Question

在我在下面发布的程序中，用户可以点击使用特定颜色绘制的圆圈。根据圆圈是黄色还是蓝色，文本将显示在与＆＃34;正确＆＃34;相同的窗口中。或＆＃34;不正确＆＃34;。我遇到的问题是在用户点击文本将显示的圆圈后，但在第一次尝试后，窗口中的文本将保留，导致每次后续点击的不幸问题导致新文本写入以前显示的文字。如果有人知道如何将文本转换为＆＃34;重置＆＃34;或＆＃34;清除＆＃34;那是在窗口中，所以每次用户点击时窗口都会是空白的，我会很感激。感谢

from graphics import *
import tkinter as tk 
import threading 
import random 


class App(): 

    def __init__(self): 
        self.win = GraphWin('Demo2', 800, 600) # give title and dimensions 
        self.th = threading.Thread(target=self.FlashThread, daemon=False) 


    def FlashThread(self): 
        while not self.win.isClosed(): 
            count = random.randint(0, 8) 
            t = threading.Timer(1.0, self.flash, [count]) 
            t.start() 
            t.join() 


    def flash(self, count): 
        try: 
            diameter = 50
            centers = ((55,55),  (170,55), (285,55),  (55,170), (170,170),  
                   (285,170), (55,285), (170,285), (285,285)) 
            circles = list() 
            for point in centers: 
                c = Circle(Point(point[0], point[1]), diameter) 
                circles.append(c) 
                c.setFill("blue") 
                c.draw(self.win) 
            circles[count].setFill("yellow") 
            mouseClick = self.win.getMouse() 
            correctMessage = Text(Point(self.win.getWidth()/2, 20), 'Correct!') 
            incorrectMessage = Text(Point(self.win.getWidth()/2, 20), 'Incorrect,Try Again') 
            leftX  = centers[count][0] - diameter 
            rightX = centers[count][0] + diameter 
            upperY = centers[count][1] - diameter 
            lowerY = centers[count][1] + diameter 
            if (upperY < mouseClick.y < lowerY) and (leftX < mouseClick.x < rightX): 
                correctMessage.draw(self.win) 
            else: 
                incorrectMessage.draw(self.win) 
        except: 
            self.win.exit(0) 


if __name__ == "__main__": 
    try: 
        app = App() 
        app.th.start() 
        app.win.mainloop() 
        app.th.join() 
    finally: 
        app.th.close() 
        app.close()

Answer 1

您可以使用undraw()方法执行此操作。将您的__init__更改为：

def __init__(self):
    self.win = GraphWin('Demo2', 800, 600) # give title and dimensions
    self.th = threading.Thread(target=self.FlashThread)

    self.correctMessage = Text(Point(self.win.getWidth()/2, 20), 'Correct!')
    self.incorrectMessage = Text(Point(self.win.getWidth()/2, 20), 'Incorrect,Try Again')

和flash到

def flash(self, count):
        try:
            self.correctMessage.undraw()
            self.incorrectMessage.undraw()

            diameter = 50
            centers = ((55,55),  (170,55), (285,55),  (55,170), (170,170),
                   (285,170), (55,285), (170,285), (285,285))
            circles = list()
            for point in centers:
                c = Circle(Point(point[0], point[1]), diameter)
                circles.append(c)
                c.setFill("blue")
                c.draw(self.win)
            circles[count].setFill("yellow")
            mouseClick = self.win.getMouse()

            leftX  = centers[count][0] - diameter
            rightX = centers[count][0] + diameter
            upperY = centers[count][1] - diameter
            lowerY = centers[count][1] + diameter
            if (upperY < mouseClick.y < lowerY) and (leftX < mouseClick.x < rightX):
                self.correctMessage.draw(self.win)
            else:
                self.incorrectMessage.draw(self.win)


        except:
            self.win.exit(0)

需要帮助尝试使用图形正确显示信息

1 个答案: