from kivy.config import Config
Config.set('graphics','fullscreen','auto')

from kivy.uix.label import Label
from kivy.uix.image import Image
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.scatterlayout import ScatterLayout

from kivy.lang import Builder
from kivy.base import runTouchApp

Builder.load_string('''
<RootLayout>:
    orientation: 'horizontal'

    shipPath: []

    ScatterLayout:
        auto_bring_to_front: False
        Image:
            id: blabla
            size_hint: (1.0,1.0)
            source: "myocean3.png"

            canvas.after:
                Line:
                    points: root.shipPath

    BoxLayout:
        size_hint: (0.25, 1.0)
        orientation: 'vertical'
        canvas.before:
            Color:
                rgb: .0, .0, .0
            Rectangle:
                pos: self.pos
                size: self.size

        padding: 20
        spacing: 20
        Button:
            text: 'Ship Route'
            on_press: root.setShipPath()
        Button:
            text: 'button2'
        Button:
            text: 'button3'
        Button:
            text: 'button4'
''')

class RootLayout(BoxLayout):
    shipPath = []

    def setShipPath(self):
        self.shipPath = [100, 100, 200, 300, 400, 600]
        print self.shipPath


runTouchApp(RootLayout())