[英]Implement multithreading in Python Zelle graphics
我正在創建一個使用Zelle的graphics.py在窗口中打開世界地圖的程序。 它具有一個在地圖上繪制點的功能,另一個功能是在屏幕上顯示這些點1秒鍾后將其取消繪制(繪制后存儲在列表中)。 我希望這些函數可以同時工作,但是當在線程中調用addDots()
函數時,它不會在窗口中繪制點,而只是停頓。 這是我運行的模塊:
import thread
import threading
import time
import random
import sys
sys.path.append('..')
from Display import map
import tester
import datetime
dots = list(())
def deleteDots():
while 1==1:
tF = datetime.datetime.now()
a = 0
for i in range(len(dots)):
tD = tF - dots[i-a][2]
tD = int(str(tD)[5:7])
if tD >= 1:
map.deletePoint(dots[i-a][0],dots[i-a][1])
dots.pop(i-a)
a = a+1
def addDots():
oldResponseCount = tester.getResponseCount()
oldResponseCount = int(str(oldResponseCount))
while 1==1:
print(oldResponseCount)
newResponseCount = tester.getResponseCount()
newResponseCount = int(str(newResponseCount))
print(newResponseCount)
if(newResponseCount != oldResponseCount):
difference = newResponseCount - oldResponseCount
for i in range(difference):
lat = random.randint(-90,90)
long = random.randint(-180,180)
map.drawPoint(lat,long)
tI = datetime.datetime.now()
dots.append([lat,long,tI])
oldResponseCount = newResponseCount
if __name__ == '__main__':
threading.Thread(target=addDots).start()
threading.Thread(target=deleteDots).start()
這里是地圖模塊,它在圖形窗口上繪制地圖,並包含繪制和刪除點的功能:
from graphics import *
import math
import images
size = 0.6
Circles = list(())
win = GraphWin("My Window", 1920*size, 1080*size)
win.setBackground('blue')
images.test(size)
myImage = Image(Point(960*size,540*size), "../Display/temp.gif")
myImage.draw(win)
import time
def drawPoint(lat,long):
x = int(long*5.3+960)*size
y = int(lat*(-5.92)+540)*size
pt = Point(x,y)
cir = Circle(pt,5)
cir.setFill(color_rgb(255,0,0))
Circles.append([cir,x,y])
cir.draw(win)
def deletePoint(lat,long):
x = int(long*5.3+960)*size
y = int(lat*(-5.92)+540)*size
for c in Circles:
if c[1]==x and c[2]==y:
c[0].undraw()
我應該怎么做呢?
有幾個問題必須解決。 首先,任何調用tkinter的graphics.py命令(即導致繪制/未繪制內容的命令)必須由主(主)線程發出。 因此,我們需要輔助線程將繪圖請求傳達給主線程。
其次,您有兩個輔助線程都在修改“ Circles
和“ dots
列表-您需要同步(鎖定)訪問這些列表,以便一次只能有一個線程可以修改或迭代它們。
下面以我對您的代碼的修改為例。 我消除了map和tester例程,因為我只是將一個點放在一個線程的窗口上,並在另一個線程中將它們刪除一秒后將其刪除:
from threading import Thread, Lock
from queue import Queue # use for thread-safe communications
from random import randint
import time
from graphics import *
def drawPoint(lat, long):
x = int(long * 5.3 + 960)
y = int(lat * -5.92 + 540)
point = Point(x, y)
circle = Circle(point, 5)
circle.setFill(color_rgb(255, 0, 0))
circles_lock.acquire()
circles.append(circle)
circles_lock.release()
actions.put((circle.draw, win))
def deletePoint(lat, long):
global circles
x = int(long * 5.3 + 960)
y = int(lat * -5.92 + 540)
keep_circles = []
circles_lock.acquire()
for circle in circles:
center = circle.getCenter()
if center.getX() == x and center.getY() == y:
actions.put((circle.undraw,))
else:
keep_circles.append(circle)
circles = keep_circles
circles_lock.release()
def deleteDots():
global dots
while True:
keep_dots = []
dots_lock.acquire()
now = time.time()
for dot in dots:
lat, long, then = dot
if now - then >= 1.0:
deletePoint(lat, long)
else:
keep_dots.append(dot)
dots = keep_dots
dots_lock.release()
time.sleep(0.5)
def addDots():
while True:
lat = randint(-90, 90)
long = randint(-180, 180)
drawPoint(lat, long)
dots_lock.acquire()
dots.append((lat, long, time.time()))
dots_lock.release()
time.sleep(0.25)
win = GraphWin("My Window", 1920, 1080)
circles = []
circles_lock = Lock()
dots = []
dots_lock = Lock()
actions = Queue()
Thread(target=addDots, daemon=True).start()
Thread(target=deleteDots, daemon=True).start()
while True:
if not actions.empty():
action, *arguments = actions.get()
action(*arguments)
time.sleep(0.125)
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