添加一些代码后游戏速度变慢pygame

如何解决添加一些代码后游戏速度变慢pygame

这是我一直在开发的游戏的代码。

添加 textcode() 函数使我的整个游戏运行非常缓慢。

有什么问题？ 我几乎可以肯定没有内存瓶颈，因为运行这个程序时内存使用率约为 50%。

import pygame
import random
import math

# for initialising pygame (req for every pygame app)
pygame.init()

# making the basic window (dimensions must be written inside a tuple )
screen = pygame.display.set_mode((500,500))

# background
background = pygame.image.load('C:/Users/aryan/Downloads/background.jpg')

# load and set the logo
logo = pygame.image.load('C:/Users/aryan/Downloads/bp.png')  # directory of logo
pygame.display.set_icon(logo)
pygame.display.set_caption("space wars")  # program name

# define a variable to control the main loop
running = True

# player
playerimg = pygame.image.load('C:/Users/aryan/Downloads/spaceship.png')
playerX = 218  # x and y coordinates of image
playerY = 350
playerxchange = 0  # this will be the change in movement in x direction of our image
playerychange = 0  # this will be the change in movement in y direction of our image


def player(x,y):
    screen.blit(playerimg,(x,y))  # blit draws our image on the surface(basically the background)
    # Syntax for blit(imagename,(xcoordinate,ycoordinate))


# enemy
enemyimg = pygame.image.load('C:/Users/aryan/Downloads/enemy.png')
enemyX = random.randint(0,476)
enemyY = random.randint(0,30)
enemyxchange = 0.2
enemyychange = 40

# game over
overimg = pygame.image.load('C:/Users/aryan/Downloads/gameover.png')

# bullet
bulletimg = pygame.image.load('C:/Users/aryan/Downloads/bullet.png')
bulletX = 0
bulletY = 350
bulletxchange = 0
bulletychange = 1
bullet_state = "ready"              # "ready" you cant see bullet on screen
                                    # "fire" you can see bullet firing

bullets = []                        # bullets is a list that contains the coordinates of every bullet

score = 0

def enemy(x,y):
    screen.blit(enemyimg,ycoordinate))


def firebullet(x,y):
    global bullet_state
    bullet_state = "ready"
    bullets.append([x + 12,y + 6]) # Creating a new bullet


def iscollision(enemyX,enemyY,bulletX,bulletY):
    distance = math.sqrt(math.pow(enemyX-bulletX,2)+ math.pow(enemyY-bulletY,2))     # distance formula
    if distance <= 20:
        return True
    else:
        return False

def Textscore(game):
    text = pygame.font.SysFont(None,30)
    text2 = text.render("Your score is: " + str(game),True,(37,97,188))
    screen.blit(text2,(10,45))



# main loop
while running:
    screen.fill((120,120,120))  # in order (r,g,b) . (0,0) is black (255,0) is red...
    screen.blit(background,(0,0))
    # event handling,gets all event from the event queue
    for event in pygame.event.get():
        # only do something if the event is of type QUIT
        if event.type == pygame.QUIT:
            # change the value to False,to exit the main loop
            running = False

        # checking keystroke
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                playerxchange += 0.3  # change in movement will be 0.2 towards the right
            if event.key == pygame.K_LEFT:
                playerxchange -= 0.3  # change in movement will be 0.2 towards the right
            if event.key == pygame.K_UP:
                playerychange -= 0.3
            if event.key == pygame.K_DOWN:
               playerychange += 0.3
            if event.key == pygame.K_SPACE:
                bullet_state = "fire"
                firebullet(playerX,playerY)
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT or event.key == pygame.K_DOWN or event.key == pygame.K_UP:
                playerxchange = 0
                playerychange = 0

    playerY += playerychange
    playerX += playerxchange  # the value of playerx changes by +- 0.1 depending on keystroke

    if playerX <= -64:  # this teleports the spaceship from left end to right end
        playerX = 564
    elif playerX >= 564:  # this teleports spaceship from right end to left
        playerX = -64

    if playerY >= 436:  # this prevents spaceship from leaving vertically
        playerY = 436
    if playerY <= 0:
        playerY = 0

    # enemy movement
    enemyX += enemyxchange

    if enemyY >= 476:
        enemyY = 476
        enemyYchange = 0
        enemyXchange = 0

    if enemyX <= 0:
        enemyxchange = 0.2
        enemyY += enemyychange
    elif enemyX >= 465:
        enemyxchange = -0.2
        enemyY += enemyychange

    # bullet movement
    if bullet_state == "fire":
        firebullet(playerX,playerY)


    for bullet in bullets:
        screen.blit(bulletimg,(bullet[0],bullet[1]))  # Print a bullet
        bullet[0] -= bulletxchange  # Updates its position
        bullet[1] -= bulletychange
        if bullet[1] < 0:
            bullets.remove(bullet)

    # collision
    for bullet in bullets:       # Use a for-loop to iterate through all the bullets in the list.
        collision = iscollision(enemyX,bullet[0],bullet[1])
        if collision:               # Test if a single bullet collides with the enemy inside the loop.
            score += 1
            print(score)
            bullets.remove(bullet)  # Remove the bullet from the list when it collides with the enemy.
            enemyX = random.randint(0,476)     # if collision takes place,alien respawns
            enemyY = random.randint(0,30)





    Textscore(score)
    player(playerX,playerY)  # player method is called AFTER screen.fill otherwise the screen will fill after image has been blitted
    enemy(enemyX,enemyY)

    pygame.display.update()  # necessary for events to keep updating

添加 textcode() 函数使我的整个游戏运行非常缓慢。

有什么问题？ 我几乎可以肯定没有内存瓶颈，因为运行这个程序时内存使用率约为 50%。

解决方法

构建字体对象（pygame.font.SysFont）非常耗时。在全局命名空间中初始化时创建一次字体对象，并在函数中使用现有的字体对象：

font30 = pygame.font.SysFont(None,30)

def TextScore(game):
    text2 = font30.render("Your Score is: " + str(game),True,(37,97,188))
    screen.blit(text2,(10,45))