如何在 pygame 中添加敌人? [英] How do I add enemies in pygame?
问题描述
我正在用 pygame 制作一个简单的游戏，目标是躲避来袭的敌人.我想要一个领带战士的形象随机下降，xwing 必须躲避他们，否则你会死.我如何在我的脚本中实现随机平局战士?在我的代码中，我收到一个错误，指出 x 未定义.
I am making a simply game with pygame, and the objective is to dodge the incoming enemies. I want a tie fighter image to come down randomly, and the xwing has to dodge them or you will die. How do I implement random tie fighters into my script? In my code I get an error that says x is not defined.
import pygame
import time
import random
pygame.init()
display_width = 1280
display_height= 800
pygame.display.set_mode((display_width, display_height), pygame.FULLSCREEN)
gameDisplay= pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption('X-Wing Game')
clock= pygame.time.Clock()
black= (0,0,0)
white= (255,255,255)
red = (255,0,0)
blue_violet = (138,43,226)
xwing_width = 65
xwing_height = 130
tie_width = 80
tie_height =64
#images
xwingImg = pygame.image.load('X-Wing.bmp')
tieImg= pygame.image.load('tiefighter.png')
def things(thingx, thingy, thingw, thingh, color):
pygame.draw.rect(gameDisplay, color, [thingx, thingy, thingw, thingh])
gameDisplay.blit(tieImg,(x,y))
def tieImg (x,y):
pygame.image.load('tieImg')
def xwing (x,y):
gameDisplay.blit (xwingImg,(x,y))
def text_objects(text, font):
textSurface = font.render(text, True, red)
return textSurface, textSurface.get_rect()
def crash ():
message_display ('Ouch, You Crashed!')
def message_display(text):
largeText = pygame.font.Font('freesansbold.ttf',25)
TextSurf, TextRect = text_objects(text, largeText)
TextRect.center = ((display_width/2), (display_height/2))
gameDisplay.blit(TextSurf, TextRect)
pygame.display.update()
time.sleep(1.3)
game_loop()
def game_loop():
x = (display_width * 0.45)
y = (display_height * .75)
x_change = 0
y_change = 0
thing_startx = random.randrange(0, display_width)
thing_starty = -600
thing_speed = 7
thing_width = 81
thing_height =65
gameEXIT = False
while not gameEXIT:
for event in pygame.event.get() :
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
x_change = -5
if event.key == pygame.K_UP:
y_change= -5
if event.key == pygame.K_DOWN:
y_change =5
elif event.key == pygame.K_RIGHT:
x_change = 5
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
x_change=0
x += x_change
y += y_change
gameDisplay.fill(black)
things(thing_startx, thing_starty, thing_width, thing_height, black )
thing_starty += thing_speed
xwing (x,y)
if x > display_width - xwing_width or x < 0:
x_change=0
if y>display_height-xwing_height or y<0:
y_change=0
pygame.display.update()
clock.tick(60)
game_loop()
pygame.quit()
quit()
推荐答案
您可以使用列表并附加 pygame.Rects 到它，它存储敌人的位置和大小，然后在矩形位置 blit 敌人图像.对于碰撞检测，遍历敌人列表并使用 Rect.colliderect 方法检查玩家 rect 是否与敌人 rect 发生碰撞.
You can use a list and append pygame.Rects to it which store the position and size of the enemies, then just blit the enemy image at the rect positions. For the collision detection, loop over the enemy list and use the Rect.colliderect method to check if the player rect collides with an enemy rect.
import sys
import random
import pygame as pg
pg.init()
screen = pg.display.set_mode((640, 480))
XWING_IMG = pg.Surface((25, 38))
XWING_IMG.fill((90, 120, 150))
TIE_IMG = pg.Surface((40, 24))
TIE_IMG.fill((190, 60, 50))
BG_COLOR = pg.Color('gray15')
def main():
clock = pg.time.Clock()
# Surfaces/images have a `get_rect` method which
# returns a rect with the dimensions of the image.
player_rect = XWING_IMG.get_rect()
player_rect.center = (300, 400)
change_x = 0
change_y = 0
enemies = []
spawn_counter = 30
done = False
while not done:
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
if event.type == pg.KEYDOWN:
if event.key == pg.K_d:
change_x = 5
if event.key == pg.K_a:
change_x = -5
if event.type == pg.KEYUP:
if event.key == pg.K_d and change_x > 0:
change_x = 0
if event.key == pg.K_a and change_x < 0:
change_x = 0
# Spawn enemies if counter <= 0 then reset it.
spawn_counter -= 1
if spawn_counter <= 0:
# Append an enemy rect. You can pass the position directly as an argument.
enemies.append(TIE_IMG.get_rect(topleft=(random.randrange(600), 0)))
spawn_counter = 30
# Update player_rect and enemies.
player_rect.x += change_x
player_rect.y += change_y
for enemy_rect in enemies:
enemy_rect.y += 5
# Collision detection with pygame.Rect.colliderect.
if player_rect.colliderect(enemy_rect):
print('Collision!')
# Draw everything.
screen.fill(BG_COLOR)
for enemy_rect in enemies:
screen.blit(TIE_IMG, enemy_rect)
screen.blit(XWING_IMG, player_rect)
pg.display.flip()
clock.tick(30)
if __name__ == '__main__':
main()
pg.quit()
sys.exit()
使用 spawn_counter 变量以这种方式计算帧数意味着游戏将依赖于帧速率(对象生成速度较慢或较快取决于帧速率).要实现与帧速率无关的生成计时器，您可以使用 clock.tick 或 pygame.time.get_ticks 返回的时间，如此处.
Counting the frames in this way with the spawn_counter variable means that the game will be frame rate dependent (the objects spawn slower or faster depending on the frame rate). To implement a frame rate independent spawn timer you can use the time returned by clock.tick or pygame.time.get_ticks as explained here.
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