
for plat in PLATFORM_LIST:
    p = Platform(*plat)
    platforms.add(p)

#Draws platforms to the screen
def draw():
    for plat in platforms:
        pg.draw.rect(gameDisplay, grass, plat)

#Class for robot
class RobotClass(pg.sprite.Sprite):
    def __init__(self):
        pg.sprite.Sprite.__init__(self)
        self.image = pg.Surface((Robot_width,Robot_height))#Height and width of the robot
        self.rect = self.image.get_rect()#Gets rectangle of robot
        self.rect.center = (display_width / 2, display_height / 2)#Location of center of robot
        self.RobotPos = vec(display_width / 2, display_height / 2)#Position of robot as vector
        self.bottom = (0,0)#Bottom of robot
        self.vel = vec(0, 0)#Robots velocity
        self.acc = vec(0, 0.3)#Robots Acceleration

startX = display_width/2
startY = display_height/2

#Creates Robot
Robot = RobotClass()

#Jump function
def jump():
    #Checks pixel below robot to see if there is a collision
    Robot.rect.x = Robot.rect.x +1
    hits = pg.sprite.spritecollide(Robot , platforms, False)
    Robot.rect.x = Robot.rect.x -1
    if hits:
        #Gives robot velocity of 5 upwards
        Robot.vel.y = -10

#Settings for text
def text_objects(text, font):
    textSurface = font.render(text, True, white)
    return textSurface, textSurface.get_rect()

#Displays lives of Robot
def display_lives(lives):
    global lifeImg
    TextSurf, TextRect = text_objects("Lives:", smallText)#Sets text and font
    TextRect.topleft = (1,16)#Places text in top left of screen
    gameDisplay.blit(TextSurf, TextRect) #displays text
    if lives == 3:#Displays 3 spanners
        gameDisplay.blit(lifeImg,(110,0))
        gameDisplay.blit(lifeImg,(160,0))
        gameDisplay.blit(lifeImg,(210,0))
    if lives == 2:#Displays 2 spanners
        gameDisplay.blit(lifeImg,(110,0))
        gameDisplay.blit(lifeImg,(160,0))
    if lives == 1:#Displays 1 spanners
        gameDisplay.blit(lifeImg,(110,0))
    if lives == 0:#Should end game when all lives are lost
        game_over()

#Function for button that takes parameters (message,x,y,height,width,active colour,inactive colour,text size,action)      
def button(msg,x,y,w,h,i,a,t,action=None):
    mouse = pg.mouse.get_pos() #Gets (x,y) position of mouse
    Text = pg.font.Font("Font.ttf",t) #Lets text size be input
    click = pg.mouse.get_pressed() #Gets whenther mouse has been clicked (mouse1,middle mouse,mouse2)

    if x+w > mouse[0] > x and y+50 > mouse[1] > y:#Checks to see if mouse is within boundaries of button
        pg.draw.rect(gameDisplay, a,(x,y,w,h),5)#Changes color of box when being hovered over
        if click[0] == 1 and action != None:#If mouse1 is clicked and there is an action to be performed it will be run
            action()#action is parameter and the () is used to initiate function
    else:
        pg.draw.rect(gameDisplay, i,(x,y,w,h),5)#Sets default button

    TextSurf, TextRect = text_objects(msg, Text)#Runs text_objects with inputted parameter of the message
    TextRect.center = ((x+(w/2)),(y+(h/2)))#Places text inside the button
    gameDisplay.blit(TextSurf, TextRect)#Displays text


def Exit():#Used for button on intro screen to exit
    pg.quit()
    quit()

#What happens when player runs out of lives
def game_over():
    while True:
        for event in pg.event.get():#lets window be closed
            if event.type == pg.QUIT:
                pg.quit()
                quit()
        gameDisplay.blit(inBackgroundImg, (0, 0))
        TextSurf, TextRect = text_objects(("Game"), largeText)#Places large text on screen
        TextRect.center = ((display_width/2+10),(180))#location of text
        gameDisplay.blit(TextSurf, TextRect)
        TextSurf, TextRect = text_objects(("Over"), largeText)
        TextRect.center = ((display_width/2+10),(280))
        gameDisplay.blit(TextSurf, TextRect)
        pg.draw.rect(gameDisplay, yellow,(290,125,445,220),5)#Puts yellow box over game over

        button("Retry",410,600,207,70,yellow,lightGrey,45,game_loop)
        button("Quit",display_width-105,display_height-55,100,50,yellow,lightGrey,33,Exit)

        pg.display.update()#updates screen
        clock.tick(15)

