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<code Python>
#Bouncing Vall Simulator
import turtle
import random
import time
import threading
from erste_klasse import Agent

#ag1 = Agent()
#print(ag1)

p = 400 #pixels

#draw the square for the  bouncing balls
turtle.pu()
turtle.speed(0)
turtle.goto(p+10,p+10)
turtle.pd()
turtle.setheading(0)
for i in range(4):
    turtle.rt(90)
    turtle.fd(2*p+20)


wn = turtle.Screen()
wn.setup(p*2+20,p*2+20)
wn.bgcolor("white") #Screen background color = white
wn.title("Bouncing Ball Simulator")
wn.tracer(0) #stops the screen from updating


agents = []

for _ in range(50): #range(anzahl der bälle)
    agents.append(Agent(_)) #create balls


for agent in agents:
    agent.ball.shape("circle")
    agent.ball.color("green")
    agent.ball.penup() #not draw a line
    agent.ball.speed(1) #Geschwindigkeitsänderung

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

    #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)


agents[1].anstecken() #first ball will be colored red
infizierten =  [1] #numbers as the positions in the list of balls, which are colored red
recovered = []

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

    for agent in agents:
        #ball.rt(ball.da) #changing bouncing direction (sonst bleiben die zu zweit stecken)

        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
        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) < 20: # because each ball has 20 pixels width



                #switch the behaviours of these two balls
                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


                # 0.9 = Wahrscheinlichkeit einer Infektion

                if i in infizierten and j not in recovered and random.random()<0.9:
                    agents[j].anstecken()
                    if j not in infizierten:
                        infizierten.append(j)


                if j in infizierten and i not in recovered and random.random()<0.9:
                    agents[i].anstecken()
                    if i not in infizierten:
                        infizierten.append(i)

                for k in range(0,len(agents)):
                    if agents[k].tage >= 1 and agents[k].tage < 1000:
                        agents[k].tage += 1
                    if agents[k].tage == 1000:
                        agents[k].recovered()
                        recovered.append(k)
                        infizierten.remove(k)
wn.mainloop()

# To fix: they get stuck together, maybe because they have similar behaviurs and go to the direction of each other over and over


</code>
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