Double Pendulum implementation in Python, now with added pendulums and trails :D

Last update: Dec 14, 2022

Overview

Double Pendulum Using Curses in Python.

A nice relaxing double pendulum simulation using ASCII, able to simulate multiple pendulums at once, and provide tracing of pendulums as well as providing some system information. If you spot any bugs or features that need adding (especially with the specs), just open an issue :)

Features

As mentioned, able to simulate multiple pendulums at once.
Able to specify the weight and mass of pendulums to create different butterfly effects.
Uses equations from here.
If -s is used, it grabs system specs and displays them.(hi r/unixporn)
Obviously a lot could be done to it (see below the Args), Any contributions are appreciated)

Quickstart:

Dependencies: Python 3.2+,curses (standard on UNIX) or relevent windows port, psutils if you want to use -s

Github

Clone using https://github.com/Nekurone/double-pendulum-ascii.git or download the zip.
Extract if necessary and head inside the folder.
python3 pendulum.py [args]

Pip

python3 -m pip install double-pendulum (or pip install double-pendulum)
double-pendulum [args]

Args

Visuals

help (-h)
trace (-t)
tracedrop (-tD)
specs (-s)

Maths and Pendulum settings

pendulum (-p)
speed (-sP)
gravity (-g)
mass (-m)
length (-l)

Window settings

HEIGHT (-H)
WIDTH (-W)
dHEIGHT (-dH)
dWIDTH (-dW)

Visuals

--help (-h)

Spits out a fairly standard argparse help message. Note this is printed out when the program is run anyway.

type: None, default: None setting in example: -h

--trace (-t)

Enables 'tracing', a faint line behind the pendulums that fades.

type: bool, default: off, setting in example: -t

--traceDrop (-tD)

Controls the rate at which the trace from -t fades. Higher is faster fading.

type: float, default: 1.0, setting in example: -t -tD 0.5

--specs (-t)

Enables showing system info, note this feature is still a WIP, any bugs or issues just let me know.

type: bool, default: off, setting in example: -s

Maths and Pendulum Settings

--pendulum (-p)

Number of pendulums to simulate at once. Combine with the gravity settings and some speed settings for some really pretty visuals.

type: int, default: 1, setting in example: -p 300

--speed (-sP)

Multiplier for speed of simulation. Around 0.5-1.5 is a good range

type: float, default: 1.0, setting in example: -sP 3.0

--gravity(-g)

Controls the strength of gravity, note, this directly affects the speed of the simulation. So slowing down is recommended.

type: float, default: 9.81, setting in example: -g 1

--mass (-m)

Controls the mass of the pendulums, useful mostly for butterfly effects

type: float, default: 100.0, setting in example: -m 300 -sP 0.2

--length (-l)

Controls the length of the arms of the pendulums, useful mostly for butterfly effects

type: float, default: 250.0, setting in example: -l 150 -sP 0.3

todo: Window settings

If you have any suggestions, or anything you'd like to add (or, more likely you found a bug) just open a PR :)

Comments

Add WM feature

I use i3wm, and it seems that theres only a DE function, which returns Generic Mabye change the line to WM/DE: or make a seperate line stating the wm currently running

opened by Rstar284 2
Remove title() on info values

in pendulum.py we have stdscr.addstr(i+3,(len(x)+1),': {0}'.format(sys_specs[x].title())) on line 330, this has proved unpopular and will be changed to stdscr.addstr(i+3,(len(x)+1),': {0}'.format(sys_specs[x]))

opened by Nekurone 0
Username not showing up

When i was observing your code, i saw a function get_user(), and it seems its not being used anywhere in the code, thus not showing the {username}@{hostname} line

opened by Rstar284 0
Clean up variable names.

Speaks for itself, variables are mostly 1 letter temp variables right now and all over the show. Implementing them with actual, readable names would improve readability.
good first issue

opened by Nekurone 0
Move drawing functions to new file

Improving readability is a big part of this project, as ideally I'd like it to become a reference for some of the more jank solutions when working with curses, moving the draw functions out of pendulum.py would improve that
enhancement

opened by Nekurone 0
Add more variables to the parser

Variables such as epsilon, both masses and both length rather than them being equal to mass and length respectively,

Would allow more functionality for chaos effects without code editing.
good first issue

opened by Nekurone 0