#Function for control screen
def controls():
    while True:
        for event in pg.event.get():#lets window be closed
            if event.type == pg.QUIT:
                pg.quit()
                quit()
        gameDisplay.blit(controlsImg, (0, 0))#Places controlsImg on screen
        button("Back",5,display_height-55,100,50,black,grey,30,game_intro)#places back button in bottom left corner

        pg.display.update()#updates screen
        clock.tick(15)#sets clock rate


#Function to gun the intro screen
def game_intro():
    while True:
        for event in pg.event.get():#lets window be closed
            if event.type == pg.QUIT:
                pg.quit()
                quit()
        gameDisplay.blit(inBackgroundImg, (0, 0))#Places background image
        TextSurf, TextRect = text_objects(("Lost on planet X"), largeText)#Places large text on screen
        TextRect.center = ((display_width/2),(200))#location of text
        gameDisplay.blit(TextSurf, TextRect)#displays text
        pg.draw.rect(gameDisplay, yellow,(65,130,900,150),5)#Puts yellow box over title

        button("Play",412,550,200,50,yellow,lightGrey,36,game_loop) #Play button at middle bottom
        button("Controls",412,450,200,50,yellow,lightGrey,32,controls) #Controls button in middle of screen
        button("Quit",display_width-105,display_height-55,100,50,yellow,lightGrey,33,Exit) #Quit button in bottom right


        pg.display.update()#updates screen
        clock.tick(15)#sets clock rate

#game loop
def game_loop():
    global PLATFORM_LIST
    global startX
    global startY
    global backgroundImg
    Robot.RobotPos = (startX,startY)
    lives = 3 #Robot Lives
    Robot_friction = -0.3 #Friction value
    vec = pg.math.Vector2 #Setting vec as vector quantity
    while True:
        for event in pg.event.get():
            if event.type == pg.QUIT:
                pg.quit
                quit()
            #Starts acceleration when key is pressed
            if event.type == pg.KEYDOWN:
                if event.key == pg.K_LEFT:
                    Robot.acc.x = -Robot_acc
                elif event.key == pg.K_RIGHT:
                    Robot.acc.x = Robot_acc
                elif event.key == pg.K_UP:
                    jump()
            #Adds friction to accleration to slow robot down when key is not being pressed
            if event.type == pg.KEYUP:
                if event.key == pg.K_LEFT or event.key == pg.K_RIGHT:
                    Robot.acc.x = Robot.acc.x * Robot_friction

        #Adjusts velocity of robot by adding the acceleration on each cycle
        Robot.vel = Robot.vel+ Robot.acc
        #gameDisplay.fill(sky)
        gameDisplay.blit(backgroundImg,(0,0))
        #Draws the platforms to the screen and adds them to platform group
        draw()
        #Changes Robot position according to its velocity,acceleration and the friction
        Robot.RobotPos = Robot.RobotPos + Robot.vel + 0.5 * Robot.acc
        #Loads robot onto screen
        gameDisplay.blit(robotImg,(Robot.rect))
        #pg.draw.rect(gameDisplay, red, Robot.rect, 2
        display_lives(lives)#lives
        pg.display.update()#Updates display
        clock.tick(60)

        #Sets bottom of robot to its position
        Robot.rect.midbottom =  Robot.RobotPos

        #Collision detection
        if Robot.vel.y > 0:
            hits = pg.sprite.spritecollide(Robot , platforms, False)
            if hits:
                #Puts Robot on top of platform
                Robot.RobotPos.y = hits[0].rect.top + 1
                Robot.vel.y = 0        
        #Scrolling
        if Robot.rect.left < display_width/4:
            Robot.RobotPos.x = Robot.RobotPos.x + abs(Robot.vel.x)
            startX = startX + abs(Robot.vel.x)
            for plat in platforms:
                plat.rect.x = plat.rect.x + int(abs(Robot.vel.x))
                draw()
        if Robot.rect.right > (display_width-display_width/4):
            Robot.RobotPos.x = Robot.RobotPos.x - abs(Robot.vel.x)
            startX = startX - abs(Robot.vel.x)
            for plat in platforms:
                plat.rect.x = plat.rect.x - int(abs(Robot.vel.x))
                draw()

