This code simulates the trajectories of a number of bodies in space. A body can represent a star, planet, moon, asteroid,
or particle. Each body exerts gravity on all other bodies. The trajectories of each body are calculated using Newtonian gravity
and Euler's method. Due to the approximation of Euler's method, the simulation tends to have some error. This is especially apparent when time is sped up. 

There are many ways to interact with the program.
|-------------------------------------------------------------------------------------|
| Left Mouse Press - initiate launch sequence                                         |
| - Scroll Up - increase the mass of the body                                         |
| - Scroll Down - decrease the mass of the body                                       |
| Left Mouse Release - launch body from cursor toward where launch was initiated      |
|-------------------------------------------------------------------------------------|
| Right Mouse Press - spawn group of moons                                            |
|-------------------------------------------------------------------------------------|
| Scroll Up - speed up time                                                           |
|-------------------------------------------------------------------------------------|
| Scroll Down - slow down time                                                        |
|-------------------------------------------------------------------------------------|
| Spacebar - clear all bodies and trails                                              |
|-------------------------------------------------------------------------------------|
| p - pause the simulation                                                            |
|-------------------------------------------------------------------------------------|
| d - toggle center of gravity display                                                |
|-------------------------------------------------------------------------------------|
| t - toggle trails                                                                   |
|-------------------------------------------------------------------------------------|
| c - toggle center of gravity tracking                                               |
|-------------------------------------------------------------------------------------|
| Escape - end the simulation                                                         |
|-------------------------------------------------------------------------------------|

SFML and its dependencies are a pre-resquisuite to build this code. However, the executable file included
within the submission can be ran on x64 Windows computers without any having to install any libraries.
If using this method, add the argument "figure8" to run a pre-loaded simulation.

For example (Windows only):
> ./3body.exe --figure8