ScreenWidgetsScatter.kv

#:kivy 1.0

<MyScatter>:
    canvas:
        Color:
            hsv: 0, 1, .5
        Rectangle:
            size: self.size

    canvas.after:
        Color:
            hsv: .1, 1, .5
            a: .2
        Rectangle:
            pos: self.pos
            size: self.bbox[1]

        Color:
            rgb: 0, 1, 0
        Line:
            points: [self.x, self.top, self.right, self.top]
        Line:
            points: [self.x, self.y, self.x, self.top]
        Line:
            points: [self.center_x, self.y, self.center_x, self.top]
        Line:
            points: [self.x, self.center_y, self.right, self.center_y]

        Line:
            points: [self.center[0], self.center[1], self.right, self.top]


    BoxLayout:
        size: root.size
        orientation: 'vertical'
        Label:
            text: 'Position\n' + str(root.pos)
            text_size: (root.width, None)
        Label:
            text: 'Size\n' + str(root.size)
            text_size: (root.width, None)
        Label:
            text: 'Center\n' + str(root.center)
            text_size: (root.width, None)
        Label:
            text: 'Bounding Box\n' + str(root.bbox)
            text_size: (root.width, None)
        Label:
            text: 'Top\n' + str(root.top)
            text_size: (root.width, None)
        Label:
            text: 'Right\n' + str(root.right)
            text_size: (root.width, None)