def on_touch_down(self, touch):
        if self.collide_point(touch.x, touch.y):
            self.parent.index = self._index
            temp_color = App.get_running_app().theme_cls.primary_color
            temp_color[3] = .4
            ellipse_group = InstructionGroup()
            ellipse_group.add(Color(*App.get_running_app().theme_cls.primary_color))
            ellipse = Ellipse(size=(self.height, self.height), pos=(self.ids.day.center_x - self.height / 2,
                                                                    self.ids.day.center_y - self.height / 2))
            circle = Line(circle=(self.ids.day.center_x, self.ids.day.center_y, self.radius), width=dp(2.5))
            self.bind(radius=lambda *x: on_radius())
            ellipse_group.add(circle)
            ellipse_group.add(Color(*temp_color))
            ellipse_group.add(ellipse)
            self.canvas.add(ellipse_group)
            anim = Animation(width=dp(5.5),
                             duration=self.duration)
            anim.bind(on_complete=lambda *largs: animate())
            anim.start(circle)
            anim2 = Animation(radius=dp(20))
            anim2.start(self)
            self.callback(self)

            def on_radius():
                circle.circle = (self.ids.day.center_x, self.ids.day.center_y, self.radius)

        def animate():
            ellipse_group.remove(ellipse)
            anim2 = Animation(width=.1, duration=self.duration)
            anim2.bind(on_complete=lambda *largs: animate_1())
            anim2.start(circle)

        def animate_1():
            self.canvas.remove(ellipse_group)