flockompass/main.py

from plyer import gps
from kivy.app import App
from kivy.clock import Clock
from kivy.core.window import Window
from kivy.properties import DictProperty, NumericProperty, StringProperty
from kivy.clock import mainthread
from kivy.utils import platform
from kivy_garden.mapview import MapView
from kivy.uix.screenmanager import ScreenManager, Screen, RiseInTransition, SlideTransition
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.image import Image
from kivy.vector import Vector
from kivy.animation import Animation
from math import atan2, sin, cos, degrees, floor

from geopy.distance import geodesic

from os import path
import pickle

class IconButton(ButtonBehavior, Image):
    pass


class MapScreen(Screen):
    pass


class CompassScreen(Screen):
    def __init__(self, **kwargs):
        super(CompassScreen, self).__init__(**kwargs)
        Window.bind(on_keyboard=self.android_back_click)

    def android_back_click(self, window, key, *largs):
        if key == 27 and self.parent is not None:
            self.parent.current='map'
            return True



class SettingsScreen(Screen):
    def __init__(self, **kwargs):
        super(SettingsScreen, self).__init__(**kwargs)
        Window.bind(on_keyboard=self.android_back_click)

    def android_back_click(self, window, key, *largs):
        if key == 27 and self.parent is not None:
            self.parent.transition = SlideTransition(direction='left')
            self.parent.current='map'
            return True



class FlockompassApp(App):

    gps_data = DictProperty()
    session_data = DictProperty()
    needle_angle = NumericProperty(0)
    fbearing = NumericProperty(0)

    dest_distance = StringProperty("")
    dashboard_dest = StringProperty("")
    dashboard_flock = StringProperty("")

    theme = DictProperty(
        {'needle': "assets/needle_dark.png",
         'to_map': "assets/to_map_dark.png",
         'bgcolor': "#336645"})

    def dump(self, dt):
        print(dt, self.gps_data, self.session_data)

    def read_settings(self):
        app_folder = os.path.dirname(os.path.abspath(__file__))
        pickle_path = path.join(app_folder, 'settings.pickle')

        if path.isfile(pickle_path):
            with open(pickle_path, 'rb') as f:
                settings = pickle.load(f)
        else:
            settings = {'settings_smoothing': 0.88,
                        'settings_compass_update': 0.777
            }
            with open(pickle_path, 'wb') as f:
                pickle.dump(settings, f)

        self.session_data.update(settings)

    def save_settings(self):
        app_folder = os.path.dirname(os.path.abspath(__file__))
        pickle_path = path.join(app_folder, 'settings.pickle')

        settings = {k: self.session_data[k]
                    for k in self.session_data
                    if k.startswith('settings_')}

        with open(pickle_path, 'wb') as f:
            pickle.dump(settings, f)

    def set_smoothing(self):
        self.session_data['settings_smoothing'] = self.ss.ids.slider_smoothing.value
        self.save_settings()

    def set_compass_update(self):
        self.session_data['settings_compass_update'] = self.ss.ids.slider_compass_update.value
        self.compass_disable()
        self.compass_enable()
        self.save_settings()

    def set_destination(self):
        self.compass_enable()
        self.session_data['dest_lat'] = self.ms.ids.centermark.lat
        self.session_data['dest_lon'] = self.ms.ids.centermark.lon
        self.ms.ids.mapview.center_on(self.session_data['dest_lat'],
                                      self.session_data['dest_lon'])


    def set_dark_theme(self, active):
        if active:
            self.theme = {'needle': "assets/needle_dark.png",
                          'to_map': "assets/to_map_dark.png",
                          'bgcolor': "#336645"}
        else:
            self.theme = {'needle': "assets/needle_bright.png",
                          'to_map': "assets/to_map_bright.png",
                          'bgcolor': "#f3e8d2"}

    def request_android_permissions(self):
        from android.permissions import request_permissions, Permission

        def callback(permissions, results):
            if all([res for res in results]):
                print("All permissions granted.")
            else:
                print("Some permissions refused.", results)

        request_permissions([Permission.ACCESS_COARSE_LOCATION,
                             Permission.ACCESS_FINE_LOCATION],
                            callback)

    def gps_start(self, minTime, minDistance):
        gps.start(minTime, minDistance)

    def gps_stop(self):
        gps.stop()

