sim: fakes: Implement RGB <-> HSV color conversions

sim/fakes/leds.py

 from _sim import _sim
+from sys_colors import hsv_to_rgb
+from math import tau
 
 import pygame
 
@@ -30,11 +32,7 @@ def set_all_rgb(r, g, b):
 
 
 def set_hsv(ix, h, s, v):
-    color = pygame.Color(0)
-    h = int(h)
-    h = h % 360
-    color.hsva = (h, s * 100, v * 100, 1.0)
-    set_rgb(ix, color.r / 255, color.g / 255, color.b / 255)
+    set_rgb(ix, *hsv_to_rgb(h / 360 * tau, s, v))
 
 
 def set_slew_rate(b: int):

sim/fakes/sys_colors.py

-from colorsys import hsv_to_rgb, rgb_to_hsv
+from typing import Tuple
+import pygame
+from math import tau
+
+
+def hsv_to_rgb(h: float, s: float, v: float) -> Tuple[float, float, float]:
+    color = pygame.Color(0)
+    color.hsva = ((h % tau) / tau * 360, s * 100, v * 100, 100)
+    return color.normalize()[:3]
+
+
+def rgb_to_hsv(r: float, g: float, b: float) -> Tuple[float, float, float]:
+    color = pygame.Color(r, g, b)
+    h, s, v, a = color.hsva
+    return (h / 360 * tau, s / 100, v / 100)