Tiny improvements

clock.py

@@ -128,24 +128,23 @@ class MyClockWidget(FloatLayout):
 
         if self.set_alarm_mode or self.alarm_activated:
             source = 'alarm_on.png'
-            r = 0.9
-            g = 0.0
-            b = 0.0
+            rgb = [0.9, 0.0, 0.0]
         else:
             source = 'alarm_off.png'
-            r = 1.0
-            g = 1.0
-            b = 1.0
+            rgb = [1.0, 1.0, 1.0]
 
         set_alarm_button = self.ids["set_alarm_button"]
         set_alarm_button.canvas.clear()
         with set_alarm_button.canvas:
-            Color(r, g, b)
+            Color(rgb[0], rgb[1], rgb[2])
             Rectangle(size=set_alarm_button.size, pos=set_alarm_button.pos, source=source)
 
     def sun_rise(self):
         # to do: calculate brightness and color according to sun rise instead of linear increment
-        intensity = round((1.0 - self.seconds_to_next_alarm / (30.0 * 60.0)) * 256.0)
+        intensity = math.floor((1.0 - self.seconds_to_next_alarm / (1.0 * 60.0)) * 256.0)
+        if intensity < 0:
+            intensity = 0
+
         led_color = [0, 0, 0]
         for i in range(3):
             led_color[i] = intensity