#! /usr/bin/python3
# ===================================================================
# animation example #1
# ===================================================================

import user_interface as ui
import coordinate_conversion as cc
import draw_xy_axes as ax
import numpy as np
from graphics import *
import time


# ---- window dimensions

win_width  = 801
win_height = 801


# ------------------------------------------------------------------
# ---- animation
# ---- move a circle around the origin (center coordinates)
# ----
# ---- win  window object
# ---- dst  starting distance from origin (center coordinates)
# ---- deg  starting angle (degrees) for animation loop
# ---- inc  increment (in degrees) for each step of the loop
# ---- cnt  loop step count
# ---- sec  pause (seconds) between drawing frames
# -------------------------------------------------------------------

def animation(win, dst, deg, inc=5.0 ,cnt=100, sec=0.2):

    if not sec > 0.0:
        print(f'Bad seconds value ({sec})')
        return

    for _ in range(int(cnt)):

        rad = np.deg2rad(deg % 360.0)

        cx = np.sin(rad) * dst
        cy = np.cos(rad) * dst

        (wx,wy) = cc.center_to_win_coords(cx,cy,win.width,win.height)

        c = Circle(Point(wx,wy),5)
        c.setOutline('black')
        c.setWidth(2)
        c.setFill('red')
        c.draw(win)

        time.sleep(sec)

        c.undraw()

        deg += inc


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

# ---- create window

win = GraphWin("Animation 01", win_width, win_height)
win.setBackground("white")

# ---- draw X,Y coordinate axes

ax.draw_xy_axes(win,True)

# ---- animation

animation(win,150.0,0.0)

# ---- end program

ui.pause()

win.close()
print()