'''
Mission 11 - Spirit Level - Remix 2B - Medium
The remix challenge is to use both the x and y value for tilt. 
Lines will be vertical and horizontal.
'''
from codex import *
from time import sleep
import math
# center of display (240 x 240)
CENTER = 120

# draw two lines on the screen
# leave space in the middle for the circle 
display.fill(WHITE)
display.draw_line(0, CENTER, 105, CENTER, BLACK)
display.draw_line(135, CENTER, 239, CENTER, BLACK)
display.draw_line(CENTER, 0, CENTER, 105, BLUE)
display.draw_line(CENTER, 135, CENTER, 239, BLUE)

# define a variable to use for the circle's position
x = CENTER
y = CENTER

# start an infinite loop
while True:
    # read from the accelerometer and get x value
    val = accel.read()
    tilt_x = val[0]
    tilt_y = val[1]
    # change tilt_x reading to degrees
    scaled_x = (tilt_x / 16384)
    scaled_x = min(max(scaled_x, -1), 1)
    degrees_x = math.asin(scaled_x) * 180 / math.pi
    degrees_x = int(degrees_x)
    # change tilt_y reading to degrees
    scaled_y = (tilt_y / 16384)
    scaled_y = min(max(scaled_y, -1), 1)
    degrees_y = math.asin(scaled_y) * 180 / math.pi
    degrees_y = int(degrees_y)
    # erase current circle, recalculate, and draw new circle
    display.draw_circle(x, y, 15, WHITE)
    x = CENTER + degrees_x
    y = CENTER + degrees_y
    display.draw_circle(x, y, 15, ORANGE)
    sleep(0.5)