-
Notifications
You must be signed in to change notification settings - Fork 0
/
dotstar_fire.py
96 lines (82 loc) · 3.25 KB
/
dotstar_fire.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
import threading
import time
import random
DEBUG = False
COOLING_SPEED = 55
class FireThread(threading.Thread):
def __init__(self, strip, ready):
threading.Thread.__init__(self)
print "init"
# For every pixel, construct a heat vector with a magnitude and direction.
self.heat = [{'magnitude': 0, 'direction': 0} for i in range(strip.numPixels())]
self.strip = strip
self.ready = ready
def run(self):
try:
print "run"
self.ready.set()
while True:
self.propagate()
except Exception as e:
print "Exiting %s due to Error: %s"%(self.name,str(e))
def ignite(self, center):
# Ignite 2 'sparks' near the center going outward:
leftSpark, rightSpark = center, center + 1
# Round towards the center. That way, both pixels are always on-screen.
if (center > self.strip.numPixels() / 2):
leftSpark -= 1
rightSpark -= 1
self.heat[rightSpark]['magnitude'] = random.randint(175,255);
self.heat[rightSpark]['direction'] = 1;
self.heat[leftSpark]['magnitude'] = random.randint(175,255);
self.heat[leftSpark]['direction'] = -1;
print "Igniting right spark to %d and left to %d" % (self.heat[rightSpark]['magnitude'], self.heat[leftSpark]['magnitude'])
def propagate(self):
heat = self.heat
# Step 1. Cool down every cell a little
for h in heat:
cooldown = random.randint(0, ((COOLING_SPEED * 20) / self.strip.numPixels()) + 2);
if cooldown > h['magnitude']:
h['magnitude'] = 0;
else:
h['magnitude'] = h['magnitude'] - cooldown;
# Step 2. Heat from each cell drifts in the corresponding direction
rights = []
lefts = []
for i in range(len(heat)):
if heat[i]['direction'] == 1 and i < len(heat) - 1:
heat[i + 1]['magnitude'] = min(heat[i + 1]['magnitude'] + heat[i]['magnitude'], 255)
rights.append(i)
elif heat[i]['direction'] == -1 and i > 0:
heat[i - 1]['magnitude'] = min(heat[i - 1]['magnitude'] + heat[i]['magnitude'], 255)
lefts.append(i)
heat[i]['direction'] = 0
for r in rights:
if r < len(heat) - 1:
heat[r + 1]['direction'] = 1
for l in lefts:
if l > 0:
heat[l - 1]['direction'] -= 1
# Step 4. Convert heat to LED colors
for i in range(len(heat)):
self.setPixelHeatColor(i, heat[i]['magnitude']);
self.strip.show()
if DEBUG:
print [h['magnitude'] for h in self.heat]
time.sleep(1.0 / 50) # Pause 20 milliseconds (~50 fps)
def setPixelHeatColor(self, pixel, temperature):
# Scale 'heat' down from 0-255 to 0-191
t192 = int(round((temperature/255.0)*191))
# calculate ramp up from
heatramp = t192 & 0x3F # 0..63
heatramp <<= 2 # scale up to 0..252
# figure out which third of the spectrum we're in:
if t192 > 0x80: # hottest
self.strip.setPixelColor(pixel, self.strip.Color(255, 255, heatramp))
elif t192 > 0x40: # middle
self.strip.setPixelColor(pixel, self.strip.Color(255, heatramp, 0))
else: # coolest
if pixel == 17:
self.strip.setPixelColor(pixel, self.strip.Color(max(heatramp, 4), 4, 0))
else:
self.strip.setPixelColor(pixel, self.strip.Color(heatramp, 0, 0))