使用 Tkinter 的多线程 python [英] Mutli-threading python with Tkinter

问题描述

我正在使用这些功能在画布上绘制小圆圈:

I'm drawing little circles on a canvas with these functions :

这是绘制圆圈的函数:

class Fourmis:

def __init__(self, can, posx, posy, name, radius):
    self.can = can

    self.largeur_can = int(self.can.cget("width"))
    self.hauteur_can = int(self.can.cget("height"))

    self.posx = posx
    self.posy = posy
    self.name = name 
    self.radius = radius

    self.ball1 = self.can.create_oval(self.posy, self.posx, self.posy+radius, self.posx+radius, outline=self.name, fill=self.name, width=2)

    self.nx = randrange(-10,10,1)
    self.nx /= 2.0
    self.ny = randrange(-10,10,1)
    self.ny /= 2.0

    #self.can.bind("<Motion>", self.destruction, add="+") 
    self.statut = True

    self.move()

def move(self):
    if self.statut == True :
        self.pos_ball = self.can.coords(self.ball1)
        self.posx_ball = self.pos_ball[0]
        self.posy_ball = self.pos_ball[1]

        if self.posx_ball < 0 or (self.posx_ball + self.radius) > self.largeur_can:
            self.nx = -self.nx         
        if self.posy_ball < 0 or (self.posy_ball + self.radius) > self.hauteur_can:
            self.ny = -self.ny

        self.can.move(self.ball1, self.nx, self.ny)

        self.can.after(10, self.move)

这个创建画布和圆圈:

class App(Frame):

def __init__(self):
    self.root=Tk()
    self.can=Canvas(self.root,width=800,height=600,bg="black")
    self.can.pack()

    self.create(50, "green")
    self.create(50, "purple")



def mainloop(self):
    self.root.mainloop()


def create(self, i, name):
    for x in range(i):
        self.x=Fourmis(self.can,100,400, name,0)

我调用这些行来运行项目:

I call these lines to run the project :

jeu = App()
jeu.mainloop()

在不同线程中执行 self.create(50, "green") 和 self.create(50, "purple") 的正确方法是什么?

What is the correct way to execute self.create(50, "green") and self.create(50, "purple") in different threads?

我尝试了以下方法，但无法使其正常工作.:

I have tried the following, but could not get it to work.:

class FuncThread(threading.Thread):
def __init__(self, i, name):
    self.i = i
    self.name = name
    threading.Thread.__init__(self)

def run(self):
    App.create(self, self.i, self.name)

有人能告诉我如何运行这些线程吗?

Is someone able to tell me how to run these threads?

推荐答案

当需要此功能时，您要做的是通过将您希望执行的事件放入线程共享的队列中来安排它们.这样，在给定的线程中，您指定要通过排队来运行create(50, ...)"，然后主线程将事件出队并执行.

When this functionality is needed, what you do is schedule the events you wish to perform by putting them in a queue shared by the threads. This way, in a given thread you specify that you want to run "create(50, ...)" by queueing it, and the main thread dequeue the event and perform it.

这是在第二个线程中创建移动球的基本示例:

Here is a basic example for creating moving balls in a second thread:

import threading
import Queue
import random
import math
import time
import Tkinter

random.seed(0)

class App:
    def __init__(self, queue, width=400, height=300):
        self.width, self.height = width, height
        self.canvas = Tkinter.Canvas(width=width, height=height, bg='black')
        self.canvas.pack(fill='none', expand=False)
        self._oid = []
        self.canvas.after(10, self.move)

        self.queue = queue
        self.canvas.after(50, self.check_queue)

    def check_queue(self):
        try:
            x, y, rad, outline = self.queue.get(block=False)
        except Queue.Empty:
            pass
        else:
            self.create_moving_ball(x, y, rad, outline)
        self.canvas.after(50, self.check_queue)

    def move(self):
        width, height = self.width, self.height
        for i, (oid, r, angle, speed, (x, y)) in enumerate(self._oid):
            sx, sy = speed
            dx = sx * math.cos(angle)
            dy = sy * math.sin(angle)
            if y + dy + r> height or y + dy - r < 0:
                sy = -sy
                self._oid[i][3] = (sx, sy)
            if x + dx + r > width or x + dx - r < 0:
                sx = -sx
                self._oid[i][3] = (sx, sy)
            nx, ny = x + dx, y + dy
            self._oid[i][-1] = (nx, ny)
            self.canvas.move(oid, dx, dy)
        self.canvas.update_idletasks()
        self.canvas.after(10, self.move)

    def create_moving_ball(self, x=100, y=100, rad=20, outline='white'):
        oid = self.canvas.create_oval(x - rad, y - rad, x + rad, y + rad,
                outline=outline)
        oid_angle = math.radians(random.randint(1, 360))
        oid_speed = random.randint(2, 5)
        self._oid.append([oid, rad, oid_angle, (oid_speed, oid_speed), (x, y)])

def queue_create(queue, running):
    while running:
        if random.random() < 1e-6:
            print "Create a new moving ball please"
            x, y = random.randint(100, 150), random.randint(100, 150)
            color = random.choice(['green', 'white', 'yellow', 'blue'])
            queue.put((x, y, random.randint(10, 30), color))
        time.sleep(0) # Effectively yield this thread.

root = Tkinter.Tk()
running = [True]

queue = Queue.Queue()

app = App(queue)
app.create_moving_ball()
app.canvas.bind('<Destroy>', lambda x: (running.pop(), x.widget.destroy()))

thread = threading.Thread(target=queue_create, args=(queue, running))
thread.start()

root.mainloop()

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