webgl-stuff

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Circular set of points, that can change it's behaviour dynamically:

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# Webgl stuff  <a href="https://vchirkov.github.io/webgl-stuff" target="_blank">(demo)</a>

Circular set of points, that can change it's behaviour dynamically.

* WebglStuff [source](./src/index.js)

Whole thing consists of:
* Floating points [source](./src/circularPoints/circularPoints.js)
* Highlight [source](./src/lightRing/lightRing.js)
* Noise background [source](./src/floats/floats.js)

## Installation
```
npm install webgl-stuff --save
```

## Usage
ES6 import:
```javascript
import WebglStuff from 'webgl-stuff';

const wgs = new WebglStuff(document.getElementById('container'));
wgs.transitTo(preset, duration);
```
RequireJS:
```javascript
const wgs = require('webgl-stuff')(document.getElementById('container'));

wgs.transitTo(preset, duration);
```
Usage with async/await:
```javascript
const wgs = new WebglStuff(document.getElementById('container'));

(async () => {
    await timeout(5000);
    await wgs.transitTo(WebglStuff.presets.progress.bad, 3000);
    await timeout(5000);
    await wgs.transitTo(WebglStuff.presets.progress.normal, 5000);
})();

function timeout(dur) {
    return new Promise((res) => setTimeout(res, dur));
}
```

### Constructor Arguments
```javascript
/**
 * @class WebglStuff
 * @extends EventEmitter
 * @classdesc Class, that organizes CircularPoints, Floats and LightRing in one system
 */
export default class WebglStuff extends EventEmitter {
    /**
     * @constructor
     * @param {HTMLElement} el - Container element for scene <canvas/>
     * @param {Object} [initial = constants.initial] - params, that won't change through time
     * @param {Object} [preset = constants.neutral1] - params, that can be changed
     */
    constructor(el, initial = constants.initial, preset = constants.neutral1) {
        // ...
    }
    //...
```

* **el**  
  Any `<div/>` with reasonable size should work.  
  **!As calculation is executed per pixel, big elements can cause lags!**
* **initial**  
  Set of initial, unchangeable props
    * **x: 0** - position by `x` axis
    * **y: 0** - position by `y` axis
    * **z: 0** - position by `z` axis
    * **circles: 45** - number of particle circles
    * **r: 50** - inner radius of ring set (radius of the smallest particle ring)
    * **ringInside: 0.1** - inner radius of highlight circle
    * **ringOutside: 1.5** - outer radius of highlight circle
    * **space: 1** - distance between circles (biggest particle circle will have `radius = r + space * circles`)
    * **points: 100** - number of points for smallest circle
    * **diffusion: 0.5** - reduction of points based on ring index (`pointsNumber = points - diffusion * ringIndex`)
    * **floatsColor: new Color(0x000000)** - color of background noise (*to avoid dirty blending better use either #000 or #fff*).
* **preset**  
  Set of props, that can mutate through time
    * **visible: 10** - how many circles are visible right now
    * **opacityStep: 0.125** - how much should opacity change with each frame according to *visible* prop
    * **pointsColor: new Color(1, 1, 1)** - color of circular points
    * **ringColor: new Color(1, 1, 1)** - color of highlight ring
    * **opacity: 0.1** - opacity of highlight ring
    * **impact: 0.04** - how big is the *rattling* of rings
    * **stabilityStart: 1.05** - how big is the amplitude for inner circle
    * **stabilityEnd: 0.95** - how big is the amplitude for outer circle
    * **rotation: 0.0005** - rotation speed for circles 
    * **perlin: 0.00025** - perlin noise seed offset (don't think about it too much, just play around)
    * **background: new Color(0.295, 0.295, 0.78)** - background color
    * **floatsOpacity: 0.6** - opacity of noise background

## Methods
### transitTo()
```javascript
// ...
await wgs.transitTo(preset, duration);
// ...
```
* **preset** - full or partial set of changeable props
  ```javascript
  // ...
  // transition to "normal" preset
  await wgs.transitTo(WebglStuff.presets.progress.normal, duration);
  // ...
  ```
  ```javascript
  // ...
  // only change number of visible circles
  await wgs.transitTo({visible: 10}, duration);
  // ...
  ```
* **duration** - duration of transition in ms.
  ```javascript
  // ...
  // transition will take one second
  await wgs.transitTo(preset, 1000);
  // ...
  ```
### stopTransition()
Interrupt current transition.
Will **reject** promise from transitTo, that is in progress 
```javascript
// ...
// interrupt current transition
wgs.stopTransition();
// ...
```
### endTransition()
Finish current transition.
Will **resolve** promise from transitTo, that is in progress 
```javascript
// ...
// finish current transition
wgs.endTransition();
// ...
```
## Events
Events available:
* **WebglStuff.ON_TRANSITION_START** - emits, when all transition parameters are ready, but no transition update was applied
* **WebglStuff.ON_TRANSITION_PROGRESS** - emits on evety transition tick
* **WebglStuff.ON_TRANSITION_STOP** - emits, when transition was stopped
* **WebglStuff.ON_TRANSITION_END** - emits, when transition was ended manually or after transition reached end state
* **WebglStuff.ON_BEFORE_UPDATE** - emits, before any updates
* **WebglStuff.ON_UPDATE** - emits, when transition params have been updated, but no changes were applied to the objects
* **WebglStuff.ON_AFTER_UPDATE** - emits, when changes were applied to the objects

Example:
```javascript
wgs.on(WebglStuff.ON_UPDATE, () => console.log(Date.now()));
```

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