[Tutor] visualization

[Сергій]

Thanks for your remarks, Alan.
And " Law of Demeter" was something new and useful for me.
This is corrected code (I hope I've understand all your remarks right):



# -*- coding: windows-1251 -*-

import random, time, Tkinter

class Agent:
    def __init__ (self, x=100, y=100):
        self.name = random.randint(0, 100000)
        self.x = x
        self.y = y

    def __repr__ (self):
        return str(self.name)

    def step (self):
        old_x, old_y = self.x, self.y
        change_x, change_y = self.rand_vec()
        self.x, self.y = old_x + change_x, old_y + change_y

    def rand_vec(self):
        return random.randint(-5, 5), random.randint(-5, 5)

    def display(self, canvas):
        canvas.coords(self.ID, self.x, self.y)


class Environment:
    def __init__ (self):
        self.alive_agents = []

    def step(self):
        for obj in self.alive_agents:
            obj.step()

    def add_agent(self, agent):
#        print agent.name, ' was added to environment'
        self.alive_agents.append(agent)

    def show_env (self, canvas):
        for agent in env.alive_agents:
            agent.display(canvas)


class GraphEnvironment(Tkinter.Frame):

    def __init__ (self, root):

        self.root = root
        self.background = Tkinter.Canvas(self.root, width=200, height=200,
background="white")

        for agent in env.alive_agents:
            agent.ID=self.background.create_image(100, 100, anchor=
Tkinter.NW, image=picture)

        self.background.pack(fill=Tkinter.BOTH,expand=Tkinter.YES)

        self.root.after(100,self.NextDay)

    def NextDay(self):
        env.step()
        env.show_env(self.background)
        self.root.after(50,self.NextDay)



print '\tBORN'

env = Environment()
for obj in range(100):
    child = Agent()
#    print child, ' was born'
    env.add_agent(child)

print '\tGRAPH LIFE'

root=Tkinter.Tk()
picture =Tkinter.PhotoImage(file="HolyGrail.gif")
GraphEnvironment(root)
root.mainloop()
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