Make the animation demo more like the standard arduino chase demo

This shows a phase shifted chase animation on each strip, each in
a different color.

Author: jepler

examples/neopxl8_animations.py

@@ -2,17 +2,12 @@
 #
 # SPDX-License-Identifier: Unlicense
 
-# Set up a separate animation on each of 8 strips with NeoPxl8
-
 import board
-from adafruit_led_animation.animation.rainbow import Rainbow
+import rainbowio
+import adafruit_ticks
 from adafruit_led_animation.animation.comet import Comet
-from adafruit_led_animation.animation.rainbowcomet import RainbowComet
-from adafruit_led_animation.animation.rainbowchase import RainbowChase
-from adafruit_led_animation.animation.chase import Chase
 from adafruit_led_animation.group import AnimationGroup
 from adafruit_led_animation.helper import PixelMap
-from adafruit_led_animation import color
 from adafruit_neopxl8 import NeoPxl8
 
 # Customize for your strands here
@@ -28,30 +23,43 @@
     num_pixels,
     num_strands=num_strands,
     auto_write=False,
-    brightness=0.07,
+    brightness=0.50,
 )
 
 
-def strand(i):
+def strand(n):
     return PixelMap(
         pixels,
-        range(i * strand_length, (i + 1) * strand_length),
+        range(n * strand_length, (n + 1) * strand_length),
         individual_pixels=True,
     )
 
 
+# Create the 8 virtual strands
 strands = [strand(i) for i in range(num_strands)]
 
-animations = AnimationGroup(
-    Comet(strands[0], 0.5, color.CYAN),
-    Comet(strands[1], 0.4, color.AMBER),
-    RainbowComet(strands[2], 0.3),
-    RainbowComet(strands[3], 0.7),
-    Chase(strands[4], 0.05, size=2, spacing=3, color=color.PURPLE),
-    RainbowChase(strands[5], 0.05, size=2, spacing=3),
-    Rainbow(strands[6], 0.6),
-    Rainbow(strands[7], 0.23, step=21),
-)
+# For each strand, create a comet animation of a different color
+animations = [
+    Comet(strand, 0.02, rainbowio.colorwheel(3 * 32 * i), ring=True)
+    for i, strand in enumerate(strands)
+]
+
+# Advance the animations by varying amounts so that they become staggered
+for i, animation in enumerate(animations):
+    animation._tail_start = 30 * 5 * i // 8  # pylint: disable=protected-access
+
+# Group them so we can run them all at once
+animations = AnimationGroup(*animations)
 
+# Run the animations and report on the speed in frame per secodn
+t0 = adafruit_ticks.ticks_ms()
+frame_count = 0
 while True:
     animations.animate()
+    frame_count += 1
+    t1 = adafruit_ticks.ticks_ms()
+    dt = adafruit_ticks.ticks_diff(t1, t0)
+    if dt > 1000:
+        print(f"{frame_count * 1000/dt:.1f}fps")
+        t0 = t1
+        frame_count = 0