Collisions for items in a list

[Idents]

Hi,
I am attempting to make a simple ideal gas simulation.
I have created particles in a list as such, where the user will input n:

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import random import math import turtle as tt no_particles=int(n) ball=[] for i in range(no_particles):     ball.append(tt.Turtle())     ball[i]= tt.Turtle()     ball[i].speed(0)     ball[i].shape("circle")     ball[i].color("White")     ball[i].penup()     ball[i].goto(((right_edge*random.random())-(right_edge/2)),(top_edge*random.random())-(top_edge/2))         ball[i].dx = random.random()*3         ball[i].dy = random.random()*3   However I am struggling to detect collisions of these particles, I have attempted using the code below   while True:     for i in range(no_particles):         ball[i].setx(ball[i].xcor() + ball[i].dx)         ball[i].sety(ball[i].ycor() + ball[i].dy)           if distance < 25:             collision_counter +=1             counter.clear()             counter.write("Collison counter: {}".format(collision_counter), align="left",                 font=("Courier", vhalf, "normal"))             ball[0].dx *= -1             ball[0].dy *= -1             ball[1].dy *= -1             ball[1].dx *= -1

However no collisions will be detected, does anyone have any thoughts on how I could achieve this?

Larz60+ write Apr-06-2021, 03:29 PM:
Please post all code, output and errors (it it's entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.

Fixed for you this time. Please use bbcode tags on future posts.

[deanhystad]

Please wrap code with Python tags to retain indenting.

I don't see where you calculate distance.

[Idents]

Please wrap code with Python tags to retain indenting.

I don't see where you calculate distance.

Sorry about the code, this is the whole lot,

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import random import math R=8.3145 V=float(input("What is the volume of your vessel in metres cubed?: ")) T=float(input("What is the temperature of the gas in Kelvin?: ")) P=float(input("What is the pressure of the gas in Pascals?: ")) n=(P*V)/(R*T)     #variaball vessel_height=V*30 vessel_width=V*40 import turtle as tt wn=tt.Screen()   wn.title("Ideal Gas Simulator") wn.bgcolor("Black") wn.setup(width=vessel_width, height=vessel_height)   wn.tracer(0)   #Create a vessel pen=tt.Turtle() pen.shape("square") pen.color("white") pen.speed(0) pen.penup() pen.hideturtle() pen.goto((-0.5*vessel_width)+(2*V),(-0.5*vessel_height)+(2*V)) pen.pendown() pen.setheading(0)   for i in range (2):     pen.forward(vessel_width-(4*V))     pen.left(90)     pen.forward(vessel_height-(4*V))     pen.left(90) v=int(V) pen.penup() pen.goto(0, (vessel_height/2)-(2*V)) pen.write("Simulation of an ideal gas", align="center",           font=("arial", v, "normal"))     #Screen size variables left_edge=(-0.5*vessel_width)+(2*V) right_edge=(0.5*vessel_width)-(2*V) top_edge=(0.5*vessel_height)-(2*V) bottom_edge=(-0.5*vessel_height)+(2*V)   #collison counter vhalf=int(v/2) collision_counter = 0 counter=tt.Turtle() counter.speed(0) counter.shape("square") counter.color("white") counter.penup() counter.hideturtle() counter.goto(left_edge, top_edge) counter.write("Collision counter: 0", align="left",            font=("arial", vhalf, "normal")) #mole counter moles=tt.Turtle() moles.speed(0) moles.shape("square") moles.color("white") moles.penup() moles.hideturtle() moles.goto(right_edge, top_edge) moles.write("Number of moles: {}".format(n), align="right",            font=("arial", vhalf, "normal"))   if n<2:     n=2       no_particles=int(n) ball=[] for i in range(no_particles):     ball.append(tt.Turtle())     ball[i]= tt.Turtle()     ball[i].speed(0)     ball[i].shape("circle")     ball[i].color("White")     ball[i].penup()     ball[i].goto(((right_edge*random.random())-(right_edge/2)),(top_edge*random.random())-(top_edge/2))     if T > 600:         ball[i].dx = random.random()*3         ball[i].dy = random.random()*3       elif T < 250:         ball[i].dx=random.random()*1         ball[i].dy=random.random()*1           else:         ball[i].dx = random.random()*2         ball[i].dy = random.random()*2   distance = math.sqrt((ball[0].xcor()*ball[0].xcor())+(ball[1].ycor()*ball[1].ycor()))               while True:     for i in range(no_particles):         ball[i].setx(ball[i].xcor() + ball[i].dx)         ball[i].sety(ball[i].ycor() + ball[i].dy)           if ball[i].ycor()> (top_edge-10):             collision_counter +=1             counter.clear()             counter.write("Collison counter: {}".format(collision_counter), align="left",                 font=("Courier", vhalf, "normal"))             ball[i].sety(top_edge-10)             ball[i].dy *= -1           if ball[i].ycor()< (bottom_edge+10):             collision_counter +=1             counter.clear()             counter.write("Collison counter: {}".format(collision_counter), align="left",                 font=("Courier", vhalf, "normal"))             ball[i].sety(bottom_edge+10)             ball[i].dy *= -1           if ball[i].xcor() > (right_edge-10):             collision_counter +=1             counter.clear()             counter.write("Collison counter: {}".format(collision_counter), align="left",                 font=("Courier", vhalf, "normal"))             ball[i].setx(right_edge-10)             ball[i].dx *= -1           if ball[i].xcor() < (left_edge+10):             collision_counter +=1             counter.clear()             counter.write("Collison counter: {}".format(collision_counter), align="left",                 font=("Courier", vhalf, "normal"))             ball[i].setx(left_edge+10)             ball[i].dx *= -1           if distance < 50:             collision_counter +=1             counter.clear()             counter.write("Collison counter: {}".format(collision_counter), align="left",                 font=("Courier", vhalf, "normal"))             ball[0].dx *= -1             ball[0].dy *= -1             ball[1].dy *= -1             ball[1].dx *= -1                       wn.update()

[deanhystad]

You need to calculate distance each time you move the particles.