'''
Mission 11 - Spirit Level
After Obj. 6 - two functions
'''
from codex import *
from time import sleep
import math

def get_degrees(tilt):
    scaled = (tilt/16384)
    scaled = min(max(scaled, -1), 1)
    degrees = math.asin(scaled) * 180 / math.pi
    degrees = int(degrees)
    return degrees

def background():
    display.fill(WHITE)
    # grid for x
    display.draw_line(CENTER, 0, CENTER, 105, BLACK)
    display.draw_line(CENTER, 135, CENTER, 239, BLACK)

# -- Main Program --    
CENTER = 120
x = CENTER
background()

while True:
    val = accel.read()
    degrees = get_degrees(val[0])

    display.draw_circle(x, CENTER, 15, WHITE)
    x = CENTER + degrees
    display.draw_circle(x, CENTER, 15, ORANGE)
    sleep(0.2)

    if buttons.was_pressed(BTN_A):
        display.clear()
        break