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我试图学习Tkinter的目标是能够创建一个'实时'范围来绘制数据。作为测试,我试图在每次按下“绘制”按钮时在画布上绘制多边形。三角形的位置是随机的。我有两个问题:动态添加项目到Tkinter帆布
程序启动时画布上有一个三角形,为什么以及如何解决此问题?
当我按下按钮时,它不绘制任何三角形,至少没有我能看到的。
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()