This is a little toy probject to create a gravity-like simulation in Common Lisp. It only looks a little bit like gravity, but isn't remotely accurate.
- LISPBUILDER-SDL (MIT)
- Bordeaux Threads (MIT)
- Alexandria (Public Domain)
To get this thing started put it somewhere Quicklisp can find it and execute the following in the REPL:
(ql:quickload :gravity)
(gravity:start)You can add new planets using the left mouse button. Drag to set the new planet's movement speed. You can set the size (and thereby the mass) of a planet by dragging the right mouse button. A preview of the new size and movement will be shown. Regardless of the movement speed set, the middle mouse button creates a planet with a movement speed of 0.
The following keybinds are available:
| Key | Result |
|---|---|
ESC |
Pause the game. |
q (when paused) |
Quit |
n |
Skip one frame ahead (Only really useful when paused) |
d |
Toggle clearing the screen every frame |
p |
Toggle drawing the planet preview |
r |
Reset the new planet movement speed to 0 |
c |
Remove all planets |
b |
Toggle bouncing at the screen's edge |
a |
Toggle planet auto-creation. (On every mouse move) |
Copyright (c) 2014 Joram Schrijver
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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