如何检测一次按键并使用"！="符号？

Question

我正试图找出如何在按住"向上"箭头键时增加形状移动的强度。当我拿着空格键时，我希望我的形状能根据强度隆隆作响，我已经做到了。我还想做的是，可以通过按一次"向上"箭头键来增加强度(注意：一次。目前，当我按一次箭头键时，它循环得太快，会将强度乘以5000倍。我希望每次只加一个数字。(这是一个我不想用的代码。

import pygame
import random
import time

BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)
# Edit the intensity of the shake (Must be one number apart)
# Ex: a = -100, b = 101. A is negative, B is positive
a = -4
b = 5
up = 10
intensity = (a, b)
pygame.init()
size = (700, 500)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("My Game")
done = False
clock = pygame.time.Clock()

class Rectangle():
def __init__(self):
self.x = random.randrange(0, 700)
self.y = random.randrange(0, 500)
self.height = random.randrange(20, 70)
self.width = random.randrange(20, 70)
self.x_change = random.randrange(-3, 3)
self.y_change = random.randrange(-3, 3)
self.color = random.sample(range(250), 4)
def draw(self):
pygame.draw.rect(screen, self.color, [self.x, self.y, self.width, self.height])
def move(self):
self.x += self.x_change
self.y += self.y_change

class Ellipse(Rectangle):
pass
def draw(self):
pygame.draw.ellipse(screen, self.color, [self.x, self.y, self.width, self.height])
def move(self):
self.x += self.x_change
self.y += self.y_change
my_list = []
for number in range(600):
my_object = Rectangle()
my_list.append(my_object)
for number in range(600):
my_object = Ellipse()
my_list.append(my_object)
# -------- Main Program Loop -----------
while not done:
keys = pygame.key.get_pressed()
# --- Main event loop
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
screen.fill(BLACK)
for rect in my_list:
rect.draw()
rect.move()
for rectElli in my_list:
rectElli.draw()
if keys[pygame.K_SPACE]:
rectElli.y_change = random.randrange(a, b)
rectElli.x_change = random.randrange(a, b)
rectElli.move()
print(a)
print(b)
if keys[pygame.K_UP] and up / 10 == 1:
up += 1
a -= 1
b -= -1
print(a)
print(b)
print(up)
if up / 10 != 1:
up += 1
pygame.display.flip()
clock.tick(60)
pygame.quit()

这是在我想增加强度之前工作的代码。

import pygame
import random
import time

BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)
# Edit the intensity of the shake (Must be one number apart)
# Ex: a = -100, b = 101. A is negative, B is positive
a = -4
b = 5
up = 10
intensity = (a, b)
pygame.init()
size = (700, 500)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("My Game")
done = False
clock = pygame.time.Clock()

class Rectangle():
def __init__(self):
self.x = random.randrange(0, 700)
self.y = random.randrange(0, 500)
self.height = random.randrange(20, 70)
self.width = random.randrange(20, 70)
self.x_change = random.randrange(-3, 3)
self.y_change = random.randrange(-3, 3)
self.color = random.sample(range(250), 4)
def draw(self):
pygame.draw.rect(screen, self.color, [self.x, self.y, self.width, self.height])
def move(self):
self.x += self.x_change
self.y += self.y_change

class Ellipse(Rectangle):
pass
def draw(self):
pygame.draw.ellipse(screen, self.color, [self.x, self.y, self.width, self.height])
def move(self):
self.x += self.x_change
self.y += self.y_change
my_list = []
for number in range(600):
my_object = Rectangle()
my_list.append(my_object)
for number in range(600):
my_object = Ellipse()
my_list.append(my_object)
# -------- Main Program Loop -----------
while not done:
keys = pygame.key.get_pressed()
# --- Main event loop
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
screen.fill(BLACK)
for rect in my_list:
rect.draw()
rect.move()
for rectElli in my_list:
rectElli.draw()
if keys[pygame.K_SPACE]:
rectElli.y_change = random.randrange(a, b)
rectElli.x_change = random.randrange(a, b)
rectElli.move()
pygame.display.flip()
clock.tick(60)
pygame.quit()

Answer 1

第一个问题是，在遍历椭圆的for-循环中增加强度。所以强度不是增加一次，而是每个椭圆增加一次。

如果你不想在每10帧中增加强度，那么你必须验证是否在每帧中增加帧计数器up，但你必须验证它是否可以被10整除。验证积分除以10的余数是否为0。使用模运算符(%(计算余数：

if up % 10 == 0:

参见示例，当按下UP时，强度增加，当释放时，强度恢复正常：

while not done:
keys = pygame.key.get_pressed()
# --- Main event loop
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
screen.fill(BLACK)
for rect in my_list:
rect.draw()
rect.move()
for rectElli in my_list:
rectElli.draw()
if keys[pygame.K_SPACE]:
rectElli.y_change = random.randrange(a, b)
rectElli.x_change = random.randrange(a, b)
rectElli.move()
if keys[pygame.K_UP]:
up += 1
if up % 10 == 0:
a -= 1
b -= -1
else:
a, b = -4, 5
pygame.display.flip()
clock.tick(60)