Add RGB spheres animation

examples/rgb-spheres.py

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+def xmaslight():
+	# This is the code from my 
+
+	#NOTE THE LEDS ARE GRB COLOUR (NOT RGB)
+
+	# Here are the libraries I am currently using:
+	import time
+	#from sim import board
+	#from sim import neopixel
+	import board
+	import neopixel
+	import re
+	import math
+	import random
+
+	# You are welcome to add any of these:
+	# import numpy
+	# import scipy
+	# import sys
+
+	# If you want to have user changable values, they need to be entered from the command line
+	# so import sys sys and use sys.argv[0] etc
+	# some_value = int(sys.argv[0])
+
+	# IMPORT THE COORDINATES (please don't break this bit)
+
+	#coordfilename = "./coords.txt"
+	coordfilename = "Python/coords.txt"
+
+	fin = open(coordfilename,'r')
+	coords_raw = fin.readlines()
+
+	coords_bits = [i.split(",") for i in coords_raw]
+
+	coords = []
+
+	for slab in coords_bits:
+		new_coord = []
+		for i in slab:
+			new_coord.append(int(re.sub(r'[^-\d]','', i)))
+		coords.append(new_coord)
+
+	#set up the pixels (AKA 'LEDs')
+	PIXEL_COUNT = len(coords) # this should be 500
+
+	pixels = neopixel.NeoPixel(board.D18, PIXEL_COUNT, auto_write=False)
+
+
+	# YOU CAN EDIT FROM HERE DOWN
+
+	# Calculates the distance of 2 vectors
+	def vdist(v1: list, v2: list):
+		if len(v1) != len(v2):
+			return -1
+
+		result = 0
+		for i in range(len(v1)):
+			result += (v1[i] - v2[i]) ** 2
+		return math.sqrt(result)
+
+	# Find coordinate that maximizes the distance for a given sez of other coords
+	def find_furthest(points: list):
+		max_dist = 0
+		cur_pnt = points[0]
+		for coord in coords:
+			dist = math.inf
+			for p in points:
+				p_dist = vdist(p, coord)
+				if p_dist < dist:
+					dist = p_dist
+
+			if (dist > max_dist):
+				max_dist = dist
+				cur_pnt = coord
+		return cur_pnt
+
+
+	# init sphere origins.
+	# First sphere's origin is furthest from the coordinate system's origin
+	# Second sphere's origin is the LED with the greatest distance from the first sphere's origin
+	# Third sphere's origin is the LED where the distance for both other spheres is maximized.
+	sphere_origins = []
+	sphere_origins.append(find_furthest([[0, 0, 0]]))
+	sphere_origins.append(find_furthest(sphere_origins))
+	sphere_origins.append(find_furthest(sphere_origins))
+
+	# calculate maximum distance of any LED for each sphere's origin.
+	# Used to determine the max radius each sphere will ever receive
+	max_dists = [0, 0, 0]
+	for coord in coords:
+		for i in range(3):
+			dist = vdist(coord, sphere_origins[i])
+			if max_dists[i] < dist:
+				max_dists[i] = dist
+
+	# The rate in which each sphere enlargens. When negative, the sphere is currently shrinking.
+	increment_rates = [0, 0, 0]
+	# The radius of each sphere. Initial value is randomized
+	radii = [0, 0, 0]
+
+	# set initial increment rates and radii 
+	for i in range(3):
+		# Frames per cycle for current sphere
+		frames = i * 40 + 120
+		increment_rates[i] = max_dists[i] / frames
+
+		# Random start radius 
+		radii[i] = random.random() * frames * increment_rates[i]
+
+	# infinitly many frames. Wohoo.
+	while True:
+		for i in range(PIXEL_COUNT):
+
+			# calculate color for current pixel. Each rgb (grb) color value is 255 * dist / max_dist
+			color = [0, 0, 0]
+			for s in range(3):
+				dist = abs(vdist(sphere_origins[s], coords[i]) - radii[s])
+				color[s] = int(255 * (1 - dist / max_dists[s]) ** 3)
+
+			pixels[i] = color
+		pixels.show()
+		# calculate radii for next iteration.
+		for s in range(3):
+			# Switch from enlarging to shrinking and vice versa, as needed
+			new_radius = radii[s] + increment_rates[s]
+			if new_radius >= max_dists[s] or new_radius <= 0:
+				increment_rates[s] = -increment_rates[s]
+
+			radii[s] += increment_rates[s]
+	return 'DONE'
+
+# yes, I just put this at the bottom so it auto runs
+xmaslight()