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canvas.create_text(x,y,text=".")

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#show.py

#editor: cime

import math

from Tkinter import *
from Canvas import *

def Punkt(master,x,y):
    Rectangle(master,(2*x,2*y),(2*x+1,2*y+1))

def show_graph2(master,source,start,end,neg_x=True,neg_y=True):
    can=Canvas(master,bg='white')
    can.pack()
    if neg_y:
        middle_y=int(can.config()['height'][-1])/4
    else:
        middle_y=0
    if neg_x:
        middle_x=int(can.config()['width'][-1])/4
    else:
        middle_x=0
    #Koordinatensystem zeichnen
    Rectangle(can,(0,2*middle_y),(4*middle_x,2*middle_y+1))
    Rectangle(can,(2*middle_x,0),(2*middle_x+1,4*middle_y))
    #Punkte mit Verbindungen setzen
    y_before=0
    for x in xrange(start,end):
        y=source.read()
        if y is None:
            return
        Punkt(can,middle_x+x,middle_y-y)
        diff=y_before-y
        if abs(diff)>1:
            for i in xrange(y_before,y,-abs(diff)/diff):
                Punkt(can,middle_x+x-1,middle_y-i)
        master.update()###########markierte Zeile ############
        yield True

class reader:
    def __init__(self):
        print 'gestartet'
        self.value=None
    def put(self,value):
        self.value=value
    def read(self):
        return self.value

def begin(root):
    x.destroy()
    s=reader()
    get_back=True
    while get_back:
        s.put(input('naechster Wert: '))
        get_back=show_graph2(root,s,-100,100)
    

if __name__=='__main__':
    root=Tk()
    x=Button(root,text='Anfangen',command=lambda x=root: begin(x))
    x.pack()
    root.mainloop()