Glowing line

main.py

import sys
from kivy.app import App
from kivy.uix.relativelayout import RelativeLayout
from kivy.uix.widget import Widget
from kivy.uix.effectwidget import EffectWidget, InvertEffect, HorizontalBlurEffect, VerticalBlurEffect
from kivy.graphics import Color, Rectangle, Line

class Drawer(EffectWidget):

    def __init__(self, *args, **kwargs):
        super(Drawer, self).__init__(*args, **kwargs)
        self.effects = [HorizontalBlurEffect(size=16.0), VerticalBlurEffect(size=16.0)]
        self.w = Widget(size_hint=(1, 1))
        self.add_widget(self.w)
        self.bind(size=self.draw, pos=self.draw)
        self.draw()

    def draw(self, *args):
        self.w.canvas.clear()
        with self.w.canvas:
            Color(0, 0, 0, 1)
            Rectangle(pos=self.pos, size=self.size)
            self.effects = [HorizontalBlurEffect(size=16.0), VerticalBlurEffect(size=16.0)]
            Color(0, .8, 1.0, 1)
            Line(width=4, points=(0, self.height, self.width, 0))
            #self.effects = [HorizontalBlurEffect(size=2.0), VerticalBlurEffect(size=2.0)]
            #Color(1, 1, 1, 1)
            #Line(width=1, points=(0, self.height, self.width, 0))

class Drawer2(EffectWidget):

    def __init__(self, *args, **kwargs):
        super(Drawer2, self).__init__(*args, **kwargs)
        self.effects = [HorizontalBlurEffect(size=2.0), VerticalBlurEffect(size=2.0)]
        self.w = Widget(size_hint=(1, 1))
        self.add_widget(self.w)
        self.bind(size=self.draw, pos=self.draw)
        self.draw()

    def draw(self, *args):
        self.w.canvas.clear()
        with self.w.canvas:
            Color(0, 1, 1, 1)
            Line(width=2, points=(0, self.height, self.width, 0))

class MyApp(App):

    def build(self, *args, **kwargs):
        super(MyApp, self).__init__(*args, **kwargs)
        base = RelativeLayout(size_hint=(1, 1))
        base.add_widget(Drawer(size_hint=(1, 1)))
        base.add_widget(Drawer2(size_hint=(1, 1)))
        return base

def main(args):
    app = MyApp()
    app.run()

if __name__ == "__main__":
    main(sys.argv[1:])