python - 如何调整pygame中的图像大小以到达屏幕的顶部/底部？

Question

我正在用 pygame 重新制作 flappy bird，但主题是星球大战。我已经完成了游戏的美术和一般格式设置，但现在我需要调整细节。我一直在改变数字，试图让光剑完全到达屏幕的顶部和底部，因为目前有时会有一些间隙不是预期的空间可以通过。

import pygame
from random import randint
from pygame.locals import *

#Define Colors - RGB
black = (0,0,0)
white = (255,255,255)
green = (0,255,0)
red = (255,0,0)

pygame.init()

#Screen Size
size = 700,500
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Flappy Bird in Python")

done = False
clock = pygame.time.Clock()

def ball(x,y):
    #Radius of 20 px
    ballImg1 = pygame.image.load('PlayerFrame1.png')
    ballImg1 = pygame.transform.scale(ballImg1,(50,50))
    screen.blit(ballImg1, (x,y))
    ballImg2 = pygame.image.load('PlayerFrame2.png')
    ballImg2 = pygame.transform.scale(ballImg2,(50,50))
    screen.blit(ballImg2, (x,y))

def gameover():
    font = pygame.font.SysFont(None,55)
    text = font.render("Game Over! Try Again?",True,red)
    screen.blit(text, [150,250])

def obstacle(xloc,yloc,xsize,ysize):
    pipe = pygame.image.load('blade.png')
    pipe1 = pygame.transform.scale(pipe,(xsize,ysize))
    pipe2 = pygame.transform.scale(pipe,(xsize,500))
    screen.blit(pipe1,[xloc,yloc,xsize,ysize])
    screen.blit(pipe2,[xloc,int(yloc+ysize+space),xsize,ysize+500]))

#If the ball is between 2 points on the screen, increment score
def Score(score):
    font = pygame.font.SysFont(None,55)
    text = font.render("Score: "+str(score),True,white)
    screen.blit(text, [0,0])

x = 350
y = 250
x_speed = 0
y_speed = 0
ground = 477
xloc = 700
yloc = 0
xsize = 70
ysize = randint(0,350)
#Size of space between 2 blocks
space = 150
obspeed = 2
score = 0


while not done:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                y_speed = -5

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_UP:
                y_speed = 4


    screen.fill(black)
    obstacle(xloc,yloc,xsize,ysize)
    ball(x,y)
    Score(score)

    y += y_speed
    xloc -= obspeed

    if y > ground:
        gameover()
        y_speed = 0
        obspeed = 0

    if x+20 > xloc and y-20 < ysize and x-15 < xsize+xloc:
        gameover()
        y_speed = 0
        obspeed = 0

    if x+20 > xloc and y+20 < ysize and x-15 < xsize+xloc:
        gameover()
        y_speed = 0
        obspeed = 0

    if xloc < -80:
        xloc = 700
        ysize = randint(0,350)

    if x > xloc and x < xloc+3:
        score = score + 1

    pygame.display.flip()
    clock.tick(60)

pygame.quit()

Answer 1

您应该只加载一次图像并重新缩放到窗口高度 - 并获取其大小和位置作为 pygame.Rect()(使用 get_rect())

image = pygame.image.load("images.png").convert()
image = pygame.transform.scale(image, (50, SCREEN_HEIGHT))
image_rect = image.get_rect()

然后你可以为每个管道创建pygame.Rect()

pipe1_rect = image_rect.copy()
pipe2_rect = image_rect.copy()

如果间隙大小为 200，顶部应该为 300 像素

gap_size = 200
gap_top = 300

然后管道的位置将是

pipe1_rect.bottom = gap_top
pipe2_rect.top = pipe1_rect.bottom + gap_size

你会把它写成

screen.blit(image, pipe1_rect)
screen.blit(image, pipe2_rect)

然后你会把它从右移到左

pipe1_rect.x -= 1
pipe2_rect.x -= 1

---

示例代码

编辑: 我补充说:间隙处于随机位置，管道在移动，当球接触管道时，它会在控制台/终端中打印“游戏结束”，当管道接触屏幕左侧时，它会打印在控制台/终端打印“WIN”

import pygame
import random 

# --- constants --- (UPPER_CASE_NAMES)

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600

FPS = 60

BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)

# --- classes --- (CamelCaseNames)

# empty 

# --- main ---

pygame.init()

screen = pygame.display.set_mode( (SCREEN_WIDTH, SCREEN_HEIGHT) )
screen_rect = screen.get_rect()

image = pygame.image.load("Obrazy/images/paddle.png").convert()
image = pygame.transform.scale(image, (50, SCREEN_HEIGHT))
image_rect = image.get_rect()

pipe1_rect = image_rect.copy()
pipe2_rect = image_rect.copy()

pipe1_rect.right = screen_rect.right # move to right of screen
pipe2_rect.right = screen_rect.right # move to right of screen

gap_size = 200
gap_top = 300

#pipe1_rect.bottom = gap_top
pipe1_rect.bottom = random.randint(50, SCREEN_HEIGHT-gap_size-50)
pipe2_rect.top = pipe1_rect.bottom + gap_size

ball_rect = pygame.Rect((0,0,100,100))
ball_rect.center = screen_rect.center

ball_speed = 5

# --- mainloop ---

clock = pygame.time.Clock()

running = True
while running:

    # --- events ---
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_ESCAPE:
                running = False

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                ball_speed = -3

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_UP:
                ball_speed = 4

    # --- changes/moves/updates ---

    ball_rect.y += ball_speed

    pipe1_rect.x -= 1
    pipe2_rect.x -= 1

    if pipe1_rect.colliderect(ball_rect) or pipe2_rect.colliderect(ball_rect):
        print('Game Over')
        pipe1_rect.right = screen_rect.right
        pipe2_rect.right = screen_rect.right
        pipe1_rect.bottom = random.randint(50, SCREEN_HEIGHT-gap_size-50)
        pipe2_rect.top = pipe1_rect.bottom + gap_size

    if pipe1_rect.left == 0:
        print("WIN")
        pipe1_rect.right = screen_rect.right
        pipe2_rect.right = screen_rect.right
        pipe1_rect.bottom = random.randint(50, SCREEN_HEIGHT-gap_size-50)
        pipe2_rect.top = pipe1_rect.bottom + gap_size

    # --- draws ---

    screen.fill(BLACK)

    screen.blit(image, pipe1_rect)
    screen.blit(image, pipe2_rect)

    pygame.draw.rect(screen, GREEN, ball_rect)

    pygame.display.flip()

    # --- FPS ---

    ms = clock.tick(FPS)
    #pygame.display.set_caption('{}ms'.format(ms)) # 40ms for 25FPS, 16ms for 60FPS
    fps = clock.get_fps()
    pygame.display.set_caption('FPS: {}'.format(fps))

# --- end ---

pygame.quit()