Shows how to use a kivy matrix to acomplish the same that scatter does (ignoring the touch transfomration).

scatter_matrix.py

from kivy.uix.scatter import Scatter
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.app import runTouchApp

kv = """
#:import Matrix kivy.graphics.transformation.Matrix 
BoxLayout:
    Scatter:
        id: scatter
        auto_bring_to_front: False
        on_size: print(self.size)
        on_transform: 
            other.mat = Matrix().translate(-other.x, -other.y, 0)
            other.mat = self.transform.multiply(other.mat)
        Label:
            size: self.parent.size
            pos: 0, 0
            text: "Hello"
    Widget:
        id: other
        mat: Matrix()
        canvas.before:
            PushMatrix
            MatrixInstruction:
                matrix: self.mat
        canvas.after:
            PopMatrix
        Label:
            size: self.parent.size
            pos: self.parent.pos
            text: "Hello2"
"""


if __name__ == '__main__':
    runTouchApp(Builder.load_string(kv))