This is the command planets that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
planets - Gravitational simulation of planetary bodies
DESCRIPTION
Planets is a simple interactive program for playing with simulations of planetary systems.
It is great teaching tool for understanding how gravitation works on a planetary level.
The user interface is aimed at being simple enough for a fairly young kid can get some joy
of it. There's also a special kid-mode aimed at very young children which grabs the focus
and converts key banging into lots of random planets.
KEYBINDINGS
Universe definition
a Add Planet
j Place random orbital planet
r Place random planet
u Undo (undoes last planet insertion)
e Reset to empty universe
g Go Back (goes back to just after last planet insertion)
Mouse Click on a planet to delete it
Physics
b Toggle bounce (experimental)
Display control
Cursor keys
Panning
c, Space
Move display to center of mass
x Initiate center of mass tracking
= Zoom in
- Zoom out
p Toggle Pause
o Change all colors randomly
t Toggle Trace
d Double Trace Length
h Halve Trace Length
Mouse Drag a box around a set of planets to follow the center of mass of those planets
Program control
H Display help dialog
k Display option dialog
Ctrl-Shift-k
Toggle kid-mode. Kid mode locks the keyboard and mouse, so the only way to get out
is to toggle kid-mode again to get out.
l Load Universe After pressing l, press any other character to load the universe with
that name. Universes are stored in ~/.planets/ .
s Save Universe After pressing s, press any other character to save the universe with
that name. Universes are saved in ~/.planets/ .
q, Esc Quit
TECHNICAL DETAILS
Planets uses a fourth-order runge-kutta approximation for the simulation itself. Planet
bouncing is achieved by adding a repulsive force to planets at close quarters. Planets is
fairly flexible: you can change the gravitational constant, the time-slice of the
simulation, and even the exponent used in the gravitational law. Universes are saved in
the ~/.planets directory, and are simple human readable and editable files.
Use planets online using onworks.net services
