def fill_missing_colors(self):
"""
Generates any missing colors based on average saturation and value,
and the sum and difference of the default hue and average hue
difference (between adjacent colors).
"""
assert len(self) >= 2, "Need at least 2 colors in palette to continue"
hue_diff = self.get_average_difference_from_target("hue")
avg_saturation, avg_value = map(self.get_average_value, ("saturation", "value"))
colors = sorted(self.target.items(), key=lambda (name, rgb): rgb)
for index in range(len(colors)):
name, rgb = colors[index]
if name in self:
continue
default_color = Color(*rgb)
candidates = []
if (default_color.hue - hue_diff) >= 0:
candidates.append(Color.from_hsv([default_color.hue - hue_diff, avg_saturation, avg_value]))
if (default_color.hue + hue_diff) <= 360:
candidates.append(Color.from_hsv([default_color.hue + hue_diff, avg_saturation, avg_value]))
elif (default_color.hue + hue_diff) > 360:
print name, (default_color.hue - hue_diff) % 360
self[name] = map(lambda candidate: (candidate, default_color.distance(candidate)), candidates)
