nbody

This is a simulation of the n-body problem in physics. It is written in C and it uses the library Raylib for the GUI.

Quick Start

Install Raylib

• On Linux: https://github.com/raysan5/raylib/wiki/Working-on-GNU-Linux
• For Web: https://github.com/raysan5/raylib/wiki/Working-for-Web-(HTML5)

Clone repo

$ git clone https://github.com/pedropesserl/nbody.git

Compile

Compilation options: nbody (default), web, all (both)

$ make [compilation_option]

Usage

• $ ./nbody - Make an empty space and fill it with bodies by clicking the screen.

• $ ./nbody -n <number_of_bodies> - Pre-fill the space with bodies by writing the data about them in stdin: mass, density, position (x), position (y), velocity (x), velocity (y).

Note: Mass and density must be greater than zero. The radius of each body is calculated as the cube root of its volume (mass/density), to emulate the square-cube law.

Controls

• Mouse Left: add planet
• Mouse Right (drag): move through space
• Mouse Wheel: zoom
• ␣ Play/pause simulation
• a Toggle arrows
• t Toggle trails
• ← Rewind
• → Fast forward

Sources

• https://www.raylib.com/examples.html
• https://en.wikipedia.org/wiki/Elastic_collision#Two-dimensional
• https://youtube.com/@TsodingDaily