Gravity Simulator
=================

Runs in a browser. Just serve `index.html` and associated `css` and `js`.

Uses `npm` for `eslint`.

Screenshots
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![Simulation of a small body orbiting a pair of larger ones](./gravity-simulator-2.png "Gravity Simulator Screenshot 2")

TODO
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- [ ] Parameter Slider (Invisible, mouse/touch drag)
- [ ] Selection Box
- [ ] Object List
- [ ] Object Detail
- [ ] Left Button Panning
- [ ] Middle Button Pause
- [ ] Grid
- [ ] Zoom Easing
- [ ] 2-touch Pan & Zoom
- [ ] Multi-touch Mass Create
- [ ] Camera Rotation
  - [ ] 2-touch Rotation
  - [ ] Spinning Frame
- [ ] Undo feature: 
  - [ ] Undo "Clear Traces" Action
  - [ ] Undo "Reset
- [ ] Time Control: Reverse Time
- [ ] Save to LocalStorage
- [ ] Lossy Rescaling To Widen Zoom (Handling overflow/underflow)
- [ ] Track farthest reaches, min/max in each dimension (x, y)
  - [ ] Enabling Zoom to Fit Traces
- [x] Compute Net Angular Momentum
- [ ] Display Net Angular Momentum