gistfile1.txt

import kivy
kivy.require('1.5.1')

from kivy.app import App
from kivy.clock import Clock
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.widget import Widget
from kivy.properties import ObjectProperty, ReferenceListProperty, NumericProperty, ListProperty
from kivy.vector import Vector
from kivy.graphics import Color, Ellipse, Line

import math

class MainView(Widget):

    newdot = ObjectProperty()

    old_position = [0,0]
    counter = 0.0

    def update(self,dt):
        self.counter += 1
        new_point = [self.counter, self.old_position[1] + 50*math.sin(self.counter)]
        self.add_point(new_point)

    def add_point(self, new_position):
        self.newdot.center_y = new_position[1]
        self.newdot.center_x = new_position[0]
        graphing = GraphDot()
        graphing.add_line(new_position)

        if self.counter > self.width:
            self.counter = 0.0
            self.old_position = [0,0]
            self.canvas.clear()


class GraphDot(Widget):

    graph = ObjectProperty()

    def add_line(self, coords):
        self.theline(points = (coords[0], coords[1]))


class SimpleGraphApp(App):

    starting_point = [0,0]

    def build(self):
        parent = MainView()
        Clock.schedule_interval(parent.update,1/5)

        return parent

if __name__=='__main__':
    SimpleGraphApp().run()

gistfile2.txt

#:kivy 1.5.1

<MainView>:
    newdot: graphdot
    
    GraphDot:
        id: graphdot


<GraphDot>:
    size: 20,20
    canvas:
        Ellipse:
            size: self.size
            pos: self.center
        Line:
            id: theline