animate destination needle

flockompass.kv

@@ -81,8 +81,8 @@
                 canvas.after:
                     PopMatrix
             Image:
-                id: to_flock
-                source: 'needle_to_flock.png'
+                id: to_dest
+                source: 'needle_to_dest.png'
                 canvas.before:
                     PushMatrix
                     Rotate:

main.py

@@ -75,22 +75,9 @@ class FlockompassApp(App):
             self.ms.ids.mapview.center_on(self.session_data['dest_lat'],
                                           self.session_data['dest_lon'])
         else:
-            lat1 = self.gps_data['lat']
-            lon1 = self.gps_data['lon']
-
-            lat2 = self.session_data['dest_lat']
-            lon2 = self.session_data['dest_lon']
-
-            self.fbearing = atan2(sin(lon2 - lon1) * cos(lat2),
-                                  cos(lat1) * sin(lat2)
-                                  - sin(lat1) * cos(lat2) * cos(lon2-lon1))
-            self.fbearing = self.needle_angle - degrees(self.fbearing)
-            self.fbearing = (self.fbearing + 360) % 360
-
             self.dest_distance = "D: %0.1f km" % geodesic(
                 (self.gps_data['lat'], self.gps_data['lon']),
                 (self.session_data['dest_lat'], self.session_data['dest_lon'])).kilometers
-            print(self.dest_distance)
             
     def center_map_on_gps(self):
         self.ms.ids.mapview.center_on(self.gps_data['lat'],
@@ -106,7 +93,7 @@ class FlockompassApp(App):
         if self.cs.facade.field != (None, None, None):
             x, y, z = self.cs.facade.field
             
-            smoothingFactor = 0.5
+            smoothingFactor = 0.88
             angle = atan2(y, x)
             self.last_angle = smoothingFactor * self.last_angle  + (1 - smoothingFactor) * angle
 
@@ -124,8 +111,26 @@ class FlockompassApp(App):
         if self.cs._anim:
             self.cs._anim.stop(self)
         self.cs._anim = Animation(needle_angle=needle_angle,
-                                  d=0.2,
+                                  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):
@@ -170,7 +175,8 @@ class FlockompassApp(App):
 
         self.cs = CompassScreen(name='compass')
         self.cs._anim = None
-        self.cs.p = None
+        self.cs._anim1 = None        
+
         screen_manager.add_widget(self.cs)
 
         # smoothing vars for compass