#Tk_pendulum.py ^ 7/10/22

# Tk_pendulum.py

from math import sin, cos, degrees, atan2, radians
from tkinter import *
from time import time

ww = 500
hh = 500
root = Tk()
root.title('Pendulum')
canvas = Canvas(width=ww, height=hh, background='#343434')
canvas.pack()

canvas.noMousePress = 1

r = 30
rPend = int(ww * 0.5 - r * 2)
gravity = 0.9995
mid = int(ww * 0.5)
penh = 50
velocity = 120
angle = 0
acc = 1.0
swing = 180


def xy2deg(
    x1,
    y1,
    x2,
    y2,
    ):
    return degrees(atan2(x2 - x1, y2 - y1)) % 360


def deg2xy(angle, r):
    a = radians(angle)
    return (sin(a) * r, cos(a) * r)


YVEL = 1 / 180.0


def y2vel(z=angle):
    return 180 - abs(180 - z)


def mouse(e):
    global velocity, acc, swing
    x = e.x
    y = e.y
    canvas.noMousePress = 0
    swing = 180
    velocity = y2vel(xy2deg(mid, penh, x, y))
    if 'ButtonRelease' in str(e):
        canvas.noMousePress = 1
    acc = abs(acc)
    if x < mid:
        acc *= -1
        velocity *= -1


canvas.bind('<Button-1>', mouse)
canvas.bind('<B1-Motion>', mouse)
canvas.bind('<ButtonRelease-1>', mouse)

while 1:
    endtime = time() + 0.01
    canvas.delete('pendulum')

    swing += acc
    swing %= 360

    if canvas.noMousePress:
        angle = cos(radians(swing)) * velocity * -1
    else:
        angle = velocity

    (ballX, ballY) = deg2xy(angle, rPend)
    velocity *= gravity

    canvas.create_line(
        mid,
        penh,
        mid + ballX,
        penh + ballY,
        width=5,
        fill='orange',
        tags='pendulum',
        )
    canvas.create_oval(
        mid + ballX - r,
        penh + ballY - r,
        mid + ballX + r,
        penh + ballY + r,
        fill='white',
        outline='orange',
        width=5,
        tags='pendulum',
        )
    canvas.update()
    while endtime > time():
        0
    print(velocity)