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<code python>
import turtle
import random
import time
import threading
from Agent import Agent


p = 350 #pixels
agentenradius = 15

#draw the square for the  bouncing balls
turtle.pu()
turtle.speed(0)
turtle.goto(p+agentenradius/2,p+agentenradius/2)
turtle.pd()
turtle.setheading(0)
for i in range(4):
    turtle.rt(90)
    turtle.fd(2*p+agentenradius)


wn = turtle.Screen()
wn.setup(p*2+agentenradius,p*2+agentenradius)
wn.bgcolor("white") #Screen background color = white
wn.title("Agents Simulator")
wn.tracer(0) #stops the screen from updating


agents = []
for _ in range(50): #range(anzahl der agents)
    agents.append(Agent(_)) #create agents

id_counter = 0
moving_agents = 3 #jedes 3. Agent bekommt eine Geschwindigkeit
for agent in agents:
    agent.ball.shape("circle")
    agent.ball.shapesize(agentenradius/20,agentenradius/20) #Radius von circles ## turtle.shapesize(x,y) vergrößert/verkleinert den Shape x-mal in x Richtung und y-mal in y Richtung
    agent.ball.color("medium sea green")
    agent.ball.penup() #not draw a line
    agent.ball.speed(0) #Geschwindigkeitsänderung
    agent.ball.id = id_counter

    #random xcor and ycor for each ball
    x = random.randint(-p,p)
    y = random.randint(-p,p)
    agent.ball.goto(x,y)

    if id_counter % moving_agents == 0:
        #random ycor speed between -3 and 3, no 0
        agent.ball.dy = random.randint(-1,1)
        while agent.ball.dy == 0:
            agent.ball.dy = random.randint(-1,1)

        #random xcor speed between -3 and 3, no 0
        agent.ball.dx = random.randint(-1,1)
        while agent.ball.dx == 0:
            agent.ball.dx = random.randint(-1,1)
    else:
        agent.ball.dx = 0
        agent.ball.dy = 0

    id_counter += 1


agents[0].setContagious() #first ball will be colored red
agents[0].days = 801 # is past "infected"


while True:
    wn.update() #the movements are smoother

    for agent in agents:

        agent.ball.sety(agent.ball.ycor() + agent.ball.dy) #sets the balls ycor to (the current ycor plus the change in y)
        agent.ball.setx(agent.ball.xcor() + agent.ball.dx)

        #check for a bounce (floor or bottom collision)
        if agent.ball.ycor() < -p:
            agent.ball.sety(-p)
            agent.ball.dy *= -1
        if agent.ball.ycor() > p:
            agent.ball.sety(p)
            agent.ball.dy *= -1

        #check for a wall collision
        if agent.ball.xcor() < -p:
            agent.ball.setx(-p)
            agent.ball.dx *= -1
        if agent.ball.xcor() > p:
            agent.ball.setx(p)
            agent.ball.dx *= -1

    #check for collisions between the balls
    for i in range(0,len(agents)):
        for j in range(i+1, len(agents)):
            #check for a collision
            if agents[i].ball.distance(agents[j].ball) < agentenradius:


                #switch the behaviours of these two balls
                if agents[i].id % moving_agents == 0 and agents[j].id % moving_agents == 0:
                     agents[i].ball.dx , agents[j].ball.dx = agents[j].ball.dx, agents[i].ball.dx
                     agents[i].ball.dy , agents[j].ball.dy = agents[j].ball.dy, agents[i].ball.dy
                if agents[i].id % moving_agents == 0 and agents[j].id % moving_agents != 0:
                    agents[i].ball.dx *= -1
                    #agents[i].ball.dy *= -1
                if agents[j].id % moving_agents == 0 and agents[i].id % moving_agents != 0:
                    agents[j].ball.dx *= -1
                    #agents[j].ball.dy *= -1


                # 0.9 = Wahrscheinlichkeit einer Infektion, Inkubation und Ansteckung
                if (agents[i].isContagious() and agents[j].isSusceptible() and random.random() < 0.9):
                    agents[j].setInfected()


                if(agents[i].isSusceptible() and agents[j].isContagious() and random.random() < 0.9):
                    agents[i].setInfected()


    # Krankheitsdays hochzaehlen
    for k in range(0,len(agents)):
        if(agents[k].days > 0):
            agents[k].days += 1

            if agents[k].days == 800:
                agents[k].setContagious()
            elif agents[k].days == 2800:
                agents[k].setRecovered()


wn.mainloop()
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