#!/usr/bin/python3
import curses
import time

from hilbertgenerator import Vector, hilbertgenerator

win = curses.initscr()
curses.curs_set(0)
n = 16
state = [ [0] * 2*n for x in  range(2*n) ]
lastpos = None
#            0123456789abcdef
linechars = "·─│┌──┐┬│└│├┘┴┤┼"
for pos in hilbertgenerator(Vector(n, n), Vector(n, 0), Vector(0,n)):
    if lastpos is not None:
        dir = pos - lastpos
        state[int(lastpos.y)][int(lastpos.x)] |= (
            (dir.x > 0) * 1 |
            (dir.y > 0) * 2 |
            (dir.x < 0) * 4 |
            (dir.y < 0) * 8
        )
        state[int(pos.y)][int(pos.x)] |= (
            (dir.x < 0) * 1 |
            (dir.y < 0) * 2 |
            (dir.x > 0) * 4 |
            (dir.y > 0) * 8
        )
        win.addch(int(lastpos.y), int(lastpos.x), linechars[state[int(lastpos.y)][int(lastpos.x)]])
        win.refresh()
        time.sleep(0.1)
        win.addch(int(pos.y), int(pos.x),
        linechars[state[int(pos.y)][int(pos.x)]])
        win.refresh()
        time.sleep(0.1)
    lastpos = pos
time.sleep(5)
curses.endwin()