# Tk_xy_degrees_and_distance.py

# Tk_xy_degrees_and_distance.py

from Tkinter import *
from PIL import ImageDraw, ImageTk, Image, ImageGrab
import math
import random

root = Tk()
root.title("Tk_xy_degrees_and_distance".replace('_',' '))
### root.withdraw() # vs root.deiconify()')
xx,yy = 600,600

canvas = Canvas(root, width=xx, height=yy)
canvas.grid()

mouse = [xx/2,yy/2]

def mmove(event):
    mouse[:] = [z*1.0 for z in (event.x,event.y)]
canvas.bind('<Motion>',mmove)

def dist(a,b):
    return (abs(a)**2+abs(b)**2)**0.5
def degrees(x1,y1,x2,y2):
    return (math.degrees(math.atan2((x2-x1),(y2-y1)*-1))+90)%360 if (y2-y1) else 0.0

while 1:
    canvas.delete('all')
    xm, ym = mouse
    deg = degrees(xx/2, yy/2, xm, ym)
    distance = dist(xx/2-xm, yy/2-ym)
    canvas.create_line(xx/2, yy/2, xm, ym, fill='blue')
    canvas.create_text(20, 20, anchor='nw', font='simsun 20', text='degrees: %f'%deg)
    canvas.create_text(20, 50, anchor='nw', font='simsun 20', text='distance: %f'%distance)
    t = 'x: %d y: %d +++(%d,%d)'%(xm, ym, xm-xx/2, ym-yy/2)
    canvas.create_text(20, 80, anchor='nw', font='simsun 20', text=t)
    canvas.update()