        #Losing a life
        if Robot.rect.top > display_height:
            lives = lives - 1
            Robot.RobotPos.y = Robot.RobotPos.y - (40+Robot_height)
            Robot.RobotPos.x = Robot.RobotPos.x - 200
            Robot.vel.x = 0


        #Sets top velocity of robot    
        if Robot.vel.x > 6:
            Robot.vel.x = 6
        if Robot.vel.x < -6:
            Robot.vel.x = -6
        #Makes robot velocity = 0 when it is close to 0
        if Robot.vel.x < 0.05 and Robot.vel.x > -0.05:
            Robot.acc.x = 0
            Robot.vel.x = 0

game_intro()
pg.quit()
quit()

Answer 1

我自己设法完成了这个问题，所以我会简要地解释一下我做了什么。

我添加了一个名为off的变量，它跟踪滚动屏幕离原始位置有多远。

offset = 0

然后，我将这个变量添加到滚动代码中。

if Robot.rect.left < display_width/4:
            Robot.RobotPos.x = Robot.RobotPos.x + abs(Robot.vel.x)
            startX = startX + int(abs(Robot.vel.x))
            offset = offset + int(abs(Robot.vel.x))
            for plat in platforms:
                plat.rect.x = plat.rect.x + int(abs(Robot.vel.x))
            for coin in coins:
                coin.rect.x = coin.rect.x + int(abs(Robot.vel.x))

if Robot.rect.right > (display_width-display_width/4):
            Robot.RobotPos.x = Robot.RobotPos.x - abs(Robot.vel.x)
            startX = startX - int(abs(Robot.vel.x))
            offset = offset - int(abs(Robot.vel.x))
            for plat in platforms:
                plat.rect.x = plat.rect.x - int(abs(Robot.vel.x))
            for coin in coins:
                coin.rect.x = coin.rect.x - int(abs(Robot.vel.x))

然后，我在这个函数中添加了一个额外的if。这只在偏移量小于零时才从代码中运行滚动部分。任何大于零的值都表示屏幕已向左偏移。因此，这段代码只允许在不处于屏幕边缘的时候滚动。

if offset > 0:
            pass
elif Robot.rect.left < display_width/4:
            Robot.RobotPos.x = Robot.RobotPos.x + abs(Robot.vel.x)
            startX = startX + int(abs(Robot.vel.x))
            offset = offset + int(abs(Robot.vel.x))
            for plat in platforms:
                plat.rect.x = plat.rect.x + int(abs(Robot.vel.x))
            for coin in coins:
                coin.rect.x = coin.rect.x + int(abs(Robot.vel.x))

为了防止精灵从屏幕上掉下来，我使用我的平台函数在边缘添加了一堵墙，并将其添加到一个组中，以防以后需要使用更多的墙壁。

w1 = Platform(0,0,10,display_height)
wall = pg.sprite.Group()
wall.add(w1)

在此之后，我创建了一个使用spritecollide检查雪碧是否接触到墙壁的条件。

hit = pg.sprite.spritecollide(Robot , wall,False)
        if hit:
            Robot.vel.x = 0
            Robot.acc.x = 0

虽然这起作用，但出现了一个问题，即精灵很难离开墙壁，因为它的速度一直被设置为0，所以我添加了另一个变量，以检查左箭头是否被按下。

hit = pg.sprite.spritecollide(Robot , wall,False)
        if hit:
            if left == True:
                Robot.vel.x = 0
                Robot.acc.x = 0

这样，只有当您试图向左移动时，才会重置值。

if event.type == pg.KEYDOWN:
                if event.key == pg.K_LEFT:
                    Robot.acc.x = -Robot_acc
                    left = True
                elif event.key == pg.K_RIGHT:
                    Robot.acc.x = Robot_acc                  
                elif event.key == pg.K_UP:
                    jump()
            elif Robot.acc.x < 0:
                left = True
            else:
                left = False 