    @mainthread
    def on_location(self, **kwargs):
        self.gps_data = kwargs
        self.dump(1)

        if ('dest_lat' not in self.session_data
            and
                'dest_lon' not in self.session_data):
            self.session_data['dest_lat'] = self.gps_data['lat']
            self.session_data['dest_lon'] = self.gps_data['lon']

            self.ms.ids.mapview.center_on(self.session_data['dest_lat'],
                                          self.session_data['dest_lon'])
        else:

            dest_distance = geodesic(
                (self.gps_data['lat'], self.gps_data['lon']),
                (self.session_data['dest_lat'], self.session_data['dest_lon'])).kilometers
            if dest_distance < 1:
                dest_distance *= 1000
                dest_distance = "%i metros" % dest_distance
            else:
                dest_distance = "%0.1f km" % dest_distance

            self.dest_distance = "Destino: %s\nVel: %0.1f km/h" % (dest_distance,
                                                                   self.gps_data['speed'])


    def center_map_on_gps(self):
        self.ms.ids.mapview.center_on(self.gps_data['lat'],
                                      self.gps_data['lon'])


    def get_field(self, dt):
        """
        get magnetic field for compass
        """

        needle_angle = 0
        if self.cs.facade.field != (None, None, None):
            x, y, z = self.cs.facade.field

            smoothingFactor = self.session_data.get('settings_smoothing', 0.88)
            angle = atan2(y, x)
            self.last_angle = smoothingFactor * self.last_angle  + (1 - smoothingFactor) * angle

            needle_angle = degrees(self.last_angle) - 90

        # fix animation transition around the unit circle
        if (self.needle_angle % 360) - needle_angle > 180:
            needle_angle += 360
        elif (self.needle_angle % 360) - needle_angle < -180:
            needle_angle -= 360
        # add the number of revolutions to the result
        needle_angle += 360 * floor(self.needle_angle / 360.)

        # animate the needle
        if self.cs._anim:
            self.cs._anim.stop(self)
        self.cs._anim = Animation(needle_angle=needle_angle,
                                  d=0.1,
                                  t='out_quad')

        lat1 = self.gps_data['lat']
        lon1 = self.gps_data['lon']

        lat2 = self.session_data['dest_lat']
        lon2 = self.session_data['dest_lon']

        fbearing = atan2(sin(lon2 - lon1) * cos(lat2),
                         cos(lat1) * sin(lat2)
                         - sin(lat1) * cos(lat2) * cos(lon2-lon1))
        fbearing = self.needle_angle - degrees(fbearing)

        #fbearing = (fbearing + 360) % 360

        self.cs._anim &= Animation(fbearing=fbearing,
                                  d=0.1,
                                  t='out_quad')

        self.cs._anim.start(self)

    def compass_enable(self):
        self.cs.facade.enable()
        Clock.schedule_interval(self.get_field,
                                1.0 - self.session_data.get('settings_compass_update', 0.777))

    def compass_disable(self):
        self.cs.facade.disable()
        Clock.unschedule(self.get_field)

    def on_pause(self):
        self.compass_disable()
        self.gps_stop()
        return True

    def on_resume(self):
        self.compass_enable()
        self.gps_start(1000, 0)

    def build(self):

        # start GPS
        try:
            gps.configure(on_location=self.on_location)

        except NotImplementedError:
            import traceback
            traceback.print_exc()
            print('GPS is not implemented for your platform')

        if platform == "android":
            self.request_android_permissions()

        self.gps_start(1000, 0)

        # setup app screens
        screen_manager = ScreenManager(transition=RiseInTransition())

        # map screen
        self.ms = MapScreen(name='map')
        screen_manager.add_widget(self.ms)

        # settings screen
        self.ss = SettingsScreen(name='settings')
        screen_manager.add_widget(self.ss)


        # compass screen

        # smoothing vars for compass
        self.last_angle = 0

        self.cs = CompassScreen(name='compass')
        self.cs._anim = None
        self.cs._anim1 = None
        screen_manager.add_widget(self.cs)

        #Clock.schedule_interval(self.dump, 2.0)

        return screen_manager


if __name__ == '__main__':
    app = FlockompassApp()
    app.read_settings()
    app.run()