#!/usr/bin/python3
# ====================================================================
# sine and cosine test
# (play with + and - angles, and angles greater than 360)
# ====================================================================

import numpy as np
import user_interface as ui


diagram = '''
+-----------------------------------------------------+
|                 +                   +y              | 
|               ..|                    |              |
|             ..  |                    |              |
|           ..    |             -x,+y  |  +x,+y       |
|         ..      | sin                |              | 
|       ..        | (y)    -x ---------+--------- +x  |
|     ..          |                    |              |
|   ..            |             -x,-y  |  +x,-y       |
|  +..............+                    |              |
|        cos                           |              |
|        (x)                          -y              |
+-----------------------------------------------------+'''


# --------------------------------------------------------------------
# ---- display sine and cosine
# --------------------------------------------------------------------

def sin_cos(deg):
    asin = np.sin(np.deg2rad(deg))
    acos = np.cos(np.deg2rad(deg))
    return (asin,acos)


# --------------------------------------------------------------------
# ---- main
# --------------------------------------------------------------------

print(diagram)
    
while True:

    print()
    sdeg = ui.get_user_input('Enter angle (degrees): ')
    if not sdeg: break

    if sdeg[0] == '*' or sdeg[0].lower() == 'd':
        print(diagram)
        continue

    ##if sdeg[0].lower() == 'c':       # may not work
    ##    ui.clear_screen()            # depends on the terminal
    ##    continue

    tf,deg = ui.is_float(sdeg)
    if not tf:
        print()
        print(f'bad angle {sdeg}')
        continue

    # ---- display degrees, sine, cosine

    asin,acos =  sin_cos(deg)
    print()    
    print(f'{deg:>+7.2f}  sin = {asin:.4f}')
    print(f'{deg:>+7.2f}  cos = {acos:.4f}')