下面是我所有的代码，以防我遗漏了任何东西，或者有不同的部分需要查看。

*编辑此代码当前不滚动或显示墙壁。滚动并不重要，因为当机器人滚动时，它应该在屏幕的中央，所以墙壁仍然在那里，但是没有办法与它相撞，它是看不见的，所以你看不到它。

如果我没有很好地解释一个部分，或者你只是想要一些更多的信息，那就随便问吧。

import pygame as pg
import time
import random


pg.init()#initiates pygame

display_height = 690#Creates width and height of screen
display_width = 1024

#Colours
white = (255,255,255) 
black = (0,0,0)
red = (255,0,0)
green = (0,255,0)
blue = (0,0,255)
grass = (24,85,36)
yellow = (255,255,0)
lightGrey = (184,184,184)
grey = (73,71,65)
brown = (66, 40, 13) 

Robot_height = 99#Height of robot
Robot_width = 112#Width of robot
Bullet_Fired = False
PowerUp_Active = False
Robot_acc = 0.3 #Robot Acceleration
vec = pg.math.Vector2

gameDisplay = pg.display.set_mode((display_width,display_height)) #Sets display properties of window
pg.display.set_caption ("Game") #Title on window
clock = pg.time.Clock()
robotImg = pg.image.load("robot1.png") #Loads robots image
lifeImg = pg.image.load("Life.png")#Loads image from folder
lifeImg = pg.transform.scale(lifeImg, (80, 80))#Sets dimensions of image
backgroundImg = pg.image.load("Background.png")#Loads background image
backgroundImg = pg.transform.scale(backgroundImg, (display_width, display_height))#Sets dimensions of background to fit the screen
inBackgroundImg = pg.image.load("IntroBackground1.png")#Loads intro background
controlsImg = pg.image.load("controls.png")#Loads controls screen background
controlsImg = pg.transform.scale(controlsImg, (display_width, display_height))#Sets dimensions to fit screen
largeText = pg.font.Font("Font.ttf",77)#Large text set
smallText = pg.font.Font("Font.ttf",32)#Small text set

#Class for platforms
class Platform(pg.sprite.Sprite):
    def __init__(self, x,y,w,h):
        pg.sprite.Sprite.__init__(self)
        self.image = pg.Surface((w,h))#sets width and height of platform
        self.image.fill(grass)#Fills rectangle with blue
        self.rect = self.image.get_rect()#Rectangle set
        self.rect.x = x#x position
        self.rect.y = y#y position

#List of platforms x , y , width , height
PLATFORM_LIST = [[-5,display_height - 40,2005,40],
                 [2300,display_height - 40,1000,40],
                 [1100,display_height - 190,300,20],
                 ]
#Platform group
platforms = pg.sprite.Group()

w1 = Platform(0,0,10,display_height)
wall = pg.sprite.Group()
wall.add(w1)

#Checks through "PLATFORM_LIST" and adds all the platforms the the grounp "platforms"
for plat in PLATFORM_LIST:
    p = Platform(*plat)
    platforms.add(p)

#Draws platforms to the screen
def draw():
    for plat in platforms:
        pg.draw.rect(gameDisplay, grass, plat)

#Class for robot
class RobotClass(pg.sprite.Sprite):
    def __init__(self):
        pg.sprite.Sprite.__init__(self)
        self.image = pg.Surface((Robot_width,Robot_height))#Height and width of the robot
        self.rect = self.image.get_rect()#Gets rectangle of robot
        self.rect.center = (display_width / 2, display_height / 2)#Location of center of robot
        self.RobotPos = vec(display_width / 2, display_height / 2)#Position of robot as vector
        self.bottom = (0,0)#Bottom of robot
        self.vel = vec(0, 0)#Robots velocity
        self.acc = vec(0, 0.3)#Robots Acceleration

startX = display_width/2
startY = display_height/2

#Creates Robot
Robot = RobotClass()

#Jump function
def jump():
    #Checks pixel below robot to see if there is a collision
    Robot.rect.x = Robot.rect.x +1
    hits = pg.sprite.spritecollide(Robot , platforms, False)
    Robot.rect.x = Robot.rect.x -1
    if hits:
        #Gives robot velocity of 5 upwards
        Robot.vel.y = -10

#Settings for text
def text_objects(text, font):
    textSurface = font.render(text, True, white)
    return textSurface, textSurface.get_rect()

