This is a simulation of gravitational attraction between lots of 'stars'.

The Barnes-Hut Algorithm is used to efficiently calculate the forces acting on each star.

Keyboard Shortcuts

• WASD or HJKL: Pan.
• Arrow Keys: Slow pan.
• =: Zoom in.
• -: Zoom out.
• 0: Zoom standard.
• Home: Return to original view.
• b: Toggle bounding box rendering.
• f: Toggle brute-force mode. Stars turn blue when this mode is active, and gravitational attraction is calculated for every single pair of stars. The Barnes-Hut grid is not updated.
• g: Toggle Barnes-Hut grid rendering.
• p: Pause/unpause simulation.
• t: Toggle star trail rendering.

Dependencies

• SDL 2.0.5