import Tkinter as tk

from grid import Grid

class Render(object):

	def __init__(self, title, width, height):

		self.title = title		

		self.width = width

		self.height = height

		self.root = tk.Tk(className=title, sync=1)

		self.canvas = tk.Canvas(width=self.width, height=self.height, bg="black")

		self.canvas.pack(expand=tk.YES, fill=tk.BOTH)

	def render(self, grid):

		offset = (self.width / 2, self.height / 2)

		size = 1

		cell_ids = []

		for pos in grid.cells.iterkeys():

			x = pos[0] + offset[0]

			y = pos[1] + offset[1]

			cell_id = self.canvas.create_rectangle(x, y, x+size, y+size, 

					fill="yellow", width=0)

			cell_ids.append(cell_id)

		self.root.update()

		for cell_id in cell_ids:

			self.canvas.delete(cell_id)

import sys

import time

import gridmarshal as marshal

import os, stat

def main():

	filename = sys.argv[1]

	print "rendering ", filename	

	render = Render("hope", 800, 800)

	mod_time = 0

	while True:

		current = os.stat(filename)[stat.ST_MTIME]

		if current > mod_time:

			mod_time = current

			print "updating render"

			try:

				grid = marshal.loadGrid(filename)

				render.render(grid)

			except IndexError, ValueError:

				print "loading error"

		time.sleep(1)

if __name__ == "__main__":

	main()