Newtonian N-body simulator in Javascript/HTML5
This simulator includes two classes of objects, particles and bodies. While particles move the bodies may not. It uses leapfrog integration to calculate motion. Particles do also interact.
To improve accuracy at the cost of speed lower dt.
Click here for demo. In the spawns a large stationary object, you can then click and drag to add particles.
Here is the result of the above demo after some time.
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Here are two examples of binary orbits. In the first one one of the particles, the more massive one, starts at rest.
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Here the first particle starts with 10 times as much velocity.
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Another binary orbit here the more massive particle almost seems to be tracing a sinusoidal path.
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Released under GPL 3
Why is this so slow?
Speed can be increased at the cost of accuracy by increasing the value of dt.
How accurate is this?
It can be fairly accurate so long as the time interval is kept low compared to the forces. A good indication of accuracy is are there gaps appearing in the trajectories? If so accuracy has been degraded as dt is too large.
Can it's accuracy be improved?
Decreasing dt improves accuracy at the cost of speed.
How does this work?
Each tick the force between each particle and body is calculated. This information is used in leapfrog integration.
Can I use this?
I release this under GPL v3, up to date version maintained on GitHub (https://github.com/wolfmankurd/planetaria).