Pygame: How do i make Fruits fall randomly without them getting struck on screen?

Question

Hey i am trying to make fruit catcher game in python using pygame but the fruits somehow get struck on screen(screenshot attached).The fruits and basket are getting screeched on the screen. I have also tried adding user defined events but then also the fruits images are getting screeched on the output screen. Can someone tell me what I am doing wrong?

import pygame
import time,random,sys
from pygame.locals import *

screenWidth=800
screenHeight=600

pygame.init()

screen=pygame.display.set_mode((screenWidth,screenHeight))
pygame.display.set_caption("Fruit Catcher")

white=(255,255,255)
black=(0,0,0)
red=(255,0,0)

pygame.mixer.init()

clock=pygame.time.Clock()

font=pygame.font.SysFont("City Blueprint",50)
smallfont=pygame.font.SysFont("City Blueprint",20)


class Basket(pygame.sprite.Sprite):
    def __init__(self):
        super(Basket,self).__init__()
        self.image=pygame.image.load("basket.png").convert_alpha()
        self.image=pygame.transform.scale(self.image,(100,70))
        self.rect=self.image.get_rect()
        self.rect.x=0
        self.rect.y=screenHeight-100
    def update(self,pressed_keys):
        if pressed_keys[K_LEFT]:
            self.rect.move_ip(-5,0)
        if pressed_keys[K_RIGHT]:
            self.rect.move_ip(5,0)
        if self.rect.left<0:
            self.rect.left=0
        if self.rect.right>screenWidth:
            self.rect.right=screenWidth


class Fruits(pygame.sprite.Sprite):
    def __init__(self,img):
        super(Fruits,self).__init__()
        self.image=pygame.image.load(img).convert_alpha()
        self.image=pygame.transform.scale(self.image,(20,20))
        self.rect=self.image.get_rect()
        self.rect.x=random.randrange(screenWidth)
        self.rect.y=0
        self.speed=random.randint(1,7)
    def update(self):
        self.rect.y+=self.speed
        if self.rect.bottom>screenHeight:
            self.kill()

fruitsgroup=pygame.sprite.Group()
allsprites=pygame.sprite.Group()

fruits=["apple.png","guava.png","strawberry.png"]

def createBasket():
    basket=Basket()
    allsprites.add(basket)
    return basket

def createFruits():
    fruit=Fruits(random.choice(fruits))
    fruitsgroup.add(fruit)
    allsprites.add(fruit)
    return fruit

def start():
    screen.blit(pygame.image.load("background.jpg"),(0,0))
    fruitsgroup.empty()
    allsprites.empty()
    basket=createBasket()
    while True:
        for event in pygame.event.get():
            if event.type==QUIT:
                return
        
        pressedkeys=pygame.key.get_pressed()
        basket.update(pressedkeys)
        fruitsgroup.update()
        if random.randrange(100)<2:
            createFruits()
        allsprites.draw(screen)
        clock.tick(30)
        pygame.display.update()
        

start()
pygame.quit()

does this helps: https://stackoverflow.com/questions/66251296/pygame-image-smudging-leaving-a-trail-on-the-screen? — Pygirl, May 27 '21 at 07:57

score 1 · Answer 1 · answered May 27 '21 at 08:14

Credit: https://stackoverflow.com/a/44686333/6660373 You need to add background before updating your fruits and basket. add these two lines:

    screen.fill((0,0,0)) 
    screen.blit(pygame.image.load("background.jpg"),(0,0))

def start():
    screen.blit(pygame.image.load("background.jpg"),(0,0))
    fruitsgroup.empty()
    allsprites.empty()
    basket=createBasket()
    while True:
        for event in pygame.event.get():
            if event.type==QUIT:
                return

        screen.fill((0,0,0)) # <--------------- here
        screen.blit(pygame.image.load("background.jpg"),(0,0)) #<-----------here
        
        pressedkeys=pygame.key.get_pressed()

Rabbid76 · Accepted Answer · 2021-05-27T08:21:09.197

You have to clear the display or draw the background in the application loop. Loading an image is a very time consuming operation. Load the background image once before the application loop, but blit it continuously in the loop:

def start():
    
    # load and scale background
    background = pygame.image.load("background.jpg"))
    background = pygame.transform.scale(background, (screenWidth,screenHeight))
    
    fruitsgroup.empty()
    allsprites.empty()
    basket=createBasket()
    while True:
        for event in pygame.event.get():
            if event.type==QUIT:
                return
        
        pressedkeys=pygame.key.get_pressed()
        basket.update(pressedkeys)
        fruitsgroup.update()
        if random.randrange(100)<2:
            createFruits()
        
        # clear screen / draw background
        screen.blit(background, (0, 0))
        
        allsprites.draw(screen)
        pygame.display.update()
        clock.tick(30)

The typical PyGame application loop has to:

handle the events by either pygame.event.pump() or pygame.event.get().
update the game states and positions of objects dependent on the input events and time (respectively frames)
clear the entire display or draw the background
draw the entire scene (blit all the objects)
update the display by either pygame.display.update() or pygame.display.flip()
limit the frames per second to limit CPU usage with pygame.time.Clock.tick

Yeah i got it ! tHanks a lot! – Kinjal Thacker May 27 '21 at 11:34 — Kinjal Thacker, May 27 '21 at 11:34

Pygame: How do i make Fruits fall randomly without them getting struck on screen?

2 Answers2