Merge pull request #115 from tneish/horiz_animation

ColorCycle accepts start color

adafruit_led_animation/animation/colorcycle.py

@@ -38,12 +38,15 @@ class ColorCycle(Animation):
     :param float speed: Animation speed in seconds, e.g. ``0.1``.
     :param colors: A list of colors to cycle through in ``(r, g, b)`` tuple, or ``0x000000`` hex
                    format. Defaults to a rainbow color cycle.
+    :param start_color: An index (from 0) for which color to start from. Default 0 (first color).
     """
 
-    def __init__(self, pixel_object, speed, colors=RAINBOW, name=None):
+    # pylint: disable=too-many-arguments
+    def __init__(self, pixel_object, speed, colors=RAINBOW, name=None, start_color=0):
         self.colors = colors
-        super().__init__(pixel_object, speed, colors[0], name=name)
-        self._generator = self._color_generator()
+        self.start_color = start_color
+        super().__init__(pixel_object, speed, colors[start_color], name=name)
+        self._generator = self._color_generator(start_color)
         next(self._generator)
 
     on_cycle_complete_supported = True
@@ -52,17 +55,17 @@ def draw(self):
         self.pixel_object.fill(self.color)
         next(self._generator)
 
-    def _color_generator(self):
-        index = 0
+    def _color_generator(self, start_color):
+        index = start_color
         while True:
             self._color = self.colors[index]
             yield
             index = (index + 1) % len(self.colors)
-            if index == 0:
+            if index == start_color:
                 self.cycle_complete = True
 
     def reset(self):
         """
         Resets to the first color.
         """
-        self._generator = self._color_generator()
+        self._generator = self._color_generator(self.start_color)