#Displays lives of Robot
def display_lives(lives):
    global lifeImg
    TextSurf, TextRect = text_objects("Lives:", smallText)#Sets text and font
    TextRect.topleft = (1,16)#Places text in top left of screen
    gameDisplay.blit(TextSurf, TextRect) #displays text
    if lives == 3:#Displays 3 spanners
        gameDisplay.blit(lifeImg,(110,0))
        gameDisplay.blit(lifeImg,(160,0))
        gameDisplay.blit(lifeImg,(210,0))
    if lives == 2:#Displays 2 spanners
        gameDisplay.blit(lifeImg,(110,0))
        gameDisplay.blit(lifeImg,(160,0))
    if lives == 1:#Displays 1 spanners
        gameDisplay.blit(lifeImg,(110,0))
    if lives == 0:#Should end game when all lives are lost
        game_over()

#Displays score in top right of screen and takes in parameter score
def display_score(score):
    #Displays the score itself
    TextSurf, TextRect = text_objects(str(score), smallText)#Sets text and font
    TextRect.topleft = (display_width-120,16)#Places text in top left of screen
    gameDisplay.blit(TextSurf, TextRect)

    #Displays the text "score" infront of the score
    TextSurf, TextRect = text_objects("Score:", smallText)#Sets text and font
    TextRect.topleft = (display_width-255,16)#Places text in top left of screen
    gameDisplay.blit(TextSurf, TextRect)

#Function for button that takes parameters (message,x,y,height,width,active colour,inactive colour,text size,action)      
def button(msg,x,y,w,h,i,a,t,action=None):
    mouse = pg.mouse.get_pos() #Gets (x,y) position of mouse
    Text = pg.font.Font("Font.ttf",t) #Lets text size be input
    click = pg.mouse.get_pressed() #Gets whenther mouse has been clicked (mouse1,middle mouse,mouse2)

    if x+w > mouse[0] > x and y+50 > mouse[1] > y:#Checks to see if mouse is within boundaries of button
        pg.draw.rect(gameDisplay, a,(x,y,w,h),5)#Changes color of box when being hovered over
        if click[0] == 1 and action != None:#If mouse1 is clicked and there is an action to be performed it will be run
            action()#action is parameter and the () is used to initiate function
    else:
        pg.draw.rect(gameDisplay, i,(x,y,w,h),5)#Sets default button

    TextSurf, TextRect = text_objects(msg, Text)#Runs text_objects with inputted parameter of the message
    TextRect.center = ((x+(w/2)),(y+(h/2)))#Places text inside the button
    gameDisplay.blit(TextSurf, TextRect)#Displays text


def Exit():#Used for button on intro screen to exit
    pg.quit()
    quit()

#What happens when player runs out of lives
def game_over():
    while True:
        for event in pg.event.get():#lets window be closed
            if event.type == pg.QUIT:
                pg.quit()
                quit()
        gameDisplay.blit(inBackgroundImg, (0, 0))
        TextSurf, TextRect = text_objects(("Game"), largeText)#Places large text on screen
        TextRect.center = ((display_width/2+10),(180))#location of text
        gameDisplay.blit(TextSurf, TextRect)
        TextSurf, TextRect = text_objects(("Over"), largeText)
        TextRect.center = ((display_width/2+10),(280))
        gameDisplay.blit(TextSurf, TextRect)
        pg.draw.rect(gameDisplay, yellow,(290,125,445,220),5)#Puts yellow box over game over

        button("Retry",410,600,207,70,yellow,lightGrey,45,game_loop)
        button("Quit",display_width-105,display_height-55,100,50,yellow,lightGrey,33,Exit)

        pg.display.update()#updates screen
        clock.tick(15)

#Function for control screen
def controls():
    while True:
        for event in pg.event.get():#lets window be closed
            if event.type == pg.QUIT:
                pg.quit()
                quit()
        gameDisplay.blit(controlsImg, (0, 0))#Places controlsImg on screen
        button("Back",5,display_height-55,100,50,black,grey,30,game_intro)#places back button in bottom left corner

        pg.display.update()#updates screen
        clock.tick(15)#sets clock rate


#Function to gun the intro screen
def game_intro():
    while True:
        for event in pg.event.get():#lets window be closed
            if event.type == pg.QUIT:
                pg.quit()
                quit()
        gameDisplay.blit(inBackgroundImg, (0, 0))#Places background image
        TextSurf, TextRect = text_objects(("Lost on planet X"), largeText)#Places large text on screen
        TextRect.center = ((display_width/2),(200))#location of text
        gameDisplay.blit(TextSurf, TextRect)#displays text
        pg.draw.rect(gameDisplay, yellow,(65,130,900,150),5)#Puts yellow box over title

