PyGame - pohyb hada – Python – Fórum – Programujte.com

Zdravim,robim momentalne 2D hada podla tutorialu na YT,no narazil som na vec ktorej tak uplne nerozumiem kedze v tychto 2D hrach som pomerne zaciatocnik ...Cely kod :  

import pygame
import random
import time
pygame.init() #init pygame-u
 
display_width=800 #sirka displeja
display_height=600 #vyska displeja
 
red=(255,0,0)  #inicializacia farieb
black=(0,0,0)   #inicializacia farieb
white=(255,255,255) #inicializacia farieb
green=(0,255,0)
 
FPS=30 #fps
 
 
 
stranaRect=10 #velkost strany stvorca 
block_size=10 #o kolko sa pohne
 
pOkraj=display_width-stranaRect #ohranicenie
lOkraj=0                        #ohranicenie 
dOkraj=display_height-stranaRect  #ohranicenie
hOkraj=0                    #ohranicenie
 
font=pygame.font.SysFont(None,25)
clock=pygame.time.Clock() #kvoli nastavenu FPS
 
gameDisplay=pygame.display.set_mode((display_width,display_height)) #nastavenie velkosti okna
pygame.display.set_caption("Snakis") # nadpis okna
 
 
def snake(block_size,snakelist):
    for XnY in snakelist:  #snakelist[0]=X ,snakelist[1]=Y
        pygame.draw.rect(gameDisplay,green,(XnY[0],XnY[1],stranaRect,stranaRect))
    
 
def message_to_screen(msg,color):  #vypis textu
    screen_text=font.render(msg,True,color)
    gameDisplay.blit(screen_text,[display_width/2,display_height/2])
 
def gameLoop(): #hlavna LOOP
    randAppleX=round(random.randrange(0,display_width-block_size)/10.0)*10.0 #zaokruhlenie na desiatky
    randAppleY=round(random.randrange(0,display_height-block_size)/10.0)*10.0 #suradnice pre jablko
    
    lead_x=display_width/2      #startovacie suradnice hada
    lead_y=display_height/2        #startovacie suradnice hada
    
    lead_x_change=0   #premenne na posuvanie hada aj bez drzania klavesy
    lead_y_change=0

    snakelist=[]
    snakeLength=5
    
    gameExit=False
    gameOver=False
    while not gameExit:
        while gameOver==True:
            gameDisplay.fill(white)
            message_to_screen("Game over press C to play again or Q to quit",red)
            pygame.display.update()
            for event in pygame.event.get():
                if event.type==pygame.KEYDOWN:
                    if event.key==pygame.K_q: #ak stlaci Q vypne
                        gameExit=True
                        gameOver=False
                    if event.key==pygame.K_c: #ak stlaci C pokracuje odznova
                        gameLoop()
 
        
        for event in pygame.event.get():  #loop eventami
            
            if event.type==pygame.QUIT:  #ak stlaci krizik
                gameExit=True
            if event.type==pygame.KEYDOWN:   #ak stlaci klavesu
                if event.key==pygame.K_LEFT:    #ak je to sipka dolava etc.
                    
                    lead_x_change =- block_size
                    lead_y_change=0 #aby sa nehybal diagonalne
 
                elif event.key==pygame.K_RIGHT:
                    lead_x_change = block_size
                    lead_y_change=0 #aby sa nehybal diagonalne
 
                elif event.key==pygame.K_UP:
                    lead_y_change = -block_size
                    lead_x_change=0 #aby sa nehybal diagonalne
 
                elif event.key==pygame.K_DOWN:
                    lead_y_change=block_size
                    lead_x_change=0 #aby sa nehybal diagonalne
 
        if lead_x>pOkraj or lead_x<0 or lead_y>dOkraj or lead_y<0: #kontroluje ohranicenie
            gameOver=True
        
 
       
        lead_x+=lead_x_change
        lead_y+=lead_y_change
 
 
        
        gameDisplay.fill(white)   #nastav pozadie na bielo
        pygame.draw.rect(gameDisplay,red,(randAppleX,randAppleY,block_size,block_size)) #kreslenie jablk
 
        
        snakeHead=[]
        snakeHead.append(lead_x)
        snakeHead.append(lead_y)
        snakelist.append(snakeHead)
        print ("Len snake list   ",len(snakelist))
        print("Snakelist[0]   ",snakelist[0])
        print ("Snakelist     ",snakelist)

        if len(snakelist) > snakeLength:
            del snakelist[0]
        
        snake(block_size,snakelist) #vykreslenie hada
        
     
        pygame.display.update()#update okna
 
        if lead_x==randAppleX and lead_y==randAppleY: #ak had zje jablko
            randAppleX=round(random.randrange(0,display_width-block_size)/10.0)*10.0
            randAppleY=round(random.randrange(0,display_height-block_size)/10.0)*10.0
            
        clock.tick(FPS) #nastavenie FPS
    pygame.quit()
    quit()
        
gameLoop()

a ide o ten pohyb toho hada ze ked s nim hybem tak ako je mozne ze ked zmenim smer tak sa proste tak pekne "zlomi" ako v normalnej hre ? :-) konkretne ide o  

def snake(block_size,snakelist):
    for XnY in snakelist:  #snakelist[0]=X ,snakelist[1]=Y
        pygame.draw.rect(gameDisplay,green,(XnY[0],XnY[1],stranaRect,stranaRect))


snakelist=[]
snakeLength=5

snakeHead=[]
snakeHead.append(lead_x)
snakeHead.append(lead_y)
snakelist.append(snakeHead)


if len(snakelist) > snakeLength:
    del snakelist[0]
        
snake(block_size,snakelist) #vykreslenie hada

Ďakujem za pomoc :-))

#1 Pararam
Ahoj, v tom seznamu se ukládá seznam poloh jednotlivých částí hada. Když se had pohne, tak se na konec seznamu přidá pozice hlavy a pokud had nic nesežral, tak se smaže první pozice v seznamu (ocas hada). A zalomování se provádí takto: had zahne nahoru -> hlava = [pozice_x, pozice_y-1]; doprava -> hlava = [pozice_x+1, pozice_y] a tak dál

Jo aha diky:-)) mohol by si mi pomoct este s jednou vecou v pygame?:)

#3 Pararam
Jasně, o co jde? :)