我最近开始使用pygame编码，为一个需要实时雷达的项目创建一个GUI雷达。我遇到的问题是我想在运行其余代码的同时运行 Ultra(( 函数，从而允许我实时更新"距离"变量。我希望这个距离变量更新屏幕上的标签。任何帮助将不胜感激。谢谢！
import pygame
import time
import sys
import RPi.GPIO as GPIO
import os
BLACK = (0,0,0)
WHITE = (255,255,255)
RED = (255,0,0)
GREEN = (0,155,0)
BLUE = (0,0,255)
pygame.init()
clock = pygame.time.Clock()
menuW = 400
menuH = 250
mainDisplay = pygame.display.set_mode((menuW, menuH))
pygame.display.set_caption("Radar ALPHA 1.0")
#FONTS
fontSmall = pygame.font.SysFont(None, 25)
fontBig = pygame.font.SysFont(None , 50)
#HOMEMADE FUNCTIONS
def ultra():
global Distance
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
TRIG = 7
ECHO = 11
GPIO.setup(TRIG,GPIO.OUT)
GPIO.output(TRIG,0)
GPIO.setup(ECHO,GPIO.IN)
time.sleep(1)
print "Starting mesurement..."
GPIO.output(TRIG,1)
time.sleep(0.00001)
GPIO.output(TRIG,0)
while GPIO.input(ECHO) == 0:
pass
start = time.time()
while GPIO.input(ECHO) == 1:
pass
stop = time.time()
Distance = (stop-start) * 17000
print Distance , " CM"
def message_small(msg,colour,width,height):
screen_text = fontSmall.render(msg, True, colour)
mainDisplay.blit(screen_text, [width, height])
def message_big(msg,colour,width,height):
screen_text = fontBig.render(msg, True, colour)
mainDisplay.blit(screen_text, [width, height])
def circle(display,r):
pygame.draw.circle(display, WHITE, [500, 360], r, 3)
def button(bPosX,bPosY,bX,bY):
pygame.draw.rect(mainDisplay, GREEN, [bPosX, bPosY, bX, bY] )
menuOn = True
guiOn = True
radarOn = True
dataOn = True
infoOn = True
#VARs
radarSetup = True
ultraSetup = True
targetSpeed = 5
targetX = 200
targetY = 100
changeTX = 0
changeTY = 0
#MAIN BIT
while guiOn:
while menuOn:
#VARs and SETUP
mainDisplay.fill(WHITE)
message_big("Radar Menu ALPHA 1.0", RED, 5,5)
message_small("Press R to go to Radar", BLACK, 5,50)
message_small("Press D to go to Data", BLACK , 5, 70)
message_small("Press I to go to Info" , BLACK, 5, 90)
message_small("Press Q to Quit" , BLACK, 250,220)
pygame.display.update()
#EVENT HANDLER
for event in pygame.event.get():
if event.type == pygame.QUIT:
menuOn = False
radarOn = False
dataOn = False
infoOn = False
guiOn = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_r:
menuOn = False
dataOn = False
infoOn = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_d:
menuOn = False
radarOn = False
infoOn = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_i:
menuOn = False
radarOn = False
dataOn = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_q:
radarOn = False
dataOn = False
infoOn = False
guiOn = False
menuOn = False
#LOGICS
while radarOn:
while radarSetup:
pygame.init()
clock = pygame.time.Clock()
menuW = 1000
menuH = 720
radarDisplay = pygame.display.set_mode((menuW, menuH))
pygame.display.set_caption("Radar ALPHA 1.0")
radarSetup = False
#CLEAR and setup
radarDisplay.fill(WHITE)
message_big("RADAR v1.0",RED, 400 , 20)
#EVENT HANDLER
for event in pygame.event.get():
if event.type == pygame.QUIT:
menuOn = False
radarOn = False
dataOn = False
infoOn = False
guiOn = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
changeTX = - targetSpeed
if event.key == pygame.K_RIGHT:
changeTX = targetSpeed
if event.key == pygame.K_UP:
changeTY = - targetSpeed
if event.key == pygame.K_DOWN:
changeTY = targetSpeed
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
changeTX = 0
if event.key == pygame.K_RIGHT:
changeTX = 0
if event.key == pygame.K_UP:
changeTY = 0
if event.key == pygame.K_DOWN:
changeTY = 0
#Circle Set UP
pygame.draw.circle(radarDisplay, BLACK, [menuW/2, menuH/2], 300)
pygame.draw.circle(radarDisplay, GREEN, [menuW/2, menuH/2], 20)
circle(radarDisplay,50)
circle(radarDisplay,100)
circle(radarDisplay,150)
circle(radarDisplay,200)
circle(radarDisplay,250)
#LOGICS
targetX += changeTX
targetY += changeTY
pygame.draw.circle(radarDisplay, RED, [targetX, targetY], 5)
pygame.display.update()
clock.tick(2)
while dataOn:
#CLEAR
mainDisplay.fill(WHITE)
message_small("DATA",RED, 150 , 100)
pygame.display.update()
#VARs
#EVENT HANDLER
for event in pygame.event.get():
if event.type == pygame.QUIT:
menuOn = False
radarOn = False
dataOn = False
infoOn = False
guiOn = False
#LOGICS
while infoOn:
#CLEAR
mainDisplay.fill(WHITE)
message_small("INFO",RED, 150 , 100)
pygame.display.update()
#VARs
#EVENT HANDLER
for event in pygame.event.get():
if event.type == pygame.QUIT:
menuOn = False
radarOn = False
dataOn = False
infoOn = False
guiOn = False
#LOGICS
clock.tick(10)
pygame.quit()
quit()
线程
与代码分开运行。如果要在线程之间共享数据，请确保它们是包含数据的线程安全对象，否则在写入错误或数据更改后出现其他错误后会被读取。https://docs.python.org/3.4/library/threading.html
另一种方法是使用用于某些主要处理的多处理库。
import threading
import queue
import time
def mymethod(storage, stop):
"""Continuously add counters to the given storage queue.
Args:
storage (queue.Queue): Hold the data.
stop (threading.Event): Thread safe signal for when to quit.
"""
counter = 0
while not stop.is_set():
storage.put(counter)
counter += 1
time.sleep(0.1)
# end mymethod
if __name__ == "__main__":
storage = queue.Queue()
stop = threading.Event()
th = threading.Thread(target=mymethod, args=(storage, stop))
# th.daemon = True # Daemon threads are cleaned up automatically
th.start() # Run
for i in range(10):
# We don't actually know how fast each program runs. Order will not be saved.
print(storage.get(0)) # Pull the thread counter number. 0 means no wait
storage.put(i) # Set my counter number
time.sleep(0.2) # Just to show things aren't happening in any order.
time.sleep(1) # Do other stuff and forget about it.
stop.set() # Clear the stop signal, so the thread can leave the loop and quit
th.join(0) # Safely close the thread when it is done
print("thread closed")
while not storage.empty():
print(storage.get(0))