A python function to make rainbows with included example using BearLibTerminal

color.py

__author__='@pyredrid'

#Takes an angle from 0.0 to 1.0 (exclusive) and returns the
#corresponding color in ARGB from a color wheel with full alpha
def colorFromWheel(angle):
		#Ensure that angle is positive
		angle = abs(angle)
		#Ensure that angle is between 0.0 and 1.0(exclusive)
		#Uses repeating instead of clamping to
		#allow time.time() rainbow tomfoolery
		angle = angle%1.0
		
		if angle >= 0 and angle < 1/6:
			#Linear interpolation for ramping color
			t = (angle * 6.0) * 255.0
			#Ramp up green, maintain red
			r = 255
			g = t
			b = 0
		elif angle >= 1/6 and angle < 2/6:
			#Backwards linear interpolation for ramping color
			t = 255.0 + (((angle - 1/6) * 6.0) * -255.0)
			#Ramp down red, maintain green
			r = t
			g = 255
			b = 0
		elif angle >= 2/6 and angle < 3/6:
			#Linear interpolation for ramping color
			t = ((angle - 2/6) * 6.0) * 255.0
			#Ramp up blue, maintain green
			r = 0
			g = 255
			b = t
		elif angle >= 3/6 and angle < 4/6:
			#Backwards linear interpolation for ramping color
			t = 255.0 + (((angle - 3/6) * 6.0) * -255.0)
			#Ramp down green, maintain blue
			r = 0
			g = t
			b = 255
		elif angle >= 4/6 and angle < 5/6:
			#Linear interpolation for ramping color
			t = ((angle - 4/6) * 6.0) * 255.0
			#Ramp up red, maintain blue
			r = t
			g = 0
			b = 255
		elif angle >= 5/6 and angle < 1:
			#Backwards linear interpolation for ramping color
			t = 255.0 + (((angle - 5/6) * 6.0) * -255.0)
			#Ramp down blue, maintain red
			r = 255
			g = 0
			b = t
		#Bitwise operations to create the ARGB representation
		result = (255 << 24) | (int(r) << 16) | (int(g) << 8) | int(b)
		return result

input.py

__author__='@pyredrid'

import lib.PyBearLibTerminal as term

global keysPressed
global keysDown
global keysReleased
keysPressed = []
keysDown = []
keysReleased = []

#Poll all key events, should be called every frame
def poll():
	global keysPressed
	global keysDown
	global keysReleased
	keysDown = keysPressed
	keysPressed = []
	keysReleased = []
	while term.has_input():
		key = term.read()
		if key & term.TK_KEY_RELEASED == term.TK_KEY_RELEASED:
			keysReleased.append(key)
		else:
			keysPressed.append(key)

#Returns True iff the key is pressed down
def isKeyDown(key):
	global keysPressed
	global keysDown
	if key in keysDown:
		return True
	if key in keysPressed:
		return True
	return False

#Returns True iff the key is not pressed down
def isKeyUp(key):
	global keysPressed
	global keysDown
	if key in keysDown:
		return False
	if key in keysPressed:
		return False
	return True

#Returns True iff the key has just been pressed in the last poll
def isKeyPressed(key):
	global keysPressed
	if key in keysPressed:
		return True
	return False

#Returns True iff the key has just been released in the last poll
def isKeyReleased(key):
	global keysReleased
	if key in keysReleased:
		return True
	return False

main.py

__author__='@pyredrid'
#Should appear similar to this: http://i.imgur.com/rCM7pFL.gif
import input
import random
import time

import utils.color as colorUtil
import lib.PyBearLibTerminal as term

print('starting...')
term.open()
term.set('window: title="Rainbow Tests", size=64x21')

isRunning = True

while isRunning:
	input.poll()
	if input.isKeyDown(term.TK_CLOSE) == True:
		isRunning = False
	t = time.time()
	for x in range(0, 64):
		for y in range(0, 21):
			bg = colorUtil.colorFromWheel((x/64)+(y/21)+(t/2))
			fg = colorUtil.colorFromWheel((t/2)+0.5)
			term.bkcolor(bg)
			term.color(fg)
			term.put(x, y, random.choice('0123456789ABCDEF'))
	term.refresh()