test_scatter.py

from kivy.app import App
from kivy.lang import Builder
from kivy.factory import Factory


KV = '''
Widget:
    Scatter:
        id: scatter
        size: img.size

        AsyncImage:
            id: img
            source: 'https://placekitten.com/g/200/300'
            size_hint: None, None
            size: self.texture_size
    Widget:
        on_touch_down:
            if args[1].is_double_tap: print("double tap")
        canvas:
            Color:
                rgba: 1, 0, 0, 1
            Line:
                rectangle: list(scatter.pos) + list(scatter.size)
            Color:
                rgba: 1, 1, 0, 1
            Line:
                rectangle: list(scatter.pos) + list(scatter.bbox)
'''


class Application(App):
    def build(self):
        return Builder.load_string(KV)


if __name__ == "__main__":
    Application().run()