        button("Play",412,550,200,50,yellow,lightGrey,36,game_loop) #Play button at middle bottom
        button("Controls",412,450,200,50,yellow,lightGrey,32,controls) #Controls button in middle of screen
        button("Quit",display_width-105,display_height-55,100,50,yellow,lightGrey,33,Exit) #Quit button in bottom right


        pg.display.update()#updates screen
        clock.tick(15)#sets clock rate

#game loop
def game_loop():
    left = False
    offset = 0
    global PLATFORM_LIST
    global startX
    global startY
    global backgroundImg
    Robot.RobotPos = (startX,startY)
    score = 0 #Score
    lives = 3 #Robot Lives
    Robot_friction = -0.3 #Friction value
    vec = pg.math.Vector2 #Setting vec as vector quantity
    while True:
        for event in pg.event.get():
            if event.type == pg.QUIT:
                pg.quit
                quit()
            #Starts acceleration when key is pressed
            if event.type == pg.KEYDOWN:
                if event.key == pg.K_LEFT:
                    Robot.acc.x = -Robot_acc
                    left = True
                elif event.key == pg.K_RIGHT:
                    Robot.acc.x = Robot_acc                  
                elif event.key == pg.K_UP:
                    jump()
            elif Robot.acc.x < 0:
                left = True
            else:
                left = False 

            print(left)
            #Adds friction to accleration to slow robot down when key is not being pressed
            if event.type == pg.KEYUP:
                if event.key == pg.K_LEFT or event.key == pg.K_RIGHT:
                    Robot.acc.x = Robot.acc.x * Robot_friction

        #Adjusts velocity of robot by adding the acceleration on each cycle
        Robot.vel = Robot.vel+ Robot.acc
        #gameDisplay.fill(sky)
        gameDisplay.blit(backgroundImg,(0,0))
        #Changes Robot position according to its velocity,acceleration and the friction
        Robot.RobotPos = Robot.RobotPos + Robot.vel + 0.5 * Robot.acc
        #Loads robot onto screen
        gameDisplay.blit(robotImg,(Robot.rect))
        #pg.draw.rect(gameDisplay, red, Robot.rect, 2
        display_lives(lives)
        display_score(score)#lives

        #Sets bottom of robot to its position
        Robot.rect.midbottom =  Robot.RobotPos

        #Collision detection
        if Robot.vel.y > 0:
            hits = pg.sprite.spritecollide(Robot , platforms, False)
            if hits:
                if Robot.RobotPos.y < hits[0].rect.bottom:
                    #Puts Robot on top of platform
                    Robot.RobotPos.y = hits[0].rect.top + 1
                    Robot.vel.y = 0

        hit = pg.sprite.spritecollide(Robot , wall,False)
        if hit:
            if left == True:
                Robot.vel.x = 0
                Robot.acc.x = 0
            else:
                pass

        #Scrolling
        if offset > 0:
            pass
        elif Robot.rect.left < display_width/4:
            Robot.RobotPos.x = Robot.RobotPos.x + abs(Robot.vel.x)
            startX = startX + int(abs(Robot.vel.x))
            offset = offset + int(abs(Robot.vel.x))
            for plat in platforms:
                plat.rect.x = plat.rect.x + int(abs(Robot.vel.x))

        if Robot.rect.right > (display_width-display_width/4):
            Robot.RobotPos.x = Robot.RobotPos.x - abs(Robot.vel.x)
            startX = startX - int(abs(Robot.vel.x))
            offset = offset - int(abs(Robot.vel.x))
            for plat in platforms:
                plat.rect.x = plat.rect.x - int(abs(Robot.vel.x))

        draw()

        #Losing a life
        if Robot.rect.top > display_height:
            lives = lives - 1
            Robot.RobotPos.y = Robot.RobotPos.y - (40+Robot_height)
            Robot.RobotPos.x = Robot.RobotPos.x - 200
            Robot.vel.x = 0


        #Sets top velocity of robot    
        if Robot.vel.x > 6:
            Robot.vel.x = 6
        if Robot.vel.x < -6:
            Robot.vel.x = -6
        #Makes robot velocity = 0 when it is close to 0
        if Robot.vel.x < 0.05 and Robot.vel.x > -0.05:
            Robot.acc.x = 0
            Robot.vel.x = 0

        pg.display.update()#Updates display
        clock.tick(60)

game_intro()
pg.quit()
quit()