Merge pull request #109 from adafruit/rainbowio

Update example to use rainbowio

Author: dhalbert

examples/circuitplayground_pixels_simpletest.py

@@ -3,28 +3,15 @@
 
 """This example lights up the NeoPixels with a rainbow swirl."""
 import time
+from rainbowio import colorwheel
 from adafruit_circuitplayground import cp
 
 
-def wheel(pos):
-    # Input a value 0 to 255 to get a color value.
-    # The colours are a transition r - g - b - back to r.
-    if (pos < 0) or (pos > 255):
-        return (0, 0, 0)
-    if pos < 85:
-        return (int(pos * 3), int(255 - (pos * 3)), 0)
-    if pos < 170:
-        pos -= 85
-        return (int(255 - pos * 3), 0, int(pos * 3))
-    pos -= 170
-    return (0, int(pos * 3), int(255 - pos * 3))
-
-
 def rainbow_cycle(wait):
     for j in range(255):
         for i in range(cp.pixels.n):
             idx = int((i * 256 / len(cp.pixels)) + j)
-            cp.pixels[i] = wheel(idx & 255)
+            cp.pixels[i] = colorwheel(idx & 255)
         cp.pixels.show()
         time.sleep(wait)