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我試圖學習Tkinter的目標是能夠創建一個'實時'範圍來繪製數據。作爲測試,我試圖在每次按下「繪製」按鈕時在畫布上繪製多邊形。三角形的位置是隨機的。我有兩個問題:動態添加項目到Tkinter帆布
程序啓動時畫布上有一個三角形,爲什麼以及如何解決此問題?
當我按下按鈕時,它不繪製任何三角形,至少沒有我能看到的。
CODE
from Tkinter import *
from random import randint
class App:
def __init__(self,master):
#frame = Frame(master)
#frame.pack(side = LEFT)
self.plotspc = Canvas(master,height = 100, width = 200, bg = "white")
self.plotspc.grid(row=0,column = 2, rowspan = 5)
self.button = Button(master, text = "Quit", fg = "red", \
command = master.quit)
self.button.grid(row=0,column=0)
self.drawbutton = Button(master, text = "Draw", command = \
self.pt([50,50]))
self.drawbutton.grid(row = 0, column = 1)
def pt(self, coords):
coords[0] = coords[0] + randint(-20,20)
coords[1] = coords[1] + randint(-20,20)
x = (0,5,10)
y = (0,10,0)
xp = [coords[0] + xv for xv in x]
yp = [coords[1] + yv for yv in y]
ptf = zip(xp,yp)
self.plotspc.create_polygon(*ptf)
if __name__ == "__main__":
root = Tk()
app = App(root)
root.mainloop()