from Tkinter import *
from WalkingUnitsModel import walkingUnitsModel
import time

class walkingUnitsApp(Frame):
    """Creates a Frame for showing units moving along a path"""

    def __init__(self):
        """initializes frame"""
        Frame.__init__(self)
        self.master.title("Walking Units Simulator")
        self.config(width=600)
        self.config(height=500)
        self.master.resizable(0,0)
        self.grid()

        #self._dataModel = walkingUnitsModel()
        self._queueTotal = 0

        self._background = PhotoImage(file = 'BackGround.gif')
        self._backgroundLabel = Label(self, image = self._background)
        self._backgroundLabel.grid(column = 0, row = 0, rowspan = 3)

        self._enqueueButton = Button(self, text = "Queue a Unit", command = self._enqueue)
        self._enqueueButton.grid(column = 1, row = 0)

        self._dequeueButton = Button(self, text = "Start a Unit", command = self._dequeue)
        self._dequeueButton.grid(column = 1, row = 1)

        self._queueLabel = Label(self, text = "In Queue: " + str(self._queueTotal))
        self._queueLabel.grid(column = 1, row = 2)

        #self._countdown()

    def _enqueue(self):
        """queues a unit in to be set on the path"""
        #self._dataModel.makeUnit()
        self._queueTotal += 1

    def _dequeue(self):
        """sets a queued unit on the path"""
        #self._dataModel.startUnit()
        self._queueTotal -= 1

    def _countdown(self):
        """timer for redrawing units"""
        #while True:
            #self._draw()
            #time.sleep(1)

    def _draw(self):
        """redraws the units"""
        #self._dataModel.moveAll()


def main():
    walkingUnitsApp().mainloop()

if __name__ == "__main__":
    main()

from linkedlist import LinkedList
from coordinate import Coordinate
from linkedqueue import LinkedQueue
from unit import Unit
from images import Image

class walkingUnitsModel(object):
    def __init__(self):
        self._path = LinkedList()
        for i in range(500):
            self._path.add(Coordinate(i, i))
        self._movingUnits = LinkedList()
        self._queuedUnits = LinkedQueue()

    def makeUnit(self):
        self._queuedUnits.add(Unit(Image("unitsmall.gif"), self._path.head))

    def startUnit(self):
        self._movingUnits.add(self._queuedUnits.pop())

    def __step(self, unit):
        unit._position = unit._position.next
        if unit._position == None:
            self._movingUnits.remove(unit)

    def moveAll(self):
        for unit in self._movingUnits:
            self.__step(unit)