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Switch chase to double-buffered ring chase

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Made-with: Cursor
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jimmy
2026-03-06 01:00:25 +13:00
parent 5f457b3ae7
commit a0687cff57
2 changed files with 147 additions and 104 deletions
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37
pico/test/chase.py
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@@ -33,27 +33,28 @@ for ws in strips[:-1]:
cumulative_leds.append(cumulative_leds[-1] + ws.num_leds)
total_ring_leds = cumulative_leds[-1] + strips[-1].num_leds
# Chase: trail length (0 = single LED), color (R,G,B)
TRAIL_LEN = 8
CHASE_COLOR = (0, 255, 100) # cyan-green
# Chase: color1 n1 long, then color2 n2 long, stepping n3 pixels
COLOR1 = (255, 0, 0) # red
COLOR2 = (0, 0, 255) # blue
N1 = 24 # length of color1 segment
N2 = 24 # length of color2 segment
STEP = 1 # step size in pixels per frame
def make_chase_double(num_leds, cumulative_leds, total_ring_leds, color, trail_len=0):
"""Pregenerate strip double buffer: when head shows index b first, that pixel is at
distance (2*cumulative_leds - b) % total_ring_leds from chase head. GRB order."""
def make_chase_double(num_leds, cumulative_leds, total_ring_leds, color1, color2, n1, n2):
"""Pregenerate strip double buffer with repeating segments:
color1 for n1 pixels, then color2 for n2 pixels, around the full ring. GRB order."""
n = 2 * num_leds
buf = bytearray(n * 3)
pattern_len = n1 + n2
for b in range(n):
dist = (2 * cumulative_leds - b) % total_ring_leds
if dist == 0:
r, grn, b_ = color[0], color[1], color[2]
elif trail_len and 0 < dist <= trail_len:
fade = 1.0 - (dist / (trail_len + 1))
r = int(color[0] * fade)
grn = int(color[1] * fade)
b_ = int(color[2] * fade)
# Position of this pixel along the logical ring
pos = (2 * cumulative_leds - b) % total_ring_leds
seg_pos = pos % pattern_len
if seg_pos < n1:
r, grn, b_ = color1[0], color1[1], color1[2]
else:
r = grn = b_ = 0
r, grn, b_ = color2[0], color2[1], color2[2]
o = b * 3
buf[o] = grn
buf[o + 1] = r
@@ -63,7 +64,7 @@ def make_chase_double(num_leds, cumulative_leds, total_ring_leds, color, trail_l
# Pregenerate one double buffer per strip
chase_buffers = [
make_chase_double(ws.num_leds, cumulative_leds[i], total_ring_leds, CHASE_COLOR, TRAIL_LEN)
make_chase_double(ws.num_leds, cumulative_leds[i], total_ring_leds, COLOR1, COLOR2, N1, N2)
for i, ws in enumerate(strips)
]
@@ -74,5 +75,5 @@ while True:
strip_len = strip.num_leds * 3
head = (chase_pos + cumulative_leds[i]) * 3 % strip_len
strip.show(chase_buffers[i], head)
chase_pos = (chase_pos + 1) % total_ring_leds
time.sleep_ms(20)
chase_pos = (chase_pos + STEP) % total_ring_leds
time.sleep_ms(40)