'''
Mission 11 - Spirit Level
Extensions and Challenges
With functions and parameters
'''


from codex import *
from time import sleep


# Global Variables
CENTER = 120
x = CENTER
y = CENTER


# FUNCTIONS
def wait_button():
    display.print("Press A to start")
    while True:
        if buttons.was_pressed(BTN_A):
            break


def draw_centerlines():
    display.fill(BLACK)
    display.draw_line(CENTER, 0, CENTER, 105,WHITE)
    display.draw_line(CENTER, 135, CENTER, 239, WHITE)
    display.draw_line(0, CENTER, 105, CENTER, WHITE)
    display.draw_line(135, CENTER, 239, CENTER, WHITE)  


def get_degrees(tilt):
    scaled = (tilt/16384) * 90
    degrees = int(scaled)
    if degrees < -90:
        degrees = -90
    if degrees > 90:
        degrees = 90
    return degrees 


# MAIN PROGRAM
draw_centerlines()
wait_button()


while True:
    val = accel.read()
    degrees_x = get_degrees(val[0])
    degrees_y = get_degrees(val[1])


    if degrees_x < 0.020 and degrees_x > -0.020 and degrees_y < 0.020 and degrees_y > -0.020:
        display.fill_rect(105, 105, 30, 30, YELLOW)
    else:
        draw_centerlines()
        x = CENTER + degrees_x
        y = CENTER + degrees_y
        display.draw_circle(x, y, 15, ORANGE)
    
    sleep(0.5)
    
    if buttons.was_pressed(BTN_B):
        break


display.fill(BLUE)
display.print("Program Stopped")